My Update statement is not working - objective-c

Question

I tried to update an entry in my table like this:
NSFileManager *fileMgr=[NSFileManager defaultManager];
NSString *dbPath=[[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:#"quizDB.sqlite"];
if ([fileMgr fileExistsAtPath:dbPath]) {
NSLog(#"DB does exist!");//displayed
}
const char *dbpath = [dbPath UTF8String];
sqlite3_stmt *updateStmt;
if (sqlite3_open(dbpath, &contactDB) == SQLITE_OK)
{
NSLog(#"%i",id_quiz);//displayed, in a test case it display 1 which is a quiz ID in the table
NSString *querySql=[NSString stringWithFormat:#"Update quiz set etat=1 where id=\"%i\"",id_quiz];
const char*sql=[querySql UTF8String];
sqlite3_prepare_v2(contactDB, sql, -1, &updateStmt, NULL);
if(SQLITE_DONE != sqlite3_step(updateStmt))
{
NSAssert1(0, #"Error while updating. '%s'", sqlite3_errmsg(contactDB));
}
else{
sqlite3_reset(updateStmt);
NSLog(#"Update done successfully!");//this is also displayed, i guess everything is ok then and the entry is updated
}
sqlite3_finalize(updateStmt);
sqlite3_close(contactDB);
}
In the log, i got the message: Update done successfully! so i assumed that everything is, however when i check the database within SQLite Manager in Mozilla Firefox, the entry is not updated. Am i missing something? thanx for help

Answer 1

first copy your database from resource to document dir:
- (void) checkAndCreateDatabase
{
NSString *database_Name =#"quizDB.sqlite"
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *database_Path = [documentsDir stringByAppendingPathComponent:database_Name];
NSFileManager *fileManager = [NSFileManager defaultManager];
if(![fileManager fileExistsAtPath:database_Path])
{
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:database_Name];
[fileManager removeItemAtPath:database_Path error:nil];
[fileManager copyItemAtPath:databasePathFromApp toPath:database_Path error:nil];
}
else
{
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:database_Name];
[fileManager copyItemAtPath:databasePathFromApp toPath:database_Path error:nil];
}
}
and after you update your database:
- (void) UpdateDatabase
{
sqlite3 *contactDB;
sqlite3_stmt *updateStmt;
NSString *database_Name =#"quizDB.sqlite"
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
NSString *dbpath = [documentsDir stringByAppendingPathComponent:database_Name];
if(sqlite3_open([dbpath UTF8String], &contactDB) == SQLITE_OK)
{
NSString *querySql=[NSString stringWithFormat:#"Update quiz set etat=1 where id=\"%i\"",id_quiz];
const char*sql=[querySql UTF8String];
if(sqlite3_prepare_v2(contactDB,sql, -1, &updateStmt, NULL) == SQLITE_OK)
{
if(SQLITE_DONE != sqlite3_step(updateStmt))
{
NSAssert1(0, #"Error while updating. '%s'", sqlite3_errmsg(contactDB));
}
else{
sqlite3_reset(updateStmt);
NSLog(#"Update done successfully!");
}
}
sqlite3_finalize(updateStmt);
}
sqlite3_close(contactDB);
}
and check your database which save in documentdir not in resource