1 files changed, 2175 insertions, 0 deletions

diff --git a/lib/sqlite/lsqlite3.c b/lib/sqlite/lsqlite3.c
new file mode 100644
index 000000000..cf2c62597
--- /dev/null
+++ b/lib/sqlite/lsqlite3.c
@@ -0,0 +1,2175 @@
+/************************************************************************
+* lsqlite3                                                              *
+* Copyright (C) 2002-2013 Tiago Dionizio, Doug Currie                   *
+* All rights reserved.                                                  *
+* Author    : Tiago Dionizio <tiago.dionizio@ist.utl.pt>                *
+* Author    : Doug Currie <doug.currie@alum.mit.edu>                    *
+* Library   : lsqlite3 - a SQLite 3 database binding for Lua 5          *
+*                                                                       *
+* Permission is hereby granted, free of charge, to any person obtaining *
+* a copy of this software and associated documentation files (the       *
+* "Software"), to deal in the Software without restriction, including   *
+* without limitation the rights to use, copy, modify, merge, publish,   *
+* distribute, sublicense, and/or sell copies of the Software, and to    *
+* permit persons to whom the Software is furnished to do so, subject to *
+* the following conditions:                                             *
+*                                                                       *
+* The above copyright notice and this permission notice shall be        *
+* included in all copies or substantial portions of the Software.       *
+*                                                                       *
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       *
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    *
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  *
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  *
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     *
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                *
+************************************************************************/
+// Slightly modified by _Xoft to compile in MSVC
+
+
+
+
+// 2013_04_07 _X: Added the following #define-s so that MSVC doesn't complain about non-secure stuff:
+#define _CRT_SECURE_NO_WARNINGS
+#ifdef __cplusplus
+extern "C" {
+#endif  // __cplusplus
+
+
+
+
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+
+#define LUA_LIB
+#include "lua/src/lua.h"
+#include "lua/src/lauxlib.h"
+
+#if LUA_VERSION_NUM > 501
+//
+// Lua 5.2
+//
+#define lua_strlen lua_rawlen
+// luaL_typerror always used with arg at ndx == NULL
+#define luaL_typerror(L,ndx,str) luaL_error(L,"bad argument %d (%s expected, got nil)",ndx,str)
+// luaL_register used once, so below expansion is OK for this case
+#define luaL_register(L,name,reg) lua_newtable(L);luaL_setfuncs(L,reg,0)
+// luaL_openlib always used with name == NULL
+#define luaL_openlib(L,name,reg,nup) luaL_setfuncs(L,reg,nup)
+#endif
+
+#include "sqlite3.h"
+
+/* compile time features */
+#if !defined(SQLITE_OMIT_PROGRESS_CALLBACK)
+    #define SQLITE_OMIT_PROGRESS_CALLBACK 0
+#endif
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK)
+    #define LSQLITE_OMIT_UPDATE_HOOK 0
+#endif
+
+typedef struct sdb sdb;
+typedef struct sdb_vm sdb_vm;
+typedef struct sdb_func sdb_func;
+
+/* to use as C user data so i know what function sqlite is calling */
+struct sdb_func {
+    /* references to associated lua values */
+    int fn_step;
+    int fn_finalize;
+    int udata;
+
+    sdb *db;
+    char aggregate;
+
+    sdb_func *next;
+};
+
+/* information about database */
+struct sdb {
+    /* associated lua state */
+    lua_State *L;
+    /* sqlite database handle */
+    sqlite3 *db;
+
+    /* sql functions stack usage */
+    sdb_func *func;         /* top SQL function being called */
+
+    /* references */
+    int busy_cb;        /* busy callback */
+    int busy_udata;
+
+    int progress_cb;    /* progress handler */
+    int progress_udata;
+
+    int trace_cb;       /* trace callback */
+    int trace_udata;
+
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK
+
+    int update_hook_cb; /* update_hook callback */
+    int update_hook_udata;
+
+    int commit_hook_cb; /* commit_hook callback */
+    int commit_hook_udata;
+
+    int rollback_hook_cb; /* rollback_hook callback */
+    int rollback_hook_udata;
+
+#endif
+};
+
+static const char *sqlite_meta      = ":sqlite3";
+static const char *sqlite_vm_meta   = ":sqlite3:vm";
+static const char *sqlite_ctx_meta  = ":sqlite3:ctx";
+static int sqlite_ctx_meta_ref;
+
+/*
+** =======================================================
+** Database Virtual Machine Operations
+** =======================================================
+*/
+
+static void vm_push_column(lua_State *L, sqlite3_stmt *vm, int idx) {
+    switch (sqlite3_column_type(vm, idx)) {
+        case SQLITE_INTEGER:
+            {
+                sqlite_int64 i64 = sqlite3_column_int64(vm, idx);
+                lua_Number n = (lua_Number)i64;
+                if (n == i64)
+                    lua_pushnumber(L, n);
+                else
+                    lua_pushlstring(L, (const char*)sqlite3_column_text(vm, idx), sqlite3_column_bytes(vm, idx));
+            }
+            break;
+        case SQLITE_FLOAT:
+            lua_pushnumber(L, sqlite3_column_double(vm, idx));
+            break;
+        case SQLITE_TEXT:
+            lua_pushlstring(L, (const char*)sqlite3_column_text(vm, idx), sqlite3_column_bytes(vm, idx));
+            break;
+        case SQLITE_BLOB:
+            lua_pushlstring(L, sqlite3_column_blob(vm, idx), sqlite3_column_bytes(vm, idx));
+            break;
+        case SQLITE_NULL:
+            lua_pushnil(L);
+            break;
+        default:
+            lua_pushnil(L);
+            break;
+    }
+}
+
+/* virtual machine information */
+struct sdb_vm {
+    sdb *db;                /* associated database handle */
+    sqlite3_stmt *vm;       /* virtual machine */
+
+    /* sqlite3_step info */
+    int columns;            /* number of columns in result */
+    char has_values;        /* true when step succeeds */
+
+    char temp;              /* temporary vm used in db:rows */
+};
+
+/* called with sql text on the lua stack */
+static sdb_vm *newvm(lua_State *L, sdb *db) {
+    sdb_vm *svm = (sdb_vm*)lua_newuserdata(L, sizeof(sdb_vm));
+
+    luaL_getmetatable(L, sqlite_vm_meta);
+    lua_setmetatable(L, -2);        /* set metatable */
+
+    svm->db = db;
+    svm->columns = 0;
+    svm->has_values = 0;
+    svm->vm = NULL;
+    svm->temp = 0;
+
+    /* add an entry on the database table: svm -> sql text */
+    lua_pushlightuserdata(L, db);
+    lua_rawget(L, LUA_REGISTRYINDEX);
+    lua_pushlightuserdata(L, svm);
+    lua_pushvalue(L, -4); /* the sql text */
+    lua_rawset(L, -3);
+    lua_pop(L, 1);
+
+    return svm;
+}
+
+static int cleanupvm(lua_State *L, sdb_vm *svm) {
+    /* remove entry in database table - no harm if not present in the table */
+    lua_pushlightuserdata(L, svm->db);
+    lua_rawget(L, LUA_REGISTRYINDEX);
+    lua_pushlightuserdata(L, svm);
+    lua_pushnil(L);
+    lua_rawset(L, -3);
+    lua_pop(L, 1);
+
+    svm->columns = 0;
+    svm->has_values = 0;
+
+    if (!svm->vm) return 0;
+
+    lua_pushnumber(L, sqlite3_finalize(svm->vm));
+    svm->vm = NULL;
+    return 1;
+}
+
+static int stepvm(lua_State *L, sdb_vm *svm) {
+    int result;
+    int loop_limit = 3;
+    while ( loop_limit-- ) {
+        result = sqlite3_step(svm->vm);
+        if ( result==SQLITE_ERROR ) {
+          result = sqlite3_reset (svm->vm);
+        }
+        if ( result==SQLITE_SCHEMA ) {
+            sqlite3_stmt *vn;
+            const char *sql;
+            /* recover sql text */
+            lua_pushlightuserdata(L, svm->db);
+            lua_rawget(L, LUA_REGISTRYINDEX);
+            lua_pushlightuserdata(L, svm);
+            lua_rawget(L, -2); /* sql text */
+            sql = luaL_checkstring(L, -1);
+            /* re-prepare */
+            result = sqlite3_prepare(svm->db->db, sql, -1, &vn, NULL);
+            if (result != SQLITE_OK) break;
+            sqlite3_transfer_bindings(svm->vm, vn);
+            sqlite3_finalize(svm->vm);
+            svm->vm = vn;
+            lua_pop(L,2);
+        } else {
+          break;
+        }
+    }
+    return result;
+}
+
+static sdb_vm *lsqlite_getvm(lua_State *L, int index) {
+    sdb_vm *svm = (sdb_vm*)luaL_checkudata(L, index, sqlite_vm_meta);
+    if (svm == NULL) luaL_argerror(L, index, "bad sqlite virtual machine");
+    return svm;
+}
+
+static sdb_vm *lsqlite_checkvm(lua_State *L, int index) {
+    sdb_vm *svm = lsqlite_getvm(L, index);
+    if (svm->vm == NULL) luaL_argerror(L, index, "attempt to use closed sqlite virtual machine");
+    return svm;
+}
+
+static int dbvm_isopen(lua_State *L) {
+    sdb_vm *svm = lsqlite_getvm(L, 1);
+    lua_pushboolean(L, svm->vm != NULL ? 1 : 0);
+    return 1;
+}
+
+static int dbvm_tostring(lua_State *L) {
+    char buff[39];
+    sdb_vm *svm = lsqlite_getvm(L, 1);
+    if (svm->vm == NULL)
+        strcpy(buff, "closed");
+    else
+        sprintf(buff, "%p", svm);
+    lua_pushfstring(L, "sqlite virtual machine (%s)", buff);
+    return 1;
+}
+
+static int dbvm_gc(lua_State *L) {
+    sdb_vm *svm = lsqlite_getvm(L, 1);
+    if (svm->vm != NULL)  /* ignore closed vms */
+        cleanupvm(L, svm);
+    return 0;
+}
+
+static int dbvm_step(lua_State *L) {
+    int result;
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+
+    result = stepvm(L, svm);
+    svm->has_values = result == SQLITE_ROW ? 1 : 0;
+    svm->columns = sqlite3_data_count(svm->vm);
+
+    lua_pushnumber(L, result);
+    return 1;
+}
+
+static int dbvm_finalize(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    return cleanupvm(L, svm);
+}
+
+static int dbvm_reset(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_reset(svm->vm);
+    lua_pushnumber(L, sqlite3_errcode(svm->db->db));
+    return 1;
+}
+
+static void dbvm_check_contents(lua_State *L, sdb_vm *svm) {
+    if (!svm->has_values) {
+        luaL_error(L, "misuse of function");
+    }
+}
+
+static void dbvm_check_index(lua_State *L, sdb_vm *svm, int index) {
+    if (index < 0 || index >= svm->columns) {
+        luaL_error(L, "index out of range [0..%d]", svm->columns - 1);
+    }
+}
+
+static void dbvm_check_bind_index(lua_State *L, sdb_vm *svm, int index) {
+    if (index < 1 || index > sqlite3_bind_parameter_count(svm->vm)) {
+        luaL_error(L, "bind index out of range [1..%d]", sqlite3_bind_parameter_count(svm->vm));
+    }
+}
+
+/*
+** =======================================================
+** Virtual Machine - generic info
+** =======================================================
+*/
+static int dbvm_columns(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    lua_pushnumber(L, sqlite3_column_count(svm->vm));
+    return 1;
+}
+
+/*
+** =======================================================
+** Virtual Machine - getters
+** =======================================================
+*/
+
+static int dbvm_get_value(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    int index = luaL_checkint(L, 2);
+    dbvm_check_contents(L, svm);
+    dbvm_check_index(L, svm, index);
+    vm_push_column(L, svm->vm, index);
+    return 1;
+}
+
+static int dbvm_get_name(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    int index = (int)luaL_checknumber(L, 2);
+    dbvm_check_index(L, svm, index);
+    lua_pushstring(L, sqlite3_column_name(svm->vm, index));
+    return 1;
+}
+
+static int dbvm_get_type(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    int index = (int)luaL_checknumber(L, 2);
+    dbvm_check_index(L, svm, index);
+    lua_pushstring(L, sqlite3_column_decltype(svm->vm, index));
+    return 1;
+}
+
+static int dbvm_get_values(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = svm->columns;
+    int n;
+    dbvm_check_contents(L, svm);
+
+    lua_newtable(L);
+    for (n = 0; n < columns;) {
+        vm_push_column(L, vm, n++);
+        lua_rawseti(L, -2, n);
+    }
+    return 1;
+}
+
+static int dbvm_get_names(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = sqlite3_column_count(vm); /* valid as soon as statement prepared */
+    int n;
+
+    lua_newtable(L);
+    for (n = 0; n < columns;) {
+        lua_pushstring(L, sqlite3_column_name(vm, n++));
+        lua_rawseti(L, -2, n);
+    }
+    return 1;
+}
+
+static int dbvm_get_types(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = sqlite3_column_count(vm); /* valid as soon as statement prepared */
+    int n;
+
+    lua_newtable(L);
+    for (n = 0; n < columns;) {
+        lua_pushstring(L, sqlite3_column_decltype(vm, n++));
+        lua_rawseti(L, -2, n);
+    }
+    return 1;
+}
+
+static int dbvm_get_uvalues(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = svm->columns;
+    int n;
+    dbvm_check_contents(L, svm);
+
+    lua_checkstack(L, columns);
+    for (n = 0; n < columns; ++n)
+        vm_push_column(L, vm, n);
+    return columns;
+}
+
+static int dbvm_get_unames(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = sqlite3_column_count(vm); /* valid as soon as statement prepared */
+    int n;
+
+    lua_checkstack(L, columns);
+    for (n = 0; n < columns; ++n)
+        lua_pushstring(L, sqlite3_column_name(vm, n));
+    return columns;
+}
+
+static int dbvm_get_utypes(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = sqlite3_column_count(vm); /* valid as soon as statement prepared */
+    int n;
+
+    lua_checkstack(L, columns);
+    for (n = 0; n < columns; ++n)
+        lua_pushstring(L, sqlite3_column_decltype(vm, n));
+    return columns;
+}
+
+static int dbvm_get_named_values(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = svm->columns;
+    int n;
+    dbvm_check_contents(L, svm);
+
+    lua_newtable(L);
+    for (n = 0; n < columns; ++n) {
+        lua_pushstring(L, sqlite3_column_name(vm, n));
+        vm_push_column(L, vm, n);
+        lua_rawset(L, -3);
+    }
+    return 1;
+}
+
+static int dbvm_get_named_types(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int columns = sqlite3_column_count(vm);
+    int n;
+
+    lua_newtable(L);
+    for (n = 0; n < columns; ++n) {
+        lua_pushstring(L, sqlite3_column_name(vm, n));
+        lua_pushstring(L, sqlite3_column_decltype(vm, n));
+        lua_rawset(L, -3);
+    }
+    return 1;
+}
+
+/*
+** =======================================================
+** Virtual Machine - Bind
+** =======================================================
+*/
+
+static int dbvm_bind_index(lua_State *L, sqlite3_stmt *vm, int index, int lindex) {
+    switch (lua_type(L, lindex)) {
+        case LUA_TSTRING:
+            return sqlite3_bind_text(vm, index, lua_tostring(L, lindex), lua_strlen(L, lindex), SQLITE_TRANSIENT);
+        case LUA_TNUMBER:
+            return sqlite3_bind_double(vm, index, lua_tonumber(L, lindex));
+        case LUA_TBOOLEAN:
+            return sqlite3_bind_int(vm, index, lua_toboolean(L, lindex) ? 1 : 0);
+        case LUA_TNONE:
+        case LUA_TNIL:
+            return sqlite3_bind_null(vm, index);
+        default:
+            luaL_error(L, "index (%d) - invalid data type for bind (%s)", index, lua_typename(L, lua_type(L, lindex)));
+            return SQLITE_MISUSE; /*!*/
+    }
+}
+
+
+static int dbvm_bind_parameter_count(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    lua_pushnumber(L, sqlite3_bind_parameter_count(svm->vm));
+    return 1;
+}
+
+static int dbvm_bind_parameter_name(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    int index = (int)luaL_checknumber(L, 2);
+    dbvm_check_bind_index(L, svm, index);
+    lua_pushstring(L, sqlite3_bind_parameter_name(svm->vm, index));
+    return 1;
+}
+
+static int dbvm_bind(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int index = luaL_checkint(L, 2);
+    int result;
+
+    dbvm_check_bind_index(L, svm, index);
+    result = dbvm_bind_index(L, vm, index, 3);
+
+    lua_pushnumber(L, result);
+    return 1;
+}
+
+static int dbvm_bind_blob(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    int index = luaL_checkint(L, 2);
+    const char *value = luaL_checkstring(L, 3);
+    int len = lua_strlen(L, 3);
+
+    lua_pushnumber(L, sqlite3_bind_blob(svm->vm, index, value, len, SQLITE_TRANSIENT));
+    return 1;
+}
+
+static int dbvm_bind_values(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int top = lua_gettop(L);
+    int result, n;
+
+    if (top - 1 != sqlite3_bind_parameter_count(vm))
+        luaL_error(L,
+            "incorrect number of parameters to bind (%d given, %d to bind)",
+            top - 1,
+            sqlite3_bind_parameter_count(vm)
+        );
+
+    for (n = 2; n <= top; ++n) {
+        if ((result = dbvm_bind_index(L, vm, n - 1, n)) != SQLITE_OK) {
+            lua_pushnumber(L, result);
+            return 1;
+        }
+    }
+
+    lua_pushnumber(L, SQLITE_OK);
+    return 1;
+}
+
+static int dbvm_bind_names(lua_State *L) {
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm = svm->vm;
+    int count = sqlite3_bind_parameter_count(vm);
+    const char *name;
+    int result, n;
+    luaL_checktype(L, 2, LUA_TTABLE);
+
+    for (n = 1; n <= count; ++n) {
+        name = sqlite3_bind_parameter_name(vm, n);
+        if (name && (name[0] == ':' || name[0] == '$')) {
+            lua_pushstring(L, ++name);
+            lua_gettable(L, 2);
+            result = dbvm_bind_index(L, vm, n, -1);
+            lua_pop(L, 1);
+        }
+        else {
+            lua_pushnumber(L, n);
+            lua_gettable(L, 2);
+            result = dbvm_bind_index(L, vm, n, -1);
+            lua_pop(L, 1);
+        }
+
+        if (result != SQLITE_OK) {
+            lua_pushnumber(L, result);
+            return 1;
+        }
+    }
+
+    lua_pushnumber(L, SQLITE_OK);
+    return 1;
+}
+
+/*
+** =======================================================
+** Database (internal management)
+** =======================================================
+*/
+
+/*
+** When creating database handles, always creates a `closed' database handle
+** before opening the actual database; so, if there is a memory error, the
+** database is not left opened.
+**
+** Creates a new 'table' and leaves it in the stack
+*/
+static sdb *newdb (lua_State *L) {
+    sdb *db = (sdb*)lua_newuserdata(L, sizeof(sdb));
+    db->L = L;
+    db->db = NULL;  /* database handle is currently `closed' */
+    db->func = NULL;
+
+    db->busy_cb =
+    db->busy_udata =
+    db->progress_cb =
+    db->progress_udata =
+    db->trace_cb =
+    db->trace_udata = 
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK
+    db->update_hook_cb =
+    db->update_hook_udata =
+    db->commit_hook_cb =
+    db->commit_hook_udata =
+    db->rollback_hook_cb =
+    db->rollback_hook_udata =
+#endif
+     LUA_NOREF;
+
+    luaL_getmetatable(L, sqlite_meta);
+    lua_setmetatable(L, -2);        /* set metatable */
+
+    /* to keep track of 'open' virtual machines */
+    lua_pushlightuserdata(L, db);
+    lua_newtable(L);
+    lua_rawset(L, LUA_REGISTRYINDEX);
+
+    return db;
+}
+
+static int cleanupdb(lua_State *L, sdb *db) {
+    sdb_func *func;
+    sdb_func *func_next;
+    int top;
+    int result;
+
+    /* free associated virtual machines */
+    lua_pushlightuserdata(L, db);
+    lua_rawget(L, LUA_REGISTRYINDEX);
+
+    /* close all used handles */
+    top = lua_gettop(L);
+    lua_pushnil(L);
+    while (lua_next(L, -2)) {
+        sdb_vm *svm = lua_touserdata(L, -2); /* key: vm; val: sql text */
+        cleanupvm(L, svm);
+
+        lua_settop(L, top);
+        lua_pushnil(L);
+    }
+
+    lua_pop(L, 1); /* pop vm table */
+
+    /* remove entry in lua registry table */
+    lua_pushlightuserdata(L, db);
+    lua_pushnil(L);
+    lua_rawset(L, LUA_REGISTRYINDEX);
+
+    /* 'free' all references */
+    luaL_unref(L, LUA_REGISTRYINDEX, db->busy_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->busy_udata);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->progress_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->progress_udata);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->trace_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->trace_udata);
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK
+    luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_udata);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_udata);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_udata);
+#endif
+
+    /* close database */
+    result = sqlite3_close(db->db);
+    db->db = NULL;
+
+    /* free associated memory with created functions */
+    func = db->func;
+    while (func) {
+        func_next = func->next;
+        luaL_unref(L, LUA_REGISTRYINDEX, func->fn_step);
+        luaL_unref(L, LUA_REGISTRYINDEX, func->fn_finalize);
+        luaL_unref(L, LUA_REGISTRYINDEX, func->udata);
+        free(func);
+        func = func_next;
+    }
+    db->func = NULL;
+    return result;
+}
+
+static sdb *lsqlite_getdb(lua_State *L, int index) {
+    sdb *db = (sdb*)luaL_checkudata(L, index, sqlite_meta);
+    if (db == NULL) luaL_typerror(L, index, "sqlite database");
+    return db;
+}
+
+static sdb *lsqlite_checkdb(lua_State *L, int index) {
+    sdb *db = lsqlite_getdb(L, index);
+    if (db->db == NULL) luaL_argerror(L, index, "attempt to use closed sqlite database");
+    return db;
+}
+
+
+/*
+** =======================================================
+** User Defined Functions - Context Methods
+** =======================================================
+*/
+typedef struct {
+    sqlite3_context *ctx;
+    int ud;
+} lcontext;
+
+static lcontext *lsqlite_make_context(lua_State *L) {
+    lcontext *ctx = (lcontext*)lua_newuserdata(L, sizeof(lcontext));
+    lua_rawgeti(L, LUA_REGISTRYINDEX, sqlite_ctx_meta_ref);
+    lua_setmetatable(L, -2);
+    ctx->ctx = NULL;
+    ctx->ud = LUA_NOREF;
+    return ctx;
+}
+
+static lcontext *lsqlite_getcontext(lua_State *L, int index) {
+    lcontext *ctx = (lcontext*)luaL_checkudata(L, index, sqlite_ctx_meta);
+    if (ctx == NULL) luaL_typerror(L, index, "sqlite context");
+    return ctx;
+}
+
+static lcontext *lsqlite_checkcontext(lua_State *L, int index) {
+    lcontext *ctx = lsqlite_getcontext(L, index);
+    if (ctx->ctx == NULL) luaL_argerror(L, index, "invalid sqlite context");
+    return ctx;
+}
+
+static int lcontext_tostring(lua_State *L) {
+    char buff[39];
+    lcontext *ctx = lsqlite_getcontext(L, 1);
+    if (ctx->ctx == NULL)
+        strcpy(buff, "closed");
+    else
+        sprintf(buff, "%p", ctx->ctx);
+    lua_pushfstring(L, "sqlite function context (%s)", buff);
+    return 1;
+}
+
+static void lcontext_check_aggregate(lua_State *L, lcontext *ctx) {
+    sdb_func *func = (sdb_func*)sqlite3_user_data(ctx->ctx);
+    if (!func->aggregate) {
+        luaL_error(L, "attempt to call aggregate method from scalar function");
+    }
+}
+
+static int lcontext_user_data(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    sdb_func *func = (sdb_func*)sqlite3_user_data(ctx->ctx);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, func->udata);
+    return 1;
+}
+
+static int lcontext_get_aggregate_context(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    lcontext_check_aggregate(L, ctx);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, ctx->ud);
+    return 1;
+}
+
+static int lcontext_set_aggregate_context(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    lcontext_check_aggregate(L, ctx);
+    lua_settop(L, 2);
+    luaL_unref(L, LUA_REGISTRYINDEX, ctx->ud);
+    ctx->ud = luaL_ref(L, LUA_REGISTRYINDEX);
+    return 0;
+}
+
+static int lcontext_aggregate_count(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    lcontext_check_aggregate(L, ctx);
+    lua_pushnumber(L, sqlite3_aggregate_count(ctx->ctx));
+    return 1;
+}
+
+#if 0
+void *sqlite3_get_auxdata(sqlite3_context*, int);
+void sqlite3_set_auxdata(sqlite3_context*, int, void*, void (*)(void*));
+#endif
+
+static int lcontext_result(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    switch (lua_type(L, 2)) {
+        case LUA_TNUMBER:
+            sqlite3_result_double(ctx->ctx, luaL_checknumber(L, 2));
+            break;
+        case LUA_TSTRING:
+            sqlite3_result_text(ctx->ctx, luaL_checkstring(L, 2), lua_strlen(L, 2), SQLITE_TRANSIENT);
+            break;
+        case LUA_TNIL:
+        case LUA_TNONE:
+            sqlite3_result_null(ctx->ctx);
+            break;
+        default:
+            luaL_error(L, "invalid result type %s", lua_typename(L, 2));
+            break;
+    }
+
+    return 0;
+}
+
+static int lcontext_result_blob(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    const char *blob = luaL_checkstring(L, 2);
+    int size = lua_strlen(L, 2);
+    sqlite3_result_blob(ctx->ctx, (const void*)blob, size, SQLITE_TRANSIENT);
+    return 0;
+}
+
+static int lcontext_result_double(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    double d = luaL_checknumber(L, 2);
+    sqlite3_result_double(ctx->ctx, d);
+    return 0;
+}
+
+static int lcontext_result_error(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    const char *err = luaL_checkstring(L, 2);
+    int size = lua_strlen(L, 2);
+    sqlite3_result_error(ctx->ctx, err, size);
+    return 0;
+}
+
+static int lcontext_result_int(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    int i = luaL_checkint(L, 2);
+    sqlite3_result_int(ctx->ctx, i);
+    return 0;
+}
+
+static int lcontext_result_null(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    sqlite3_result_null(ctx->ctx);
+    return 0;
+}
+
+static int lcontext_result_text(lua_State *L) {
+    lcontext *ctx = lsqlite_checkcontext(L, 1);
+    const char *text = luaL_checkstring(L, 2);
+    int size = lua_strlen(L, 2);
+    sqlite3_result_text(ctx->ctx, text, size, SQLITE_TRANSIENT);
+    return 0;
+}
+
+/*
+** =======================================================
+** Database Methods
+** =======================================================
+*/
+
+static int db_isopen(lua_State *L) {
+    sdb *db = lsqlite_getdb(L, 1);
+    lua_pushboolean(L, db->db != NULL ? 1 : 0);
+    return 1;
+}
+
+static int db_last_insert_rowid(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    /* conversion warning: int64 -> luaNumber */
+    sqlite_int64 rowid = sqlite3_last_insert_rowid(db->db);
+    lua_Number n = (lua_Number)rowid;
+    if (n == rowid)
+        lua_pushnumber(L, n);
+    else
+        lua_pushfstring(L, "%ll", rowid);
+    return 1;
+}
+
+static int db_changes(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    lua_pushnumber(L, sqlite3_changes(db->db));
+    return 1;
+}
+
+static int db_total_changes(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    lua_pushnumber(L, sqlite3_total_changes(db->db));
+    return 1;
+}
+
+static int db_errcode(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    lua_pushnumber(L, sqlite3_errcode(db->db));
+    return 1;
+}
+
+static int db_errmsg(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    lua_pushstring(L, sqlite3_errmsg(db->db));
+    return 1;
+}
+
+static int db_interrupt(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    sqlite3_interrupt(db->db);
+    return 0;
+}
+
+/*
+** Registering SQL functions:
+*/
+
+static void db_push_value(lua_State *L, sqlite3_value *value) {
+    switch (sqlite3_value_type(value)) {
+        case SQLITE_TEXT:
+            lua_pushlstring(L, (const char*)sqlite3_value_text(value), sqlite3_value_bytes(value));
+            break;
+
+        case SQLITE_INTEGER:
+            {
+                sqlite_int64 i64 = sqlite3_value_int64(value);
+                lua_Number n = (lua_Number)i64;
+                if (n == i64)
+                    lua_pushnumber(L, n);
+                else
+                    lua_pushlstring(L, (const char*)sqlite3_value_text(value), sqlite3_value_bytes(value));
+            }
+            break;
+
+        case SQLITE_FLOAT:
+            lua_pushnumber(L, sqlite3_value_double(value));
+            break;
+
+        case SQLITE_BLOB:
+            lua_pushlstring(L, sqlite3_value_blob(value), sqlite3_value_bytes(value));
+            break;
+
+        case SQLITE_NULL:
+            lua_pushnil(L);
+            break;
+
+        default:
+            /* things done properly (SQLite + Lua SQLite)
+            ** this should never happen */
+            lua_pushnil(L);
+            break;
+    }
+}
+
+/*
+** callback functions used when calling registered sql functions
+*/
+
+/* scalar function to be called
+** callback params: context, values... */
+static void db_sql_normal_function(sqlite3_context *context, int argc, sqlite3_value **argv) {
+    sdb_func *func = (sdb_func*)sqlite3_user_data(context);
+    lua_State *L = func->db->L;
+    int n;
+    lcontext *ctx;
+
+    int top = lua_gettop(L);
+
+    /* ensure there is enough space in the stack */
+    lua_checkstack(L, argc + 3);
+
+    lua_rawgeti(L, LUA_REGISTRYINDEX, func->fn_step);   /* function to call */
+
+    if (!func->aggregate) {
+        ctx = lsqlite_make_context(L); /* push context - used to set results */
+    }
+    else {
+        /* reuse context userdata value */
+        void *p = sqlite3_aggregate_context(context, 1);
+        /* i think it is OK to use assume that using a light user data
+        ** as an entry on LUA REGISTRY table will be unique */
+        lua_pushlightuserdata(L, p);
+        lua_rawget(L, LUA_REGISTRYINDEX);       /* context table */
+
+        if (lua_isnil(L, -1)) { /* not yet created? */
+            lua_pop(L, 1);
+            ctx = lsqlite_make_context(L);
+            lua_pushlightuserdata(L, p);
+            lua_pushvalue(L, -2);
+            lua_rawset(L, LUA_REGISTRYINDEX);
+        }
+        else
+            ctx = lsqlite_getcontext(L, -1);
+    }
+
+    /* push params */
+    for (n = 0; n < argc; ++n) {
+        db_push_value(L, argv[n]);
+    }
+
+    /* set context */
+    ctx->ctx = context;
+
+    if (lua_pcall(L, argc + 1, 0, 0)) {
+        const char *errmsg = lua_tostring(L, -1);
+        int size = lua_strlen(L, -1);
+        sqlite3_result_error(context, errmsg, size);
+    }
+
+    /* invalidate context */
+    ctx->ctx = NULL;
+
+    if (!func->aggregate) {
+        luaL_unref(L, LUA_REGISTRYINDEX, ctx->ud);
+    }
+
+    lua_settop(L, top);
+}
+
+static void db_sql_finalize_function(sqlite3_context *context) {
+    sdb_func *func = (sdb_func*)sqlite3_user_data(context);
+    lua_State *L = func->db->L;
+    void *p = sqlite3_aggregate_context(context, 1); /* minimal mem usage */
+    lcontext *ctx;
+    int top = lua_gettop(L);
+
+    lua_rawgeti(L, LUA_REGISTRYINDEX, func->fn_finalize);   /* function to call */
+
+    /* i think it is OK to use assume that using a light user data
+    ** as an entry on LUA REGISTRY table will be unique */
+    lua_pushlightuserdata(L, p);
+    lua_rawget(L, LUA_REGISTRYINDEX);       /* context table */
+
+    if (lua_isnil(L, -1)) { /* not yet created? - shouldn't happen in finalize function */
+        lua_pop(L, 1);
+        ctx = lsqlite_make_context(L);
+        lua_pushlightuserdata(L, p);
+        lua_pushvalue(L, -2);
+        lua_rawset(L, LUA_REGISTRYINDEX);
+    }
+    else
+        ctx = lsqlite_getcontext(L, -1);
+
+    /* set context */
+    ctx->ctx = context;
+
+    if (lua_pcall(L, 1, 0, 0)) {
+        sqlite3_result_error(context, lua_tostring(L, -1), -1);
+    }
+
+    /* invalidate context */
+    ctx->ctx = NULL;
+
+    /* cleanup context */
+    luaL_unref(L, LUA_REGISTRYINDEX, ctx->ud);
+    /* remove it from registry */
+    lua_pushlightuserdata(L, p);
+    lua_pushnil(L);
+    lua_rawset(L, LUA_REGISTRYINDEX);
+
+    lua_settop(L, top);
+}
+
+/*
+** Register a normal function
+** Params: db, function name, number arguments, [ callback | step, finalize], user data
+** Returns: true on sucess
+**
+** Normal function:
+** Params: context, params
+**
+** Aggregate function:
+** Params of step: context, params
+** Params of finalize: context
+*/
+static int db_register_function(lua_State *L, int aggregate) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    const char *name;
+    int args;
+    int result;
+    sdb_func *func;
+
+    /* safety measure */
+    if (aggregate) aggregate = 1;
+
+    name = luaL_checkstring(L, 2);
+    args = luaL_checkint(L, 3);
+    luaL_checktype(L, 4, LUA_TFUNCTION);
+    if (aggregate) luaL_checktype(L, 5, LUA_TFUNCTION);
+
+    /* maybe an alternative way to allocate memory should be used/avoided */
+    func = (sdb_func*)malloc(sizeof(sdb_func));
+    if (func == NULL) {
+        luaL_error(L, "out of memory");
+    }
+
+    result = sqlite3_create_function(
+        db->db, name, args, SQLITE_UTF8, func,
+        aggregate ? NULL : db_sql_normal_function,
+        aggregate ? db_sql_normal_function : NULL,
+        aggregate ? db_sql_finalize_function : NULL
+    );
+
+    if (result == SQLITE_OK) {
+        /* safety measures for userdata field to be present in the stack */
+        lua_settop(L, 5 + aggregate);
+
+        /* save registered function in db function list */
+        func->db = db;
+        func->aggregate = aggregate;
+        func->next = db->func;
+        db->func = func;
+
+        /* save the setp/normal function callback */
+        lua_pushvalue(L, 4);
+        func->fn_step = luaL_ref(L, LUA_REGISTRYINDEX);
+        /* save user data */
+        lua_pushvalue(L, 5+aggregate);
+        func->udata = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        if (aggregate) {
+            lua_pushvalue(L, 5);
+            func->fn_finalize = luaL_ref(L, LUA_REGISTRYINDEX);
+        }
+        else
+            func->fn_finalize = LUA_NOREF;
+    }
+    else {
+        /* free allocated memory */
+        free(func);
+    }
+
+    lua_pushboolean(L, result == SQLITE_OK ? 1 : 0);
+    return 1;
+}
+
+static int db_create_function(lua_State *L) {
+    return db_register_function(L, 0);
+}
+
+static int db_create_aggregate(lua_State *L) {
+    return db_register_function(L, 1);
+}
+
+/* create_collation; contributed by Thomas Lauer
+*/
+
+typedef struct {
+    lua_State *L;
+    int ref;
+} scc;
+
+static int collwrapper(scc *co,int l1,const void *p1,
+                        int l2,const void *p2) {
+    int res=0;
+    lua_State *L=co->L;
+    lua_rawgeti(L,LUA_REGISTRYINDEX,co->ref);
+    lua_pushlstring(L,p1,l1);
+    lua_pushlstring(L,p2,l2);
+    if (lua_pcall(L,2,1,0)==0) res=(int)lua_tonumber(L,-1);
+    lua_pop(L,1);
+    return res;
+}
+
+static void collfree(scc *co) {
+    if (co) {
+        luaL_unref(co->L,LUA_REGISTRYINDEX,co->ref);
+        free(co);
+    }
+}
+
+static int db_create_collation(lua_State *L) {
+    sdb *db=lsqlite_checkdb(L,1);
+    const char *collname=luaL_checkstring(L,2);
+    scc *co=NULL;
+    int (*collfunc)(scc *,int,const void *,int,const void *)=NULL;
+    lua_settop(L,3); /* default args to nil, and exclude extras */
+    if (lua_isfunction(L,3)) collfunc=collwrapper;
+    else if (!lua_isnil(L,3))
+        luaL_error(L,"create_collation: function or nil expected");
+    if (collfunc != NULL) {
+        co=(scc *)malloc(sizeof(scc)); /* userdata is a no-no as it
+                                          will be garbage-collected */
+        if (co) {
+            co->L=L;
+            /* lua_settop(L,3) above means we don't need: lua_pushvalue(L,3); */
+            co->ref=luaL_ref(L,LUA_REGISTRYINDEX);
+        }
+        else luaL_error(L,"create_collation: could not allocate callback");
+    }
+    sqlite3_create_collation_v2(db->db, collname, SQLITE_UTF8,
+        (void *)co,
+        (int(*)(void*,int,const void*,int,const void*))collfunc,
+        (void(*)(void*))collfree);
+    return 0;
+}
+
+/*
+** trace callback:
+** Params: database, callback function, userdata
+**
+** callback function:
+** Params: userdata, sql
+*/
+static void db_trace_callback(void *user, const char *sql) {
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+
+    /* setup lua callback call */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->trace_cb);    /* get callback */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->trace_udata); /* get callback user data */
+    lua_pushstring(L, sql); /* traced sql statement */
+
+    /* call lua function */
+    lua_pcall(L, 2, 0, 0);
+    /* ignore any error generated by this function */
+
+    lua_settop(L, top);
+}
+
+static int db_trace(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->trace_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->trace_udata);
+
+        db->trace_cb =
+        db->trace_udata = LUA_NOREF;
+
+        /* clear trace handler */
+        sqlite3_trace(db->db, NULL, NULL);
+    }
+    else {
+        luaL_checktype(L, 2, LUA_TFUNCTION);
+
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 3);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->trace_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->trace_udata);
+
+        db->trace_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->trace_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set trace handler */
+        sqlite3_trace(db->db, db_trace_callback, db);
+    }
+
+    return 0;
+}
+
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK
+
+/*
+** update_hook callback:
+** Params: database, callback function, userdata
+**
+** callback function:
+** Params: userdata, {one of SQLITE_INSERT, SQLITE_DELETE, or SQLITE_UPDATE}, 
+**          database name, table name (containing the affected row), rowid of the row
+*/
+static void db_update_hook_callback(void *user, int op, char const *dbname, char const *tblname, sqlite3_int64 rowid) {
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+    lua_Number n = (lua_Number)rowid;
+
+    /* setup lua callback call */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->update_hook_cb);    /* get callback */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->update_hook_udata); /* get callback user data */
+    lua_pushnumber(L, (lua_Number )op);
+    lua_pushstring(L, dbname); /* update_hook database name */
+    lua_pushstring(L, tblname); /* update_hook database name */
+    if (n == rowid)
+        lua_pushnumber(L, n);
+    else
+        lua_pushfstring(L, "%ll", rowid);
+
+    /* call lua function */
+    lua_pcall(L, 5, 0, 0);
+    /* ignore any error generated by this function */
+
+    lua_settop(L, top);
+}
+
+static int db_update_hook(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_udata);
+
+        db->update_hook_cb =
+        db->update_hook_udata = LUA_NOREF;
+
+        /* clear update_hook handler */
+        sqlite3_update_hook(db->db, NULL, NULL);
+    }
+    else {
+        luaL_checktype(L, 2, LUA_TFUNCTION);
+
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 3);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->update_hook_udata);
+
+        db->update_hook_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->update_hook_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set update_hook handler */
+        sqlite3_update_hook(db->db, db_update_hook_callback, db);
+    }
+
+    return 0;
+}
+
+/*
+** commit_hook callback:
+** Params: database, callback function, userdata
+**
+** callback function:
+** Params: userdata
+** Returned value: Return false or nil to continue the COMMIT operation normally.
+**  return true (non false, non nil), then the COMMIT is converted into a ROLLBACK. 
+*/
+static int db_commit_hook_callback(void *user) {
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+    int rollback = 0;
+
+    /* setup lua callback call */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->commit_hook_cb);    /* get callback */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->commit_hook_udata); /* get callback user data */
+
+    /* call lua function */
+    if (!lua_pcall(L, 1, 1, 0))
+        rollback = lua_toboolean(L, -1); /* use result if there was no error */
+
+    lua_settop(L, top);
+    return rollback;
+}
+
+static int db_commit_hook(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_udata);
+
+        db->commit_hook_cb =
+        db->commit_hook_udata = LUA_NOREF;
+
+        /* clear commit_hook handler */
+        sqlite3_commit_hook(db->db, NULL, NULL);
+    }
+    else {
+        luaL_checktype(L, 2, LUA_TFUNCTION);
+
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 3);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->commit_hook_udata);
+
+        db->commit_hook_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->commit_hook_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set commit_hook handler */
+        sqlite3_commit_hook(db->db, db_commit_hook_callback, db);
+    }
+
+    return 0;
+}
+
+/*
+** rollback hook callback:
+** Params: database, callback function, userdata
+**
+** callback function:
+** Params: userdata
+*/
+static void db_rollback_hook_callback(void *user) {
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+
+    /* setup lua callback call */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->rollback_hook_cb);    /* get callback */
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->rollback_hook_udata); /* get callback user data */
+
+    /* call lua function */
+    lua_pcall(L, 1, 0, 0);
+    /* ignore any error generated by this function */
+
+    lua_settop(L, top);
+}
+
+static int db_rollback_hook(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_udata);
+
+        db->rollback_hook_cb =
+        db->rollback_hook_udata = LUA_NOREF;
+
+        /* clear rollback_hook handler */
+        sqlite3_rollback_hook(db->db, NULL, NULL);
+    }
+    else {
+        luaL_checktype(L, 2, LUA_TFUNCTION);
+
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 3);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->rollback_hook_udata);
+
+        db->rollback_hook_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->rollback_hook_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set rollback_hook handler */
+        sqlite3_rollback_hook(db->db, db_rollback_hook_callback, db);
+    }
+
+    return 0;
+}
+
+#endif /* #if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK */
+
+#if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK
+
+/*
+** progress handler:
+** Params: database, number of opcodes, callback function, userdata
+**
+** callback function:
+** Params: userdata
+** returns: 0 to return immediatly and return SQLITE_ABORT, non-zero to continue
+*/
+static int db_progress_callback(void *user) {
+    int result = 1; /* abort by default */
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->progress_cb);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->progress_udata);
+
+    /* call lua function */
+    if (!lua_pcall(L, 1, 1, 0))
+        result = lua_toboolean(L, -1);
+
+    lua_settop(L, top);
+    return result;
+}
+
+static int db_progress_handler(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->progress_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->progress_udata);
+
+        db->progress_cb =
+        db->progress_udata = LUA_NOREF;
+
+        /* clear busy handler */
+        sqlite3_progress_handler(db->db, 0, NULL, NULL);
+    }
+    else {
+        int nop = luaL_checkint(L, 2);  /* number of opcodes */
+        luaL_checktype(L, 3, LUA_TFUNCTION);
+
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 4);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->progress_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->progress_udata);
+
+        db->progress_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->progress_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set progress callback */
+        sqlite3_progress_handler(db->db, nop, db_progress_callback, db);
+    }
+
+    return 0;
+}
+
+#else /* #if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK */
+
+static int db_progress_handler(lua_State *L) {
+    lua_pushliteral(L, "progress callback support disabled at compile time");
+    lua_error(L);
+    return 0;
+}
+
+#endif /* #if !defined(SQLITE_OMIT_PROGRESS_CALLBACK) || !SQLITE_OMIT_PROGRESS_CALLBACK */
+
+/*
+** busy handler:
+** Params: database, callback function, userdata
+**
+** callback function:
+** Params: userdata, number of tries
+** returns: 0 to return immediatly and return SQLITE_BUSY, non-zero to try again
+*/
+static int db_busy_callback(void *user, int tries) {
+    int retry = 0; /* abort by default */
+    sdb *db = (sdb*)user;
+    lua_State *L = db->L;
+    int top = lua_gettop(L);
+
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->busy_cb);
+    lua_rawgeti(L, LUA_REGISTRYINDEX, db->busy_udata);
+    lua_pushnumber(L, tries);
+
+    /* call lua function */
+    if (!lua_pcall(L, 2, 1, 0))
+        retry = lua_toboolean(L, -1);
+
+    lua_settop(L, top);
+    return retry;
+}
+
+static int db_busy_handler(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+
+    if (lua_gettop(L) < 2 || lua_isnil(L, 2)) {
+        luaL_unref(L, LUA_REGISTRYINDEX, db->busy_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->busy_udata);
+
+        db->busy_cb =
+        db->busy_udata = LUA_NOREF;
+
+        /* clear busy handler */
+        sqlite3_busy_handler(db->db, NULL, NULL);
+    }
+    else {
+        luaL_checktype(L, 2, LUA_TFUNCTION);
+        /* make sure we have an userdata field (even if nil) */
+        lua_settop(L, 3);
+
+        luaL_unref(L, LUA_REGISTRYINDEX, db->busy_cb);
+        luaL_unref(L, LUA_REGISTRYINDEX, db->busy_udata);
+
+        db->busy_udata = luaL_ref(L, LUA_REGISTRYINDEX);
+        db->busy_cb = luaL_ref(L, LUA_REGISTRYINDEX);
+
+        /* set busy handler */
+        sqlite3_busy_handler(db->db, db_busy_callback, db);
+    }
+
+    return 0;
+}
+
+static int db_busy_timeout(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    int timeout = luaL_checkint(L, 2);
+    sqlite3_busy_timeout(db->db, timeout);
+
+    /* if there was a timeout callback registered, it is now
+    ** invalid/useless. free any references we may have */
+    luaL_unref(L, LUA_REGISTRYINDEX, db->busy_cb);
+    luaL_unref(L, LUA_REGISTRYINDEX, db->busy_udata);
+    db->busy_cb =
+    db->busy_udata = LUA_NOREF;
+
+    return 0;
+}
+
+/*
+** Params: db, sql, callback, user
+** returns: code [, errmsg]
+**
+** Callback:
+** Params: user, number of columns, values, names
+** Returns: 0 to continue, other value will cause abort
+*/
+static int db_exec_callback(void* user, int columns, char **data, char **names) {
+    int result = SQLITE_ABORT; /* abort by default */
+    lua_State *L = (lua_State*)user;
+    int n;
+
+    int top = lua_gettop(L);
+
+    lua_pushvalue(L, 3); /* function to call */
+    lua_pushvalue(L, 4); /* user data */
+    lua_pushnumber(L, columns); /* total number of rows in result */
+
+    /* column values */
+    lua_pushvalue(L, 6);
+    for (n = 0; n < columns;) {
+        lua_pushstring(L, data[n++]);
+        lua_rawseti(L, -2, n);
+    }
+
+    /* columns names */
+    lua_pushvalue(L, 5);
+    if (lua_isnil(L, -1)) {
+        lua_pop(L, 1);
+        lua_newtable(L);
+        lua_pushvalue(L, -1);
+        lua_replace(L, 5);
+        for (n = 0; n < columns;) {
+            lua_pushstring(L, names[n++]);
+            lua_rawseti(L, -2, n);
+        }
+    }
+
+    /* call lua function */
+    if (!lua_pcall(L, 4, 1, 0)) {
+        if (lua_isnumber(L, -1))
+            result = (int)lua_tonumber(L, -1);
+    }
+
+    lua_settop(L, top);
+    return result;
+}
+
+static int db_exec(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    const char *sql = luaL_checkstring(L, 2);
+    int result;
+
+    if (!lua_isnoneornil(L, 3)) {
+        /* stack:
+        **  3: callback function
+        **  4: userdata
+        **  5: column names
+        **  6: reusable column values
+        */
+        luaL_checktype(L, 3, LUA_TFUNCTION);
+        lua_settop(L, 4);   /* 'trap' userdata - nil extra parameters */
+        lua_pushnil(L);     /* column names not known at this point */
+        lua_newtable(L);    /* column values table */
+
+        result = sqlite3_exec(db->db, sql, db_exec_callback, L, NULL);
+    }
+    else {
+        /* no callbacks */
+        result = sqlite3_exec(db->db, sql, NULL, NULL, NULL);
+    }
+
+    lua_pushnumber(L, result);
+    return 1;
+}
+
+/*
+** Params: db, sql
+** returns: code, compiled length or error message
+*/
+static int db_prepare(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    const char *sql = luaL_checkstring(L, 2);
+    int sql_len = lua_strlen(L, 2);
+    const char *sqltail;
+    sdb_vm *svm;
+    lua_settop(L,2); /* sql is on top of stack for call to newvm */
+    svm = newvm(L, db);
+
+    if (sqlite3_prepare(db->db, sql, sql_len, &svm->vm, &sqltail) != SQLITE_OK) {
+        cleanupvm(L, svm);
+
+        lua_pushnil(L);
+        lua_pushnumber(L, sqlite3_errcode(db->db));
+        return 2;
+    }
+
+    /* vm already in the stack */
+    lua_pushstring(L, sqltail);
+    return 2;
+}
+
+static int db_do_next_row(lua_State *L, int packed) {
+    int result;
+    sdb_vm *svm = lsqlite_checkvm(L, 1);
+    sqlite3_stmt *vm;
+    int columns;
+    int i;
+
+    result = stepvm(L, svm);
+    vm = svm->vm; /* stepvm may change svm->vm if re-prepare is needed */
+    svm->has_values = result == SQLITE_ROW ? 1 : 0;
+    svm->columns = columns = sqlite3_data_count(vm);
+
+    if (result == SQLITE_ROW) {
+        if (packed) {
+            lua_newtable(L);
+            if (packed == 1) {
+                for (i = 0; i < columns;) {
+                    vm_push_column(L, vm, i);
+                    lua_rawseti(L, -2, ++i);
+                }
+            }
+            else {
+                for (i = 0; i < columns; ++i) {
+                    lua_pushstring(L, sqlite3_column_name(vm, i));
+                    vm_push_column(L, vm, i);
+                    lua_rawset(L, -3);
+                }
+            }
+            return 1;
+        }
+        else {
+            lua_checkstack(L, columns);
+            for (i = 0; i < columns; ++i)
+                vm_push_column(L, vm, i);
+            return svm->columns;
+        }
+    }
+
+    if (svm->temp) {
+        /* finalize and check for errors */
+        result = sqlite3_finalize(vm);
+        svm->vm = NULL;
+        cleanupvm(L, svm);
+    }
+    else if (result == SQLITE_DONE) {
+        result = sqlite3_reset(vm);
+    }
+
+    if (result != SQLITE_OK) {
+        lua_pushstring(L, sqlite3_errmsg(svm->db->db));
+        lua_error(L);
+    }
+    return 0;
+}
+
+static int db_next_row(lua_State *L) {
+    return db_do_next_row(L, 0);
+}
+
+static int db_next_packed_row(lua_State *L) {
+    return db_do_next_row(L, 1);
+}
+
+static int db_next_named_row(lua_State *L) {
+    return db_do_next_row(L, 2);
+}
+
+static int dbvm_do_rows(lua_State *L, int(*f)(lua_State *)) {
+    /* sdb_vm *svm =  */
+    lsqlite_checkvm(L, 1);
+    lua_pushvalue(L,1);
+    lua_pushcfunction(L, f);
+    lua_insert(L, -2);
+    return 2;
+}
+
+static int dbvm_rows(lua_State *L) {
+    return dbvm_do_rows(L, db_next_packed_row);
+}
+
+static int dbvm_nrows(lua_State *L) {
+    return dbvm_do_rows(L, db_next_named_row);
+}
+
+static int dbvm_urows(lua_State *L) {
+    return dbvm_do_rows(L, db_next_row);
+}
+
+static int db_do_rows(lua_State *L, int(*f)(lua_State *)) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    const char *sql = luaL_checkstring(L, 2);
+    sdb_vm *svm;
+    lua_settop(L,2); /* sql is on top of stack for call to newvm */
+    svm = newvm(L, db);
+    svm->temp = 1;
+
+    if (sqlite3_prepare(db->db, sql, -1, &svm->vm, NULL) != SQLITE_OK) {
+        cleanupvm(L, svm);
+
+        lua_pushstring(L, sqlite3_errmsg(svm->db->db));
+        lua_error(L);
+    }
+
+    lua_pushcfunction(L, f);
+    lua_insert(L, -2);
+    return 2;
+}
+
+static int db_rows(lua_State *L) {
+    return db_do_rows(L, db_next_packed_row);
+}
+
+static int db_nrows(lua_State *L) {
+    return db_do_rows(L, db_next_named_row);
+}
+
+/* unpacked version of db:rows */
+static int db_urows(lua_State *L) {
+    return db_do_rows(L, db_next_row);
+}
+
+static int db_tostring(lua_State *L) {
+    char buff[32];
+    sdb *db = lsqlite_getdb(L, 1);
+    if (db->db == NULL)
+        strcpy(buff, "closed");
+    else
+        sprintf(buff, "%p", lua_touserdata(L, 1));
+    lua_pushfstring(L, "sqlite database (%s)", buff);
+    return 1;
+}
+
+static int db_close(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    lua_pushnumber(L, cleanupdb(L, db));
+    return 1;
+}
+
+static int db_close_vm(lua_State *L) {
+    sdb *db = lsqlite_checkdb(L, 1);
+    /* cleanup temporary only tables? */
+    int temp = lua_toboolean(L, 2);
+
+    /* free associated virtual machines */
+    lua_pushlightuserdata(L, db);
+    lua_rawget(L, LUA_REGISTRYINDEX);
+
+    /* close all used handles */
+    lua_pushnil(L);
+    while (lua_next(L, -2)) {
+        sdb_vm *svm = lua_touserdata(L, -2); /* key: vm; val: sql text */
+
+        if ((!temp || svm->temp) && svm->vm)
+        {
+            sqlite3_finalize(svm->vm);
+            svm->vm = NULL;
+        }
+
+        /* leave key in the stack */
+        lua_pop(L, 1);
+    }
+    return 0;
+}
+
+static int db_gc(lua_State *L) {
+    sdb *db = lsqlite_getdb(L, 1);
+    if (db->db != NULL)  /* ignore closed databases */
+        cleanupdb(L, db);
+    return 0;
+}
+
+/*
+** =======================================================
+** General library functions
+** =======================================================
+*/
+
+static int lsqlite_version(lua_State *L) {
+    lua_pushstring(L, sqlite3_libversion());
+    return 1;
+}
+
+static int lsqlite_complete(lua_State *L) {
+    const char *sql = luaL_checkstring(L, 1);
+    lua_pushboolean(L, sqlite3_complete(sql));
+    return 1;
+}
+
+#ifndef WIN32
+static int lsqlite_temp_directory(lua_State *L) {
+    const char *oldtemp = sqlite3_temp_directory;
+
+    if (!lua_isnone(L, 1)) {
+        const char *temp = luaL_optstring(L, 1, NULL);
+        if (sqlite3_temp_directory) {
+            sqlite3_free((char*)sqlite3_temp_directory);
+        }
+        if (temp) {
+            sqlite3_temp_directory = sqlite3_mprintf("%s", temp);
+        }
+        else {
+            sqlite3_temp_directory = NULL;
+        }
+    }
+    lua_pushstring(L, oldtemp);
+    return 1;
+}
+#endif
+
+static int lsqlite_do_open(lua_State *L, const char *filename) {
+    sdb *db = newdb(L); /* create and leave in stack */
+
+    if (sqlite3_open(filename, &db->db) == SQLITE_OK) {
+        /* database handle already in the stack - return it */
+        return 1;
+    }
+
+    /* failed to open database */
+    lua_pushnil(L);                             /* push nil */
+    lua_pushnumber(L, sqlite3_errcode(db->db));
+    lua_pushstring(L, sqlite3_errmsg(db->db));  /* push error message */
+
+    /* clean things up */
+    cleanupdb(L, db);
+
+    /* return */
+    return 3;
+}
+
+static int lsqlite_open(lua_State *L) {
+    const char *filename = luaL_checkstring(L, 1);
+    return lsqlite_do_open(L, filename);
+}
+
+static int lsqlite_open_memory(lua_State *L) {
+    return lsqlite_do_open(L, ":memory:");
+}
+
+static int lsqlite_newindex(lua_State *L) {
+    lua_pushliteral(L, "attempt to change readonly table");
+    lua_error(L);
+    return 0;
+}
+
+/*
+** =======================================================
+** Register functions
+** =======================================================
+*/
+
+#define SC(s)   { #s, SQLITE_ ## s },
+#define LSC(s)  { #s, LSQLITE_ ## s },
+
+static const struct {
+    const char* name;
+    int value;
+} sqlite_constants[] = {
+    /* error codes */
+    SC(OK)          SC(ERROR)       SC(INTERNAL)    SC(PERM)
+    SC(ABORT)       SC(BUSY)        SC(LOCKED)      SC(NOMEM)
+    SC(READONLY)    SC(INTERRUPT)   SC(IOERR)       SC(CORRUPT)
+    SC(NOTFOUND)    SC(FULL)        SC(CANTOPEN)    SC(PROTOCOL)
+    SC(EMPTY)       SC(SCHEMA)      SC(TOOBIG)      SC(CONSTRAINT)
+    SC(MISMATCH)    SC(MISUSE)      SC(NOLFS)
+    SC(FORMAT)      SC(NOTADB)
+
+    /* sqlite_step specific return values */
+    SC(RANGE)       SC(ROW)         SC(DONE)
+
+    /* column types */
+    SC(INTEGER)     SC(FLOAT)       SC(TEXT)        SC(BLOB)
+    SC(NULL)
+
+    /* Authorizer Action Codes */
+    SC(CREATE_INDEX       )
+    SC(CREATE_TABLE       )
+    SC(CREATE_TEMP_INDEX  )
+    SC(CREATE_TEMP_TABLE  )
+    SC(CREATE_TEMP_TRIGGER)
+    SC(CREATE_TEMP_VIEW   )
+    SC(CREATE_TRIGGER     )
+    SC(CREATE_VIEW        )
+    SC(DELETE             )
+    SC(DROP_INDEX         )
+    SC(DROP_TABLE         )
+    SC(DROP_TEMP_INDEX    )
+    SC(DROP_TEMP_TABLE    )
+    SC(DROP_TEMP_TRIGGER  )
+    SC(DROP_TEMP_VIEW     )
+    SC(DROP_TRIGGER       )
+    SC(DROP_VIEW          )
+    SC(INSERT             )
+    SC(PRAGMA             )
+    SC(READ               )
+    SC(SELECT             )
+    SC(TRANSACTION        )
+    SC(UPDATE             )
+    SC(ATTACH             )
+    SC(DETACH             )
+    SC(ALTER_TABLE        )
+    SC(REINDEX            )
+    SC(ANALYZE            )
+    SC(CREATE_VTABLE      )
+    SC(DROP_VTABLE        )
+    SC(FUNCTION           )
+    SC(SAVEPOINT          )
+
+    /* terminator */
+    { NULL, 0 }
+};
+
+/* ======================================================= */
+
+static const luaL_Reg dblib[] = {
+    {"isopen",              db_isopen               },
+    {"last_insert_rowid",   db_last_insert_rowid    },
+    {"changes",             db_changes              },
+    {"total_changes",       db_total_changes        },
+    {"errcode",             db_errcode              },
+    {"error_code",          db_errcode              },
+    {"errmsg",              db_errmsg               },
+    {"error_message",       db_errmsg               },
+    {"interrupt",           db_interrupt            },
+
+    {"create_function",     db_create_function      },
+    {"create_aggregate",    db_create_aggregate     },
+    {"create_collation",    db_create_collation     },
+
+    {"trace",               db_trace                },
+    {"progress_handler",    db_progress_handler     },
+    {"busy_timeout",        db_busy_timeout         },
+    {"busy_handler",        db_busy_handler         },
+#if !defined(LSQLITE_OMIT_UPDATE_HOOK) || !LSQLITE_OMIT_UPDATE_HOOK
+    {"update_hook",         db_update_hook          },
+    {"commit_hook",         db_commit_hook          },
+    {"rollback_hook",       db_rollback_hook        },
+#endif
+
+    {"prepare",             db_prepare              },
+    {"rows",                db_rows                 },
+    {"urows",               db_urows                },
+    {"nrows",               db_nrows                },
+
+    {"exec",                db_exec                 },
+    {"execute",             db_exec                 },
+    {"close",               db_close                },
+    {"close_vm",            db_close_vm             },
+
+    {"__tostring",          db_tostring             },
+    {"__gc",                db_gc                   },
+
+    {NULL, NULL}
+};
+
+static const luaL_Reg vmlib[] = {
+    {"isopen",              dbvm_isopen             },
+
+    {"step",                dbvm_step               },
+    {"reset",               dbvm_reset              },
+    {"finalize",            dbvm_finalize           },
+
+    {"columns",             dbvm_columns            },
+
+    {"bind",                dbvm_bind               },
+    {"bind_values",         dbvm_bind_values        },
+    {"bind_names",          dbvm_bind_names         },
+    {"bind_blob",           dbvm_bind_blob          },
+    {"bind_parameter_count",dbvm_bind_parameter_count},
+    {"bind_parameter_name", dbvm_bind_parameter_name},
+
+    {"get_value",           dbvm_get_value          },
+    {"get_values",          dbvm_get_values         },
+    {"get_name",            dbvm_get_name           },
+    {"get_names",           dbvm_get_names          },
+    {"get_type",            dbvm_get_type           },
+    {"get_types",           dbvm_get_types          },
+    {"get_uvalues",         dbvm_get_uvalues        },
+    {"get_unames",          dbvm_get_unames         },
+    {"get_utypes",          dbvm_get_utypes         },
+
+    {"get_named_values",    dbvm_get_named_values   },
+    {"get_named_types",     dbvm_get_named_types    },
+
+    {"rows",                dbvm_rows               },
+    {"urows",               dbvm_urows              },
+    {"nrows",               dbvm_nrows              },
+
+    /* compatibility names (added by request) */
+    {"idata",               dbvm_get_values         },
+    {"inames",              dbvm_get_names          },
+    {"itypes",              dbvm_get_types          },
+    {"data",                dbvm_get_named_values   },
+    {"type",                dbvm_get_named_types    },
+
+    {"__tostring",          dbvm_tostring           },
+    {"__gc",                dbvm_gc                 },
+
+    { NULL, NULL }
+};
+
+static const luaL_Reg ctxlib[] = {
+    {"user_data",               lcontext_user_data              },
+
+    {"get_aggregate_data",      lcontext_get_aggregate_context  },
+    {"set_aggregate_data",      lcontext_set_aggregate_context  },
+    {"aggregate_count",         lcontext_aggregate_count        },
+
+    {"result",                  lcontext_result                 },
+    {"result_null",             lcontext_result_null            },
+    {"result_number",           lcontext_result_double          },
+    {"result_double",           lcontext_result_double          },
+    {"result_int",              lcontext_result_int             },
+    {"result_text",             lcontext_result_text            },
+    {"result_blob",             lcontext_result_blob            },
+    {"result_error",            lcontext_result_error           },
+
+    {"__tostring",              lcontext_tostring               },
+    {NULL, NULL}
+};
+
+static const luaL_Reg sqlitelib[] = {
+    {"version",         lsqlite_version         },
+    {"complete",        lsqlite_complete        },
+#ifndef WIN32
+    {"temp_directory",  lsqlite_temp_directory  },
+#endif
+    {"open",            lsqlite_open            },
+    {"open_memory",     lsqlite_open_memory     },
+
+    {"__newindex",      lsqlite_newindex        },
+    {NULL, NULL}
+};
+
+static void create_meta(lua_State *L, const char *name, const luaL_Reg *lib) {
+    luaL_newmetatable(L, name);
+    lua_pushstring(L, "__index");
+    lua_pushvalue(L, -2);               /* push metatable */
+    lua_rawset(L, -3);                  /* metatable.__index = metatable */
+
+    /* register metatable functions */
+    luaL_openlib(L, NULL, lib, 0);
+
+    /* remove metatable from stack */
+    lua_pop(L, 1);
+}
+
+LUALIB_API int luaopen_lsqlite3(lua_State *L) {
+    create_meta(L, sqlite_meta, dblib);
+    create_meta(L, sqlite_vm_meta, vmlib);
+    create_meta(L, sqlite_ctx_meta, ctxlib);
+
+    luaL_getmetatable(L, sqlite_ctx_meta);
+    sqlite_ctx_meta_ref = luaL_ref(L, LUA_REGISTRYINDEX);
+
+    /* register (local) sqlite metatable */
+    luaL_register(L, "sqlite3", sqlitelib);
+
+    {
+        int i = 0;
+        /* add constants to global table */
+        while (sqlite_constants[i].name) {
+            lua_pushstring(L, sqlite_constants[i].name);
+            lua_pushnumber(L, sqlite_constants[i].value);
+            lua_rawset(L, -3);
+            ++i;
+        }
+    }
+
+    /* set sqlite's metatable to itself - set as readonly (__newindex) */
+    lua_pushvalue(L, -1);
+    lua_setmetatable(L, -2);
+
+    return 1;
+}
+
+
+
+
+#ifdef __cplusplus
+}  // extern "C"
+#endif  // __cplusplus
+
+
+
+