利用mybatis框架实现数据库表的CRUD

迷南。 2021-09-29 08:50 299阅读 0赞

# 利用mybatis框架实现数据库表的CRUD #

本文是基于Windows 10系统环境，利用mybatis框架实现数据库表的CRUD

*  **Windows 10**
 *  **IntelliJ**

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## 一、构建过程（简单入门） ##

### (1) 打开IntelliJ，创建一个新项目 ###

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### (2) 选择“maven”工程，然后点击“next” ###

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### (3) 填写公司ID等信息，然后点击“next” ###

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### (4) 填写项目名称等信息，然后点击“finish” ###

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### (5) 点击“pom.xml”文件，然后填写各种依赖的坐标 ###

<?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.inspur</groupId>
        <artifactId>day02_eesy_01mybatisCRUD</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>jar</packaging>
        <dependencies>
            <dependency>
                <groupId>org.mybatis</groupId>
                <artifactId>mybatis</artifactId>
                <version>3.4.5</version>
            </dependency>
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.6</version>
            </dependency>
            <dependency>
                <groupId>log4j</groupId>
                <artifactId>log4j</artifactId>
                <version>1.2.12</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.10</version>
            </dependency>
        </dependencies>
    </project>

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### (6) 创建一个User类，然后生成相应的属性和方法 ###

![在这里插入图片描述][20190701214912376.png]  
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package com.inspur.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 + '\'' +
                    '}';
        }
    }

### (7) 创建一个QueryVo类，然后生成相应的属性和方法 ###

package com.inspur.domain;
    
    public class QueryVo { 
        private User user;
    
        public User getUser() { 
            return user;
        }
    
        public void setUser(User user) { 
            this.user = user;
        }
    }

### (8) 创建一个User类的持久层接口类 ###

package com.inspur.dao;
    
    import com.inspur.domain.User;
    import com.inspur.domain.QueryVo;
    
    import java.util.List;
    
    public interface IUserDao { 
        /** * 查询所有用户 * @return */
        public List<User> findAll();
    
        /** * 保存用户 * @param user */
        public void saveUser(User user);
    
        /** * 更新用户 * @param user */
        public void updateUser(User user);
    
        /** * 删除用户 * @param id */
        public void deleteUser(Integer id);
    
        /** * 通过id查询用户 * @param id * @return */
        public User findById(Integer id);
    
        /** * 通过name模糊查询用户 * @param username * @return */
        public List<User> findByName(String username);
    
        /** * 查询总个数 * @return */
        public Integer findTotal();
    
        /** * * @param qv * @return */
        public List<User> findByQuery(QueryVo qv);
    }

### (9) 创建一个主配置文件SqlMapConfig.xml配置文件 ###

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<?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="mysql">
            
            <environment id="mysql">
                
                <transactionManager type="JDBC"></transactionManager>
                
                <dataSource type="POOLED">
                    
                    <property name="driver" value="com.mysql.jdbc.Driver"/>
                    <property name="url" value="jdbc:mysql://172.30.12.59:3306/eesy_mybatis"/>
                    <property name="username" value="root"/>
                    <property name="password" value="123456"/>
                </dataSource>
            </environment>
        </environments>
        
        <mappers>
            <mapper resource="com/inspur/dao/IUserDao.xml"/>
        </mappers>
    </configuration>

### (10) 创建一个指定类IUserDao的配置文件IUserDao.xml ###

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<?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="com.inspur.dao.IUserDao">
        
        <select id="findAll" resultType="com.inspur.domain.User">
            select * from user
        </select>
        
        <insert id="saveUser" parameterType="com.inspur.domain.User">
            
            <selectKey keyProperty="id" keyColumn="id" resultType="java.lang.Integer" order="AFTER">
                select last_insert_id()
            </selectKey>
            insert into user(username, address, sex, birthday) values(#{username}, #{address}, #{sex}, #{birthday})
        </insert>
        
        <update id="updateUser" parameterType="com.inspur.domain.User">
            update user set username=#{username},address=#{address},sex=#{sex},birthday=#{birthday} where id=#{id}
        </update>
        
        <delete id="deleteUser" parameterType="java.lang.Integer">
            delete from user where id=#{id}
        </delete>
        
        <select id="findById" parameterType="java.lang.Integer" resultType="com.inspur.domain.User">
            select * from user where id=#{id}
        </select>
        
        <select id="findByName" parameterType="java.lang.String" resultType="com.inspur.domain.User">
            select * from user where username like #{name}
        </select>
        
        <select id="findTotal" resultType="java.lang.Integer">
            select count(*) from user
        </select>
        
        <select id="findByQuery" parameterType="com.inspur.domain.QueryVo" resultType="com.inspur.domain.User">
            select * from user where username like #{user.username}
        </select>
    </mapper>

### (11) 写一个测试类，测试CRUD结果 ###

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package com.inspur.test;
    import java.io.InputStream;
    import java.util.Date;
    import java.util.List;
    import com.inspur.dao.IUserDao;
    import com.inspur.domain.User;
    import com.inspur.domain.QueryVo;
    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;
    
    public class MybatisTest { 
        private InputStream in;
        private SqlSession sqlSession;
        private IUserDao userDao;
    
        @Before
        public void init() throws Exception{ 
            //1.读取配置文件
            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 = factory.openSession();
            //4.使用SqlSession对象创建Dao接口的代理对象
            userDao = sqlSession.getMapper(IUserDao.class);
        }
    
        @After
        public void destroy() throws Exception{ 
            sqlSession.commit();
            if(sqlSession != null)
                sqlSession.close();
            if(in != null)
                in.close();
        }
    
        /** * 测试查询所有操作 * @throws Exception */
        @Test
        public void testFindAll() throws Exception{ 
            List<User> users = userDao.findAll();
            for (User user : users){ 
                System.out.println(user);
            }
        }
    
        /** * 测试保存操作 * @throws Exception */
        @Test
        public void testSave() throws Exception{ 
            User user = new User();
            user.setUsername("李必");
            user.setAddress("山东");
            user.setSex("男");
            user.setBirthday(new Date());
    
            //5.使用代理对象执行方法
            userDao.saveUser(user);
            System.out.println(user);
    
        }
    
        /** * 测试更新操作 * @throws Exception */
        @Test
        public void testUpdate() throws Exception{ 
            User user = new User();
            user.setId(50);
            user.setUsername("檀琪");
            user.setAddress("山东");
            user.setSex("女");
            user.setBirthday(new Date());
    
            //5.使用代理对象执行方法
            userDao.updateUser(user);
        }
    
        /** * 测试删除操作 */
        @Test
        public void testDelete(){ 
            userDao.deleteUser(50);
        }
    
        /** * 测试通过id查询操作 */
        @Test
        public void testFindById(){ 
            User user = userDao.findById(48);
            System.out.println(user);
        }
    
        /** * 测试通过name模糊查询操作 */
        @Test
        public void testFindByName() throws Exception{ 
            String name = "老%";
            List<User> users = userDao.findByName(name);
            for (User user : users){ 
                System.out.println(user);
            }
        }
    
        /** * 测试查询总数操作 */
        @Test
        public void testFindTotal(){ 
            Integer count = userDao.findTotal();
            System.out.println(count);
        }
    
        /** * */
        @Test
        public void testFindByQuery(){ 
            User user = new User();
            user.setUsername("%李%");
    
            QueryVo qv = new QueryVo();
            qv.setUser(user);
    
            List<User> users = userDao.findByQuery(qv);
            for (User u : users){ 
                System.out.println(u);
            }
    
        }
    }

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