Question

-(void)defaultValueAddingIntoDatabase
{
dirPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
documentDir = [dirPath objectAtIndex:0];
databasePath=[[NSString alloc]initWithString:[documentDir stringByAppendingPathComponent:@"drumloops.db"]];
//    NSLog(@"datbase path :%@",databasePath);
filemanager= [NSFileManager defaultManager];
if([filemanager fileExistsAtPath:databasePath] == YES)
{
    const char *dbPath=[databasePath UTF8String];
    if(sqlite3_open(dbPath,&_myDatabase)==SQLITE_OK)
    {
        NSLog(@"DATABASE IS OPEN");
    }
}
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &_myDatabase) == SQLITE_OK)
{
    char *errMsg;
    const char *sql_stmt="CREATE TABLE IF NOT EXISTS drum(ID INTEGER PRIMARY KEY AUTOINCREMENT,name TEXT,speed TEXT,track TEXT,audio TEXT)";
    if(sqlite3_exec(_myDatabase, sql_stmt, NULL, NULL, &errMsg)!= SQLITE_OK)
    {
 //            NSLog(@"drum TABLE id failed to create");
    }
    else
    {
        NSLog(@"drum table is created");
    }
}
sqlite3_stmt *statement;
if(sqlite3_open(dbpath,&_myDatabase)==SQLITE_OK)
{
    NSString *insertQuery;
        insertQuery=[NSString stringWithFormat:@"Insert into drum (name,speed,track,audio) SELECT 'JAZZ','1','1','JAZZ1' UNION SELECT 'JAZZ','1','2','JAZZ2' UNION SELECT 'JAZZ','1','3','JAZZ3' UNION SELECT 'JAZZ','1','4','JAZZ4' UNION SELECT 'JAZZ','1','5','JAZZ5' UNION SELECT 'JAZZ','1','6','JAZZ6' UNION SELECT 'JAZZ','1','7','JAZZ7' UNION SELECT 'JAZZ','1','8','JAZZ8' UNION SELECT 'JAZZ','1','9','JAZZ9' UNION SELECT 'JAZZ','1','10','JAZZ10' UNION SELECT 'JAZZ','1','11','JAZZ11' UNION SELECT 'JAZZ','1','12','JAZZ12' UNION SELECT 'JAZZ','1','13','JAZZ13' UNION SELECT 'JAZZ','1','14','JAZZ14' UNION SELECT 'ROCK','1','1','ROCK1' UNION SELECT 'ROCK','1','2','ROCK2' UNION SELECT 'ROCK','1','3','ROCK3' UNION SELECT 'ROCK','1','4','ROCK4' UNION SELECT 'ROCK','1','5','ROCK5' UNION SELECT 'ROCK','1','6','ROCK6' UNION SELECT 'ROCK','1','7','ROCK7' UNION SELECT 'ROCK','1','8','ROCK8' UNION SELECT 'ROCK','1','9','ROCK9' UNION SELECT 'ROCK','1','10','ROCK10' UNION SELECT 'ROCK','1','11','ROCK11' UNION SELECT 'ROCK','1','12','ROCK12' UNION SELECT 'ROCK','1','13','ROCK13' UNION SELECT 'ROCK','1','14','ROCK14' UNION SELECT 'ROCK','1','15','ROCK15' UNION SELECT 'ROCK','1','16','ROCK16' UNION SELECT 'ROCK','1','17','ROCK17' UNION SELECT 'ROCK','1','18','ROCK18' UNION SELECT 'ROCK','1','19','ROCK19' UNION SELECT 'ROCK','1','20','ROCK20' UNION SELECT 'ROCK','1','21','ROCK21' UNION SELECT 'ROCK','1','22','ROCK22' UNION SELECT 'POP','1','1','POP1' UNION SELECT 'POP','1','2','POP2' UNION SELECT 'POP','1','3','POP3' UNION SELECT 'POP','1','4','POP4' UNION SELECT 'POP','1','5','POP5' UNION SELECT 'POP','1','6','POP6' UNION SELECT 'POP','1','7','POP7' UNION SELECT 'POP','1','8','POP8' UNION SELECT 'POP','1','9','POP9' UNION SELECT 'POP','1','10','POP10' UNION SELECT 'POP','1','11','POP11' UNION SELECT 'POP','1','12','POP12' UNION SELECT 'POP','1','13','POP13' UNION SELECT 'POP','1','14','POP14' UNION SELECT 'POP','1','15','POP15' UNION SELECT 'POP','1','16','POP16' UNION SELECT 'POP','1','17','POP17' UNION SELECT 'POP','1','18','POP18' UNION SELECT 'HIPHOP','1','1','HIPHOP1' UNION SELECT 'HIPHOP','1','2','HIPHOP2' UNION SELECT 'HIPHOP','1','3','HIPHOP3' UNION SELECT 'HIPHOP','1','4','HIPHOP4' UNION SELECT 'HIPHOP','1','5','HIPHOP5' UNION SELECT 'HIPHOP','1','6','HIPHOP6' UNION SELECT 'HIPHOP','1','7','HIPHOP7' UNION SELECT 'HIPHOP','1','8','HIPHOP8' UNION SELECT 'HIPHOP','1','9','HIPHOP9' UNION SELECT 'HIPHOP','1','10','HIPHOP10' UNION SELECT 'HIPHOP','1','11','HIPHOP11' UNION SELECT 'HIPHOP','1','12','HIPHOP12' UNION SELECT 'HIPHOP','1','13','HIPHOP13' UNION SELECT 'HIPHOP','1','14','HIPHOP14' UNION SELECT 'HIPHOP','1','15','HIPHOP15' UNION SELECT 'HIPHOP','1','16','HIPHOP16' UNION SELECT 'HIPHOP','1','17','HIPHOP17' UNION SELECT 'HIPHOP','1','18','HIPHOP18'"];




    const char *insert_stmt=[insertQuery UTF8String];
    BOOL sucess=sqlite3_prepare_v2(_myDatabase, insert_stmt, -1, &statement, NULL);
    if(sucess==SQLITE_OK)
    {
//            NSLog(@"prepared");
    }
    if(sqlite3_step(statement)==SQLITE_DONE)
    {
//            NSLog(@"inserted succesfully");
        [[NSUserDefaults standardUserDefaults] setInteger:1 forKey:@"HasLaunchedOnce"]; //first time app set Value Yes than always be YES
        [[NSUserDefaults standardUserDefaults] synchronize];
    }
    else
    {
        NSLog(@"not insertd into drum");
        UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Error !" message:@"Relaunch application" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
    }
    sqlite3_finalize(statement);
    sqlite3_close(_myDatabase);
}
}

当应用程序第一次启动上面的方法时调用并触发数据库查询并创建新的数据库和表

数据库值未在sqlite中插入数据库数据库的最新值不会出现在tableview中上面插入数据库的方法

和从数据库中获取的belove方法

 dirPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
documentDir=dirPath[0];
//    NSLog(@"doc dir path is %@",documentDir);
databasePath=[[NSString alloc]initWithString:[documentDir stringByAppendingPathComponent:@"drumloops.db"]];
//    NSLog(@"datbase path :%@",databasePath);
filemanager= [NSFileManager defaultManager];

const char *dbpath = [databasePath UTF8String];
sqlite3_stmt    *statement;
if (sqlite3_open(dbpath, &_myDatabase) == SQLITE_OK)
{
 //        NSString *querySQL = [NSString stringWithFormat:@"SELECT audio FROM drum where name='%@' ",selectedButtonName];
    NSString *querySQL = [NSString stringWithFormat:@"SELECT audio FROM drum WHERE name='%@' AND speed='%lu'",selectedButtonName, (unsigned long)selectedSpeed];
    const char *query_stmt = [querySQL UTF8String];
    if (sqlite3_prepare_v2(_myDatabase, query_stmt, -1, &statement, NULL) == SQLITE_OK)
    {
        while (sqlite3_step(statement) == SQLITE_ROW)
        {
            NSString *audio = [[NSString alloc] initWithUTF8String: (const char *) sqlite3_column_text(statement, 0)];
 //                NSLog(@"audio %@",audio);
            [self.fetchAudio addObject:audio];
        }
        sqlite3_finalize(statement);
        sqlite3_close(_myDatabase);
 //            NSLog(@"speed :%@",fetchAudio);

        sortedAudioArray = [fetchAudio sortedArrayUsingComparator:^(id a, id b) {
            return [a compare:b options:NSNumericSearch];
        }];
//            NSLog(@"sortedAudioArray :%@",sortedAudioArray);
      }
}

上述方法无法获取值谢谢......

已创建Sqlite 3数据库但插入查询未在ios中触发

0 个答案: