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Add untested implementations of experimental APIs sqlite3_snapshot_get(), _open() and _free().

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FossilOrigin-Name: 0715eb00aa8891400cd50a15509d3d7b13789626
This commit is contained in:
dan
2015-12-05 20:51:54 +00:00
parent 28a6a1168b
commit fc1acf33b8
9 changed files with 320 additions and 18 deletions
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82
src/main.c
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@@ -3866,3 +3866,85 @@ int sqlite3_db_readonly(sqlite3 *db, const char *zDbName){
pBt = sqlite3DbNameToBtree(db, zDbName);
return pBt ? sqlite3BtreeIsReadonly(pBt) : -1;
}
#ifdef SQLITE_ENABLE_SNAPSHOT
/*
** Obtain a snapshot handle for the snapshot of database zDb currently
** being read by handle db.
*/
int sqlite3_snapshot_get(
sqlite3 *db,
const char *zDb,
sqlite3_snapshot **ppSnapshot
){
int rc = SQLITE_ERROR;
#ifndef SQLITE_OMIT_WAL
int iDb;
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
iDb = sqlite3FindDbName(db, zDb);
if( iDb==0 || iDb>1 ){
Btree *pBt = db->aDb[iDb].pBt;
if( 0!=sqlite3BtreeIsInReadTrans(pBt)
&& 0==sqlite3BtreeIsInTrans(pBt)
){
rc = sqlite3PagerSnapshotGet(sqlite3BtreePager(pBt), ppSnapshot);
}
}
sqlite3_mutex_leave(db->mutex);
#endif /* SQLITE_OMIT_WAL */
return rc;
}
/*
** Open a read-transaction on the snapshot idendified by pSnapshot.
*/
int sqlite3_snapshot_open(
sqlite3 *db,
const char *zDb,
sqlite3_snapshot *pSnapshot
){
int rc = SQLITE_ERROR;
#ifndef SQLITE_OMIT_WAL
#ifdef SQLITE_ENABLE_API_ARMOR
if( !sqlite3SafetyCheckOk(db) ){
return SQLITE_MISUSE_BKPT;
}
#endif
sqlite3_mutex_enter(db->mutex);
if( db->autoCommit==0 ){
int iDb;
iDb = sqlite3FindDbName(db, zDb);
if( iDb==0 || iDb>1 ){
Btree *pBt = db->aDb[iDb].pBt;
if( 0==sqlite3BtreeIsInReadTrans(pBt) ){
rc = sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), pSnapshot);
if( rc==SQLITE_OK ){
rc = sqlite3BtreeBeginTrans(pBt, 0);
sqlite3PagerSnapshotOpen(sqlite3BtreePager(pBt), 0);
}
}
}
}
sqlite3_mutex_leave(db->mutex);
#endif /* SQLITE_OMIT_WAL */
return rc;
}
/*
** Free a snapshot handle obtained from sqlite3_snapshot_get().
*/
void sqlite3_snapshot_free(sqlite3_snapshot *pSnapshot){
sqlite3_free(pSnapshot);
}
#endif /* SQLITE_ENABLE_SNAPSHOT */