Mybatis(综合案例)

2023-08-01 09:52:16

MyBatis本是apache的一个开源项目iBatis,2010年这个项目有Apache software foundation 迁移到了Google code,并改名MyBatis.2013年11月迁移到Github。iBatis是半ORM映射框架，它需要在数据库里手动建表，CURD操作时要自己写SQL语句，而Hibernate是全ORM映射框架，它只需要配置好文件，表会自动生成，CURD的SQL语句也是自动生成的，这是他们的主要区别。

MyBatis小巧，简单易学

MyBatis入门案例(综合)

1.1附加架包

1.2编写MyBatis配置文件 mybatis-comfig.xml(由于本人oracle数据库安装的问题端口号及数据库有所不同)

<!DOCTYPE configuration

PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

<!--  别名的配置      Dept-->

	<typeAliases>

		<typeAlias type="cn.mybatis.entity.Dept" alias="Dept"/>

	</typeAliases>

	<environments default="development">

		<environment id="development">

			<transactionManager type="JDBC" />

			<dataSource type="POOLED">

			    <property name="driver" value="oracle.jdbc.OracleDriver" />

				<property name="url" value="jdbc:oracle:thin:@localhost:1522:orc" />

				<property name="username" value="bxq" />

				<property name="password" value="bxq" />

			</dataSource>

		</environment>

	</environments>

	<!--关联小配置-->

	<mappers>

		<mapper resource="cn/mybatis/entity/Dept.xml" />

		<mapper resource="cn/mybatis/entity/Dept2.xml" />

	</mappers>

</configuration>

1.3编写Dept实体类

package cn.mybatis.entity;

public class Dept {

	private Integer deptNo;//部门编号

	private String deptName;//部门名称

	private String deptCity;//部门所在地址

	public String getDeptCity() {

		return deptCity;

	}

	public void setDeptCity(String deptCity) {

		this.deptCity = deptCity;

	}

	public Integer getDeptNo() {

		return deptNo;

	}

	public void setDeptNo(Integer deptNo) {

		this.deptNo = deptNo;

	}

	public String getDeptName() {

		return deptName;

	}

	public void setDeptName(String deptName) {

		this.deptName = deptName;

	}

	@Override

	public String toString(){

		return "Dept [deptNo= " + deptNo +", deptName=" + deptName+",deptCity"+deptCity+"]";

	}

}

1.4编写Dept.xml小配置文件

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper

PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="cn.mybatis.entity.Dept">

<resultMap type="Dept" id="resultMapper">

	<result property="deptName" column="deptName"/>

	<result property="deptNo" column="deptNo"/>

	<result property="deptCity" column="deptCity"/>

</resultMap>

　　　　　<!--代替"*"的方法-->

	<sql id="columns">
　　　　　　　　　　<!--植入所需要的列名-->

		deptNo,deptName,deptCity

	</sql>

　　<!--++++++++++++++++++++++++++resultMap 实现结果映射++++++++++++++++++++-->

		<!-- 查询部门信息   resultMap 实现结果映射 -->

		<select id="selectAllDeptMapper" resultMap="resultMapper">

			select * from dept

		</select>

		<!-- 代替"*"  连接sql标签的id="columns"-->

		<select id="selectAllDeptUseAlias" resultType="Dept">

			select <include refid="columns"/> from dept

		</select>

	<!-- +++++++++++++++++++++++++++++++分割线+++++++++++++++++++++++++++ -->

	<!-- 1.1查询部门所有信息 -->

		<select id="selectAllDept" resultType="Dept">

		<!--查询所有部门信息  -->

		<!-- SQL不区分大小写 -->

			select * from dept

		</select>

	<!-- 增加部门信息 -->

		<insert id="insertDept" parameterType="Dept">

		 	insert into dept values(#{deptNo},#{deptName},#{deptCity})

		</insert>

	<!-- 删除信息 -->

		<delete id="deleteDept" parameterType="Dept">

			delete from dept where deptNo=#{deptNo}

		</delete>

	<!-- 修改信息 -->

		<update id="updateDept" parameterType="Dept">

			update dept set deptName=#{deptName} where deptNo=#{deptNo}

		</update>

	<!-- 模糊查询 -->

		<select id="likeDept" parameterType="Dept" resultType="Dept">

			select * from dept where deptName like '%${deptName}%'

		</select>

	</mapper>

1.5书写MyTest测试类

package cn.mybatis.Test;

import java.io.IOException;

import java.io.Reader;

import java.util.List;

import org.apache.ibatis.io.Resources;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.Before;

import org.junit.Test;

import cn.mybatis.entity.Dept;

public class MyTest {

	SqlSession session;

	@Before

	public void initData() throws IOException{

		   Reader  reader=Resources.getResourceAsReader("mybatis-config.xml");

		  SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);

		  session= factory.openSession();

	}

	 @Test

	   public void testselectAllDept() throws IOException{

		  //在xml配置中的一个锁定唯一SQL的id

		  List<Dept> selectList = session.selectList("selectAllDept");

		  for (Dept dept : selectList) {

			  System.out.println(dept);

		  }

	   }

	 //模糊查詢

	@Test

	public void likeTest(){

		Dept dept = new Dept();

		dept.setDeptName("市场");

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.likeDept",dept);

		for (Dept item : list) {

			System.out.println(item);

		}

		session.close();

	}

	//修改

	@Test

	public void updateTest(){

		Dept dept = new Dept();

		dept.setDeptNo(5);

		dept.setDeptName("开发部");

		int count = session.update("cn.mybatis.entity.Dept.updateDept",dept);

		session.commit();

		System.out.println(count+"update ok!!!");

		session.close();

	}

	//删除

	 @Test

	   public void testdeleteDept() throws IOException{

		 Dept dept = new Dept();

		  dept.setDeptNo(8);

		  int count = session.delete("cn.mybatis.entity.Dept.deleteDept",dept);

		  session.commit();

		  System.out.println(count+"del ok!");

	   }

	 //增加

	 @Test

	   public void testinsertDept() throws IOException{

		 Dept dept = new Dept();

		 dept.setDeptNo(8);

		 dept.setDeptName("财务部1");

		 dept.setDeptCity("上海");

		  int count = session.insert("cn.mybatis.entity.Dept.insertDept",dept);

		  session.commit();

		  System.out.println(count+"insert ok!!!");

	   }

	 /*

	  * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

	  *  resultMap的使用

	  */

	@Test

	public void testresultMap() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptMapper");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

	@Test

	public void selectAllDeptUseAlias() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptUseAlias");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

	/*

	 * 动态查询+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

	 */

	@Test

	 public void TestdynamicSelect() throws IOException{

		 Dept dept = new Dept();

		 dept.setDeptName("市场部");

		 dept.setDeptNo(4);

		 dept.setDeptCity("北京");

		 List<Dept> list = session.selectList("cn.mybatis.dao.IDeptDao.dynamicSelect",dept);

		 for (Dept dept2 : list) {

			System.out.println(dept2);

		}

	 }

	//动态修改

	@Test

	 public void Testdynamicupdate() throws IOException{

		 Dept dept = new Dept();

		 dept.setDeptName("市场部1");

		 dept.setDeptNo(4);

		 dept.setDeptCity("北京");

		int count = session.update("cn.mybatis.dao.IDeptDao.dynamicUpdate",dept);

			System.out.println(count);

			session.close();

		}

}

由于测试方法过多我们简单的运行出来一二个看一下结果

查询:

删除:

2. 动态查询

2.1编写Dept2.xml

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper

PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="cn.mybatis.dao.IDeptDao">

	<!-- 1.1查询部门所有信息 -->

		<select id="selectDeptByNo" parameterType="int" resultType="Dept">

		<!--查询所有部门信息  -->

		<!-- SQL不区分大小写 -->

			select * from dept where deptNo=#{deptNo}

		</select>

		<select id="getMapper" resultType="Dept">

			select * from dept

		</select>

		<!-- 动态查询 -->

		<select id="dynamicSelect" parameterType="Dept" resultType="Dept">

			select * from dept

			<where>

				<if test="deptNo!=null">

					and deptNo=#{deptNo}

				</if>

				<if test="deptName!=null">

					and deptName=#{deptName}

				</if>

				<if test="deptCity!=null">

					and deptCity=#{deptCity}

				</if>

			</where>

		</select>

		<!-- 动态修改 -->

		<select id="dynamicUpdate" parameterType="int" resultType="Dept">

			update dept

			<set>

				<if test="deptNo!=null">

					 deptNo=#{deptNo},

				</if>

				<if test="deptName!=null">

					 deptName=#{deptName},

				</if>

				<if test="deptCity!=null">

					 deptCity=#{deptCity},

				</if>

			</set>

				where deptNo=#{deptNo}

		</select>

	</mapper>

2.3在1.5 书写MyTest测试类中可找到我们需要的测试类

/*

	 * 动态查询+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

	 */

	@Test

	 public void TestdynamicSelect() throws IOException{

		 Dept dept = new Dept();

		 dept.setDeptName("市场部");

		 dept.setDeptNo(4);

		 dept.setDeptCity("北京");

		 List<Dept> list = session.selectList("cn.mybatis.dao.IDeptDao.dynamicSelect",dept);

		 for (Dept dept2 : list) {

			System.out.println(dept2);

		}

	 }

	//动态修改

	@Test

	 public void Testdynamicupdate() throws IOException{

		 Dept dept = new Dept();

		 dept.setDeptName("市场部1");

		 dept.setDeptNo(4);

		 dept.setDeptCity("北京");

		int count = session.update("cn.mybatis.dao.IDeptDao.dynamicUpdate",dept);

			System.out.println(count);

			session.close();

		}

2.4运行结果

动态查询

动态修改

3.resultMap实现结果映射

3.1 先前在 1.4编写Dept.xml小配置文件中已经配置好了需要用到的条件。

 /*

	  * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

	  *  resultMap的使用

	  */

	@Test

	public void testresultMap() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptMapper");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

	@Test

	public void selectAllDeptUseAlias() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptUseAlias");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

3.2测试类与1.5书写MyTest测试类中可见　　

 /*

	  * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

	  *  resultMap的使用

	  */

	@Test

	public void testresultMap() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptMapper");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

	@Test

	public void selectAllDeptUseAlias() throws IOException{

		List<Dept> list = session.selectList("cn.mybatis.entity.Dept.selectAllDeptUseAlias");

		for (Dept dept : list) {

			System.out.println(dept);

		}

		session.close();

	}

3.3测试结果

testresultMap()；

selectAllDeptUseAlias()；

4.session.getMapper()方法

4.1

创建IDeptDao接口

package cn.mybatis.dao;

import java.util.List;

import cn.mybatis.entity.Dept;

/**

 * 接口

 * @author xiaobai

 *

 */

public interface IDeptDao {

	public Dept selectDeptByNo(Integer deptNo);

	public List<Dept> getMapper();

}

　4.2编写MyTest2测试类

package cn.mybatis.Test;

import java.io.IOException;

import java.io.Reader;

import java.util.List;

import org.apache.ibatis.io.Resources;

import org.apache.ibatis.session.SqlSession;

import org.apache.ibatis.session.SqlSessionFactory;

import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import org.junit.Before;

import org.junit.Test;

import cn.mybatis.dao.IDeptDao;

import cn.mybatis.entity.Dept;

public class MyTest2 {

	SqlSession session;

	@Before

	public void initData() throws IOException{

		   Reader  reader=Resources.getResourceAsReader("mybatis-config.xml");

		  SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);

		  session= factory.openSession();

	}

	//实现getMapper接口
　　　　 //按条件查询

	@Test

	public void TestgetMapper(){

		IDeptDao mapper = session.getMapper(IDeptDao.class);

		Dept dept = mapper.selectDeptByNo(5);

		System.out.println(dept.getDeptName());

		session.close();

	}

	//查询全部信息

	@Test

	public void TestgetMapper1() throws Exception{

		IDeptDao mapper = session.getMapper(IDeptDao.class);

		List<Dept> list=mapper.getMapper();

		for (Dept dept : list) {

			System.out.println(dept.getDeptName());

		}

	}

}

4.3测试结果:
查询全部信息

码农公寓

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