Hibernate中createQuery与createSQLQuery两者的区别

最近几天在写项目，遇到了一个错：

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

return Integer.valueOf((session.createSQLQuery(
" select count(*) from " + clazz.getName() + " "
+ whereSql).uniqueResult() + "" ));

在jsp中拼接sql语句中写的是

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，

return Integer.valueOf(session.createQuery(
"select count(alias) from " + clazz.getName()
+ " as alias " +whereSql).uniqueResult()
+ "" );

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;

}

下面是从网上找的很有用：

createQuery与createSQLQuery区别 ：

前者用的hql语句进行查询，后者可以用sql语句查询
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。