Mybatis(综合案例)

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