MySQL 自定义函数CREATE FUNCTION示例
mysql>
mysql>delimiter$$
mysql>
mysql>CREATEFUNCTIONmyFunction
->(in_stringVARCHAR(255),
->in_find_strVARCHAR(20),
->in_repl_strVARCHAR(20))
->
->RETURNSVARCHAR(255)
->BEGIN
->DECLAREl_new_stringVARCHAR(255);
->DECLAREl_find_posINT;
->
->SETl_find_pos=INSTR(in_string,in_find_str);
->
->IF(l_find_pos>0)THEN
->SETl_new_string=INSERT(in_string,l_find_pos,LENGTH(in_find_str),in_repl_str);
->ELSE
->SETl_new_string=in_string;
->ENDIF;
->RETURN(l_new_string);
->
->END$$
QueryOK,0rowsaffected(0.00sec)
mysql>
mysql>delimiter;
mysql>selectmyFunction('ABC','A','Z');
+---------------------------+
|myFunction('ABC','A','Z')|
+---------------------------+
|ZBC|
+---------------------------+
1rowinset(0.00sec)
mysql>dropfunctionmyFunction;
QueryOK,0rowsaffected(0.00sec)热门推荐
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