MyBatis复习【简单配置CRUD】

这里的案例集成了log4j的日志框架，项目架构：

用到的jar文件

添加配置文件：mybatis-config.xml  和dao层配置文件StudentDao.xml

这里书写了个简单的案例仅为了说明问题

dao中有几个增删改查的抽象方法

 /**
      * 添加新的学生
      * @param stu
      * @return 返回 该insert语句成功后的自增列
      * @throws IOException
      */
     public int SaveInfo(Student stu) throws IOException;

     /**
      * 根据id删除学生信息
      * @param stuno
      * @return
      * @throws IOException
      */
     public int DeleteInfo(int stuno) throws IOException;

     /**
      * 根据学生对象 模糊查询学生信息
      */
     public List<Student> getAllInfoByStudent(Student stu) throws IOException;

     /**
      * 根据学生姓名 模糊查询学生信息
      */
     public List<Student> getAllInfoByName(String stuName) throws IOException;
     

书写doa对应的配置文件

 <?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.zym.mybatis.dao">
     <!-- <select id="addStudent" parameterType="cn.zym.mybatis.entity.Student">
         insert into Student(stuname,stuage) values(#{stuName},#{stuAge})
     </select> -->
     <insert id="addStudent" parameterType="Student">
         insert into Student(stuname,stuage) values(#{stuName},#{stuAge})
         <selectKey keyProperty="stuNo" resultType="_integer" order="AFTER">
         <!-- oracle需要设置order为BEFORE   :select seq_ssm.currval from dual(); -->
             select @@identity
         </selectKey>
     </insert>

     <delete id="deleteInfo" parameterType="int">
         delete from student where stuno=#{stuno}
     </delete>

     <select id="getAllInfoByStudent" parameterType="Student" resultType="Student">
         select * from student s where s.stuname like concat('%',#{stuName},'%')
     </select>

     <select id="getAllInfoByName" resultType="Student">
         select * from student s where s.stuname like '%${value}%'<!-- 此处若要使用${xxx}的写法，其值必须为"value" -->
     </select>

 </mapper>

StudentDao.xml

在dao中使用的别名在大配置文件中设置别名：

 <?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>
     <!-- 配置cn.zym.mybatis.entity包下的所有bean的别名为简单类名； -->
     <typeAliases>
         <package name="cn.zym.mybatis.entity"/>
     </typeAliases>

     <environments default="development">
         <environment id="development">
             <transactionManager type="JDBC" />
             <dataSource type="POOLED">
                 <property name="driver" value="com.mysql.jdbc.Driver" />
                 <property name="url" value="jdbc:mysql://localhost:3306/zhangyiming" />
                 <property name="username" value="zym" />
                 <property name="password" value="admin" />
             </dataSource>
         </environment>
     </environments>
     <mappers>
         <mapper resource="cn/zym/mybatis/dao/StudentDao.xml" />
     </mappers>
 </configuration>

Mybatis-config.xml

这两个文件中的头文件都可以到附带的pdf文档中获取   Getting started目录节点下可找到；

StudentDaoImpl

 package cn.zym.mybatis.dao.impl;

 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 cn.zym.mybatis.dao.IStudentDao;
 import cn.zym.mybatis.entity.Student;
 import cn.zym.mybatis.utils.MybatisUtils;

 public class StudentDaoImpl implements IStudentDao {

     /*@Override
     public int SaveInfo(Student stu) throws IOException {
         Reader reader = Resources.getResourceAsReader("mybatis-config.xml");
         SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
         SqlSession session = factory.openSession();
         int insert = session.insert("addStudent",stu);
         session.commit();
         session.close();
         return insert;
     }*/

     @Override
     public int SaveInfo(Student stu) throws IOException {
         SqlSession sqlSession = MybatisUtils.getSqlSession();
         int insert = sqlSession.insert("addStudent",stu);
         sqlSession.commit();
         sqlSession.close();
         return insert;
     }

     @Override
     public int DeleteInfo(int stuno) throws IOException {
         SqlSession sqlSession = MybatisUtils.getSqlSession();
         int delete = sqlSession.delete("deleteInfo",stuno);
         sqlSession.commit();
         return delete;
     }

     @Override
     public List<Student> getAllInfoByStudent(Student stu) throws IOException {
         SqlSession sqlSession = MybatisUtils.getSqlSession();
         List<Student> list = sqlSession.selectList("getAllInfoByStudent",stu);
         return list;
     }

     @Override
     public List<Student> getAllInfoByName(String stuName) throws IOException {
         SqlSession sqlSession = MybatisUtils.getSqlSession();
         List<Student> list = sqlSession.selectList("getAllInfoByName",stuName);
         return list;
     }

 }

StudentDaoImpl

MybatisUtils

 package cn.zym.mybatis.utils;

 import java.io.IOException;
 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;

 public class MybatisUtils {
     static Reader reader =null;

     static{
         try {
             reader = Resources.getResourceAsReader("mybatis-config.xml");
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
     static SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(reader);
     public static SqlSession getSqlSession(){
         SqlSession session = factory.openSession();
         return session;

     }

 }

MybatisUtils

测试code

 package cn.zym.mybatis.test;

 import java.io.IOException;
 import java.util.List;

 import org.junit.Before;
 import org.junit.Test;

 import cn.zym.mybatis.dao.IStudentDao;
 import cn.zym.mybatis.dao.impl.StudentDaoImpl;
 import cn.zym.mybatis.entity.Student;

 public class Mytest {
     IStudentDao dao ;
     @Before
     public void initalData(){
         dao=  new StudentDaoImpl();
     }

     /**
      * 模糊  姓名  查询学生信息
      */
     @Test
     public void queryStudentByBean() throws IOException{
         List<Student> list = dao.getAllInfoByStudent(new Student("zym2",));
         for (Student student : list) {
             System.out.println(student);
         }
         System.out.println("ok!");
     }

     /**
      * 模糊  姓名  查询学生信息
      */
     @Test
     public void queryStudentByString() throws IOException{
         List<Student> list = dao.getAllInfoByName("");
         for (Student student : list) {
             System.out.println(student);
         }
         System.out.println("ok!");
     }

     /**
      * 删除学生信息
      */
     @Test
     public void deleteStudent() throws IOException{
         dao.DeleteInfo();
         System.out.println("ok!");
     }

     /**
      * 添加学生信息
      * @throws IOException
      */
     @Test
     public void addStudent() throws IOException{
         IStudentDao dao =  new StudentDaoImpl();
         Student stu = new Student("zym", );
         System.out.println("保存前："+stu);
         dao.SaveInfo(stu);
         System.out.println("save ok!");
         System.out.println("保存后："+stu);
     }
 }

test code