MyBatis初学者配置

小配置

 <?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.entity.Dept">
 <!-- id:唯一标识：通过此id，程序可唯一锁定一条SQL
      parameterType：参数类型
      resultType：结果类型
 -->
     <sql id="columns">
     deptid,deptname
     </sql>
     <!-- 查询部分列*号用别名 -->
     <select id="selectSql" resultType="cn.entity.Dept">
         select <include refid="columns"></include> from Dept
     </select>

     <resultMap id="Dept" type="cn.entity.Dept">
     <result property="deptid" column="deptid"></result>
     </resultMap>
     <!-- 查询所有部门信息 -->
     <select id="selectDept" resultMap="Dept">
         select * from Dept
     </select>
     <!-- 带条件查询 -->
     <select id="selectDeptById" parameterType="cn.entity.Dept" resultType="cn.entity.Dept">
        select * from Dept where deptid=#{deptid}
     </select>
     <!-- 添加部门信息 -->
     <insert id="insertDept" parameterType="cn.entity.Dept">
         insert into Dept(deptname) values(#{deptname})
     </insert> 

     <!-- 删除部门信息 -->
     <delete id="deleteDept" parameterType="cn.entity.Dept">
          delete from Dept where deptid=#{deptid}
     </delete>
     <!-- 修改部门信息 -->
     <update id="updateDept" parameterType="cn.entity.Dept">
          update Dept set deptname=#{deptname} where deptid=#{deptid}
     </update>
     <!-- 模糊查询 -->
     <select id="likeDept" resultType="cn.entity.Dept" parameterType="cn.entity.Dept">
         select * from Dept where deptname like '%${deptname}%'
     </select>
     <!-- 智能标签where 动态查询 -->
      <select id="selectDeptDynamic" parameterType="cn.entity.Dept" resultType="cn.entity.Dept">
         select * from Dept
         <where>
           <if test="deptid!=null">
             and deptid=#{deptid}
           </if>
           <if test="deptname!=null">
             and deptname=#{deptname}
           </if>
         </where>
         </select>
         <!-- 智能标签set更新 -->
         <update id="updatesetDept" parameterType="cn.entity.Dept"  >
         update Dept
         <set>
         <if test="deptid!=null">deptid=#{deptid},</if>
         <if test="deptname!=null">deptname=#{deptname},</if>
         </set>
         where deptid=#{deptid}
         </update>

 </mapper>

大配置

 <?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>
     <environments default="development">
         <environment id="development">
         <!-- 事务策略是JDBC -->
             <transactionManager type="JDBC" />
             <!-- 数据源的方式 -->
             <dataSource type="POOLED">
                 <property name="driver" value="com.mysql.jdbc.Driver" />
                 <property name="url" value="jdbc:mysql://120.25.78.77:3306/zc" />
                 <property name="username" value="zc" />
                 <property name="password" value="zc" />
             </dataSource>
         </environment>
     </environments>
     <!--映射文件：描述某个实体和数据库表的对应关系 -->
     <mappers>
         <mapper resource="cn/entity/Dept.xml" />
     </mappers>
 </configuration>

测试类

 package cn.test;

 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.Reader;
 import java.util.List;

 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.entity.Dept;

 public class MybatisTest {

     SqlSession session;
     @Before
     public void initData() throws FileNotFoundException{
               //1.1 SqlSessionFactoryBuilder
                 SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();

                 //1.2 SqlSesssionFactory
                 Reader reader=new FileReader("src/mybatis-config.xml");
                 SqlSessionFactory factory = builder.build(reader);

                 //1.3  SqlSession
                 session= factory.openSession();
     }
     /**
      * 查询所有部门所有信息
      * @throws IOException
      */
     @Test
     public void selectDeptTest() throws IOException
     {
         List<Dept> list = session.selectList("selectDept");
         for (Dept dept : list) {
             System.out.println(dept.getDeptname());
         }
         session.close();
     }
     /**
      * 增加
      */
     @Test
     public void insertDeptTest()
     {
         Dept dt=new Dept();
         dt.setDeptname("大牛部");
         int count =session.insert("insertDept",dt);
         System.out.println(count);
         session.close();

     }
     /**
      * 带条件查询
      */
     @Test
     public void selectDeptByIdTest()
     {
         Dept dt= new Dept();
         dt.setDeptid(1);
         Dept dept=session.selectOne("selectDeptById",dt);
         System.out.println(dept.getDeptname());
         session.close();

     }
     /**
      * 删除
      */
     @Test
     public void deleteDeptTest()
     {
         Dept dt=new Dept();
         dt.setDeptid(3);
         int count = session.delete("deleteDept",dt);
         session.commit();
         System.out.println(count);
         session.close();
     }
     /**
      * 修改
      */
     @Test
     public void updateDeptTest()
     {
         Dept dt=new Dept();
         dt.setDeptid(1);
         dt.setDeptname("公关部");
         int count = session.update("updateDept",dt);
         session.commit();
         System.out.println(count);
         session.close();
     }
     /**
      * 模糊查询
      *
      */
     @Test
     public void likeDeptTest()
     {
         Dept dt=new Dept();
         dt.setDeptname("公");
         List<Dept> list = session.selectList("likeDept",dt);
         for (Dept dept : list) {
             System.out.println(dept.getDeptname());
         }
         session.close();

     }
     /**
      * 别名查询
      */
     @Test
     public void selectSqlTest()

     {
         List<Dept> list = session.selectList("selectSql");
         for (Dept dept : list) {
             System.out.println(dept.getDeptname());
         }
         session.close();

     }
     /**
      *    智能标签where进行动态查询
      */

     @Test
     public  void dynamicWhereTest() throws Exception{
         Dept dept=new Dept();
         //代表前台用户同时使用     部门编号     和   部门名称   发起了  检索
         dept.setDeptname("公关部");
         dept.setDeptid(1);

         List<Dept> list=session.selectList("selectDeptDynamic",dept);
         for (Dept dt : list) {
             System.out.println(dt.getDeptname());
         }
         session.close();
     }
     /**
      * 智能标签set更新
      *
      */
     @Test
     public void updatesetDeptTest()
     {
         Dept dt=new Dept();
         dt.setDeptid(1);
         dt.setDeptname("公布部");
         int count = session.update("updatesetDept",dt);
         session.commit();
         System.out.println(count);
         session.close();
     }

 }