JAVA EE——案例：员工管理系统

1.题目

在数据库创建一个employee表，在MyBatis环境下完成一个员工管理系统。该系统实现以下几个功能。

（1）在MyBatisTest测试类中添加findByIdTest()方法，用于根据id查询员工信息。

（2）在MyBatisTest测试类中添加insertEmployeeTest()方法，用于新增员工信息。

（3）在MyBatisTest测试类中添加updateEmployeeTest()方法，用于根据id更新员工信息。

（4）在MyBatisTest测试类中添加deleteEmployeeTest()方法，用于根据id删除员工信息。
员工编号（id）员工名称（name）员工年龄（age）员工职位（position）1张三20员工2李四18员工3王五35经理

2.文件目录

3. 引入依赖——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">
    <parent>
        <artifactId>mybatistest</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.example1</groupId>
    <artifactId>Mybatis_demo2</artifactId>

    <packaging>jar</packaging>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

4.配置文件——myBatis-config.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>

    <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/mybatis"/>
                <property name="username" value="root"/>
                <property name="password" value="12345678"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper resource="mappers/EmployeeMapper.xml"/>
    </mappers>
</configuration>

5.映射文件——EmployeeMapper.xml

<?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="org.example1.mapper.EmployeeMapper">

    <select id="findById" resultType="org.example1.pojo.Employee">
        select * from employee where id = 01
    </select>

    <insert id="insertEmployee">
        insert into employee values(02,'李四',18,'员工')
    </insert>

    <update id="updateEmployee">
        update employee set name='刘六',age=27,position='经理' where id=02
    </update>

    <delete id="deleteEmployee">
        delete from employee where id = 03
    </delete>
</mapper>

6.java类——Employee.java

package org.example1.pojo;

public class Employee {
    private Integer id;
    private String name;
    private Integer age;
    private String position;

    public Employee(Integer id, String name, Integer age, String position) {
        this.id = id;
        this.name = name;
        this.age = age;
        this.position = position;
    }

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getPosition() {
        return position;
    }

    public void setPosition(String position) {
        this.position = position;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", position='" + position + '\'' +
                '}';
    }
}

7.接口类——EmployeeMapper.java

package org.example1.mapper;

import org.example1.pojo.Employee;

public interface EmployeeMapper {
    //新增员工信息
    int insertEmployee();
    //根据id查询员工信息
    Employee findById();
    //更新员工信息
    void updateEmployee();
    //删除员工信息
    void deleteEmployee();
}

8.测试类——MyBatisTest.java

（1）根据id查询员工信息

package org.example1.test;

import org.example1.mapper.EmployeeMapper;
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.example1.pojo.Employee;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;

public class MyBatisTest {
    @Test
    public void insertEmployeeTest() throws IOException {
        //加载核心配置文件
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        //获取SqlSessionFactoryBuilder
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //获取SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
        //获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //获取mapper接口对象
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //测试功能
        int result = mapper.insertEmployee();
        //提交事务
        //sqlSession.commit();
        System.out.println("result:"+result);
    }

    @Test
    public void findByIdTest() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //mapper.updateEmployee();
        //mapper.deleteEmployee();
        Employee employee = mapper.findById();
        System.out.println(employee);
    }
}

（2）新增员工信息

package org.example1.test;

import org.example1.mapper.EmployeeMapper;
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.Test;
import java.io.IOException;
import java.io.InputStream;

public class MyBatisTest {
    @Test
    public void insertEmployeeTest() throws IOException {
        //加载核心配置文件
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        //获取SqlSessionFactoryBuilder
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //获取SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
        //获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //获取mapper接口对象
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //测试功能
        int result = mapper.insertEmployee();
        //提交事务
        //sqlSession.commit();
        System.out.println("result:"+result);
    }

    /*@Test
    public void updateEmployeeTest() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        mapper.updateEmployee();
        //mapper.deleteEmployee();
        //Employee employee = mapper.findById();
        //System.out.println(employee);
    }*/
}

（3）根据id更新员工信息

package org.example1.test;

import org.example1.mapper.EmployeeMapper;
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.example1.pojo.Employee;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;

public class MyBatisTest {
    @Test
    public void insertEmployeeTest() throws IOException {
        //加载核心配置文件
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        //获取SqlSessionFactoryBuilder
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //获取SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
        //获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //获取mapper接口对象
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //测试功能
        int result = mapper.insertEmployee();
        //提交事务
        //sqlSession.commit();
        System.out.println("result:"+result);
    }

    @Test
    public void updateEmployeeTest() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        mapper.updateEmployee();
        //mapper.deleteEmployee();
        //Employee employee = mapper.findById();
        //System.out.println(employee);
    }
}

（4）根据id删除员工信息

package org.example1.test;

import org.example1.mapper.EmployeeMapper;
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.example1.pojo.Employee;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;

public class MyBatisTest {
    @Test
    public void insertEmployeeTest() throws IOException {
        //加载核心配置文件
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        //获取SqlSessionFactoryBuilder
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //获取SqlSessionFactory
        SqlSessionFactory sqlSessionFactory = sqlSessionFactoryBuilder.build(is);
        //获取SqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        //获取mapper接口对象
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //测试功能
        //int result = mapper.insertEmployee();
        //提交事务
        //sqlSession.commit();
        //System.out.println("result:"+result);
    }

    @Test
    public void deleteEmployeeTest() throws IOException {
        InputStream is = Resources.getResourceAsStream("mybatis-config.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession(true);
        EmployeeMapper mapper = sqlSession.getMapper(EmployeeMapper.class);
        //mapper.updateEmployee();
        mapper.deleteEmployee();
        //Employee employee = mapper.findById();
        //System.out.println(employee);
    }
}

9.数据库运行截图

（1）根据id查询员工信息

（2）新增员工信息

（3）根据id更新员工信息

（4）根据id删除员工信息

标签： java javaee intellij-idea

本文转载自: https://blog.csdn.net/WHT869706733/article/details/123389400
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JAVA EE——案例：员工管理系统

1.题目

2.文件目录

3. 引入依赖——pom.xml

4.配置文件——myBatis-config.xml

5.映射文件——EmployeeMapper.xml

6.java类——Employee.java

7.接口类——EmployeeMapper.java

8.测试类——MyBatisTest.java

（1）根据id查询员工信息

（2）新增员工信息

（3）根据id更新员工信息

（4）根据id删除员工信息

9.数据库运行截图

（1）根据id查询员工信息

（2）新增员工信息

（3）根据id更新员工信息

（4）根据id删除员工信息

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