ios- sqLite not deleting rows - ios

Question

I am trying to delete all the rows in database for that I wrote following codes ..
- (id)init {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *databasePath = [documentsDirectory stringByAppendingPathComponent:#"dataBase.sqlite3"];
bool databaseAlreadyExists = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];
if (!databaseAlreadyExists){
NSString *databasePathFromApp = [[NSBundle mainBundle] pathForResource:#"dataBase" ofType:#"sqlite3"];
[[NSFileManager defaultManager] copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
}
if (sqlite3_open([databasePath UTF8String], &_database) == SQLITE_OK){
}
return self;
}
-(void)deleteAll{
NSString *query = #"DELETE FROM user_info";
sqlite3_stmt *statement = nil;
if (sqlite3_prepare_v2(_database, [query UTF8String], -1, &statement, nil) == SQLITE_OK) {
NSLog(#"Should delete..");
}
sqlite3_finalize(statement);
sqlite3_close(_database);
}
But when I rebuild the app data data appears. Whats wrong I am doing?

Answer 1

You never call sqlite3_step to actually execute the query.
Also, you close the database in the wrong place. Your close should be done opposite of the open.

Answer 2

First of all, get the database path after that open database
NSString *dbPath1=[SqliteManager getDataBasePath];
if (sqlite3_open([dbPath1 UTF8String], &database) == SQLITE_OK)
{
NSLog(#"opened the data base");
const char *sql = "delete from travels";
if(sqlite3_prepare_v2(database, sql, -1, &deletestmt, NULL) == SQLITE_OK)
if(SQLITE_DONE != sqlite3_step(deletestmt))
NSAssert1(0, #"Error while deleting. '%s'", sqlite3_errmsg(database));
else
isdeleted=YES;
}
sqlite3_reset(deletestmt);
sqlite3_close(database);
write in ur method inside.....
Getting Database Path....
+(NSString *)getDataBasePath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory , NSUserDomainMask, YES);
NSString *documentsDir = [paths objectAtIndex:0];
NSLog(#"file Path is %#",documentsDir);
return [documentsDir stringByAppendingPathComponent:#"Give ur Sqlite Filename"];
}

Answer 3

Try a conditional if:
if(sqlite3_prepare_v2(database, sql, -1, &deletestmt, NULL) != SQLITE_OK)