mysql——convert函數

參考博客： https://www.cnblogs.com/chenqionghe/p/4675844.html

CAST(x AS type)

CONVERT(x,type)

這兩個函數只對BINARY、CHAR、DATE、DATETIME、TIME、SIGNED INTEGER、UNSIGNED INTEGER。

SELECT CAST('123' AS UNSIGNED INTEGER) + 1
    ->124

SELECT '123' + 1
    ->124 其實MySQL能默認轉換

SELECT CAST(NOW() AS DATE)
　　->2014-12-18

 

例如：

數據庫中user表中 magicstr字段是16進制字符 轉換成10進制 再被sha1編碼

update sigma_account_us_user set `password`= SHA1(CONVERT( magicstr, SIGNED )) where id=467450