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631 lines (593 loc) · 18.8 KB
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/*
** 2003 April 6
**
** 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.
**
*************************************************************************
** This file contains code used to implement the ATTACH and DETACH commands.
*/
#include "sqliteInt.h"
#ifndef SQLITE_OMIT_ATTACH
/*
** Resolve an expression that was part of an ATTACH or DETACH statement. This
** is slightly different from resolving a normal SQL expression, because simple
** identifiers are treated as strings, not possible column names or aliases.
**
** i.e. if the parser sees:
**
** ATTACH DATABASE abc AS def
**
** it treats the two expressions as literal strings 'abc' and 'def' instead of
** looking for columns of the same name.
**
** This only applies to the root node of pExpr, so the statement:
**
** ATTACH DATABASE abc||def AS 'db2'
**
** will fail because neither abc or def can be resolved.
*/
static int resolveAttachExpr(NameContext *pName, Expr *pExpr)
{
int rc = SQLITE_OK;
if( pExpr ){
if( pExpr->op!=TK_ID ){
rc = sqlite3ResolveExprNames(pName, pExpr);
}else{
pExpr->op = TK_STRING;
}
}
return rc;
}
/*
** Return true if zName points to a name that may be used to refer to
** database iDb attached to handle db.
*/
int sqlite3DbIsNamed(sqlite3 *db, int iDb, const char *zName){
return (
sqlite3StrICmp(db->aDb[iDb].zDbSName, zName)==0
|| (iDb==0 && sqlite3StrICmp("main", zName)==0)
);
}
/*
** An SQL user-function registered to do the work of an ATTACH statement. The
** three arguments to the function come directly from an attach statement:
**
** ATTACH DATABASE x AS y KEY z
**
** SELECT sqlite_attach(x, y, z)
**
** If the optional "KEY z" syntax is omitted, an SQL NULL is passed as the
** third argument.
**
** If the db->init.reopenMemdb flags is set, then instead of attaching a
** new database, close the database on db->init.iDb and reopen it as an
** empty MemDB.
*/
static void attachFunc(
sqlite3_context *context,
int NotUsed,
sqlite3_value **argv
){
int i;
int rc = 0;
sqlite3 *db = sqlite3_context_db_handle(context);
const char *zName;
const char *zFile;
char *zPath = 0;
char *zErr = 0;
unsigned int flags;
Db *aNew; /* New array of Db pointers */
Db *pNew = 0; /* Db object for the newly attached database */
char *zErrDyn = 0;
sqlite3_vfs *pVfs;
UNUSED_PARAMETER(NotUsed);
zFile = (const char *)sqlite3_value_text(argv[0]);
zName = (const char *)sqlite3_value_text(argv[1]);
if( zFile==0 ) zFile = "";
if( zName==0 ) zName = "";
#ifndef SQLITE_OMIT_DESERIALIZE
# define REOPEN_AS_MEMDB(db) (db->init.reopenMemdb)
#else
# define REOPEN_AS_MEMDB(db) (0)
#endif
if( REOPEN_AS_MEMDB(db) ){
/* This is not a real ATTACH. Instead, this routine is being called
** from sqlite3_deserialize() to close database db->init.iDb and
** reopen it as a MemDB */
Btree *pNewBt = 0;
pNew = &db->aDb[db->init.iDb];
assert( pNew->pBt!=0 );
if( sqlite3BtreeTxnState(pNew->pBt)!=SQLITE_TXN_NONE
|| sqlite3BtreeIsInBackup(pNew->pBt)
){
rc = SQLITE_BUSY;
goto attach_error;
}
pVfs = sqlite3_vfs_find("memdb");
if( pVfs==0 ) return;
rc = sqlite3BtreeOpen(pVfs, "x\0", db, &pNewBt, 0, SQLITE_OPEN_MAIN_DB);
if( rc==SQLITE_OK ){
Schema *pNewSchema = sqlite3SchemaGet(db, pNewBt);
if( pNewSchema ){
/* Both the Btree and the new Schema were allocated successfully.
** Close the old db and update the aDb[] slot with the new memdb
** values. */
sqlite3BtreeClose(pNew->pBt);
pNew->pBt = pNewBt;
pNew->pSchema = pNewSchema;
}else{
sqlite3BtreeClose(pNewBt);
rc = SQLITE_NOMEM;
}
}
if( rc ) goto attach_error;
}else{
/* This is a real ATTACH
**
** Check for the following errors:
**
** * Too many attached databases,
** * Transaction currently open
** * Specified database name already being used.
*/
if( db->nDb>=db->aLimit[SQLITE_LIMIT_ATTACHED]+2 ){
zErrDyn = sqlite3MPrintf(db, "too many attached databases - max %d",
db->aLimit[SQLITE_LIMIT_ATTACHED]
);
goto attach_error;
}
for(i=0; i<db->nDb; i++){
assert( zName );
if( sqlite3DbIsNamed(db, i, zName) ){
zErrDyn = sqlite3MPrintf(db, "database %s is already in use", zName);
goto attach_error;
}
}
/* Allocate the new entry in the db->aDb[] array and initialize the schema
** hash tables.
*/
if( db->aDb==db->aDbStatic ){
aNew = sqlite3DbMallocRawNN(db, sizeof(db->aDb[0])*3 );
if( aNew==0 ) return;
memcpy(aNew, db->aDb, sizeof(db->aDb[0])*2);
}else{
aNew = sqlite3DbRealloc(db, db->aDb, sizeof(db->aDb[0])*(1+(i64)db->nDb));
if( aNew==0 ) return;
}
db->aDb = aNew;
pNew = &db->aDb[db->nDb];
memset(pNew, 0, sizeof(*pNew));
/* Open the database file. If the btree is successfully opened, use
** it to obtain the database schema. At this point the schema may
** or may not be initialized.
*/
flags = db->openFlags;
rc = sqlite3ParseUri(db->pVfs->zName, zFile, &flags, &pVfs, &zPath, &zErr);
if( rc!=SQLITE_OK ){
if( rc==SQLITE_NOMEM ) sqlite3OomFault(db);
sqlite3_result_error(context, zErr, -1);
sqlite3_free(zErr);
return;
}
if( (db->flags & SQLITE_AttachWrite)==0 ){
flags &= ~(SQLITE_OPEN_CREATE|SQLITE_OPEN_READWRITE);
flags |= SQLITE_OPEN_READONLY;
}else if( (db->flags & SQLITE_AttachCreate)==0 ){
flags &= ~SQLITE_OPEN_CREATE;
}
assert( pVfs );
flags |= SQLITE_OPEN_MAIN_DB;
rc = sqlite3BtreeOpen(pVfs, zPath, db, &pNew->pBt, 0, flags);
db->nDb++;
pNew->zDbSName = sqlite3DbStrDup(db, zName);
}
db->noSharedCache = 0;
if( rc==SQLITE_CONSTRAINT ){
rc = SQLITE_ERROR;
zErrDyn = sqlite3MPrintf(db, "database is already attached");
}else if( rc==SQLITE_OK ){
Pager *pPager;
pNew->pSchema = sqlite3SchemaGet(db, pNew->pBt);
if( !pNew->pSchema ){
rc = SQLITE_NOMEM_BKPT;
}else if( pNew->pSchema->file_format && pNew->pSchema->enc!=ENC(db) ){
zErrDyn = sqlite3MPrintf(db,
"attached databases must use the same text encoding as main database");
rc = SQLITE_ERROR;
}
sqlite3BtreeEnter(pNew->pBt);
pPager = sqlite3BtreePager(pNew->pBt);
sqlite3PagerLockingMode(pPager, db->dfltLockMode);
sqlite3BtreeSecureDelete(pNew->pBt,
sqlite3BtreeSecureDelete(db->aDb[0].pBt,-1) );
#ifndef SQLITE_OMIT_PAGER_PRAGMAS
sqlite3BtreeSetPagerFlags(pNew->pBt,
PAGER_SYNCHRONOUS_FULL | (db->flags & PAGER_FLAGS_MASK));
#endif
sqlite3BtreeLeave(pNew->pBt);
}
pNew->safety_level = SQLITE_DEFAULT_SYNCHRONOUS+1;
if( rc==SQLITE_OK && pNew->zDbSName==0 ){
rc = SQLITE_NOMEM_BKPT;
}
sqlite3_free_filename( zPath );
/* If the file was opened successfully, read the schema for the new database.
** If this fails, or if opening the file failed, then close the file and
** remove the entry from the db->aDb[] array. i.e. put everything back the
** way we found it.
*/
if( rc==SQLITE_OK ){
sqlite3BtreeEnterAll(db);
db->init.iDb = 0;
db->mDbFlags &= ~(DBFLAG_SchemaKnownOk);
#ifdef SQLITE_ENABLE_SETLK_TIMEOUT
if( db->setlkFlags & SQLITE_SETLK_BLOCK_ON_CONNECT ){
int val = 1;
sqlite3_file *fd = sqlite3PagerFile(sqlite3BtreePager(pNew->pBt));
sqlite3OsFileControlHint(fd, SQLITE_FCNTL_BLOCK_ON_CONNECT, &val);
}
#endif
if( !REOPEN_AS_MEMDB(db) ){
rc = sqlite3Init(db, &zErrDyn);
}
sqlite3BtreeLeaveAll(db);
assert( zErrDyn==0 || rc!=SQLITE_OK );
}
if( rc ){
if( ALWAYS(!REOPEN_AS_MEMDB(db)) ){
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;
}
sqlite3ResetAllSchemasOfConnection(db);
db->nDb = iDb;
if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
sqlite3OomFault(db);
sqlite3DbFree(db, zErrDyn);
zErrDyn = sqlite3MPrintf(db, "out of memory");
}else if( zErrDyn==0 ){
zErrDyn = sqlite3MPrintf(db, "unable to open database: %s", zFile);
}
}
goto attach_error;
}
return;
attach_error:
/* Return an error if we get here */
if( zErrDyn ){
sqlite3_result_error(context, zErrDyn, -1);
sqlite3DbFree(db, zErrDyn);
}
if( rc ) sqlite3_result_error_code(context, rc);
}
/*
** An SQL user-function registered to do the work of an DETACH statement. The
** three arguments to the function come directly from a detach statement:
**
** DETACH DATABASE x
**
** SELECT sqlite_detach(x)
*/
static void detachFunc(
sqlite3_context *context,
int NotUsed,
sqlite3_value **argv
){
const char *zName = (const char *)sqlite3_value_text(argv[0]);
sqlite3 *db = sqlite3_context_db_handle(context);
int i;
Db *pDb = 0;
HashElem *pEntry;
char zErr[128];
UNUSED_PARAMETER(NotUsed);
if( zName==0 ) zName = "";
for(i=0; i<db->nDb; i++){
pDb = &db->aDb[i];
if( pDb->pBt==0 ) continue;
if( sqlite3DbIsNamed(db, i, zName) ) 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( sqlite3BtreeTxnState(pDb->pBt)!=SQLITE_TXN_NONE
|| sqlite3BtreeIsInBackup(pDb->pBt)
){
sqlite3_snprintf(sizeof(zErr),zErr, "database %s is locked", zName);
goto detach_error;
}
/* If any TEMP triggers reference the schema being detached, move those
** triggers to reference the TEMP schema itself. */
assert( db->aDb[1].pSchema );
pEntry = sqliteHashFirst(&db->aDb[1].pSchema->trigHash);
while( pEntry ){
Trigger *pTrig = (Trigger*)sqliteHashData(pEntry);
if( pTrig->pTabSchema==pDb->pSchema ){
pTrig->pTabSchema = pTrig->pSchema;
}
pEntry = sqliteHashNext(pEntry);
}
sqlite3BtreeClose(pDb->pBt);
pDb->pBt = 0;
pDb->pSchema = 0;
sqlite3CollapseDatabaseArray(db);
return;
detach_error:
sqlite3_result_error(context, zErr, -1);
}
/*
** This procedure generates VDBE code for a single invocation of either the
** sqlite_detach() or sqlite_attach() SQL user functions.
*/
static void codeAttach(
Parse *pParse, /* The parser context */
int type, /* Either SQLITE_ATTACH or SQLITE_DETACH */
FuncDef const *pFunc,/* FuncDef wrapper for detachFunc() or attachFunc() */
Expr *pAuthArg, /* Expression to pass to authorization callback */
Expr *pFilename, /* Name of database file */
Expr *pDbname, /* Name of the database to use internally */
Expr *pKey /* Database key for encryption extension */
){
int rc;
NameContext sName;
Vdbe *v;
sqlite3* db = pParse->db;
int regArgs;
if( SQLITE_OK!=sqlite3ReadSchema(pParse) ) goto attach_end;
if( pParse->nErr ) goto attach_end;
memset(&sName, 0, sizeof(NameContext));
sName.pParse = pParse;
if(
SQLITE_OK!=resolveAttachExpr(&sName, pFilename) ||
SQLITE_OK!=resolveAttachExpr(&sName, pDbname) ||
SQLITE_OK!=resolveAttachExpr(&sName, pKey)
){
goto attach_end;
}
#ifndef SQLITE_OMIT_AUTHORIZATION
if( ALWAYS(pAuthArg) ){
char *zAuthArg;
if( pAuthArg->op==TK_STRING ){
assert( !ExprHasProperty(pAuthArg, EP_IntValue) );
zAuthArg = pAuthArg->u.zToken;
}else{
zAuthArg = 0;
}
rc = sqlite3AuthCheck(pParse, type, zAuthArg, 0, 0);
if(rc!=SQLITE_OK ){
goto attach_end;
}
}
#endif /* SQLITE_OMIT_AUTHORIZATION */
v = sqlite3GetVdbe(pParse);
regArgs = sqlite3GetTempRange(pParse, 4);
sqlite3ExprCode(pParse, pFilename, regArgs);
sqlite3ExprCode(pParse, pDbname, regArgs+1);
sqlite3ExprCode(pParse, pKey, regArgs+2);
assert( v || db->mallocFailed );
if( v ){
sqlite3VdbeAddFunctionCall(pParse, 0, regArgs+3-pFunc->nArg, regArgs+3,
pFunc->nArg, pFunc, 0);
/* Code an OP_Expire. For an ATTACH statement, set P1 to true (expire this
** statement only). For DETACH, set it to false (expire all existing
** statements).
*/
sqlite3VdbeAddOp1(v, OP_Expire, (type==SQLITE_ATTACH));
}
attach_end:
sqlite3ExprDelete(db, pFilename);
sqlite3ExprDelete(db, pDbname);
sqlite3ExprDelete(db, pKey);
}
/*
** Called by the parser to compile a DETACH statement.
**
** DETACH pDbname
*/
void sqlite3Detach(Parse *pParse, Expr *pDbname){
static const FuncDef detach_func = {
1, /* nArg */
SQLITE_UTF8, /* funcFlags */
0, /* pUserData */
0, /* pNext */
detachFunc, /* xSFunc */
0, /* xFinalize */
0, 0, /* xValue, xInverse */
"sqlite_detach", /* zName */
{0}
};
codeAttach(pParse, SQLITE_DETACH, &detach_func, pDbname, 0, 0, pDbname);
}
/*
** Called by the parser to compile an ATTACH statement.
**
** ATTACH p AS pDbname KEY pKey
*/
void sqlite3Attach(Parse *pParse, Expr *p, Expr *pDbname, Expr *pKey){
static const FuncDef attach_func = {
3, /* nArg */
SQLITE_UTF8, /* funcFlags */
0, /* pUserData */
0, /* pNext */
attachFunc, /* xSFunc */
0, /* xFinalize */
0, 0, /* xValue, xInverse */
"sqlite_attach", /* zName */
{0}
};
codeAttach(pParse, SQLITE_ATTACH, &attach_func, p, p, pDbname, pKey);
}
#endif /* SQLITE_OMIT_ATTACH */
/*
** Expression callback used by sqlite3FixAAAA() routines.
*/
static int fixExprCb(Walker *p, Expr *pExpr){
DbFixer *pFix = p->u.pFix;
if( !pFix->bTemp ) ExprSetProperty(pExpr, EP_FromDDL);
if( pExpr->op==TK_VARIABLE ){
if( pFix->pParse->db->init.busy ){
pExpr->op = TK_NULL;
}else{
sqlite3ErrorMsg(pFix->pParse, "%s cannot use variables", pFix->zType);
return WRC_Abort;
}
}
return WRC_Continue;
}
/*
** Select callback used by sqlite3FixAAAA() routines.
*/
static int fixSelectCb(Walker *p, Select *pSelect){
DbFixer *pFix = p->u.pFix;
int i;
SrcItem *pItem;
sqlite3 *db = pFix->pParse->db;
int iDb = sqlite3FindDbName(db, pFix->zDb);
SrcList *pList = pSelect->pSrc;
if( NEVER(pList==0) ) return WRC_Continue;
for(i=0, pItem=pList->a; i<pList->nSrc; i++, pItem++){
if( pFix->bTemp==0 && pItem->fg.isSubquery==0 ){
if( pItem->fg.fixedSchema==0 && pItem->u4.zDatabase!=0 ){
if( iDb!=sqlite3FindDbName(db, pItem->u4.zDatabase) ){
sqlite3ErrorMsg(pFix->pParse,
"%s %T cannot reference objects in database %s",
pFix->zType, pFix->pName, pItem->u4.zDatabase);
return WRC_Abort;
}
sqlite3DbFree(db, pItem->u4.zDatabase);
pItem->fg.notCte = 1;
pItem->fg.hadSchema = 1;
}
pItem->u4.pSchema = pFix->pSchema;
pItem->fg.fromDDL = 1;
pItem->fg.fixedSchema = 1;
}
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
if( pList->a[i].fg.isUsing==0
&& sqlite3WalkExpr(&pFix->w, pList->a[i].u3.pOn)
){
return WRC_Abort;
}
#endif
}
if( pSelect->pWith ){
for(i=0; i<pSelect->pWith->nCte; i++){
if( sqlite3WalkSelect(p, pSelect->pWith->a[i].pSelect) ){
return WRC_Abort;
}
}
}
return WRC_Continue;
}
/*
** Initialize a DbFixer structure. This routine must be called prior
** to passing the structure to one of the sqliteFixAAAA() routines below.
*/
void sqlite3FixInit(
DbFixer *pFix, /* The fixer to be initialized */
Parse *pParse, /* Error messages will be written here */
int iDb, /* This is the database that must be used */
const char *zType, /* "view", "trigger", or "index" */
const Token *pName /* Name of the view, trigger, or index */
){
sqlite3 *db = pParse->db;
assert( db->nDb>iDb );
pFix->pParse = pParse;
pFix->zDb = db->aDb[iDb].zDbSName;
pFix->pSchema = db->aDb[iDb].pSchema;
pFix->zType = zType;
pFix->pName = pName;
pFix->bTemp = (iDb==1);
pFix->w.pParse = pParse;
pFix->w.xExprCallback = fixExprCb;
pFix->w.xSelectCallback = fixSelectCb;
pFix->w.xSelectCallback2 = sqlite3WalkWinDefnDummyCallback;
pFix->w.walkerDepth = 0;
pFix->w.eCode = 0;
pFix->w.u.pFix = pFix;
}
/*
** The following set of routines walk through the parse tree and assign
** a specific database to all table references where the database name
** was left unspecified in the original SQL statement. The pFix structure
** must have been initialized by a prior call to sqlite3FixInit().
**
** These routines are used to make sure that an index, trigger, or
** view in one database does not refer to objects in a different database.
** (Exception: indices, triggers, and views in the TEMP database are
** allowed to refer to anything.) If a reference is explicitly made
** to an object in a different database, an error message is added to
** pParse->zErrMsg and these routines return non-zero. If everything
** checks out, these routines return 0.
*/
int sqlite3FixSrcList(
DbFixer *pFix, /* Context of the fixation */
SrcList *pList /* The Source list to check and modify */
){
int res = 0;
if( pList ){
Select s;
memset(&s, 0, sizeof(s));
s.pSrc = pList;
res = sqlite3WalkSelect(&pFix->w, &s);
}
return res;
}
#if !defined(SQLITE_OMIT_VIEW) || !defined(SQLITE_OMIT_TRIGGER)
int sqlite3FixSelect(
DbFixer *pFix, /* Context of the fixation */
Select *pSelect /* The SELECT statement to be fixed to one database */
){
return sqlite3WalkSelect(&pFix->w, pSelect);
}
int sqlite3FixExpr(
DbFixer *pFix, /* Context of the fixation */
Expr *pExpr /* The expression to be fixed to one database */
){
return sqlite3WalkExpr(&pFix->w, pExpr);
}
#endif
#ifndef SQLITE_OMIT_TRIGGER
int sqlite3FixTriggerStep(
DbFixer *pFix, /* Context of the fixation */
TriggerStep *pStep /* The trigger step be fixed to one database */
){
while( pStep ){
if( sqlite3WalkSelect(&pFix->w, pStep->pSelect)
|| sqlite3WalkExpr(&pFix->w, pStep->pWhere)
|| sqlite3WalkExprList(&pFix->w, pStep->pExprList)
|| sqlite3FixSrcList(pFix, pStep->pSrc)
){
return 1;
}
#ifndef SQLITE_OMIT_UPSERT
{
Upsert *pUp;
for(pUp=pStep->pUpsert; pUp; pUp=pUp->pNextUpsert){
if( sqlite3WalkExprList(&pFix->w, pUp->pUpsertTarget)
|| sqlite3WalkExpr(&pFix->w, pUp->pUpsertTargetWhere)
|| sqlite3WalkExprList(&pFix->w, pUp->pUpsertSet)
|| sqlite3WalkExpr(&pFix->w, pUp->pUpsertWhere)
){
return 1;
}
}
}
#endif
pStep = pStep->pNext;
}
return 0;
}
#endif
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