hibernate的参数查询

 大配置文件：hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <!-- 指定数据库所用到的驱动 -->
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <!-- 指定数据库链接的url，hibernate链接的数据库名 -->
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
        <!-- 指定连接数据库的用户名 -->
        <property name="connection.username">root</property>
        <!-- 指定连接数据库的用户口令 -->
        <property name="connection.password">root</property>
        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!--格式化sql -->
        <property name="format_sql ">true</property>
        <!-- 打印sql 控制台-->
        <property name="show_sql">true</property>
        <!-- 指定数据库方言 -->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
        <!-- 根据需要自动创建数据库表 -->
        <property name="hbm2ddl.auto">update</property>

        <!--关联小配置文件-->
        <mapping resource="cn/day01/entity/School.hbm.xml"></mapping>
        <mapping resource="cn/day03hql/hql/entity/Dept.hbm.xml"></mapping>
    </session-factory>
</hibernate-configuration>

实体类

public class Dept {
    private int deptid;
    private String deptname;

    public Dept() {
    }

    public Dept(int deptid, String deptname) {
        this.deptid = deptid;
        this.deptname = deptname;
    }

    public int getDeptid() {
        return deptid;
    }
    public void setDeptid(int deptid) {
        this.deptid = deptid;
    }

    public String getDeptname() {
        return deptname;
    }
    public void setDeptname(String deptname) {
        this.deptname = deptname;
    }
}


小配置文件

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- 映射文件开始 -->
<hibernate-mapping package="cn.day03hql.hql.entity">
    <!--表名称-->
    <class name="cn.day03hql.hql.entity.Dept" table="DEPT" schema="root">
        <!--列名-->
       <id name="deptid" column="DEPTID">
           <!--主键生成的策略  native：自动生成主键字段-->
           <generator class="native"></generator>
       </id>
        <property name="deptname" column="DEPTNAME"></property>
    </class>
</hibernate-mapping>

测试类

添加条件可以使用名称占位符 （:name），也可以使用匿名占位符 （?）

 01.匿名占位符

    from Dept where name = ?  

给占位符设置值 query.setParameter(0,值);  注意，参数从0开始

 

//参数查询   方法一  匿名占位符  ？占位符的索引下标从0开始
@Test
public void test05(){
    //读取大配置文件
    Configuration cfg=new Configuration().configure();
    //session工厂
    SessionFactory factory=cfg.buildSessionFactory();
    //session对象
    Session session = factory.openSession();
    String hql=" from Dept where deptname=?";
    Query query = session.createQuery(hql);
    query.setParameter(0,"开发部");
    List<Dept> list = query.list();
    for (Dept dept:list){
        System.out.println(dept.getDeptname());
    }
}

 

 

 

02.,名称占位符

 

       from Customer where ntitle= :title

 

       给命名参数设置值 query.setParameter("title",值);

//参数查询   名称占位符 方法二  参数名称绑定 :name
@Test
public void test06(){
    //读取大配置文件
    Configuration cfg=new Configuration().configure();
    //session工厂
    SessionFactory factory=cfg.buildSessionFactory();
    //session对象
    Session session = factory.openSession();
    String hql=" from Dept where deptname=:deptname";
    Query query = session.createQuery(hql);
    query.setParameter("deptname","开发部");
    List<Dept> list = query.list();
    for (Dept dept:list){
        System.out.println(dept.getDeptname());
    }
}

  

 03.绑定命名参数与一个对象的属性值

//参数查询  对象类型 方法三  参数名称绑定+++对象属性 :name
@Test
public void test07(){
    //读取大配置文件
    Configuration cfg=new Configuration().configure();
    //session工厂
    SessionFactory factory=cfg.buildSessionFactory();
    //session对象
    Session session = factory.openSession();
    String hql=" from Dept where deptname=:deptname";
    Dept depts=new Dept();
    depts.setDeptname("开发部");

    Query query = session.createQuery(hql);
    query.setProperties(depts);
    List<Dept> list = query.list();
    for (Dept dept:list){
        System.out.println(dept.getDeptname());
    }
}


多个参数查询类似，所以这里就不说了。