Mybatis二

今日内容

• 一、自定义Mybatis框架基于注解开发
• • 1.回顾自定义mybatis的流程分析
  • 2.基于注解的自定义再分析
• 二、使用Mybatis完成CRUD
• • 1.回顾Mybatis的环境搭建-实现查询所有功能
  • 2.Mybatis的CRUD-保存操作
  • 3.Mybatis的CRUD-修改和删除操作
  • 4.Mybatis的CRUD-查询一个和模糊查询
  • 5.Mybatis的CRUD-查询返回一行一列和占位符分析
  • 6.Mybatis的CRUD-保存操作的细节-获取保存数据的id
  • 7.Mybatis中参数的深入-使用实体类的包装对象作为查询条件
  • 8.Mybatis中的返回值深入-解决实体类属性和数据库列名不对应的两种方式
• 三、使用Mybatis完成DAO层的开发
• • 1.Mybatis中编写dao实现类的使用方式-查询列表
  • 2.Mybatis中编写dao实现类的使用-保存操作
  • 3.Mybatis中编写dao实现类的使用-修改删除等其他操作
  • 4.properties标签的使用及细节
  • 5.typeAliases标签和package标签

---

一、自定义Mybatis框架基于注解开发 1.回顾自定义mybatis的流程分析

2.基于注解的自定义再分析

二、使用Mybatis完成CRUD 1.回顾Mybatis的环境搭建-实现查询所有功能

// log4j.properties
# Set root category priority to INFO and its only appender to CONSOLE.
#log4j.rootCategory=INFO, CONSOLE            debug   info   warn error fatal
log4j.rootCategory=debug, CONSOLE, LOGFILE

# Set the enterprise logger category to FATAL and its only appender to CONSOLE.
log4j.logger.org.apache.axis.enterprise=FATAL, CONSOLE

# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %mn

# LOGFILE is set to be a File appender using a PatternLayout.
log4j.appender.LOGFILE=org.apache.log4j.FileAppender
log4j.appender.LOGFILE.File=d:axis.log
log4j.appender.LOGFILE.Append=true
log4j.appender.LOGFILE.layout=org.apache.log4j.PatternLayout
log4j.appender.LOGFILE.layout.ConversionPattern=%d{ISO8601} %-6r [%15.15t] %-5p %30.30c %x - %mn

    4.0.0

    com.itheima
    day01_eesy_01mybatis
    1.0-SNAPSHOT
    jar

    
        
            org.mybatis
            mybatis
            3.4.5
        
        
            mysql
            mysql-connector-java
            5.1.6
        
        
            log4j
            log4j
            1.2.12
        
        
            junit
            junit
            4.10
        
    

    
    
        select * from user
    

package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;


public class User implements Serializable{

    private Integer id;
    private String username;
    private Date birthday;
    private String sex;
    private String address;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", birthday=" + birthday +
                ", sex='" + sex + ''' +
                ", address='" + address + ''' +
                '}';
    }
}

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();
}

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {

    
    public static void main(String[] args)throws Exception {
        //1.读取配置文件
        InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.创建SqlSessionFactory工厂
        SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
        SqlSessionFactory factory = builder.build(in);
        //3.使用工厂生产SqlSession对象
        SqlSession session = factory.openSession();
        //4.使用SqlSession创建Dao接口的代理对象
        IUserDao userDao = session.getMapper(IUserDao.class);
        //5.使用代理对象执行方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }
        //6.释放资源
        session.close();
        in.close();
    }
}

2.Mybatis的CRUD-保存操作

    
    
        select * from user
    

    
    
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    

 
package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);
}

 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        //5.执行保存方法
        userDao.saveUser(user);
    }
}

 
3.Mybatis的CRUD-修改和删除操作 




    
    
        
        
            
            
            
            
                
                
                
                
                
            
        
    

    
    
        
    

 



    
    
        select * from user
    

    
    
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    
    
    
    
        update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
    

    
    
        delete from user where id = #{uid}
    

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);

    
    void updateUser(User user);

    
    void deleteUser(Integer userId);
}

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setUserAddress("北京市顺义区");
        user.setUserSex("男");
        user.setUserBirthday(new Date());
        //5.执行保存方法
        userDao.saveUser(user);
    }

    
    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(50);
        user.setUserName("mybastis update user");
        user.setAddress("北京市顺义区");
        user.setSex("女");
        user.setBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(48);
    }
}

4.Mybatis的CRUD-查询一个和模糊查询

    
    
        select * from user
    

    
    
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    
    
    
    
        update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
    

    
    
        delete from user where id = #{uid}
    

    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
        
   

 
package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);

    
    void updateUser(User user);

    
    void deleteUser(Integer userId);

    
    User findById(Integer userId);

    
    List findByName(String username);

}

 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        //5.执行保存方法
        userDao.saveUser(user);
    }

    
    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(50);
        user.setUserName("mybastis update user");
        user.setAddress("北京市顺义区");
        user.setSex("女");
        user.setBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(48);
    }

    
    @Test
    public void testFindOne(){
        //5.执行查询一个方法
        User user = userDao.findById(50);
        System.out.println(user);
    }

    
    @Test
    public void testFindByName(){
        //5.执行查询一个方法
        List users = userDao.findByName("%王%");
//        List users = userDao.findByName("王");
        for(User user : users){
            System.out.println(user);
        }
    }
}

 
 
5.Mybatis的CRUD-查询返回一行一列和占位符分析 




    
    
        
        
            
            
            
            
                
                
                
                
                
            
        
    

    
    
        
    

 



    
    
        select * from user
    

    
    
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    
    
    
    
        update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
    

    
    
        delete from user where id = #{uid}
    

    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
        
   

    
    
        select count(id) from user;
    

 
package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);

    
    void updateUser(User user);

    
    void deleteUser(Integer userId);

    
    User findById(Integer userId);

    
    List findByName(String username);

    
    int findTotal();
}

 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        //5.执行保存方法
        userDao.saveUser(user);
    }

    
    @Test
    public void testUpdate(){
        User user = new User();
        user.setUserId(50);
        user.setUserName("mybastis update user");
        user.setAddress("北京市顺义区");
        user.setSex("女");
        user.setBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(48);
    }

    
    @Test
    public void testFindOne(){
        //5.执行查询一个方法
        User user = userDao.findById(50);
        System.out.println(user);
    }

    
    @Test
    public void testFindByName(){
        //5.执行查询一个方法
        List users = userDao.findByName("%王%");
//        List users = userDao.findByName("王");
        for(User user : users){
            System.out.println(user);
        }
    }

    
    @Test
    public void testFindTotal(){
        //5.执行查询一个方法
        int count = userDao.findTotal();
        System.out.println(count);
    }
}

 
6.Mybatis的CRUD-保存操作的细节-获取保存数据的id 




    
    
        
        
            
            
            
            
                
                
                
                
                
            
        
    

    
    
        
    

 



    
    
        select * from user
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);
}

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        System.out.println("保存操作之前："+user);
        //5.执行保存方法
        userDao.saveUser(user);

        System.out.println("保存操作之后："+user);
    }
}

7.Mybatis中参数的深入-使用实体类的包装对象作为查询条件

OGNL表达式：
Object Graphic Navigation Language
对象	图	导航	   语言
它是通过对象的取值方法来获取数据。在写法上把get给省略了。
比如：我们获取用户的名称
	类中的写法：user.getUsername();
	OGNL表达式写法：user.username
mybatis中为什么能直接写username,而不用user.呢：
	因为在parameterType中已经提供了属性所属的类，所以此时不需要写对象名

    
    
        select * from user
    

    
    
        select * from user where username like #{user.username}
    

package com.itheima.domain;


public class QueryVo {

    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
}

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();
    
    
    List findUserByVo(QueryVo vo);
}

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
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 java.io.InputStream;
import java.util.List;


public class MybatisTest {
    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }
    
   
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testFindByVo(){
        QueryVo vo = new QueryVo();
        User user = new User();
        user.setUserName("%王%");
        vo.setUser(user);
        //5.执行查询一个方法
        List users = userDao.findUserByVo(vo);
        for(User u : users){
            System.out.println(u);
        }
    }
}

8.Mybatis中的返回值深入-解决实体类属性和数据库列名不对应的两种方式

    
    
        
        
        
        
        
        
        
    


    
    
        
        select * from user;
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{userName},#{userAddress},#{userSex},#{userBirthday});
    

    
    
        update user set username=#{userName},address=#{userAddress},sex=#{userAex},birthday=#{userBirthday} where id=#{userId}
    

    
    
        delete from user where id = #{uid}
    
    
    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
        
   

    
    
        select count(id) from user;
    

    
    
        select * from user where username like #{user.username}
    

 
package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;


public class User implements Serializable {

    private Integer userId;
    private String userName;
    private String userAddress;
    private String userSex;
    private Date userBirthday;

    public Integer getUserId() {
        return userId;
    }

    public void setUserId(Integer userId) {
        this.userId = userId;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getUserAddress() {
        return userAddress;
    }

    public void setUserAddress(String userAddress) {
        this.userAddress = userAddress;
    }

    public String getUserSex() {
        return userSex;
    }

    public void setUserSex(String userSex) {
        this.userSex = userSex;
    }

    public Date getUserBirthday() {
        return userBirthday;
    }

    public void setUserBirthday(Date userBirthday) {
        this.userBirthday = userBirthday;
    }

    @Override
    public String toString() {
        return "User{" +
                "userId=" + userId +
                ", userName='" + userName + ''' +
                ", userAddress='" + userAddress + ''' +
                ", userSex='" + userSex + ''' +
                ", userBirthday=" + userBirthday +
                '}';
    }
}

 
package com.itheima.domain;


public class QueryVo {

    private User user;

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }
}

 
package com.itheima.dao;

import com.itheima.domain.QueryVo;
import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);

    
    void updateUser(User user);

    
    void deleteUser(Integer userId);

    
    User findById(Integer userId);

    
    List findByName(String username);

    
    int findTotal();

    
    List findUserByVo(QueryVo vo);
}

 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.domain.QueryVo;
import com.itheima.domain.User;
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 org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;


public class MybatisTest {

    private InputStream in;
    private SqlSession sqlSession;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.获取SqlSession对象
        sqlSession = factory.openSession();
        //4.获取dao的代理对象
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //提交事务
        sqlSession.commit();
        //6.释放资源
        sqlSession.close();
        in.close();
    }

    
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }

    
    @Test
    public void testSave(){
        User user = new User();
        user.setUserName("modify User property");
        user.setUserAddress("北京市顺义区");
        user.setUserSex("男");
        user.setUserBirthday(new Date());
        System.out.println("保存操作之前："+user);
        //5.执行保存方法
        userDao.saveUser(user);

        System.out.println("保存操作之后："+user);
    }

    
    @Test
    public void testUpdate(){
        User user = new User();
        user.setUserId(50);
        user.setUserName("mybastis update user");
        user.setUserAddress("北京市顺义区");
        user.setUserSex("女");
        user.setUserBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(48);
    }

    
    @Test
    public void testFindOne(){
        //5.执行查询一个方法
        User  user = userDao.findById(50);
        System.out.println(user);
    }

    
    @Test
    public void testFindByName(){
        //5.执行查询一个方法
        List users = userDao.findByName("%王%");
//        List users = userDao.findByName("王");
        for(User user : users){
            System.out.println(user);
        }
    }

    
    @Test
    public void testFindTotal(){
        //5.执行查询一个方法
        int count = userDao.findTotal();
        System.out.println(count);
    }


    
    @Test
    public void testFindByVo(){
        QueryVo vo = new QueryVo();
        User user = new User();
        user.setUserName("%王%");
        vo.setUser(user);
        //5.执行查询一个方法
        List users = userDao.findUserByVo(vo);
        for(User u : users){
            System.out.println(u);
        }
    }
}

 
三、使用Mybatis完成DAO层的开发 
1.Mybatis中编写dao实现类的使用方式-查询列表 


    4.0.0

    com.itheima
    day02_eesy_02mybatsiDAO
    1.0-SNAPSHOT
    jar

    
        
            org.mybatis
            mybatis
            3.4.5
        

        
            mysql
            mysql-connector-java
            5.1.6
        

        
            log4j
            log4j
            1.2.12
        

        
            junit
            junit
            4.10
        
    


 



    
    
        
        
            
            

            
            
                
                
                
                
            
        
    
    
    
        
    

 




    
    
        select * from user;
    

package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;


public class User implements Serializable {

    private Integer id;
    private String username;
    private String address;
    private String sex;
    private Date birthday;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", address='" + address + ''' +
                ", sex='" + sex + ''' +
                ", birthday=" + birthday +
                '}';
    }
}

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();
}

package com.itheima.dao.impl;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;


public class UserDaoImpl implements IUserDao {

    private SqlSessionFactory factory;

    public UserDaoImpl(SqlSessionFactory factory){
        this.factory = factory;
    }

    @Override
    public List findAll() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findAll");//参数就是能获取配置信息的key
        //3.释放资源
        session.close();
        return users;
    }
}

package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.dao.impl.UserDaoImpl;
import com.itheima.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;


public class MybatisTest {

    private InputStream in;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.使用工厂对象，创建dao对象
        userDao = new UserDaoImpl(factory);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //6.释放资源
        in.close();
    }

    
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }
}

2.Mybatis中编写dao实现类的使用-保存操作

    
    
        select * from user;
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    

 
package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);
}

 
package com.itheima.dao.impl;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;


public class UserDaoImpl implements IUserDao {

    private SqlSessionFactory factory;

    public UserDaoImpl(SqlSessionFactory factory){
        this.factory = factory;
    }

    @Override
    public List findAll() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findAll");//参数就是能获取配置信息的key
        //3.释放资源
        session.close();
        return users;
    }

    @Override
    public void saveUser(User user) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现保存
        session.insert("com.itheima.dao.IUserDao.saveUser",user);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }
}
 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.dao.impl.UserDaoImpl;
import com.itheima.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;


public class MybatisTest {

    private InputStream in;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.使用工厂对象，创建dao对象
        userDao = new UserDaoImpl(factory);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //6.释放资源
        in.close();
    }

    
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }
    
    @Test
    public void testSave(){
        User user = new User();
        user.setUsername("dao impl user");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        System.out.println("保存操作之前："+user);
        //5.执行保存方法
        userDao.saveUser(user);

        System.out.println("保存操作之后："+user);
    }
}

 
3.Mybatis中编写dao实现类的使用-修改删除等其他操作 




    
    
        select * from user;
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{username},#{address},#{sex},#{birthday});
    

    
    
        update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
    

    
    
        delete from user where id = #{uid}
    
    
    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
   

    
    
        select count(id) from user;
    

 
package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;


public interface IUserDao {

    
    List findAll();

    
    void saveUser(User user);

    
    void updateUser(User user);

    
    void deleteUser(Integer userId);

    
    User findById(Integer userId);

    
    List findByName(String username);

    
    int findTotal();

}

 
package com.itheima.dao.impl;

import com.itheima.dao.IUserDao;
import com.itheima.domain.User;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import java.util.List;


public class UserDaoImpl implements IUserDao {

    private SqlSessionFactory factory;

    public UserDaoImpl(SqlSessionFactory factory){
        this.factory = factory;
    }

    @Override
    public List findAll() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findAll");//参数就是能获取配置信息的key
        //3.释放资源
        session.close();
        return users;
    }

    @Override
    public void saveUser(User user) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现保存
        session.insert("com.itheima.dao.IUserDao.saveUser",user);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public void updateUser(User user) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现更新
        session.update("com.itheima.dao.IUserDao.updateUser",user);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public void deleteUser(Integer userId) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用方法实现更新
        session.update("com.itheima.dao.IUserDao.deleteUser",userId);
        //3.提交事务
        session.commit();
        //4.释放资源
        session.close();
    }

    @Override
    public User findById(Integer userId) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询一个
        User user = session.selectOne("com.itheima.dao.IUserDao.findById",userId);
        //3.释放资源
        session.close();
        return user;
    }

    @Override
    public List findByName(String username) {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询列表
        List users = session.selectList("com.itheima.dao.IUserDao.findByName",username);
        //3.释放资源
        session.close();
        return users;
    }

    @Override
    public int findTotal() {
        //1.根据factory获取SqlSession对象
        SqlSession session = factory.openSession();
        //2.调用SqlSession中的方法，实现查询一个
        Integer count = session.selectOne("com.itheima.dao.IUserDao.findTotal");
        //3.释放资源
        session.close();
        return count;
    }
}

 
package com.itheima.test;

import com.itheima.dao.IUserDao;
import com.itheima.dao.impl.UserDaoImpl;
import com.itheima.domain.User;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.io.InputStream;
import java.util.Date;
import java.util.List;


public class MybatisTest {

    private InputStream in;
    private IUserDao userDao;

    @Before//用于在测试方法执行之前执行
    public void init()throws Exception{
        //1.读取配置文件，生成字节输入流
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        //2.获取SqlSessionFactory
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
        //3.使用工厂对象，创建dao对象
        userDao = new UserDaoImpl(factory);
    }

    @After//用于在测试方法执行之后执行
    public void destroy()throws Exception{
        //6.释放资源
        in.close();
    }

    
    @Test
    public void testFindAll(){
        //5.执行查询所有方法
        List users = userDao.findAll();
        for(User user : users){
            System.out.println(user);
        }

    }
    
    @Test
    public void testSave(){
        User user = new User();
        user.setUsername("dao impl user");
        user.setAddress("北京市顺义区");
        user.setSex("男");
        user.setBirthday(new Date());
        System.out.println("保存操作之前："+user);
        //5.执行保存方法
        userDao.saveUser(user);

        System.out.println("保存操作之后："+user);
    }

    
    @Test
    public void testUpdate(){
        User user = new User();
        user.setId(50);
        user.setUsername("userdaoimpl update user");
        user.setAddress("北京市顺义区");
        user.setSex("女");
        user.setBirthday(new Date());

        //5.执行保存方法
        userDao.updateUser(user);
    }

    
    @Test
    public void testDelete(){
        //5.执行删除方法
        userDao.deleteUser(54);
    }

    
    @Test
    public void testFindOne(){
        //5.执行查询一个方法
        User  user = userDao.findById(50);
        System.out.println(user);
    }

    
    @Test
    public void testFindByName(){
        //5.执行查询一个方法
        List users = userDao.findByName("%王%");
        for(User user : users){
            System.out.println(user);
        }
    }

    
    @Test
    public void testFindTotal(){
        //5.执行查询一个方法
        int count = userDao.findTotal();
        System.out.println(count);
    }
}

 
4.properties标签的使用及细节 



    
    
       
    

    
    
        
        
            
            

            
            
                
                
                
                
            
        
    
    
    
        
    

 
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/eesy_mybatis
jdbc.username=root
jdbc.password=1234
 
5.typeAliases标签和package标签 



    
    
       
    

    
    
        

        
        
    

    
    
        
        
            
            

            
            
                
                
                
                
            
        
    
    
    
        
        
        
    

 




    
    
        
        
        
        
        
        
        
    


    
    
        
        select * from user;
    

    
    
        
        
            select last_insert_id();
        
        insert into user(username,address,sex,birthday)values(#{userName},#{userAddress},#{userSex},#{userBirthday});
    

    
    
        update user set username=#{userName},address=#{userAddress},sex=#{userAex},birthday=#{userBirthday} where id=#{userId}
    

    
    
        delete from user where id = #{uid}
    
    
    
    
        select * from user where id = #{uid}
    

    
    
          select * from user where username like #{name}
        
   

    
    
        select count(id) from user;
    

    
    
        select * from user where username like #{user.username}