一、项目结构

二、代码实现

 import java.util.List;

 import java.util.Map;

 import com.jmu.bean.Student;

 public interface IStudentDao {

     void insertStudent(Student student);

     void insertStudentCacheId(Student student);// 插入后获取

     void deleteStudentById(int id);

     void updateStudent(Student student);

     List<Student> selectAllStudents();// 查询所有

     /* Map<String,Object> selectAllStudentsMap(); */

     Student selectStudentById(int id); // 根据id查询

     List<Student> selectStudentsByName(String name);// 模糊查询

 }

com.jmu.dao.IStudentDao

 import java.util.List;

 import org.apache.ibatis.session.SqlSession;

 import org.apache.log4j.BasicConfigurator;

 import org.junit.After;

 import org.junit.Before;

 import org.junit.Test;

 import com.jmu.bean.Student;

 import com.jmu.dao.IStudentDao;

 import com.jmu.utils.MybatisUtils;

 public class MyTest {

     private IStudentDao dao;

     private SqlSession sqlSession;

     @Before

     public void Before() {

         sqlSession = MybatisUtils.getSqlSession();

         dao = sqlSession.getMapper(IStudentDao.class);

         BasicConfigurator.configure();

     }

   @After

   public void after(){

       if (sqlSession!=null) {

           sqlSession.commit();

     }

   }

     @Test

     public void test01() {

         Student student = new Student("明明", 19, 87.9);

         System.out.println("插入前：student=" + student);

         dao.insertStudent(student);

         System.out.println("插入后：student=" + student);

         sqlSession.commit();

     }

     // 插入后获取

     @Test

     public void test02() {

         Student student = new Student("明明", 23, 99.5);

         System.out.println("插入前：student=" + student);

         dao.insertStudentCacheId(student);

         System.out.println("插入后：student=" + student);

         sqlSession.commit();

     }

     @Test

     public void test03() {

         dao.deleteStudentById(25);

         sqlSession.commit();

     }

     @Test

     public void test04() {

         Student student = new Student("红酒", 23, 93.5);

         student.setId(28);

         dao.updateStudent(student);

         sqlSession.commit();

     }

     @Test

     public void test05() {

         List<Student> students = dao.selectAllStudents();

         for (Student student : students) {

             System.out.println(student);

         }

     }

     /*@Test

     public void test06() {

         Map<String, Object> map = dao.selectAllStudentsMap();

         System.out.println(map.get("王维"));

     }*/

     @Test

     public void test07() {

         Student student = dao.selectStudentById(154);

         System.out.println(student);

     }

     @Test

     public void test08() {

         List<Student> students = dao.selectStudentsByName("明");

         for (Student student : students) {

             System.out.println(student);

         }

     }

 }

com.jmu.test.MyTest

 ### Global logging configuration

 log4j.logger.test=debug,console

 ##log4j.Logger.com.jmu.dao.IStudentDao=trace,console

 ### Uncomment for MyBatis logging

 log4j.logger.org.apache.ibatis=ERROR

 log4j.logger.org.apache.ibatis.session.AutoMappingUnknownColumnBehavior=WARN

 ### Console output...

 log4j.appender.stdout=org.apache.log4j.ConsoleAppender

 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

 log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

 log4j.appender.lastEventSavedAppender=org.apache.ibatis.session.AutoMappingUnknownColumnBehaviorTest$LastEventSavedAppender

log4j.properties

 <?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="com.jmu.dao.IStudentDao">

     <insert id="insertStudent" parameterType="Student">

         insert into

         student(name,age,score) values(#{name},#{age},#{score})

     </insert>

     <insert id="insertStudentCacheId">

         insert into student(name,age,score) values(#{name},#{age},#{score})

         <selectKey resultType="int" keyProperty="id" order="AFTER">

             select

             @@identity

         </selectKey>

     </insert>

     <delete id="deleteStudentById">

         delete from student where id=#{XXX}<!--这里的#{} 仅仅是个占位符，里边放什么都行 -->

     </delete>

     <update id="updateStudent">

         update student set

         name=#{name},age=#{age},score=#{score} where id=#{id}

     </update>

     <select id="selectAllStudents" resultType="Student">

         select

         id,name,age,score from student

     </select>

     <select id="selectStudentById" resultType="Student">

         select

         id,name,age,score from student where id=#{JJJ}

     </select>

     <select id="selectStudentsByName" resultType="Student">

         <!-- select id,name,age,score from student where name like CONCAT('%',#{XXX},'%') -->

         <!-- select id,name,age,score from student where name like '%王二%' -->

         <!-- select id,name,age,score from student where name like '%${value}%'  --><!-- 不存在sql注入 风险，但是效率低 -->

         select id,name,age,score from student where name like '%' #{XXX} '%'<!--常用 -->

     </select>

 </mapper>

/mybatis4-mapperDynamicProxy/src/com/jmu/dao/mapper.xml

输出：

插入前：student=Student [id=null, name=明明, score=87.9, age=19]

0 [main] DEBUG com.jmu.dao.IStudentDao.insertStudent  - ==>  Preparing: insert into student(name,age,score) values(?,?,?)

56 [main] DEBUG com.jmu.dao.IStudentDao.insertStudent  - ==> Parameters: 明明(String), 19(Integer), 87.9(Double)

57 [main] DEBUG com.jmu.dao.IStudentDao.insertStudent  - <==    Updates: 1

插入后：student=Student [id=null, name=明明, score=87.9, age=19]

插入前：student=Student [id=null, name=明明, score=99.5, age=23]

82 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - ==>  Preparing: insert into student(name,age,score) values(?,?,?)

82 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - ==>  Preparing: insert into student(name,age,score) values(?,?,?)

83 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - ==> Parameters: 明明(String), 23(Integer), 99.5(Double)

83 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - ==> Parameters: 明明(String), 23(Integer), 99.5(Double)

85 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - <==    Updates: 1

85 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId  - <==    Updates: 1

88 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - ==>  Preparing: select @@identity

88 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - ==>  Preparing: select @@identity

88 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - ==> Parameters:

88 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - ==> Parameters:

126 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - <==      Total: 1

126 [main] DEBUG com.jmu.dao.IStudentDao.insertStudentCacheId!selectKey  - <==      Total: 1

插入后：student=Student [id=165, name=明明, score=99.5, age=23]

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==>  Preparing: delete from student where id=?

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==>  Preparing: delete from student where id=?

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==>  Preparing: delete from student where id=?

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==> Parameters: 25(Integer)

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==> Parameters: 25(Integer)

145 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - ==> Parameters: 25(Integer)

146 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - <==    Updates: 0

146 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - <==    Updates: 0

146 [main] DEBUG com.jmu.dao.IStudentDao.deleteStudentById  - <==    Updates: 0

162 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==>  Preparing: update student set name=?,age=?,score=? where id=?

162 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==>  Preparing: update student set name=?,age=?,score=? where id=?

162 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==>  Preparing: update student set name=?,age=?,score=? where id=?

162 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==>  Preparing: update student set name=?,age=?,score=? where id=?

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==> Parameters: 红酒(String), 23(Integer), 93.5(Double), 28(Integer)

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==> Parameters: 红酒(String), 23(Integer), 93.5(Double), 28(Integer)

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==> Parameters: 红酒(String), 23(Integer), 93.5(Double), 28(Integer)

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - ==> Parameters: 红酒(String), 23(Integer), 93.5(Double), 28(Integer)

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - <==    Updates: 0

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - <==    Updates: 0

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - <==    Updates: 0

163 [main] DEBUG com.jmu.dao.IStudentDao.updateStudent  - <==    Updates: 0

181 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==>  Preparing: select id,name,age,score from student

181 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==>  Preparing: select id,name,age,score from student

181 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==>  Preparing: select id,name,age,score from student

181 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==>  Preparing: select id,name,age,score from student

181 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==>  Preparing: select id,name,age,score from student

182 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==> Parameters:

182 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==> Parameters:

182 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==> Parameters:

182 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==> Parameters:

182 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - ==> Parameters:

188 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - <==      Total: 8

188 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - <==      Total: 8

188 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - <==      Total: 8

188 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - <==      Total: 8

188 [main] DEBUG com.jmu.dao.IStudentDao.selectAllStudents  - <==      Total: 8

Student [id=157, name=明明, score=87.9, age=19]

Student [id=158, name=明明, score=87.9, age=19]

Student [id=159, name=明明, score=87.9, age=19]

Student [id=160, name=明明, score=87.9, age=19]

Student [id=162, name=明明, score=87.9, age=19]

Student [id=163, name=明明, score=99.5, age=23]

Student [id=164, name=明明, score=87.9, age=19]

Student [id=165, name=明明, score=99.5, age=23]

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

206 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==>  Preparing: select id,name,age,score from student where id=?

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

207 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - ==> Parameters: 157(Integer)

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

211 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentById  - <==      Total: 1

Student [id=157, name=明明, score=87.9, age=19]

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

247 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==>  Preparing: select id,name,age,score from student where name like '%' ? '%'

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

253 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - ==> Parameters: 明(String)

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

262 [main] DEBUG com.jmu.dao.IStudentDao.selectStudentsByName  - <==      Total: 8

Student [id=157, name=明明, score=87.9, age=19]

Student [id=158, name=明明, score=87.9, age=19]

Student [id=159, name=明明, score=87.9, age=19]

Student [id=160, name=明明, score=87.9, age=19]

Student [id=162, name=明明, score=87.9, age=19]

Student [id=163, name=明明, score=99.5, age=23]

Student [id=164, name=明明, score=87.9, age=19]

Student [id=165, name=明明, score=99.5, age=23]

output

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