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Add support for the "memdb" VFS and the sqlite3_memdb_ptr() and

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sqlite3_memdb_config() interfaces, to enable an SQLite database to be
manipulated as an in-memory object.

FossilOrigin-Name: fb2ac2d2fa6374084f3325b41b257c7a3ace43aade4b666ec4be93b6b70dc39a
This commit is contained in:
drh
2018-01-03 01:28:46 +00:00
parent d9620b8555
commit ac442f41c1
14 changed files with 710 additions and 37 deletions
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77
src/tclsqlite.c
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@@ -1852,14 +1852,13 @@ static int SQLITE_TCLAPI DbObjCmd(
"complete", "copy", "enable_load_extension",
"errorcode", "eval", "exists",
"function", "incrblob", "interrupt",
"last_insert_rowid", "nullvalue", "onecolumn",
"preupdate", "profile", "progress",
"rekey", "restore", "rollback_hook",
"status", "timeout", "total_changes",
"trace", "trace_v2", "transaction",
"unlock_notify", "update_hook", "version",
"wal_hook",
0
"last_insert_rowid", "memdb", "nullvalue",
"onecolumn", "preupdate", "profile",
"progress", "rekey", "restore",
"rollback_hook", "status", "timeout",
"total_changes", "trace", "trace_v",
"transaction", "unlock_notify", "update_hook",
"version", "wal_hook", 0
};
enum DB_enum {
DB_AUTHORIZER, DB_BACKUP, DB_BUSY,
@@ -1868,13 +1867,13 @@ static int SQLITE_TCLAPI DbObjCmd(
DB_COMPLETE, DB_COPY, DB_ENABLE_LOAD_EXTENSION,
DB_ERRORCODE, DB_EVAL, DB_EXISTS,
DB_FUNCTION, DB_INCRBLOB, DB_INTERRUPT,
DB_LAST_INSERT_ROWID, DB_NULLVALUE, DB_ONECOLUMN,
DB_PREUPDATE, DB_PROFILE, DB_PROGRESS,
DB_REKEY, DB_RESTORE, DB_ROLLBACK_HOOK,
DB_STATUS, DB_TIMEOUT, DB_TOTAL_CHANGES,
DB_TRACE, DB_TRACE_V2, DB_TRANSACTION,
DB_UNLOCK_NOTIFY, DB_UPDATE_HOOK, DB_VERSION,
DB_WAL_HOOK,
DB_LAST_INSERT_ROWID, DB_MEMDB, DB_NULLVALUE,
DB_ONECOLUMN, DB_PREUPDATE, DB_PROFILE,
DB_PROGRESS, DB_REKEY, DB_RESTORE,
DB_ROLLBACK_HOOK, DB_STATUS, DB_TIMEOUT,
DB_TOTAL_CHANGES, DB_TRACE, DB_TRACE_V2,
DB_TRANSACTION, DB_UNLOCK_NOTIFY, DB_UPDATE_HOOK,
DB_VERSION, DB_WAL_HOOK
};
/* don't leave trailing commas on DB_enum, it confuses the AIX xlc compiler */
@@ -2667,6 +2666,54 @@ static int SQLITE_TCLAPI DbObjCmd(
break;
}
/*
** $db memdb DATABASE ?BLOB?
**
** Set or query the content of a MEMDB database.
**
*/
case DB_MEMDB: {
#ifndef SQLITE_ENABLE_MEMDB
Tcl_AppendResult(interp, "MEMDB not available in this build",
(char*)0);
rc = TCL_ERROR;
#else
const char *zSchema = Tcl_GetString(objv[2]);
sqlite3_int64 sz = 0;
unsigned char *pData;
if( objc==3 ){
pData = sqlite3_memdb_ptr(pDb->db, zSchema, &sz);
if( pData==0 ){
Tcl_AppendResult(interp, "not a MEMDB database", (char*)0);
rc = TCL_ERROR;
}else{
Tcl_SetObjResult(interp, Tcl_NewByteArrayObj(pData,sz));
}
}else if( objc==4 ){
int len = 0, xrc;
unsigned char *pBA = Tcl_GetByteArrayFromObj(objv[3], &len);
pData = sqlite3_malloc64( len );
if( pData==0 ){
Tcl_AppendResult(interp, "out of memory", (char*)0);
rc = TCL_ERROR;
}else{
memcpy(pData, pBA, len);
xrc = sqlite3_memdb_config(pDb->db, zSchema, pData, len, len,
SQLITE_MEMDB_FREEONCLOSE|SQLITE_MEMDB_RESIZEABLE);
if( xrc ){
sqlite3_free(pData);
Tcl_AppendResult(interp, "unable to set MEMDB content", (char*)0);
rc = TCL_ERROR;
}
}
}else{
Tcl_WrongNumArgs(interp, 2, objv, "?SCRIPT?");
rc = TCL_ERROR;
}
#endif
break;
}
/*
** $db nullvalue ?STRING?
**