http://www.snooda.com/index zh-cn http://www.snooda.com/read/ snooda <admin@snooda.com> Mon, 07 Dec 2015 11:22:14 +0000 http://www.snooda.com/read/

    可以通过mysql官方文档来看：
    http://dev.mysql.com/doc/refman/5.0/en/char.html
    

The CHAR and VARCHAR types are declared with a length that indicates the maximum number of characters you want to store. For example, CHAR(30) can hold up to 30 characters.

    即支持的是30个字符（characters），而不是30字节（bytes）

    经测试，结果也是符合文档的。varchar(30)可以存储30个汉字


    附加问题：如果传入了超出长度的内容，会有什么结果。

If strict SQL mode is not enabled and you assign a value to a CHAR or VARCHAR column that exceeds the column's maximum length, the value is truncated to fit and a warning is generated.

     文档中提到。默认情况下会截断而不返回错误。如果需要返回错误，需要开启strict mode











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