发表于： 2019-12-24 12:52:04

1 982

今天完成的事情：

1.加过service层的代码

1）目录

2）代码

User

package com.wp.sm.beans;

public class User {
    private int id;
    private String name;
    private String pwd;
    public  User(){};
    public  User(String name,String pwd){
        this.name=name;
        this.pwd=pwd;
    }
    public  User(String name,String pwd,int id){
        this.name=name;
        this.pwd=pwd;
        this.id=id;
    }

    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPwd() {
        return pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", name=" + name + ", pwd=" + pwd + "]";
    }
}

UserMapper

package com.wp.sm.mapper;

import com.wp.sm.beans.User;

import java.util.List;

public interface UserMapper {

    public int insertUser(User user) throws Exception;

    public int updateUser(User user) throws Exception;

    public int deleteUser(int id) throws Exception;

    public User selectUserById(int id) throws Exception;

    public List<User> selectAllUser() throws Exception;
}

UserMapper.xml

<mapper namespace="test">
    <insert id="insertUser" parameterType="com.wp.sm.beans.User">
        insert into user (name,pwd)
        values (#{name}, #{pwd})
    </insert>

    <update id="updateUser" parameterType="com.wp.sm.beans.User">
        update user
        set name=#{name},
            pwd=#{pwd}
        where id = #{id}
    </update>

    <delete id="deleteUser" parameterType="int">
        delete
        from user
        where id = #{id}
    </delete>

    <select id="selectUserById" parameterType="int" resultType="com.wp.sm.beans.User">
        select *
        from user
        where id = #{id}
    </select>

    <select id="selectAllUser" parameterType="com.wp.sm.beans.User" resultType="com.wp.sm.beans.User">
        select *
        from user
    </select>
</mapper>

UserService

package com.wp.sm.service;

import com.wp.sm.beans.User;

import java.util.List;

public interface UserService {
    public int insertUser(User user) throws Exception;

    public int updateUser(User user) throws Exception;

    public int deleteUser(int id) throws Exception;

    public User selectUserById(int id) throws Exception;

    public List<User> selectAllUser() throws Exception;
}

UserServiceImpl

package com.wp.sm.service.impl;

import com.wp.sm.beans.User;
import com.wp.sm.service.UserService;
import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;

public class UserServiceImpl extends SqlSessionDaoSupport implements UserService {
    @Override
    public int insertUser(User user) throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        int insert = sqlSession.insert("test.insertUser", user);
        return insert;
    }

    @Override
    public int updateUser(User user) throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        int update = sqlSession.update("test.updateUser", user);
        return update;
    }

    @Override
    public int deleteUser(int id) throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        int del = sqlSession.delete("test.deleteUser", id);
        return del;
    }

    @Override
    public User selectUserById(int id) throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        User user = sqlSession.selectOne("test.selectUserById", id);
        return user;
    }

    @Override
    public List<User> selectAllUser() throws Exception {
        SqlSession sqlSession = this.getSqlSession();
        List<User> user = sqlSession.selectList("test.selectAllUser");
        return user;
    }
}

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd">
    <!-- 加载配置文件 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driver}"/>
        <property name="jdbcUrl" value="${url}"/>
        <property name="user" value="${username}"/>
        <property name="password" value="${password}"/>
    </bean>

    <!-- sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 加载 MyBatis 的配置文件 -->
        <property name="configLocation" value="mybatis.xml"/>
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <bean id="UserServiceImpl" class="com.wp.sm.service.impl.UserServiceImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>

mybatis.xml

<?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>
    <!--mybatis.xml里注册UserMapper.xml文件-->
    <mappers>
        <mapper resource="com/wp/sm/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

db.properties

username=root
password=19980710
url=jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8
driver=com.mysql.cj.jdbc.Driver

UserServiceTest

import com.wp.sm.beans.User;
import com.wp.sm.service.UserService;
import org.junit.Before;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class UserServiceTest {
    private ApplicationContext applicationContext;

    // 在执行测试方法之前首先获取 Spring 配置文件对象
    // 注解@Before在执行本类所有测试方法之前先调用这个方法
    @Before
    public void setup() throws Exception {
        applicationContext = new
                ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    }

    @Test
    public void selectUserById() throws Exception {
        // 通过配置资源对象获取 userService 对象
        UserService userService = (UserService) applicationContext.getBean("UserServiceImpl");
        // 调用 UserMapper 的方法
        User user = userService.selectUserById(1);
        // 输出用户信息
        System.out.println(user.toString());
    }

    @Test
    public void selectAllUser() throws Exception {
        // 通过配置资源对象获取 userService 对象
        UserService userService = (UserService) applicationContext.getBean("UserServiceImpl");
        // 调用 UserMapper 的方法
        List<User> user = userService.selectAllUser();
        // 输出用户信息
        System.out.println(user.toString());
    }

    @Test
    public void deleteUser() throws Exception {
        // 通过配置资源对象获取 userService 对象
        UserService userService = (UserService) applicationContext.getBean("UserServiceImpl");
        userService.deleteUser(10);
    }

    @Test
    public void updateUser() throws Exception {
        // 通过配置资源对象获取 userService 对象
        UserService userService = (UserService) applicationContext.getBean("UserServiceImpl");
        User user = new User();
        user.setName("万万");
        user.setPwd("111111");
        user.setId(3);
        userService.updateUser(user);
    }

    @Test
    public void insertUser() throws Exception {
        // 通过配置资源对象获取 userService 对象
        UserService userService = (UserService) applicationContext.getBean("UserServiceImpl");
        User user = new User();
        user.setName("peter");
        user.setPwd("111111");
        userService.insertUser(user);
    }
}

2.注解的方法

在service层的实现类加了@Service注解

@Service
public class UserServiceImpl extends SqlSessionDaoSupport implements UserService 

在spring的配置文件中加了bean

<bean id="UserServiceImpl" class="com.wp.sm.service.impl.UserServiceImpl">
    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

使用注解之后的实现类

import com.wp.sm.beans.User;
import com.wp.sm.service.UserService;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;

public class UserServiceTest {

    @Autowired
    UserService userService;

    @Test
    public void selectUserById() throws Exception {
        User user = userService.selectUserById(1);
        // 输出用户信息
        System.out.println(user.toString());
    }

    @Test
    public void selectAllUser() throws Exception {
        List<User> user = userService.selectAllUser();
        // 输出用户信息
        System.out.println(user.toString());
    }

    @Test
    public void deleteUser() throws Exception {
        userService.deleteUser(10);
    }

    @Test
    public void updateUser() throws Exception {
        User user = new User();
        user.setName("万万");
        user.setPwd("111111");
        user.setId(3);
        userService.updateUser(user);
    }

    @Test
    public void insertUser() throws Exception {
        User user = new User();
        user.setName("peter");
        user.setPwd("111111");
        userService.insertUser(user);
    }
}

明天计划的事情： 再好好学一下注解的使用和log4j，修改代码
遇到的问题： 对注解的理解还是不足
收获：

多态性

1.理解多态性：可以理解为一个事物的多种形态
2.何为多态性
    对象的多态性：父类的引用指向子类的对象（或者子类的对象赋给父类的引用）
    例如：Person p1 = new Man ( ) ;
3.多态的使用：当调用子父类同名同参数的方法时，实际执行的是子类重写父类的方法---虚拟方法调用。编译期，调用父类声明的方法。执行期，执行子类重写父类的方法。
4.多态性的使用前提：类的继承关系，方法的重写。 



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