Hibernate之hql

Street实体类

public class Street {

    public Street() {
    }

    public Street(String name) {
        this.name = name;
    }

    private Integer id;
    private String name;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDistrict_id() {
        return district_id;
    }

    public void setDistrict_id(String district_id) {
        this.district_id = district_id;
    }

    private String district_id;
}

　Street.hbm.xml小配置

<?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">
<hibernate-mapping package="cn.hibernate.day01.entity">
    <!--实体 name=实体端的内容   column=DB端的内容-->
    <class name="Street" table="STREET" dynamic-update="true">
        <!--和底层数据表对应的主键   业务意义-->
        <id name="id" column="ID">
            <!--主键生成策略 ：assigned:程序员手动给值-->
            <generator class="native"/>
        </id>
        <property name="name" column="NAME"></property>
        <property name="district_id" column="DISTRICT_ID"></property>
    </class>

</hibernate-mapping>

　　hibernate.cfg.xml大配置

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
   <!--创建Session的基础配置-->
    <session-factory>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>
        <property name="connection.username">zyx</property>
        <property name="connection.password">zyx</property>
        <!-- SQL dialect （方言）-->
        <property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
        <!-- Echo   all executed SQL to stdout 在控制台打印sql -->
        <property name="show_sql">true</property>
        <!--格式化SQL-->
        <property name="format_sql">true</property>
        <!-- Drop and re-create （重新创建）the database schema（架构） on startup （启动）
         是否根据hbm.xml自动建表 建表的策略 update create
        -->
        <property name="hbm2ddl.auto">update</property>
         <!--关联小配置 -->
        <mapping resource="cn/hibernate/day01/entity/Street.hbm.xml"/>

    </session-factory>

</hibernate-configuration>

　　

1,获取部分列查询

public void t5(){
        Configuration cfg=new Configuration().configure();
        //1.Session
        SessionFactory factory=cfg.buildSessionFactory();
        //2.session
        Session session=factory.openSession();  //从连接池中随机取出链接
        //3.操作
        Transaction tx=session.beginTransaction();
        String hql="select new Street(d.name)from Street d";
        Query query=session.createQuery(hql);
        List<Street> list=query.list();
        for (Street street:list) {
            System.out.println(street.getName());
        }

        tx.commit();
        session.close();

}

　2,参数查询，匿名占位符

public void t6(){
        Configuration cfg=new Configuration().configure();
        //1.Session
        SessionFactory factory=cfg.buildSessionFactory();
        //2.session
        Session session=factory.openSession();  //从连接池中随机取出链接
        //3.操作
        Transaction tx=session.beginTransaction();
        String hql="from Street d where d.name=?";
        Query query=session.createQuery(hql);
        query.setParameter(0,"李四1");
        List<Street> list=query.list();
        for (Street street:list
        ) {
        System.out.println(street.getName());
        }

        tx.commit();
        session.close();

        }

　3，参数查询，参数名绑定

  public void t7(){
        Configuration cfg=new Configuration().configure();
        //1.Session
        SessionFactory factory=cfg.buildSessionFactory();
        //2.session
        Session session=factory.openSession();  //从连接池中随机取出链接
        //3.操作
        Transaction tx=session.beginTransaction();
        String hql="from Street d where d.name=:name";
        Query query=session.createQuery(hql);
        query.setParameter("name","李四1");
        List<Street> list=query.list();
        for (Street street:list
                ) {
            System.out.println(street.getName());
        }

        tx.commit();
        session.close();

    }

　　

4，参数查询，参数名绑定加对象属性

public void t8(){
        Configuration cfg=new Configuration().configure();
        //1.Session
        SessionFactory factory=cfg.buildSessionFactory();
        //2.session
        Session session=factory.openSession();  //从连接池中随机取出链接
        //3.操作
        Transaction tx=session.beginTransaction();
        String hql="from Street d where d.name=:name";
        Query query=session.createQuery(hql);
        Street street=new Street();
        street.setName("李四1");
        query.setProperties(street);
        List<Street> list=query.list();
        for (Street item:list
                ) {
            System.out.println(item.getName());
        }

        tx.commit();
        session.close();

    }

　　5，动态sql

 public void t9(){
        Configuration cfg=new Configuration().configure();
        //1.Session
        SessionFactory factory=cfg.buildSessionFactory();
        //2.session
        Session session=factory.openSession();  //从连接池中随机取出链接
        //3.操作
        Transaction tx=session.beginTransaction();

        Street street=new Street();
        street.setName("李四1");
        street.setId(1);

       StringBuilder sb=new StringBuilder("from Street e where 1=1 ");

       if(street.getName()!=null){
         sb.append("and e.name=:name ");
       }
        if(street.getId()!=null){
          sb.append("and e.id>:id");
        }

        Query query=session.createQuery(sb.toString());

        query.setProperties(street);
        List<Street> list=query.list();
        for (Street item:list
                ) {
            System.out.println(item.getName());
        }

        tx.commit();
        session.close();

    }