Hibernate查询的各种方式效率比较

查询已知表名的实体时推荐使用getHibernateTemplate().executeWithNativeSession() + SQLQuery方式。

以下测试使用JUnit进行，仅查询一次，查询结果为5条记录。各种方式的详细代码及执行时间如下所示：

方式1，正常getHibernateTemplate().find()方式（183ms)：

List list = getHibernateTemplate()
.find(
"select o.id from  SfmFileIndex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime",
new Object[] { bussNo, typePath, "1" });

方式2，使用getHibernateTemplate().execute() + Query方式（214ms）：

List list = (List) getHibernateTemplate().execute(
new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
Query query = session.createQuery("select o.id from  SfmFileIndex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime");
query.setParameter(0, bussNo);
query.setParameter(1, typePath);
query.setParameter(2, "1");
return query.list();
}
});

方式3，使用getHibernateTemplate().executeWithNativeSession() + Query方式（184ms）：

List list = (List) getHibernateTemplate().executeWithNativeSession(
new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
Query query = session
.createQuery("select o.id from  SfmFileIndex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime");
query.setParameter(0, bussNo);
query.setParameter(1, typePath);
query.setParameter(2, "1");
return query.list();
}
});

方式4，使用getHibernateTemplate().execute() + SQLQuery方式（102ms）：

List list = (List) getHibernateTemplate().execute(
new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
SQLQuery query = session
.createSQLQuery("select o.id from  Sfm_FileIndex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime");
query.setParameter(0, bussNo);
query.setParameter(1, typePath);
query.setParameter(2, "1");
return query.list();
}
});

方式5，使用getHibernateTemplate().executeWithNativeSession() + SQLQuery方式（68ms）：

List list = (List) getHibernateTemplate().executeWithNativeSession(
new HibernateCallback() {
public Object doInHibernate(Session session)
throws HibernateException, SQLException {
SQLQuery query = session
.createSQLQuery("select o.id from  Sfm_FileIndex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime");
query.setParameter(0, bussNo);
query.setParameter(1, typePath);
query.setParameter(2, "1");
return query.list();
}
});

方式6，使用JDBC （用于比较，代码不够健壮）（37ms）：

PreparedStatement ps = getSession()
.connection()
.prepareStatement(
"select o.id from sfm_fileindex o where o.bussNo = ? and o.typePath = ? and o.validStatus = ? order by o.uploadTime");
ps.setString(1, bussNo);
ps.setString(2, typePath);
ps.setString(3, "1");
ResultSet rs = ps.executeQuery();
List list = new ArrayList();
while (rs.next()) {
list.add(new Long(rs.getLong(1)));
}
rs.close();
ps.close();