Spring与MyBatis框架集成

标签：集成 cn Spring qrj User MyBatis import com id

引言

尽管Spring本身提供了Spring JDBC作为对JDBC的抽象和简化，但与MyBatis集成可以提供更多的功能和灵活性。MyBatis是一款优秀的持久层框架，它通过XML或注解的方式将SQL语句与Java方法进行绑定，提供了更直观和便捷的方式来管理数据库操作。集成Spring和MyBatis可以发挥两者的优势，Spring提供了事务管理、依赖注入等功能，而MyBatis负责处理数据库操作。这种集成可以简化开发过程，提高开发效率，并且允许更好地管理和优化SQL语句。

Spring不排斥各种优秀的框架，并提供对各种优秀框架的支持。

创建数据库表

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `age` int(11) NULL DEFAULT NULL,
  `gender` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

在IDEA中新建Maven项目

选择New Project创建新的项目

选择Maven ---> 选择自己的SDK版本 ---> Next

填写项目的基本信息 ---> Finish

File ---> Settings ---> Build,Execution,Deployment ---> Build Tools ---> Maven

配置自己的Maven环境

修改pom.xml配置，添加Maven依赖

<?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.cn.qrj</groupId>
    <artifactId>SpringMyBatis</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <!-- Spring版本 -->
        <spring.version>5.2.3.RELEASE</spring.version>
    </properties>

    <dependencies>
        <!-- Spring依赖 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>


        <!-- MyBatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.5</version>
        </dependency>

        <!-- 数据库驱动依赖（根据你使用的数据库选择） -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

        <!-- lombok 依赖-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.18</version>
        </dependency>

        <!-- 日志整合 slf4j门面设计模式与 log4j或log4j2一起使用-->
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.36</version>
        </dependency>
        <!-- 日志-->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>RELEASE</version>
            <scope>compile</scope>
        </dependency>
    </dependencies>

</project>

创建User实体类

在main/java目录下创建com.cn.qrj.entity包，在包下面创建User实体类

package com.cn.qrj.entity;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @author: qrj
 * @description 用户实体类
 * @Date: 2023/9/12 17:12
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
    private Integer id;
    private String name;
    private Integer age;
    private String gender;
}

创建UserMapper接口

在main/java目录下创建com.cn.qrj.mapper包，在包下面创建UserMapper接口，并定义如下一些方法。

package com.cn.qrj.mapper;

import com.cn.qrj.entity.User;

import java.util.List;

/**
 * @author: qrj
 * @description
 * @Date: 2023/9/12 17:17
 */
public interface UserMapper {
    //查询所有的用户
    List<User> findAllUser();
    //查询单个用户
    User findUserById(Integer id);
    //添加用户
    int insertUser(User user);
    //删除用户
    int deleteUser(Integer id);
    //修改用户
    int update(User user);
}

创建UserMapper.xml映射文件

注意这里创建的UserMapper映射文件要和之前创建的UserMapper接口文件相对应。

在resources文件夹下创建mapper文件夹，并在mapper文件夹下创建UserMapper.xml映射文件。

<?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.cn.qrj.mapper.UserMapper">
    <select id="findAllUser" resultType="com.cn.qrj.entity.User">
        SELECT
            *
        FROM
            USER;
    </select>

    <select id="findUserById" resultType="com.cn.qrj.entity.User">
        SELECT
            *
        FROM
            USER
        WHERE
            id = #{id}
    </select>

    <insert id="insertUser" parameterType="com.cn.qrj.entity.User">
        INSERT INTO USER ( name, age, gender )
            VALUE
            ( #{name}, #{age} , #{gender} )
    </insert>

    <delete id="deleteUser">
        DELETE
        FROM
            USER
        WHERE
            id = #[id]
    </delete>

    <update id="updateUser" parameterType="com.cn.qrj.entity.User">
        UPDATE USER
        SET name = #{name},
            age = #{age},
            gender = #{gender}
        WHERE
            id = #{id}
    </update>
</mapper>

创建IUserService接口和UserServiceImpl实现类

在main/java目录下创建com.cn.qrj.service包，在包中创建IUserService接口

package com.cn.qrj.service;

import com.cn.qrj.entity.User;

import java.util.List;

/**
 * @author: qrj
 * @description
 * @Date: 2023/9/12 17:41
 */
public interface IUserService {
    //查询所有的用户
    List<User> findAllUser();
    //查询单个用户
    User findUserById(Integer id);
    //添加用户
    int insertUser(User user);
    //删除用户
    int deleteUser(Integer id);
    //修改用户
    int updateUser(User user);
}

在com.cn.qrj.service包下创建Impl包，并创建UserServiceImpl实现类

package com.cn.qrj.service.Impl;

import com.cn.qrj.entity.User;
import com.cn.qrj.mapper.UserMapper;
import com.cn.qrj.service.IUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @author: qrj
 * @description
 * @Date: 2023/9/12 17:45
 */
@Service //控制反转
public class UserServiceImpl implements IUserService {

    @Autowired //依赖注入
    private UserMapper userMapper;

    @Override
    public List<User> findAllUser() {
        return userMapper.findAllUser();
    }

    @Override
    public User findUserById(Integer id) {
        return userMapper.findUserById(id);
    }

    @Override
    public int insertUser(User user) {
        int result = userMapper.insertUser(user);
        return result;
    }

    @Override
    public int deleteUser(Integer id) {
        int result = userMapper.deleteUser(id);
        return result;
    }

    @Override
    public int updateUser(User user) {
        int result = userMapper.updateUser(user);
        return result;
    }
}

创建数据库配置文件db.properties

在resources文件夹下创建db.properties文件

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/spring_mybatis?useSSL=false
db.username=root
db.password=123456

注意：以上信息要根据自己的数据库配置

创建日志配置文件log4j.properties

在resources文件夹下创建log4j.properties文件

log4j.rootLogger=DEBUG, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

创建Spring IOC 容器spring-config.xml文件

在resources文件夹下创建spring-config.xml文件

<?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"
       xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://mybatis.org/schema/mybatis-spring
           http://mybatis.org/schema/mybatis-spring.xsd">

    <!-- 自动扫描注解 -->
    <context:component-scan base-package="com.cn.qrj"/>

    <!-- 引入数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 配置数据源 -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="${db.driver}"/>
        <property name="url" value="${db.url}"/>
        <property name="username" value="${db.username}"/>
        <property name="password" value="${db.password}"/>
    </bean>

    <!-- MyBatis 扫描 mapper -->
    <mybatis:scan base-package="com.cn.qrj.mapper"/>

    <!-- 配置SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!--设置entity实体类路径-->
        <property name="typeAliasesPackage" value="com.cn.qrj.entity" />
        <!--设置mapper映射文件路径-->
        <property name="mapperLocations" value="classpath*:mapper/*.xml" />
    </bean>
</beans>

创建测试类SpringMyBatisTest测试类

import com.cn.qrj.entity.User;
import com.cn.qrj.service.IUserService;
import com.cn.qrj.service.Impl.UserServiceImpl;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

/**
 * @author: qrj
 * @description
 * @Date: 2023/9/12 18:03
 */
public class SpringMyBatisTest {
    public static void main(String[] args) {
        //加载IOC容器
        ClassPathXmlApplicationContext ioc = new ClassPathXmlApplicationContext("spring-config.xml");
        System.out.println(ioc);

        IUserService userService = ioc.getBean(UserServiceImpl.class);
        List<User> userList = userService.findAllUser();
        for (User user : userList){
            System.out.println(user);
        }

        User user = new User(null,"黎明",25,"男");
        if (userService.insertUser(user) > 0){
            System.out.println("添加成功");
        }else {
            System.out.println("添加失败");
        }
    }
}

运行测试类，得到如下结果：

查询结果和插入结果都已成功实现，框架集成成功！

标签：集成,cn,Spring,qrj,User,MyBatis,import,com,id
From： https://www.cnblogs.com/one-xiaoqiang/p/17738613.html

引言