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                |函數|返回值|說明| |-|-|-| |format( x , n )|將x格式化,并以四舍五入保留n位小數|浮點數格式化| |conv( N , from , to )|把N從from進制轉換為to進制|不同數字進制轉換| |inet_aton( str )|把str轉換成數字型ip地址111230254165|字符串轉數字IP| |inet_ntoa( num )|把num轉換成字符串ip地址111.230.254.165|數字轉字符串IP| |get_lock( str , time )|使用str獲取一個鎖,持續time秒|加鎖函數| |release_lock( str )|解除str的鎖,返回:成功解鎖1,超時0,否則返回空|解鎖函數| |is_free_lock( str )|檢查str的鎖存不存在,返回:不存在1,存在0|檢查鎖| |benchmark( count , expr )|重復count次執行expr|重復執行函數| |convert( str , set )|修改str的字符集為set|改變字符集| |cast( x as set )|修改x的數據類型為set { cast(100 as char(2)) }|改變數據類型|
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