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>

 

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>

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;
    }

}

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;
        
    }
    
    
    
}

 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",21));
        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("3");
        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(4);
        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", 21);
        System.out.println("保存前："+stu);
        dao.SaveInfo(stu);
        System.out.println("save ok!");
        System.out.println("保存后："+stu);
    }
}