因为很久没写过存储过程了，语法也不记得了，靠百度后，解决了当前问题，这里就简单记录一下。

CREATE PROCEDURE pro1()
       BEGIN
         DECLARE i int;
         DECLARE dbName VARCHAR(40);
         SET i = 0;
         while i<5 do
           SET dbName = concat('table_',i);
           set @sqlStr=CONCAT('insert into temp_table SELECT a,b from ',dbName,' WHERE c in ("")');
            PREPARE stmt from @sqlStr;
            EXECUTE stmt;
           set i=i+1;
         end while;
       END;

CALL pro1();

DROP PROCEDURE pro1;