iphone：在我的SQLite數據庫的表中創建一個查詢

Question

，有一個名爲域ID，名字，中間，姓氏

現在我想要運行的查詢如下

MyQuery = [NSString stringWithFormat:@"select id,(firstName || middlename || lastname) as Name from Students where firstname like '%@' or middlename like '%@' or lastname like '%@'",searchBarString,searchBarString,searchBarString]; 

上面的查詢工作做好。但我想在第一個和中間名（也是中間姓）之間添加一個空格。所以我該如何執行這個任務？請建議

Answer 1

MyQuery = [NSString stringWithFormat:@"select id,(firstName || ' ' || middlename || ' ' || lastname) as Name from Students where firstname like '%@' or middlename like '%@' or lastname like '%@'",searchBarString,searchBarString,searchBarString]; 

試試這個！

Answer 2

你可以簡單地在不同的變量返回三個列，然後加入他們顯示他們的時候：

NSString *lastName = ...; 
NSString *middleName = ...; 
NSString *firstName = ...; 

NSString *joined = [NSString stringWithFormat:@"%@ %@ %@",lastName,middleName,firstName]; 

這樣做的好處是，你可以通過任何UI中的三列未做排序新的SQLite查詢，並允許用戶編輯這些。