hibernate中的QBC查询

1、实体类Student.java

package model;

public class Student {
	private Integer stu_Id;
	private String stu_Name;
	private String stu_Address;
	public Integer getStu_Id() {
		return stu_Id;
	}
	public void setStu_Id(Integer stu_Id) {
		this.stu_Id = stu_Id;
	}
	public String getStu_Name() {
		return stu_Name;
	}
	public void setStu_Name(String stu_Name) {
		this.stu_Name = stu_Name;
	}
	public String getStu_Address() {
		return stu_Address;
	}
	public void setStu_Address(String stu_Address) {
		this.stu_Address = stu_Address;
	}
	@Override
	public String toString() {
		return "Stduent [stu_Id=" + stu_Id + ", stu_Name=" + stu_Name + ", stu_Address=" + stu_Address + "]";
	}
	
}

2、实体类配置文件Student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC 
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<!-- javabean与表之间的对应关系 -->
	<class name="model.Student" table="student">
		<!-- 主键对应 -->
		<id name="stu_Id" column="stuID">
			<!-- 主键策略（与自增长相关） -->
			<!-- hibernate框架来产生主键 整形 -->
			<!-- increment 在多线程情况下不能用这种方式 -->
			<!-- identity 主键由数据库产生，适用于mysql -->
			<!-- oracle 主键由数据库产生，适用于oracle -->
			<!-- uuid 产生32位随机数，String类型，可以在多线程情况下使用-->
			<!-- assigned：唯一的自然主键生成方式，需要手动去设置主键-->
			<generator class="native"></generator>
		</id>
		<!-- 其他字段 -->
		<property name="stu_Name" column="stuName"></property>
		<property name="stu_Address" column="stuAddress"></property>
	</class>
</hibernate-mapping>

3、创建工具类HibernateUtils.java

package util;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtils {
	//使用一个静态块创建SessionFactory
	private static Configuration CONFIG;
	private static SessionFactory FACTORY;
	
	static {
		CONFIG = new Configuration().configure();
		FACTORY = CONFIG.buildSessionFactory();
	}
	
	//从连接池中获取连接
	public static Session openSession() {
		return FACTORY.openSession();
	}
	
	//session绑定到线程
	public static Session getCurrentSession() {
		return FACTORY.getCurrentSession();
	}
}

4、配置hibernate.cfg.xml

<?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>
	<!-- 配置连接信息 -->
	<session-factory>
		<!-- 必选配置 -->
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">1234</property>
		<!-- 数据库方言 使用的数据库类型 -->
		<property name="hibernate.dialect org.hibernate.dialect.MySQLDialect"></property>
		<!-- 可选配置 -->
			<!-- 显示sql -->
		<property name="hibernate.show_sql">true</property>
			<!-- 格式化sql -->
		<property name="hibernate.format_sql">true</property>
			<!-- 配置c3p0连接池 -->
		<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
			<!-- 最小连接数 -->
		<property name="hibernate.c3p0.min_size">5</property>
			<!-- 最大连接数 -->
		<property name="hibernate.c3p0.max_size">20</property>
			<!-- 最大空闲连接120秒 -->
		<property name="hibernate.c3p0.timeout">120</property>
			<!-- 自动建表 删除，创建，删除：creat-drop  创建：creat 如果没有表就创建，有就同步：update（一般使用） 验证类和数据表结构是否一致：validate-->
		<property name="hibernate.hbm2ddl.auto">update</property>
			<!-- 把session绑定到当前线程,使用getCurrentSession获取当前session -->
		<property name="hibernate.current_session_context_class">thread</property>
		<!-- 映射文件 -->
		<mapping resource="model/Student.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

5、编写测试类 TestQBC.java

package test;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.criterion.Restrictions;
import org.hibernate.loader.criteria.CriteriaQueryTranslator;
import org.junit.Test;

import model.Student;
import util.HibernateUtils;

public class TestQBC {
	/**
	 * 不带条件的查询
	 */
	@Test
	public void test01() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
	}
	
	/**
	 * 模糊查询like
	 */
	@Test
	public void test02() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		//2.设置条件
		c.add(Restrictions.like("stu_Name", "%熊%"));
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
		tr.commit();
	}
	
	/**
	 * and 多条件查询
	 */
	@Test
	public void test03() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		//2.设置条件
		c.add(Restrictions.like("stu_Name", "%熊%"));
		//设置第二个条件
		c.add(Restrictions.like("stu_Address","北京"));
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
		tr.commit();
	}
	
	/**
	 * or 多条件查询
	 */
	@Test
	public void test04() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		//2.设置条件 名字带熊或地址为北京的
		c.add(Restrictions.or(Restrictions.like("stu_Name","%熊%"),Restrictions.like("stu_Address", "北京")));
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
		tr.commit();
	}
	/**
	 * between...and 多条件查询
	 */
	@Test
	public void test05() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		//2.设置条件 id在10005到10015之间
		c.add(Restrictions.between("stu_Id", 0, 10015));
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
		tr.commit();
	}
	/**
	 * 分页
	 */
	@Test
	public void test06() {
		//1.创建对象
		Session session = HibernateUtils.openSession();
		Transaction tr = session.beginTransaction();
		Criteria c = session.createCriteria(Student.class);
		//参考mysql的分页 limit index size
		//index 从哪一条记录开始 索引
		//size 每页数据大小
		c.setFirstResult(2);//第三条记录
		c.setMaxResults(2);//每页数据
		List<Student> students = c.list();
		for(Student student : students) {
			System.out.println(student);
		}
		tr.commit();
	}
}

hibernate中的QBC查询

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