User already exist!

用户已存在！

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The next section of code determines if the user is new or not, and either selects the user's ID from the database if they already exist, or adds it to the database if they do not.

下面一段代码确定用户是否为新用户，如果用户ID已存在，那么从数据库中选择用户ID，否则，将用户ID添加到数据库。

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If the user name already exists, the DB2 Setup wizard appends a number from 1-99 to the default user name, until a user ID that does not already exist can be created.

如果该用户名已经存在，DB 2安装向导就会在默认的名称后面增加一个1 - 99的数字，直到遇到一个不存在的用户ID。

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Its approach involves detecting a phone user's location in a building using Wi-Fi signals that already exist inside the building.

WSJ: Apple Buys Indoor GPS Specialist

Mood-tracking apps already exist but the team from the Cambridge Computer Laboratory think this is the first time that user-input data and phone information sources have been combined.

BBC: App taps phone and personal clues to your happiness