1.MyBaits无代理全套增删改

一.mybatis使用的准备工作

1.找到mybatis所需要的jar文件:

mybatis-3.2.3.jar

mybatis-spring-1.2.1.jar

2.解压mybatis-3.2.3.jar文件找到如下两个dtd文件

mybatis-3-config.dtd

mybatis-3-mapper.dtd

3.记住mybatis配置的关键key

mybatis配置:
--映射文件
public id : -//mybatis.org//DTD Mapper 3.0//EN
system id : http://mybatis.org/dtd/mybatis-3-mapper.dtd

--主配置文件
public id : -//mybatis.org//DTD Config 3.0//EN
system  id :http://mybatis.org/dtd/mybatis-3-config.dtd

4.在myeclipse中配置mybatis的环境,即配置dtd文件,以便写代码时有提示

5.将mybatis的dtd文件配置到myeclipse中步骤如下：

二、mybatis无代理全套增删改查

2.1 创建一个javaweb项目MyBatis_Part1

2.2 在项目的src下创建Configuration.xml主配置文件

 <?xml version="1.0" encoding="UTF-8"?>
 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
 <configuration>
    <!-- 路径别名配置 -->
    <typeAliases>
      <typeAlias type="com.entity.Dept" alias="Dept"/>
    </typeAliases>
 
    <!-- 链接数据库的环境配置，development开发模式 -->
    <environments default="development">
       <environment id="development">
         <!-- jdbc管理事务 -->
         <transactionManager type="jdbc"/>
         <!-- 数据源配置 -->
         <dataSource type="POOLED">
            <property name="driver" value="oracle.jdbc.driver.OracleDriver"/>
            <property name="url" value="jdbc:oracle:thin:@127.0.0.1:1521:orcl"/>
            <property name="username" value="scott"/>
            <property name="password" value="tiger"/>
         </dataSource>
 
       </environment>
    </environments>
    <!-- 注册映射文件 -->
    <mappers>
      <mapper resource="com/mapper/DeptMapper.xml"/>
    </mappers>
 
 </configuration>

2.3 在src下的com.entity包下创建Dept.java文件

 package com.entity;
 
 public class Dept {
     private int deptno;
     private String dname;
     private String loc;
 
     public Dept() {
     }
 
     public Dept(int deptno, String dname, String loc) {
         this.deptno = deptno;
         this.dname = dname;
         this.loc = loc;
     }
 
     public int getDeptno() {
         return deptno;
     }
 
     public void setDeptno(int deptno) {
         this.deptno = deptno;
     }
 
     public String getDname() {
         return dname;
     }
 
     public void setDname(String dname) {
         this.dname = dname;
     }
 
     public String getLoc() {
         return loc;
     }
 
     public void setLoc(String loc) {
         this.loc = loc;
     }
 
     @Override
     public String toString() {
         return "Dept [deptno=" + deptno + ", dname=" + dname + ", loc=" + loc
                 + "]";
     }
 
 }

2.4 在src下的com.mapper包下创建DeptMapper.java文件

 package com.mapper;
 
 import java.util.List;
 
 import com.entity.Dept;
 
 /**
  * 映射接口
  * @author pc
  *
  */
 public interface DeptMapper {
     /**
      * 查询所有
      * @return
      */
     public List<Dept> getAll();
     /**
      * 根据id查询
      * @param id
      * @return
      */
     Dept findId(int deptno);
     /**
      * 修改对象
      * @param dept
      * @return
      */
     int updateDept(Dept dept);
     /**
      * 保存
      * @param dept
      * @return
      */
     int saveDept(Dept dept);
     /**
      * 删除
      * @param id
      * @return
      */
     int deleteById(int id);
 
 }

2.5 在src下的com.mapper包下创建DeptMapper.xml映射文件

 <?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" >
 <!-- namespace的值，
 如果用有代理的模式实现增删改，那么值必须是映射接口的全路径，
 如果用无代理模式实现增删改，那么值可以是任意的 ，但是一般情况是映射接口的全路径-->
 <mapper namespace="test">
   <!-- id的值必须要和映射接口的方法名保持一致， -->
   <!-- 查询所有 -->
   <select id="getAll" resultType="Dept">
     select * from dept
   </select>
 
   <!--2. 根据id查询 -->
   <!-- parameterType参数类型 -->
   <select id="findId" resultType="Dept" parameterType="int">
     select * from dept where deptno=#{deptno}
   </select>
 
   <!-- 3.修改 -->
   <update id="updateDept" parameterType="Dept">
     update dept set dname=#{dname},loc=#{loc} where deptno=#{deptno}
   </update>
 
   <!-- 4.保存 -->
   <insert id="saveDept" parameterType="Dept">
     insert into dept values(#{deptno},#{dname},#{loc})
   </insert> 
 
   <!-- 5.删除 -->
   <delete id="deleteById" parameterType="int">
     delete from dept where deptno=#{deptno}
   </delete>
 </mapper>

2.6 在src下的com.util包下创建MyBatisUtil.java

 package com.util;
 
 import java.io.InputStream;
 import java.io.Reader;
 
 import org.apache.ibatis.io.Resources;
 import org.apache.ibatis.session.SqlSession;
 import org.apache.ibatis.session.SqlSessionFactory;
 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
 
 /**
  * 获取sqlsession工具类
  * @author pc
  *
  */
 public class MyBatisUtil {
     //定义sqlsessionFactory对象
     private static SqlSessionFactory sqlSessionFactory=null;
 
     static{
         //读取xml文件
         InputStream is=MyBatisUtil.class
           .getClassLoader()
           .getResourceAsStream("Configuration.xml");
         //Reader rader=Resources.getResourceAsReader("Configuration.xml");
 
         //创建sqlsessionFactory对象
         sqlSessionFactory=new SqlSessionFactoryBuilder().build(is);
 
     }
     /**
      * 获取SqlSession对象的方法
      * @param commit 如果为true表示执行完操作自动提交事务，false反之
      * @return
      */
     public static SqlSession getSqlSession(boolean iscommit){
         return sqlSessionFactory.openSession(iscommit);
     }
 
 }

2.7 在src下的com.mapper.impl包下创建DeptMapperImpl.java

 package com.mapper.impl;
 
 import java.util.List;
 
 import org.apache.ibatis.session.SqlSession;
 
 import com.entity.Dept;
 import com.mapper.DeptMapper;
 import com.util.MyBatisUtil;
 
 public class DeptMapperImpl implements DeptMapper {
     /**
      * 1.查询所有
      */
     public List<Dept> getAll() {
         //1.获取sqlsession,执行完操作不自动提交事务
         SqlSession sqlSession=MyBatisUtil.getSqlSession(false);
 
         //2.调用方法执行操作,
         //Stirng类型的参数=映射文件的namespace的值.映射文件的id
         List<Dept> list=sqlSession.selectList("test.getAll");
         //3.关闭sqlsession
         sqlSession.close();
         return list;
     }
     /**
      * 2.查询单条
      */
     public Dept findId(int deptno) {
         //1.获取sqlsession,执行完操作不自动提交事务
         SqlSession sqlSession=MyBatisUtil.getSqlSession(false);
 
         Dept dept=sqlSession.selectOne("test.findId", deptno);
 
         sqlSession.close();
         return dept;
     }
 
     /**
      * 3.添加
      */
     public int saveDept(Dept dept) {
         //1.获取sqlsession,执行完操作不自动提交事务
         SqlSession sqlSession=MyBatisUtil.getSqlSession(true);
 
         int num=sqlSession.insert("test.saveDept", dept);
 
         sqlSession.close();
         return num;
     }
     /**
      * 4.删除
      */
     public int deleteById(int id) {
         //1.获取sqlsession,执行完操作不自动提交事务
         SqlSession sqlSession=MyBatisUtil.getSqlSession(true);
 
         int num=sqlSession.delete("test.deleteById", id);
         sqlSession.close();
         return num;
     }
 
  /**
   * 5.修改
   */
     public int updateDept(Dept dept) {
         //1.获取sqlsession,执行完操作不自动提交事务
         SqlSession sqlSession=MyBatisUtil.getSqlSession(true);
 
         int num=sqlSession.update("test.updateDept", dept);
         sqlSession.close();
         return num;
     }
 
 }

2.8 在src下的com.test包下创建Test.java

 package com.test;
 
 import java.util.List;
 
 import com.entity.Dept;
 import com.mapper.DeptMapper;
 import com.mapper.impl.DeptMapperImpl;
 
 public class Test {
 
     /**
      * @param args
      */
     public static void main(String[] args) {
         DeptMapper mapper=new DeptMapperImpl();
 
          System.out.println("-------------3.添加--------------");
            /* Dept savedept=new Dept(60, "学术部", "8号楼");
            int num= mapper.saveDept(savedept);
            if(num>0){
                System.out.println("insert success");
            }else{
 
                System.out.println("insert fail");
            }
            */
         System.out.println("----------1.查询所有--------------");
 
         List<Dept> list=mapper.getAll();
         for (Dept dept : list) {
             System.out.println(dept);
         }
         System.out.println("----------2.查询单条--------------");
          Dept dept= mapper.findId(10);
          System.out.println(dept);
 
          System.out.println("-----------4.修改--------");
         /* Dept updatedept=mapper.findId(60);
          updatedept.setDname("huolly11");
          updatedept.setLoc("222");
 
         int upnum= mapper.updateDept(updatedept);
         if(upnum>0){
             System.out.println("update success");
         }else{
             System.out.println("update fail");
 
         }*/
         System.out.println("------------6.删除---------------");
        /* Dept deldept=mapper.findId(50);
         int delnum=mapper.deleteById(deldept.getDeptno());
         if(delnum>0){
             System.out.println("delete success");
         }else{
             System.out.println("delete fail");
 
         }*/
     }
 
 }