如何检查天气the是否在数据库中显示? [英] how to check weather the sting is presented in database or not?

问题描述

大家好..我正在做一个小项目，准备学生注册和登录表格..为此，我要限制数据库中已经存在的用户名.有人可以帮我吗?

在此先感谢...

Hi all.. am doing a small project for doing the student registration and login form.. for this i have to do is, to restrict the username which is already in the database. can anyone please help me in doing this.

thanks in advance...

推荐答案

使用此方法:

use this method:

public Cursor query(....)

请参阅此示例
http://www.higherpass.com/Android/Tutorials/Accessing-Data -With-Android-Cursors/2/ [

see this example
http://www.higherpass.com/Android/Tutorials/Accessing-Data-With-Android-Cursors/2/[^]

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