mysql语句中的冒号是什么意思？

mysql语句中的冒号是什么意思？

回复讨论(解决方案)

$db->bandVars();  传递值 
echo $check_query;   就知道了。

可以看看手册的pdo类

<?php/* Execute a prepared statement by binding PHP variables */$calories = 150;$colour = 'red';$sth = $dbh->prepare('SELECT name, colour, calories    FROM fruit    WHERE calories < :calories AND colour = :colour');$sth->bindParam(':calories', $calories, PDO::PARAM_INT);$sth->bindParam(':colour', $colour, PDO::PARAM_STR, 12);$sth->execute();?> 

没有别的意思符号而已，以便区别于 sql 的语法成分
bindVars 方法将定义的符号与实际的变量关联起来

Example #1 Execute a prepared statement with named placeholders<?php/* Execute a prepared statement by binding PHP variables */$calories = 150;$colour = 'red';$sth = $dbh->prepare('SELECT name, colour, calories    FROM fruit    WHERE calories < :calories AND colour = :colour');$sth->bindParam(':calories', $calories, PDO::PARAM_INT);$sth->bindParam(':colour', $colour, PDO::PARAM_STR, 12);$sth->execute();?>Example #2 Execute a prepared statement with question mark placeholders<?php/* Execute a prepared statement by binding PHP variables */$calories = 150;$colour = 'red';$sth = $dbh->prepare('SELECT name, colour, calories    FROM fruit    WHERE calories < ? AND colour = ?');$sth->bindParam(1, $calories, PDO::PARAM_INT);$sth->bindParam(2, $colour, PDO::PARAM_STR, 12);$sth->execute();?>

大神，以下mysql 语句用来查询排名，在Mysql 中能执行，但是S2SH 框架中就不行，你能指点一下吗？
select t.*,@rownum:=@rownum+1 AS rownum  
from (SELECT sum(yjb_yji)  as total,yyryusername,yjb_yyry_id  
FROM yjb where  month(createtime) =month(now()) and year(createtime)=year(now())
 group by yjb_yyry_id order by total desc) t,(SELECT @rownum:=0) r 

报此bug: org.hibernate.QueryException: Space is not allowed after parameter prefix ':'