为什么数据库没有创建？

Question

我尝试在我的应用中使用sqlite3.0创建数据库，但数据库尚未创建。这是我的代码：

     // Getting the documents directory
    dirPaths = NSSearchPathForDirectoriesInDomains(
                                                   NSDocumentDirectory, NSUserDomainMask, YES);

    docsDir = dirPaths[0];

    // Built the path to the database file
    _databasePath = [[NSString alloc]
                     initWithString: [docsDir stringByAppendingPathComponent:
                                      @"contacts1.db"]];//here the database name is contacts1.db.

    NSFileManager *filemgr = [NSFileManager defaultManager];

    if ([filemgr fileExistsAtPath: _databasePath ] == NO)//checking Database exists
    {
        const char *dbpath = [_databasePath UTF8String];

        if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
        {
            char *errMsg;
            const char *sql_stmt =
            "CREATE TABLE IF NOT EXISTS CONTACTS1 (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, ADDRESS TEXT, PHONE TEXT)";

            if (sqlite3_exec(_contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
            {
            }
            sqlite3_close(_contactDB);
        } 
    }

我不是什么错误？我已经在ViewDidload（）

中实现了代码

Answer 1

尝试检查你的情况

NSArray *directories = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *doctumentsDirectory = [directories lastObject];
    self.databasePath = [[NSString alloc] initWithString:[doctumentsDirectory stringByAppendingPathComponent:@"/contacts1.db"]];

    NSFileManager *fileManager = [NSFileManager defaultManager];


    if (![filemgr fileExistsAtPath: _databasePath ])//checking Database exists
        {
            const char *dbpath = [_databasePath UTF8String];

            if (sqlite3_open(dbpath, &_contactDB) == SQLITE_OK)
            {
                char *errMsg;
                const char *sql_stmt =
                "CREATE TABLE IF NOT EXISTS CONTACTS1 (ID INTEGER PRIMARY KEY AUTOINCREMENT, NAME TEXT, ADDRESS TEXT, PHONE TEXT)";

                if (sqlite3_exec(_contactDB, sql_stmt, NULL, NULL, &errMsg) != SQLITE_OK)
                {
                }
                sqlite3_close(_contactDB);
            } 
        }