mybatis简单的curd操作以及转账操作

使用mybatis框架进行简单的curd操作以及转账操作 数据库接口请参照下面的pojo类进行创建即可

代码如下

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.itheiama</groupId>
    <artifactId>mybatis03</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
    </dependencies>

</project>

数据库信息 jdbcConfig.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybaties
username=root
password=123456

log4j基本配置(log4j.properties)

### 全局日志等级配置,输出位置配置###
log4j.rootLogger=debug,stdout 
### 输出信息到控制台 ###
# 配置日志信息输出目的地Appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.Target=System.out  
# 配置日志信息的格式布局（layout）
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

pojo实体类

package com.itheima.domain;

import java.io.Serializable;
import java.util.Date;
/**
* @Description 用户实体类
* @Params
* @Return
* @Author Xu Feng
* @Date 2019/9/15 12:04
**/

public class User implements Serializable {

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

    public Float getMoney() {
        return money;
    }

    public void setMoney(Float money) {
        this.money = money;
    }

    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 + '\'' +
                ", money=" + money +
                '}';
    }
}

接口类 (dao层)

package com.itheima.dao;

import com.itheima.domain.User;

import java.util.List;

/**
* @Description 用户持久层
* @Params
* @Return
* @Author Xu Feng
* @Date 2019/9/15 12:03
**/
public interface IUserDao {
    /**
    * @Description 查找所有
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/15 12:03
    **/
    List<User> findAll();

    /**
    * @Description 根据姓名查找
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/26 21:42
    **/
    List<User> findByName(String name);

    /**
    * @Description 获取用户的金钱
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/26 23:24
    **/

    float getMoney(User user);

    /**
    * @Description 转账操作
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/26 21:58
    **/
    void updateByName(User user);

}

mybatis映射文件

<?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">
<!-- 主配置文件 -->
<configuration>
    <!-- 引用数据库配置文件 -->
    <properties resource="JDBCConfig.properties"></properties>
    <!-- 类起别名 -->
    <typeAliases>
        <package name="com.itheima.domain"/>
    </typeAliases>
    <!-- 数据库配置 -->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <!-- 数据库配置 -->
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 映射配置 -->
    <mappers>
        <mapper resource="com/itheima/dao/UserDao.xml"></mapper>
    </mappers>
</configuration>

test测试类

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

import java.io.InputStream;

import java.util.List;

public class TestMybatis {

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

    @Before
    public void init() throws Exception{
        in = Resources.getResourceAsStream("SqlMapConfig.xml");
        factory = new SqlSessionFactoryBuilder().build(in);
        sqlSession = factory.openSession();
        userDao = sqlSession.getMapper(IUserDao.class);
    }

    @After
    public void destory() throws Exception{
        sqlSession.commit();
        in.close();
        sqlSession.close();
    }

    @Test
    public void testFindAll(){
        List<User> users = userDao.findAll();
        for (User user : users){
            System.out.println(user);
        }
    }

    @Test
    public void testFindByName(){
        User user = new User();
        user.setUsername("eee");
        List<User> users = userDao.findByName(user.getUsername());
        System.out.println(users.isEmpty()?null:users.get(0));
    }

    /**
    * @Description 获取用户的金钱
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/26 23:21
    **/

    public float getMoney(String name){
        User user = new User();
        user.setUsername(name);
        return userDao.getMoney(user);
    }

    /**
    * @Description 实现转账操作
    * @Params
    * @Return
    * @Author Xu Feng
    * @Date 2019/9/26 23:22
    **/

    public void Tranform(String topeople,String inpeople, Float money){
        User inuser = new User();
        inuser.setUsername(topeople);
        inuser.setMoney(this.getMoney(topeople)-100f);
        userDao.updateByName(inuser);
        User touser = new User();
        touser.setUsername(inpeople);
        touser.setMoney(this.getMoney(inpeople)+100f);
        userDao.updateByName(touser);
    }

    @Test
    public void testTransform(){
        this.Tranform("eee","shown",100f);
    }


}