2012-12-14 16:38 hibernate 实体映射文件中 写 hql/sql 语句

在使用Hibernate做开发时，可以直接在源代码里写 HQL/SQL，也可以利用hibernate 实体映射文件中写HQL/SQL

下面介绍在实体映射文件中写HQL/SQL

实体映射文件: user.hbm.xml

< hibernate-mapping >
    < class  name = "org.tie.User"  table = "user"  catalog = "tie" >
        < id  name = "id"  type = "long" >
            < column  name = "id"  />
            < generator  class = "native"  />
        </ id >
        < property  name = "name"  type = "string" >
            < column  name = "name"  length = "45"  not-null = "true"  />
        </ property >
        < property  name = "age"  type = "integer" >
            < column  name = "age"  not-null = "true"  />
        </ property >
        < property  name = "addr"  type = "string" >
            < column  name = "addr"  length = "45"  not-null = "true"  />
        </ property >
    </ class >
    <!-- 这里将Hql语句写到配置文件当中，名字是可以随便取的 -->
    < query  name = "getUserInfo" >
        from User where addr=:address and age=:age
    </ query >
</ hibernate-mapping >

hibernate配置文件：hibernate.cfg.xml

<xml version= "1.0" ?>
    <DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >
<hibernate-configuration>
    <session-factory>
        <mapping resource= "User.hbm.xml" />
    <session-factory>
<hibernate-configuration>

java代码:

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/* * 另外Hibernate允许我们把 sql语句配置到文件中 * 因为写到程序中需要编译的，而写到配置文件中是不需要编译的 */ public void testHQL13(){ Session session = factory.openSession(); //这里通过getNameQuery这个方法来取得到配置文件中的hql语句 Query query = session.getNamedQuery( "getUserInfo" ); query.setString( "address" , "Beijing" ); query.setInteger( "age" , 22 ); List<User> users = query.list(); for (User user : users){ System.out.println(user.getName()); System.out.println( "---------------" ); } session.close(); }