Hibernate中createQuery与createSQLQuery两者的区别
Struts has detected an unhandled exception:
Messages:
ORA-00933: SQL ???????
could not execute query
could not execute query; SQL [ select count(*) from www.csdn.weibo.domain.Pictures where 1=1 and picture_type='aaa'];
nested exception is org.hibernate.exception.SQLGrammarException: could not execute query
File: oracle/jdbc/driver/DatabaseError.java
Line number: 112
Stacktraces
org.springframework.dao.InvalidDataAccessResourceUsageException: could not execute query; SQL [ select count(*) from www.csdn.weibo.domain.Pictures
where 1=1 and picture_type='aaa']; nested exception is org.hibernate.exception.SQLGrammarException: could not execute query
在论坛发贴了，看到大家的回复我也改了改，还是没查询不到，于是乎请教老师吧，老师上来就看出问题了，唉唉，并且要我细看hibernate ，createQuery与createSQLQuery两者的区别，所以我先把我的错误展示给大家，然后再看他们的区别。
终于找到问题了 原来是把createQuery和createSQLQuery弄混了，在baseDaoImpl.java
里边我原来写的是
|
1
2
3
|
return
Integer.valueOf((session.createSQLQuery("
select count(*) from "
+ clazz.getName() + "
"+
whereSql).uniqueResult() + "")); |
在jsp中拼接sql语句中写的是
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
private
String spliceSql() {String
whereSql = "
where 1=1 ";if
(user != null
&& user.getId() != null
&& !"".equals(user.getId()))
{whereSql
+= "
and user_id="
+ user.getId() + "
";}if
(pictures != null
&& pictures.getType() != null&&
!"".equals(pictures.getType()))
{whereSql
+= "
and picture_type='"
+ pictures.getType() + "'";}return
whereSql;} |
应该改为这样的，
|
1
2
3
4
|
return
Integer.valueOf(session.createQuery("select
count(alias) from "
+ clazz.getName()+
"
as alias "+whereSql).uniqueResult()+
""); |
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
|
private
String spliceSql() {String
whereSql = "
where 1=1 ";if
(user != null
&& user.getId() != null
&& !"".equals(user.getId()))
{whereSql
+= "
and user_id="
+ user.getId() + "
";}if
(pictures != null
&& pictures.getType() != null&&
!"".equals(pictures.getType()))
{whereSql
+= "
and picture_type='"
+ pictures.getType() + "'";}return
whereSql;} |
createQuery与createSQLQuery区别 ：
前者以hibernate生成的Bean为对象装入list返回
后者则是以对象数组进行存储
所以使用createSQLQuery有时候也想以hibernate生成的Bean为对象装入list返回，就不是很方便
突然发现createSQLQuery有这样一个方法可以直接转换对象
Query query = session.createSQLQuery(sql).addEntity(XXXXXXX.class);
XXXXXXX 代表以hibernate生成的Bean的对象，也就是数据表映射出的Bean。
