mysql Split函数

mysql没有split函数，这里手动写一个：

CREATE  PROCEDURE sp_split(in c1 varchar(2000),in split1 varchar(20))
BEGIN
CREATE TEMPORARY TABLE IF NOT EXISTS temp_split
(
   col varchar(20)
);
DELETE FROM temp_split;
while(instr(c1,split1)<>0) DO
insert temp_split(col) values (substring(c1,1,instr(c1,split1)-1));
set c1 = INSERT(c1,1,instr(c1,split1),'');
END WHILE;
insert temp_split(col) values (c1); 
END;

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