在MySQL中拼SQL语句

例子如下：

CREATE TEMPORARY TABLE NEW_TIME_CLIENT(UUID VARCHAR(36), CLIENT_MAC VARCHAR(17), ONLINE_SECONDS INT)

ENGINE=MEMORY;

SET @SQL_NEW_TIME_CLIENT=CONCAT("

INSERT INTO NEW_TIME_CLIENT

SELECT UUID, SUBSTRING(RVALUE,1,17) CLIENT_MAC, SUBSTRING(RVALUE,19) ONLINE_SECONDS FROM

(

SELECT * FROM VALUE_DETAIL_5_42_",@CUR_DAY,"

WHERE RPTTIME BETWEEN '",@TIME1,"' AND '",@TIME2,"') R

WHERE RITEM LIKE 'client%';");

PREPARE SQL_NEW_TIME_CLIENT FROM @SQL_NEW_TIME_CLIENT;

EXECUTE SQL_NEW_TIME_CLIENT;