在sqlite数据库中插入记录

Question

我有一个sqlite数据库，我想在其中插入行。我用过这段代码。

 -(void)InsertRecords{

      NSString *insertSQL = [NSString stringWithFormat:
                           @"INSERT INTO notes (id, title, content,dataAdd,category) VALUES (\"%@\", \"%@\", \"%@\" ,\"%@\",\"%@\")",
                           @"1",
                           @"mountain",
                           @"Prahova",
                           @"12.09.2019",
                           @"public"];

    const char *insert_stmt = [insertSQL UTF8String];
    sqlite3_stmt *updateStmt = nil;

    sqlite3_prepare_v2(contactDB, insert_stmt, -1, &statement, NULL);
    if(sqlite3_prepare_v2(contactDB, insert_stmt, -1, &statement, NULL) == SQLITE_OK){

    if (sqlite3_step(statement) == SQLITE_DONE)
    {
        NSLog(@"data inserted");

    }
    else{
        NSLog(@"Error while creating update statement. '%s'", sqlite3_errmsg(contactDB));

    }
    }
 else{
        NSLog(@"Error while creating update statement. '%s'", sqlite3_errmsg(contactDB));

    }

    sqlite3_finalize(statement);
    sqlite3_close(contactDB);
    }

并且它是日志：已插入数据。

当我这样做时：

querySQL1 = @"select id from notes where category LIKE 'public'";
    const char *query_stmt = [querySQL1 UTF8String];

    sqlite3_prepare_v2(contactDB, query_stmt, -1, &statement, NULL);

    NSString *idNr;
    while (sqlite3_step(statement) == SQLITE_ROW)
    {
        idNr =[[NSString alloc] initWithUTF8String:
                     (const char *) sqlite3_column_text(statement, 0)];

    }

    NSLog(@"%@",idNr);

idNr为空。

ANy ideea发生了什么？任何帮助将不胜感激。感谢。