#include "sqliteInt.h"
#ifndef SQLITE_OMIT_ATTACH
static int resolveAttachExpr(NameContext *pName, Expr *pExpr)
{
int rc = SQLITE_OK;
if( pExpr ){
if( pExpr->op!=TK_ID ){
rc = sqlite3ExprResolveNames(pName, pExpr);
}else{
pExpr->op = TK_STRING;
}
}
return rc;
}
static void attachFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int i;
int rc = 0;
sqlite3 *db = sqlite3_user_data(context);
const char *zName;
const char *zFile;
Db *aNew;
char zErr[128];
char *zErrDyn = 0;
zFile = (const char *)sqlite3_value_text(argv[0]);
zName = (const char *)sqlite3_value_text(argv[1]);
if( zFile==0 ) zFile = "";
if( zName==0 ) zName = "";
if( db->nDb>=MAX_ATTACHED+2 ){
sqlite3_snprintf(
sizeof(zErr), zErr, "too many attached databases - max %d", MAX_ATTACHED
);
goto attach_error;
}
if( !db->autoCommit ){
strcpy(zErr, "cannot ATTACH database within transaction");
goto attach_error;
}
for(i=0; i<db->nDb; i++){
char *z = db->aDb[i].zName;
if( z && zName && sqlite3StrICmp(z, zName)==0 ){
sqlite3_snprintf(sizeof(zErr), zErr, "database %s is already in use", zName);
goto attach_error;
}
}
if( db->aDb==db->aDbStatic ){
aNew = sqliteMalloc( sizeof(db->aDb[0])*3 );
if( aNew==0 ){
return;
}
memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
}else{
aNew = sqliteRealloc(db->aDb, sizeof(db->aDb[0])*(db->nDb+1) );
if( aNew==0 ){
return;
}
}
db->aDb = aNew;
aNew = &db->aDb[db->nDb++];
memset(aNew, 0, sizeof(*aNew));
rc = sqlite3BtreeFactory(db, zFile, 0, MAX_PAGES, &aNew->pBt);
if( rc==SQLITE_OK ){
aNew->pSchema = sqlite3SchemaGet(aNew->pBt);
if( !aNew->pSchema ){
rc = SQLITE_NOMEM;
}else if( aNew->pSchema->file_format && aNew->pSchema->enc!=ENC(db) ){
strcpy(zErr,
"attached databases must use the same text encoding as main database");
goto attach_error;
}
sqlite3PagerLockingMode(sqlite3BtreePager(aNew->pBt), db->dfltLockMode);
}
aNew->zName = sqliteStrDup(zName);
aNew->safety_level = 3;
#if SQLITE_HAS_CODEC
{
extern int sqlite3CodecAttach(sqlite3*, int, const void*, int);
extern void sqlite3CodecGetKey(sqlite3*, int, void**, int*);
int nKey;
char *zKey;
int t = sqlite3_value_type(argv[2]);
switch( t ){
case SQLITE_INTEGER:
case SQLITE_FLOAT:
zErrDyn = sqliteStrDup("Invalid key value");
rc = SQLITE_ERROR;
break;
case SQLITE_TEXT:
case SQLITE_BLOB:
nKey = sqlite3_value_bytes(argv[2]);
zKey = (char *)sqlite3_value_blob(argv[2]);
sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
break;
case SQLITE_NULL:
sqlite3CodecGetKey(db, 0, (void**)&zKey, &nKey);
sqlite3CodecAttach(db, db->nDb-1, zKey, nKey);
break;
}
}
#endif
if( rc==SQLITE_OK ){
sqlite3SafetyOn(db);
rc = sqlite3Init(db, &zErrDyn);
sqlite3SafetyOff(db);
}
if( rc ){
int iDb = db->nDb - 1;
assert( iDb>=2 );
if( db->aDb[iDb].pBt ){
sqlite3BtreeClose(db->aDb[iDb].pBt);
db->aDb[iDb].pBt = 0;
db->aDb[iDb].pSchema = 0;
}
sqlite3ResetInternalSchema(db, 0);
db->nDb = iDb;
if( rc==SQLITE_NOMEM ){
sqlite3FailedMalloc();
sqlite3_snprintf(sizeof(zErr),zErr, "out of memory");
}else{
sqlite3_snprintf(sizeof(zErr),zErr, "unable to open database: %s", zFile);
}
goto attach_error;
}
return;
attach_error:
if( zErrDyn ){
sqlite3_result_error(context, zErrDyn, -1);
sqliteFree(zErrDyn);
}else{
zErr[sizeof(zErr)-1] = 0;
sqlite3_result_error(context, zErr, -1);
}
}
static void detachFunc(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
const char *zName = (const char *)sqlite3_value_text(argv[0]);
sqlite3 *db = sqlite3_user_data(context);
int i;
Db *pDb = 0;
char zErr[128];
if( zName==0 ) zName = "";
for(i=0; i<db->nDb; i++){
pDb = &db->aDb[i];
if( pDb->pBt==0 ) continue;
if( sqlite3StrICmp(pDb->zName, zName)==0 ) break;
}
if( i>=db->nDb ){
sqlite3_snprintf(sizeof(zErr),zErr, "no such database: %s", zName);
goto detach_error;
}
if( i<2 ){
sqlite3_snprintf(sizeof(zErr),zErr, "cannot detach database %s", zName);
goto detach_error;
}
if( !db->autoCommit ){
strcpy(zErr, "cannot DETACH database within transaction");
goto detach_error;
}
if( sqlite3BtreeIsInReadTrans(pDb->pBt) ){
sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);
goto detach_error;
}
sqlite3BtreeClose(pDb->pBt);
pDb->pBt = 0;
pDb->pSchema = 0;
sqlite3ResetInternalSchema(db, 0);
return;
detach_error:
sqlite3_result_error(context, zErr, -1);
}
static void codeAttach(
Parse *pParse,
int type,
const char *zFunc,
int nFunc,
Expr *pAuthArg,
Expr *pFilename,
Expr *pDbname,
Expr *pKey
){
int rc;
NameContext sName;
Vdbe *v;
FuncDef *pFunc;
sqlite3* db = pParse->db;
#ifndef SQLITE_OMIT_AUTHORIZATION
assert( sqlite3MallocFailed() || pAuthArg );
if( pAuthArg ){
char *zAuthArg = sqlite3NameFromToken(&pAuthArg->span);
if( !zAuthArg ){
goto attach_end;
}
rc = sqlite3AuthCheck(pParse, type, zAuthArg, 0, 0);
sqliteFree(zAuthArg);
if(rc!=SQLITE_OK ){
goto attach_end;
}
}
#endif
memset(&sName, 0, sizeof(NameContext));
sName.pParse = pParse;
if(
SQLITE_OK!=(rc = resolveAttachExpr(&sName, pFilename)) ||
SQLITE_OK!=(rc = resolveAttachExpr(&sName, pDbname)) ||
SQLITE_OK!=(rc = resolveAttachExpr(&sName, pKey))
){
pParse->nErr++;
goto attach_end;
}
v = sqlite3GetVdbe(pParse);
sqlite3ExprCode(pParse, pFilename);
sqlite3ExprCode(pParse, pDbname);
sqlite3ExprCode(pParse, pKey);
assert( v || sqlite3MallocFailed() );
if( v ){
sqlite3VdbeAddOp(v, OP_Function, 0, nFunc);
pFunc = sqlite3FindFunction(db, zFunc, strlen(zFunc), nFunc, SQLITE_UTF8,0);
sqlite3VdbeChangeP3(v, -1, (char *)pFunc, P3_FUNCDEF);
sqlite3VdbeAddOp(v, OP_Expire, (type==SQLITE_ATTACH), 0);
}
attach_end:
sqlite3ExprDelete(pFilename);
sqlite3ExprDelete(pDbname);
sqlite3ExprDelete(pKey);
}
void sqlite3Detach(Parse *pParse, Expr *pDbname){
codeAttach(pParse, SQLITE_DETACH, "sqlite_detach", 1, pDbname, 0, 0, pDbname);
}
void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){
codeAttach(pParse, SQLITE_ATTACH, "sqlite_attach", 3, p, p, pDbname, pKey);
}
#endif
void sqlite3AttachFunctions(sqlite3 *db){
#ifndef SQLITE_OMIT_ATTACH
static const int enc = SQLITE_UTF8;
sqlite3CreateFunc(db, "sqlite_attach", 3, enc, db, attachFunc, 0, 0);
sqlite3CreateFunc(db, "sqlite_detach", 1, enc, db, detachFunc, 0, 0);
#endif
}
int sqlite3FixInit(
DbFixer *pFix,
Parse *pParse,
int iDb,
const char *zType,
const Token *pName
){
sqlite3 *db;
if( iDb<0 || iDb==1 ) return 0;
db = pParse->db;
assert( db->nDb>iDb );
pFix->pParse = pParse;
pFix->zDb = db->aDb[iDb].zName;
pFix->zType = zType;
pFix->pName = pName;
return 1;
}
int sqlite3FixSrcList(
DbFixer *pFix,
SrcList *pList
){
int i;
const char *zDb;
struct SrcList_item *pItem;
if( pList==0 ) return 0;
zDb = pFix->zDb;
for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
if( pItem->zDatabase==0 ){
pItem->zDatabase = sqliteStrDup(zDb);
}else if( sqlite3StrICmp(pItem->zDatabase,zDb)!=0 ){
sqlite3ErrorMsg(pFix->pParse,
"%s %T cannot reference objects in database %s",
pFix->zType, pFix->pName, pItem->zDatabase);
return 1;
}
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
if( sqlite3FixSelect(pFix, pItem->pSelect) ) return 1;
if( sqlite3FixExpr(pFix, pItem->pOn) ) return 1;
#endif
}
return 0;
}
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
int sqlite3FixSelect(
DbFixer *pFix,
Select *pSelect
){
while( pSelect ){
if( sqlite3FixExprList(pFix, pSelect->pEList) ){
return 1;
}
if( sqlite3FixSrcList(pFix, pSelect->pSrc) ){
return 1;
}
if( sqlite3FixExpr(pFix, pSelect->pWhere) ){
return 1;
}
if( sqlite3FixExpr(pFix, pSelect->pHaving) ){
return 1;
}
pSelect = pSelect->pPrior;
}
return 0;
}
int sqlite3FixExpr(
DbFixer *pFix,
Expr *pExpr
){
while( pExpr ){
if( sqlite3FixSelect(pFix, pExpr->pSelect) ){
return 1;
}
if( sqlite3FixExprList(pFix, pExpr->pList) ){
return 1;
}
if( sqlite3FixExpr(pFix, pExpr->pRight) ){
return 1;
}
pExpr = pExpr->pLeft;
}
return 0;
}
int sqlite3FixExprList(
DbFixer *pFix,
ExprList *pList
){
int i;
struct ExprList_item *pItem;
if( pList==0 ) return 0;
for(i=0, pItem=pList->a; i<pList->nExpr; i++, pItem++){
if( sqlite3FixExpr(pFix, pItem->pExpr) ){
return 1;
}
}
return 0;
}
#endif
#ifndef SQLITE_OMIT_TRIGGER
int sqlite3FixTriggerStep(
DbFixer *pFix,
TriggerStep *pStep
){
while( pStep ){
if( sqlite3FixSelect(pFix, pStep->pSelect) ){
return 1;
}
if( sqlite3FixExpr(pFix, pStep->pWhere) ){
return 1;
}
if( sqlite3FixExprList(pFix, pStep->pExprList) ){
return 1;
}
pStep = pStep->pNext;
}
return 0;
}
#endif