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campo-sirio/sqlite/main.c
alex ed9d03ee76 ggiunto sqlite 
git-svn-id: svn://10.65.10.50/trunk@11835 c028cbd2-c16b-5b4b-a496-9718f37d4682
2004-03-11 22:22:24 +00:00

1137 lines
36 KiB
C
Executable File
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/*
** 2001 September 15
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** Main file for the SQLite library. The routines in this file
** implement the programmer interface to the library. Routines in
** other files are for internal use by SQLite and should not be
** accessed by users of the library.
**
** $Id: main.c,v 1.1.1.1 2004-03-11 22:22:23 alex Exp $
*/
#include "sqliteInt.h"
#include "os.h"
#include <ctype.h>
/*
** A pointer to this structure is used to communicate information
** from sqliteInit into the sqliteInitCallback.
*/
typedef struct {
sqlite *db; /* The database being initialized */
char **pzErrMsg; /* Error message stored here */
} InitData;
/*
** Fill the InitData structure with an error message that indicates
** that the database is corrupt.
*/
static void corruptSchema(InitData *pData, const char *zExtra){
sqliteSetString(pData->pzErrMsg, "malformed database schema",
zExtra!=0 && zExtra[0]!=0 ? " - " : (char*)0, zExtra, (char*)0);
}
/*
** This is the callback routine for the code that initializes the
** database. See sqliteInit() below for additional information.
**
** Each callback contains the following information:
**
** argv[0] = "file-format" or "schema-cookie" or "table" or "index"
** argv[1] = table or index name or meta statement type.
** argv[2] = root page number for table or index. NULL for meta.
** argv[3] = SQL text for a CREATE TABLE or CREATE INDEX statement.
** argv[4] = "1" for temporary files, "0" for main database, "2" or more
** for auxiliary database files.
**
*/
static
int sqliteInitCallback(void *pInit, int argc, char **argv, char **azColName){
InitData *pData = (InitData*)pInit;
int nErr = 0;
assert( argc==5 );
if( argv==0 ) return 0; /* Might happen if EMPTY_RESULT_CALLBACKS are on */
if( argv[0]==0 ){
corruptSchema(pData, 0);
return 1;
}
switch( argv[0][0] ){
case 'v':
case 'i':
case 't': { /* CREATE TABLE, CREATE INDEX, or CREATE VIEW statements */
sqlite *db = pData->db;
if( argv[2]==0 || argv[4]==0 ){
corruptSchema(pData, 0);
return 1;
}
if( argv[3] && argv[3][0] ){
/* Call the parser to process a CREATE TABLE, INDEX or VIEW.
** But because db->init.busy is set to 1, no VDBE code is generated
** or executed. All the parser does is build the internal data
** structures that describe the table, index, or view.
*/
char *zErr;
assert( db->init.busy );
db->init.iDb = atoi(argv[4]);
assert( db->init.iDb>=0 && db->init.iDb<db->nDb );
db->init.newTnum = atoi(argv[2]);
if( sqlite_exec(db, argv[3], 0, 0, &zErr) ){
corruptSchema(pData, zErr);
sqlite_freemem(zErr);
}
db->init.iDb = 0;
}else{
/* If the SQL column is blank it means this is an index that
** was created to be the PRIMARY KEY or to fulfill a UNIQUE
** constraint for a CREATE TABLE. The index should have already
** been created when we processed the CREATE TABLE. All we have
** to do here is record the root page number for that index.
*/
int iDb;
Index *pIndex;
iDb = atoi(argv[4]);
assert( iDb>=0 && iDb<db->nDb );
pIndex = sqliteFindIndex(db, argv[1], db->aDb[iDb].zName);
if( pIndex==0 || pIndex->tnum!=0 ){
/* This can occur if there exists an index on a TEMP table which
** has the same name as another index on a permanent index. Since
** the permanent table is hidden by the TEMP table, we can also
** safely ignore the index on the permanent table.
*/
/* Do Nothing */;
}else{
pIndex->tnum = atoi(argv[2]);
}
}
break;
}
default: {
/* This can not happen! */
nErr = 1;
assert( nErr==0 );
}
}
return nErr;
}
/*
** This is a callback procedure used to reconstruct a table. The
** name of the table to be reconstructed is passed in as argv[0].
**
** This routine is used to automatically upgrade a database from
** format version 1 or 2 to version 3. The correct operation of
** this routine relys on the fact that no indices are used when
** copying a table out to a temporary file.
**
** The change from version 2 to version 3 occurred between SQLite
** version 2.5.6 and 2.6.0 on 2002-July-18.
*/
static
int upgrade_3_callback(void *pInit, int argc, char **argv, char **NotUsed){
InitData *pData = (InitData*)pInit;
int rc;
Table *pTab;
Trigger *pTrig;
char *zErr = 0;
pTab = sqliteFindTable(pData->db, argv[0], 0);
assert( pTab!=0 );
assert( sqliteStrICmp(pTab->zName, argv[0])==0 );
if( pTab ){
pTrig = pTab->pTrigger;
pTab->pTrigger = 0; /* Disable all triggers before rebuilding the table */
}
rc = sqlite_exec_printf(pData->db,
"CREATE TEMP TABLE sqlite_x AS SELECT * FROM '%q'; "
"DELETE FROM '%q'; "
"INSERT INTO '%q' SELECT * FROM sqlite_x; "
"DROP TABLE sqlite_x;",
0, 0, &zErr, argv[0], argv[0], argv[0]);
if( zErr ){
if( *pData->pzErrMsg ) sqlite_freemem(*pData->pzErrMsg);
*pData->pzErrMsg = zErr;
}
/* If an error occurred in the SQL above, then the transaction will
** rollback which will delete the internal symbol tables. This will
** cause the structure that pTab points to be deleted. In case that
** happened, we need to refetch pTab.
*/
pTab = sqliteFindTable(pData->db, argv[0], 0);
if( pTab ){
assert( sqliteStrICmp(pTab->zName, argv[0])==0 );
pTab->pTrigger = pTrig; /* Re-enable triggers */
}
return rc!=SQLITE_OK;
}
/*
** Attempt to read the database schema and initialize internal
** data structures for a single database file. The index of the
** database file is given by iDb. iDb==0 is used for the main
** database. iDb==1 should never be used. iDb>=2 is used for
** auxiliary databases. Return one of the SQLITE_ error codes to
** indicate success or failure.
*/
static int sqliteInitOne(sqlite *db, int iDb, char **pzErrMsg){
int rc;
BtCursor *curMain;
int size;
Table *pTab;
char *azArg[6];
char zDbNum[30];
int meta[SQLITE_N_BTREE_META];
InitData initData;
/*
** The master database table has a structure like this
*/
static char master_schema[] =
"CREATE TABLE sqlite_master(\n"
" type text,\n"
" name text,\n"
" tbl_name text,\n"
" rootpage integer,\n"
" sql text\n"
")"
;
static char temp_master_schema[] =
"CREATE TEMP TABLE sqlite_temp_master(\n"
" type text,\n"
" name text,\n"
" tbl_name text,\n"
" rootpage integer,\n"
" sql text\n"
")"
;
/* The following SQL will read the schema from the master tables.
** The first version works with SQLite file formats 2 or greater.
** The second version is for format 1 files.
**
** Beginning with file format 2, the rowid for new table entries
** (including entries in sqlite_master) is an increasing integer.
** So for file format 2 and later, we can play back sqlite_master
** and all the CREATE statements will appear in the right order.
** But with file format 1, table entries were random and so we
** have to make sure the CREATE TABLEs occur before their corresponding
** CREATE INDEXs. (We don't have to deal with CREATE VIEW or
** CREATE TRIGGER in file format 1 because those constructs did
** not exist then.)
*/
static char init_script[] =
"SELECT type, name, rootpage, sql, 1 FROM sqlite_temp_master "
"UNION ALL "
"SELECT type, name, rootpage, sql, 0 FROM sqlite_master";
static char older_init_script[] =
"SELECT type, name, rootpage, sql, 1 FROM sqlite_temp_master "
"UNION ALL "
"SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
"WHERE type='table' "
"UNION ALL "
"SELECT type, name, rootpage, sql, 0 FROM sqlite_master "
"WHERE type='index'";
assert( iDb>=0 && iDb!=1 && iDb<db->nDb );
/* Construct the schema tables: sqlite_master and sqlite_temp_master
*/
sqliteSafetyOff(db);
azArg[0] = "table";
azArg[1] = MASTER_NAME;
azArg[2] = "2";
azArg[3] = master_schema;
sprintf(zDbNum, "%d", iDb);
azArg[4] = zDbNum;
azArg[5] = 0;
initData.db = db;
initData.pzErrMsg = pzErrMsg;
sqliteInitCallback(&initData, 5, azArg, 0);
pTab = sqliteFindTable(db, MASTER_NAME, "main");
if( pTab ){
pTab->readOnly = 1;
}
if( iDb==0 ){
azArg[1] = TEMP_MASTER_NAME;
azArg[3] = temp_master_schema;
azArg[4] = "1";
sqliteInitCallback(&initData, 5, azArg, 0);
pTab = sqliteFindTable(db, TEMP_MASTER_NAME, "temp");
if( pTab ){
pTab->readOnly = 1;
}
}
sqliteSafetyOn(db);
/* Create a cursor to hold the database open
*/
if( db->aDb[iDb].pBt==0 ) return SQLITE_OK;
rc = sqliteBtreeCursor(db->aDb[iDb].pBt, 2, 0, &curMain);
if( rc ){
sqliteSetString(pzErrMsg, sqlite_error_string(rc), (char*)0);
return rc;
}
/* Get the database meta information
*/
rc = sqliteBtreeGetMeta(db->aDb[iDb].pBt, meta);
if( rc ){
sqliteSetString(pzErrMsg, sqlite_error_string(rc), (char*)0);
sqliteBtreeCloseCursor(curMain);
return rc;
}
db->aDb[iDb].schema_cookie = meta[1];
if( iDb==0 ){
db->next_cookie = meta[1];
db->file_format = meta[2];
size = meta[3];
if( size==0 ){ size = MAX_PAGES; }
db->cache_size = size;
db->safety_level = meta[4];
if( db->safety_level==0 ) db->safety_level = 2;
/*
** file_format==1 Version 2.1.0.
** file_format==2 Version 2.2.0. Add support for INTEGER PRIMARY KEY.
** file_format==3 Version 2.6.0. Fix empty-string index bug.
** file_format==4 Version 2.7.0. Add support for separate numeric and
** text datatypes.
*/
if( db->file_format==0 ){
/* This happens if the database was initially empty */
db->file_format = 4;
}else if( db->file_format>4 ){
sqliteBtreeCloseCursor(curMain);
sqliteSetString(pzErrMsg, "unsupported file format", (char*)0);
return SQLITE_ERROR;
}
}else if( db->file_format!=meta[2] || db->file_format<4 ){
assert( db->file_format>=4 );
if( meta[2]==0 ){
sqliteSetString(pzErrMsg, "cannot attach empty database: ",
db->aDb[iDb].zName, (char*)0);
}else{
sqliteSetString(pzErrMsg, "incompatible file format in auxiliary "
"database: ", db->aDb[iDb].zName, (char*)0);
}
sqliteBtreeClose(db->aDb[iDb].pBt);
db->aDb[iDb].pBt = 0;
return SQLITE_FORMAT;
}
sqliteBtreeSetCacheSize(db->aDb[iDb].pBt, db->cache_size);
sqliteBtreeSetSafetyLevel(db->aDb[iDb].pBt, meta[4]==0 ? 2 : meta[4]);
/* Read the schema information out of the schema tables
*/
assert( db->init.busy );
sqliteSafetyOff(db);
if( iDb==0 ){
rc = sqlite_exec(db,
db->file_format>=2 ? init_script : older_init_script,
sqliteInitCallback, &initData, 0);
}else{
char *zSql = 0;
sqliteSetString(&zSql,
"SELECT type, name, rootpage, sql, ", zDbNum, " FROM \"",
db->aDb[iDb].zName, "\".sqlite_master", (char*)0);
rc = sqlite_exec(db, zSql, sqliteInitCallback, &initData, 0);
sqliteFree(zSql);
}
sqliteSafetyOn(db);
sqliteBtreeCloseCursor(curMain);
if( sqlite_malloc_failed ){
sqliteSetString(pzErrMsg, "out of memory", (char*)0);
rc = SQLITE_NOMEM;
sqliteResetInternalSchema(db, 0);
}
if( rc==SQLITE_OK ){
DbSetProperty(db, iDb, DB_SchemaLoaded);
if( iDb==0 ){
DbSetProperty(db, 1, DB_SchemaLoaded);
}
}else{
sqliteResetInternalSchema(db, iDb);
}
return rc;
}
/*
** Initialize all database files - the main database file, the file
** used to store temporary tables, and any additional database files
** created using ATTACH statements. Return a success code. If an
** error occurs, write an error message into *pzErrMsg.
**
** After the database is initialized, the SQLITE_Initialized
** bit is set in the flags field of the sqlite structure. An
** attempt is made to initialize the database as soon as it
** is opened. If that fails (perhaps because another process
** has the sqlite_master table locked) than another attempt
** is made the first time the database is accessed.
*/
int sqliteInit(sqlite *db, char **pzErrMsg){
int i, rc;
if( db->init.busy ) return SQLITE_OK;
assert( (db->flags & SQLITE_Initialized)==0 );
rc = SQLITE_OK;
db->init.busy = 1;
for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
if( DbHasProperty(db, i, DB_SchemaLoaded) ) continue;
assert( i!=1 ); /* Should have been initialized together with 0 */
rc = sqliteInitOne(db, i, pzErrMsg);
if( rc ){
sqliteResetInternalSchema(db, i);
}
}
db->init.busy = 0;
if( rc==SQLITE_OK ){
db->flags |= SQLITE_Initialized;
sqliteCommitInternalChanges(db);
}
/* If the database is in formats 1 or 2, then upgrade it to
** version 3. This will reconstruct all indices. If the
** upgrade fails for any reason (ex: out of disk space, database
** is read only, interrupt received, etc.) then fail the init.
*/
if( rc==SQLITE_OK && db->file_format<3 ){
char *zErr = 0;
InitData initData;
int meta[SQLITE_N_BTREE_META];
db->magic = SQLITE_MAGIC_OPEN;
initData.db = db;
initData.pzErrMsg = &zErr;
db->file_format = 3;
rc = sqlite_exec(db,
"BEGIN; SELECT name FROM sqlite_master WHERE type='table';",
upgrade_3_callback,
&initData,
&zErr);
if( rc==SQLITE_OK ){
sqliteBtreeGetMeta(db->aDb[0].pBt, meta);
meta[2] = 4;
sqliteBtreeUpdateMeta(db->aDb[0].pBt, meta);
sqlite_exec(db, "COMMIT", 0, 0, 0);
}
if( rc!=SQLITE_OK ){
sqliteSetString(pzErrMsg,
"unable to upgrade database to the version 2.6 format",
zErr ? ": " : 0, zErr, (char*)0);
}
sqlite_freemem(zErr);
}
if( rc!=SQLITE_OK ){
db->flags &= ~SQLITE_Initialized;
}
return rc;
}
/*
** The version of the library
*/
const char rcsid[] = "@(#) \044Id: SQLite version " SQLITE_VERSION " $";
const char sqlite_version[] = SQLITE_VERSION;
/*
** Does the library expect data to be encoded as UTF-8 or iso8859? The
** following global constant always lets us know.
*/
#ifdef SQLITE_UTF8
const char sqlite_encoding[] = "UTF-8";
#else
const char sqlite_encoding[] = "iso8859";
#endif
/*
** Open a new SQLite database. Construct an "sqlite" structure to define
** the state of this database and return a pointer to that structure.
**
** An attempt is made to initialize the in-memory data structures that
** hold the database schema. But if this fails (because the schema file
** is locked) then that step is deferred until the first call to
** sqlite_exec().
*/
sqlite *sqlite_open(const char *zFilename, int mode, char **pzErrMsg){
sqlite *db;
int rc, i;
/* Allocate the sqlite data structure */
db = sqliteMalloc( sizeof(sqlite) );
if( pzErrMsg ) *pzErrMsg = 0;
if( db==0 ) goto no_mem_on_open;
db->onError = OE_Default;
db->priorNewRowid = 0;
db->magic = SQLITE_MAGIC_BUSY;
db->nDb = 2;
db->aDb = db->aDbStatic;
/* db->flags |= SQLITE_ShortColNames; */
sqliteHashInit(&db->aFunc, SQLITE_HASH_STRING, 1);
for(i=0; i<db->nDb; i++){
sqliteHashInit(&db->aDb[i].tblHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&db->aDb[i].idxHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&db->aDb[i].trigHash, SQLITE_HASH_STRING, 0);
sqliteHashInit(&db->aDb[i].aFKey, SQLITE_HASH_STRING, 1);
}
/* Open the backend database driver */
if( zFilename[0]==':' && strcmp(zFilename,":memory:")==0 ){
db->temp_store = 2;
}
rc = sqliteBtreeFactory(db, zFilename, 0, MAX_PAGES, &db->aDb[0].pBt);
if( rc!=SQLITE_OK ){
switch( rc ){
default: {
sqliteSetString(pzErrMsg, "unable to open database: ",
zFilename, (char*)0);
}
}
sqliteFree(db);
sqliteStrRealloc(pzErrMsg);
return 0;
}
db->aDb[0].zName = "main";
db->aDb[1].zName = "temp";
/* Attempt to read the schema */
sqliteRegisterBuiltinFunctions(db);
rc = sqliteInit(db, pzErrMsg);
db->magic = SQLITE_MAGIC_OPEN;
if( sqlite_malloc_failed ){
sqlite_close(db);
goto no_mem_on_open;
}else if( rc!=SQLITE_OK && rc!=SQLITE_BUSY ){
sqlite_close(db);
sqliteStrRealloc(pzErrMsg);
return 0;
}else if( pzErrMsg ){
sqliteFree(*pzErrMsg);
*pzErrMsg = 0;
}
/* Return a pointer to the newly opened database structure */
return db;
no_mem_on_open:
sqliteSetString(pzErrMsg, "out of memory", (char*)0);
sqliteStrRealloc(pzErrMsg);
return 0;
}
/*
** Return the ROWID of the most recent insert
*/
int sqlite_last_insert_rowid(sqlite *db){
return db->lastRowid;
}
/*
** Return the number of changes in the most recent call to sqlite_exec().
*/
int sqlite_changes(sqlite *db){
return db->nChange;
}
/*
** Return the number of changes produced by the last INSERT, UPDATE, or
** DELETE statement to complete execution. The count does not include
** changes due to SQL statements executed in trigger programs that were
** triggered by that statement
*/
int sqlite_last_statement_changes(sqlite *db){
return db->lsChange;
}
/*
** Close an existing SQLite database
*/
void sqlite_close(sqlite *db){
HashElem *i;
int j;
db->want_to_close = 1;
if( sqliteSafetyCheck(db) || sqliteSafetyOn(db) ){
/* printf("DID NOT CLOSE\n"); fflush(stdout); */
return;
}
db->magic = SQLITE_MAGIC_CLOSED;
for(j=0; j<db->nDb; j++){
struct Db *pDb = &db->aDb[j];
if( pDb->pBt ){
sqliteBtreeClose(pDb->pBt);
pDb->pBt = 0;
}
}
sqliteResetInternalSchema(db, 0);
assert( db->nDb<=2 );
assert( db->aDb==db->aDbStatic );
for(i=sqliteHashFirst(&db->aFunc); i; i=sqliteHashNext(i)){
FuncDef *pFunc, *pNext;
for(pFunc = (FuncDef*)sqliteHashData(i); pFunc; pFunc=pNext){
pNext = pFunc->pNext;
sqliteFree(pFunc);
}
}
sqliteHashClear(&db->aFunc);
sqliteFree(db);
}
/*
** Rollback all database files.
*/
void sqliteRollbackAll(sqlite *db){
int i;
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
sqliteBtreeRollback(db->aDb[i].pBt);
db->aDb[i].inTrans = 0;
}
}
sqliteResetInternalSchema(db, 0);
/* sqliteRollbackInternalChanges(db); */
}
/*
** Execute SQL code. Return one of the SQLITE_ success/failure
** codes. Also write an error message into memory obtained from
** malloc() and make *pzErrMsg point to that message.
**
** If the SQL is a query, then for each row in the query result
** the xCallback() function is called. pArg becomes the first
** argument to xCallback(). If xCallback=NULL then no callback
** is invoked, even for queries.
*/
int sqlite_exec(
sqlite *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
sqlite_callback xCallback, /* Invoke this callback routine */
void *pArg, /* First argument to xCallback() */
char **pzErrMsg /* Write error messages here */
){
int rc = SQLITE_OK;
const char *zLeftover;
sqlite_vm *pVm;
int nRetry = 0;
int nChange = 0;
int nCallback;
if( zSql==0 ) return SQLITE_OK;
while( rc==SQLITE_OK && zSql[0] ){
pVm = 0;
rc = sqlite_compile(db, zSql, &zLeftover, &pVm, pzErrMsg);
if( rc!=SQLITE_OK ){
assert( pVm==0 || sqlite_malloc_failed );
return rc;
}
if( pVm==0 ){
/* This happens if the zSql input contained only whitespace */
break;
}
db->nChange += nChange;
nCallback = 0;
while(1){
int nArg;
char **azArg, **azCol;
rc = sqlite_step(pVm, &nArg, (const char***)&azArg,(const char***)&azCol);
if( rc==SQLITE_ROW ){
if( xCallback!=0 && xCallback(pArg, nArg, azArg, azCol) ){
sqlite_finalize(pVm, 0);
return SQLITE_ABORT;
}
nCallback++;
}else{
if( rc==SQLITE_DONE && nCallback==0
&& (db->flags & SQLITE_NullCallback)!=0 && xCallback!=0 ){
xCallback(pArg, nArg, azArg, azCol);
}
rc = sqlite_finalize(pVm, pzErrMsg);
if( rc==SQLITE_SCHEMA && nRetry<2 ){
nRetry++;
rc = SQLITE_OK;
break;
}
if( db->pVdbe==0 ){
nChange = db->nChange;
}
nRetry = 0;
zSql = zLeftover;
while( isspace(zSql[0]) ) zSql++;
break;
}
}
}
return rc;
}
/*
** Compile a single statement of SQL into a virtual machine. Return one
** of the SQLITE_ success/failure codes. Also write an error message into
** memory obtained from malloc() and make *pzErrMsg point to that message.
*/
int sqlite_compile(
sqlite *db, /* The database on which the SQL executes */
const char *zSql, /* The SQL to be executed */
const char **pzTail, /* OUT: Next statement after the first */
sqlite_vm **ppVm, /* OUT: The virtual machine */
char **pzErrMsg /* OUT: Write error messages here */
){
Parse sParse;
if( pzErrMsg ) *pzErrMsg = 0;
if( sqliteSafetyOn(db) ) goto exec_misuse;
if( !db->init.busy ){
if( (db->flags & SQLITE_Initialized)==0 ){
int rc, cnt = 1;
while( (rc = sqliteInit(db, pzErrMsg))==SQLITE_BUSY
&& db->xBusyCallback
&& db->xBusyCallback(db->pBusyArg, "", cnt++)!=0 ){}
if( rc!=SQLITE_OK ){
sqliteStrRealloc(pzErrMsg);
sqliteSafetyOff(db);
return rc;
}
if( pzErrMsg ){
sqliteFree(*pzErrMsg);
*pzErrMsg = 0;
}
}
if( db->file_format<3 ){
sqliteSafetyOff(db);
sqliteSetString(pzErrMsg, "obsolete database file format", (char*)0);
return SQLITE_ERROR;
}
}
assert( (db->flags & SQLITE_Initialized)!=0 || db->init.busy );
if( db->pVdbe==0 ){ db->nChange = 0; }
memset(&sParse, 0, sizeof(sParse));
sParse.db = db;
sqliteRunParser(&sParse, zSql, pzErrMsg);
if( db->xTrace ){
/* Trace only the statment that was compiled.
** Make a copy of that part of the SQL string since zSQL is const
** and we must pass a zero terminated string to the trace function
** The copy is unnecessary if the tail pointer is pointing at the
** beginnig or end of the SQL string.
*/
if( sParse.zTail && sParse.zTail!=zSql && *sParse.zTail ){
char *tmpSql = sqliteStrNDup(zSql, sParse.zTail - zSql);
if( tmpSql ){
db->xTrace(db->pTraceArg, tmpSql);
free(tmpSql);
}else{
/* If a memory error occurred during the copy,
** trace entire SQL string and fall through to the
** sqlite_malloc_failed test to report the error.
*/
db->xTrace(db->pTraceArg, zSql);
}
}else{
db->xTrace(db->pTraceArg, zSql);
}
}
if( sqlite_malloc_failed ){
sqliteSetString(pzErrMsg, "out of memory", (char*)0);
sParse.rc = SQLITE_NOMEM;
sqliteRollbackAll(db);
sqliteResetInternalSchema(db, 0);
db->flags &= ~SQLITE_InTrans;
}
if( sParse.rc==SQLITE_DONE ) sParse.rc = SQLITE_OK;
if( sParse.rc!=SQLITE_OK && pzErrMsg && *pzErrMsg==0 ){
sqliteSetString(pzErrMsg, sqlite_error_string(sParse.rc), (char*)0);
}
sqliteStrRealloc(pzErrMsg);
if( sParse.rc==SQLITE_SCHEMA ){
sqliteResetInternalSchema(db, 0);
}
assert( ppVm );
*ppVm = (sqlite_vm*)sParse.pVdbe;
if( pzTail ) *pzTail = sParse.zTail;
if( sqliteSafetyOff(db) ) goto exec_misuse;
return sParse.rc;
exec_misuse:
if( pzErrMsg ){
*pzErrMsg = 0;
sqliteSetString(pzErrMsg, sqlite_error_string(SQLITE_MISUSE), (char*)0);
sqliteStrRealloc(pzErrMsg);
}
return SQLITE_MISUSE;
}
/*
** The following routine destroys a virtual machine that is created by
** the sqlite_compile() routine.
**
** The integer returned is an SQLITE_ success/failure code that describes
** the result of executing the virtual machine. An error message is
** written into memory obtained from malloc and *pzErrMsg is made to
** point to that error if pzErrMsg is not NULL. The calling routine
** should use sqlite_freemem() to delete the message when it has finished
** with it.
*/
int sqlite_finalize(
sqlite_vm *pVm, /* The virtual machine to be destroyed */
char **pzErrMsg /* OUT: Write error messages here */
){
int rc = sqliteVdbeFinalize((Vdbe*)pVm, pzErrMsg);
sqliteStrRealloc(pzErrMsg);
return rc;
}
/*
** Terminate the current execution of a virtual machine then
** reset the virtual machine back to its starting state so that it
** can be reused. Any error message resulting from the prior execution
** is written into *pzErrMsg. A success code from the prior execution
** is returned.
*/
int sqlite_reset(
sqlite_vm *pVm, /* The virtual machine to be destroyed */
char **pzErrMsg /* OUT: Write error messages here */
){
int rc = sqliteVdbeReset((Vdbe*)pVm, pzErrMsg);
sqliteVdbeMakeReady((Vdbe*)pVm, -1, 0);
sqliteStrRealloc(pzErrMsg);
return rc;
}
/*
** Return a static string that describes the kind of error specified in the
** argument.
*/
const char *sqlite_error_string(int rc){
const char *z;
switch( rc ){
case SQLITE_OK: z = "not an error"; break;
case SQLITE_ERROR: z = "SQL logic error or missing database"; break;
case SQLITE_INTERNAL: z = "internal SQLite implementation flaw"; break;
case SQLITE_PERM: z = "access permission denied"; break;
case SQLITE_ABORT: z = "callback requested query abort"; break;
case SQLITE_BUSY: z = "database is locked"; break;
case SQLITE_LOCKED: z = "database table is locked"; break;
case SQLITE_NOMEM: z = "out of memory"; break;
case SQLITE_READONLY: z = "attempt to write a readonly database"; break;
case SQLITE_INTERRUPT: z = "interrupted"; break;
case SQLITE_IOERR: z = "disk I/O error"; break;
case SQLITE_CORRUPT: z = "database disk image is malformed"; break;
case SQLITE_NOTFOUND: z = "table or record not found"; break;
case SQLITE_FULL: z = "database is full"; break;
case SQLITE_CANTOPEN: z = "unable to open database file"; break;
case SQLITE_PROTOCOL: z = "database locking protocol failure"; break;
case SQLITE_EMPTY: z = "table contains no data"; break;
case SQLITE_SCHEMA: z = "database schema has changed"; break;
case SQLITE_TOOBIG: z = "too much data for one table row"; break;
case SQLITE_CONSTRAINT: z = "constraint failed"; break;
case SQLITE_MISMATCH: z = "datatype mismatch"; break;
case SQLITE_MISUSE: z = "library routine called out of sequence";break;
case SQLITE_NOLFS: z = "kernel lacks large file support"; break;
case SQLITE_AUTH: z = "authorization denied"; break;
case SQLITE_FORMAT: z = "auxiliary database format error"; break;
case SQLITE_RANGE: z = "bind index out of range"; break;
case SQLITE_NOTADB: z = "file is encrypted or is not a database";break;
default: z = "unknown error"; break;
}
return z;
}
/*
** This routine implements a busy callback that sleeps and tries
** again until a timeout value is reached. The timeout value is
** an integer number of milliseconds passed in as the first
** argument.
*/
static int sqliteDefaultBusyCallback(
void *Timeout, /* Maximum amount of time to wait */
const char *NotUsed, /* The name of the table that is busy */
int count /* Number of times table has been busy */
){
#if SQLITE_MIN_SLEEP_MS==1
static const char delays[] =
{ 1, 2, 5, 10, 15, 20, 25, 25, 25, 50, 50, 50, 100};
static const short int totals[] =
{ 0, 1, 3, 8, 18, 33, 53, 78, 103, 128, 178, 228, 287};
# define NDELAY (sizeof(delays)/sizeof(delays[0]))
int timeout = (int)Timeout;
int delay, prior;
if( count <= NDELAY ){
delay = delays[count-1];
prior = totals[count-1];
}else{
delay = delays[NDELAY-1];
prior = totals[NDELAY-1] + delay*(count-NDELAY-1);
}
if( prior + delay > timeout ){
delay = timeout - prior;
if( delay<=0 ) return 0;
}
sqliteOsSleep(delay);
return 1;
#else
int timeout = (int)Timeout;
if( (count+1)*1000 > timeout ){
return 0;
}
sqliteOsSleep(1000);
return 1;
#endif
}
/*
** This routine sets the busy callback for an Sqlite database to the
** given callback function with the given argument.
*/
void sqlite_busy_handler(
sqlite *db,
int (*xBusy)(void*,const char*,int),
void *pArg
){
db->xBusyCallback = xBusy;
db->pBusyArg = pArg;
}
#ifndef SQLITE_OMIT_PROGRESS_CALLBACK
/*
** This routine sets the progress callback for an Sqlite database to the
** given callback function with the given argument. The progress callback will
** be invoked every nOps opcodes.
*/
void sqlite_progress_handler(
sqlite *db,
int nOps,
int (*xProgress)(void*),
void *pArg
){
if( nOps>0 ){
db->xProgress = xProgress;
db->nProgressOps = nOps;
db->pProgressArg = pArg;
}else{
db->xProgress = 0;
db->nProgressOps = 0;
db->pProgressArg = 0;
}
}
#endif
/*
** This routine installs a default busy handler that waits for the
** specified number of milliseconds before returning 0.
*/
void sqlite_busy_timeout(sqlite *db, int ms){
if( ms>0 ){
sqlite_busy_handler(db, sqliteDefaultBusyCallback, (void*)ms);
}else{
sqlite_busy_handler(db, 0, 0);
}
}
/*
** Cause any pending operation to stop at its earliest opportunity.
*/
void sqlite_interrupt(sqlite *db){
db->flags |= SQLITE_Interrupt;
}
/*
** Windows systems should call this routine to free memory that
** is returned in the in the errmsg parameter of sqlite_open() when
** SQLite is a DLL. For some reason, it does not work to call free()
** directly.
**
** Note that we need to call free() not sqliteFree() here, since every
** string that is exported from SQLite should have already passed through
** sqliteStrRealloc().
*/
void sqlite_freemem(void *p){ free(p); }
/*
** Windows systems need functions to call to return the sqlite_version
** and sqlite_encoding strings since they are unable to access constants
** within DLLs.
*/
const char *sqlite_libversion(void){ return sqlite_version; }
const char *sqlite_libencoding(void){ return sqlite_encoding; }
/*
** Create new user-defined functions. The sqlite_create_function()
** routine creates a regular function and sqlite_create_aggregate()
** creates an aggregate function.
**
** Passing a NULL xFunc argument or NULL xStep and xFinalize arguments
** disables the function. Calling sqlite_create_function() with the
** same name and number of arguments as a prior call to
** sqlite_create_aggregate() disables the prior call to
** sqlite_create_aggregate(), and vice versa.
**
** If nArg is -1 it means that this function will accept any number
** of arguments, including 0. The maximum allowed value of nArg is 127.
*/
int sqlite_create_function(
sqlite *db, /* Add the function to this database connection */
const char *zName, /* Name of the function to add */
int nArg, /* Number of arguments */
void (*xFunc)(sqlite_func*,int,const char**), /* The implementation */
void *pUserData /* User data */
){
FuncDef *p;
int nName;
if( db==0 || zName==0 || sqliteSafetyCheck(db) ) return 1;
if( nArg<-1 || nArg>127 ) return 1;
nName = strlen(zName);
if( nName>255 ) return 1;
p = sqliteFindFunction(db, zName, nName, nArg, 1);
if( p==0 ) return 1;
p->xFunc = xFunc;
p->xStep = 0;
p->xFinalize = 0;
p->pUserData = pUserData;
return 0;
}
int sqlite_create_aggregate(
sqlite *db, /* Add the function to this database connection */
const char *zName, /* Name of the function to add */
int nArg, /* Number of arguments */
void (*xStep)(sqlite_func*,int,const char**), /* The step function */
void (*xFinalize)(sqlite_func*), /* The finalizer */
void *pUserData /* User data */
){
FuncDef *p;
int nName;
if( db==0 || zName==0 || sqliteSafetyCheck(db) ) return 1;
if( nArg<-1 || nArg>127 ) return 1;
nName = strlen(zName);
if( nName>255 ) return 1;
p = sqliteFindFunction(db, zName, nName, nArg, 1);
if( p==0 ) return 1;
p->xFunc = 0;
p->xStep = xStep;
p->xFinalize = xFinalize;
p->pUserData = pUserData;
return 0;
}
/*
** Change the datatype for all functions with a given name. See the
** header comment for the prototype of this function in sqlite.h for
** additional information.
*/
int sqlite_function_type(sqlite *db, const char *zName, int dataType){
FuncDef *p = (FuncDef*)sqliteHashFind(&db->aFunc, zName, strlen(zName));
while( p ){
p->dataType = dataType;
p = p->pNext;
}
return SQLITE_OK;
}
/*
** Register a trace function. The pArg from the previously registered trace
** is returned.
**
** A NULL trace function means that no tracing is executes. A non-NULL
** trace is a pointer to a function that is invoked at the start of each
** sqlite_exec().
*/
void *sqlite_trace(sqlite *db, void (*xTrace)(void*,const char*), void *pArg){
void *pOld = db->pTraceArg;
db->xTrace = xTrace;
db->pTraceArg = pArg;
return pOld;
}
/*** EXPERIMENTAL ***
**
** Register a function to be invoked when a transaction comments.
** If either function returns non-zero, then the commit becomes a
** rollback.
*/
void *sqlite_commit_hook(
sqlite *db, /* Attach the hook to this database */
int (*xCallback)(void*), /* Function to invoke on each commit */
void *pArg /* Argument to the function */
){
void *pOld = db->pCommitArg;
db->xCommitCallback = xCallback;
db->pCommitArg = pArg;
return pOld;
}
/*
** This routine is called to create a connection to a database BTree
** driver. If zFilename is the name of a file, then that file is
** opened and used. If zFilename is the magic name ":memory:" then
** the database is stored in memory (and is thus forgotten as soon as
** the connection is closed.) If zFilename is NULL then the database
** is for temporary use only and is deleted as soon as the connection
** is closed.
**
** A temporary database can be either a disk file (that is automatically
** deleted when the file is closed) or a set of red-black trees held in memory,
** depending on the values of the TEMP_STORE compile-time macro and the
** db->temp_store variable, according to the following chart:
**
** TEMP_STORE db->temp_store Location of temporary database
** ---------- -------------- ------------------------------
** 0 any file
** 1 1 file
** 1 2 memory
** 1 0 file
** 2 1 file
** 2 2 memory
** 2 0 memory
** 3 any memory
*/
int sqliteBtreeFactory(
const sqlite *db, /* Main database when opening aux otherwise 0 */
const char *zFilename, /* Name of the file containing the BTree database */
int omitJournal, /* if TRUE then do not journal this file */
int nCache, /* How many pages in the page cache */
Btree **ppBtree){ /* Pointer to new Btree object written here */
assert( ppBtree != 0);
#ifndef SQLITE_OMIT_INMEMORYDB
if( zFilename==0 ){
if (TEMP_STORE == 0) {
/* Always use file based temporary DB */
return sqliteBtreeOpen(0, omitJournal, nCache, ppBtree);
} else if (TEMP_STORE == 1 || TEMP_STORE == 2) {
/* Switch depending on compile-time and/or runtime settings. */
int location = db->temp_store==0 ? TEMP_STORE : db->temp_store;
if (location == 1) {
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
} else {
return sqliteRbtreeOpen(0, 0, 0, ppBtree);
}
} else {
/* Always use in-core DB */
return sqliteRbtreeOpen(0, 0, 0, ppBtree);
}
}else if( zFilename[0]==':' && strcmp(zFilename,":memory:")==0 ){
return sqliteRbtreeOpen(0, 0, 0, ppBtree);
}else
#endif
{
return sqliteBtreeOpen(zFilename, omitJournal, nCache, ppBtree);
}
}
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