Mybatis
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)
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<!DOCTYPE configurationPUBLIC "-//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
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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
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<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//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"><br> <!--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
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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
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<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//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
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/* * 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。
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/* * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ * 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
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/* * ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ * 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
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testresultMap()； |
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selectAllDeptUseAlias()； |
4.session.getMapper()方法
4.1
创建IDeptDao接口
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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
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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<br> //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()); } } } |
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4.3测试结果:<br>查询全部信息 |
