mybatis-plus教程-SpringBoot整合Mybatis-plus

旧城等待， 2023-06-13 08:54 142阅读 0赞

## 完整代码 ##

[https://github.com/pbteach/mybatis-plus-test][https_github.com_pbteach_mybatis-plus-test]

## SpringBoot整合Mybatis-plus ##

对于Mybatis整合MP有常常有三种用法，分别是Mybatis+MP、Spring+Mybatis+MP、Spring Boot+Mybatis+MP。

### 创建数据库以及表 ###

![1556246014663][]

-- 创建测试表
    CREATE TABLE `tb_user` (
      `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键ID',
      `user_name` varchar(20) NOT NULL COMMENT '用户名',
      `password` varchar(20) NOT NULL COMMENT '密码',
      `name` varchar(30) DEFAULT NULL COMMENT '姓名',
      `age` int(11) DEFAULT NULL COMMENT '年龄',
      `email` varchar(50) DEFAULT NULL COMMENT '邮箱',
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
    
    -- 插入测试数据
    INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES ('1', 'zhangsan', '123456', '张三', '18', 'test1@pbteach.com');
    INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES ('2', 'lisi', '123456', '李四', '20', 'test2@pbteach.com');
    INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES ('3', 'wangwu', '123456', '王五', '28', 'test3@pbteach.com');
    INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES ('4', 'zhaoliu', '123456', '赵六', '21', 'test4@pbteach.com');
    INSERT INTO `tb_user` (`id`, `user_name`, `password`, `name`, `age`, `email`) VALUES ('5', 'sunqi', '123456', '孙七', '24', 'test5@pbteach.com');

### 创建工程 ###

![1573689960907][]

导入依赖：

<?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.pbteach.mp</groupId>
        <artifactId>pbteach-mybatis-plus</artifactId>
        <version>1.0-SNAPSHOT</version>
        <modules>
            <module>pbteach-mybatis-plus-simple</module>
        </modules>
        <packaging>pom</packaging>
    
        <dependencies>
            
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus</artifactId>
                <version>3.1.1</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.11</version>
            </dependency>
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
                <version>1.18.4</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.12</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>1.6.4</version>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.8</source>
                        <target>1.8</target>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
    </project>

### Mybatis + MP ###

下面演示，通过纯Mybatis与Mybatis-Plus整合。

#### 创建子Module ####

log4j.properties：

log4j.rootLogger=DEBUG,A1
    
    log4j.appender.A1=org.apache.log4j.ConsoleAppender
    log4j.appender.A1.layout=org.apache.log4j.PatternLayout
    log4j.appender.A1.layout.ConversionPattern=[%t] [%c]-[%p] %m%n

#### Mybatis实现查询User ####

> **第一步，编写mybatis-config.xml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">
    <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://127.0.0.1:3306/mp?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false"/>
                    <property name="username" value="root"/>
                    <property name="password" value="root"/>
                </dataSource>
            </environment>
        </environments>
        <mappers>
            <mapper resource="UserMapper.xml"/>
        </mappers>
    </configuration>

> **第二步，编写User实体对象：（这里使用lombok进行了进化bean操作）**

package com.pbteach.mp.simple.pojo;
    
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class User { 
    
        private Long id;
        private String userName;
        private String password;
        private String name;
        private Integer age;
        private String email;
    }

> **第三步，编写UserMapper接口：**

package com.pbteach.mp.simple.mapper;
    
    import com.pbteach.mp.simple.pojo.User;
    
    import java.util.List;
    
    public interface UserMapper { 
    
        List<User> findAll();
    
    }

> **第四步，编写UserMapper.xml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.pbteach.mp.simple.mapper.UserMapper">
    
        <select id="findAll" resultType="com.pbteach.mp.simple.pojo.User">
          select * from tb_user
        </select>
    
    </mapper>

> **第五步，编写TestMybatis测试用例：**

package com.pbteach.mp.simple;
    
    import com.pbteach.mp.simple.mapper.UserMapper;
    import com.pbteach.mp.simple.pojo.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.Test;
    
    import java.io.InputStream;
    import java.util.List;
    
    public class TestMybatis { 
    
        @Test
        public void testUserList() throws Exception{ 
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
            SqlSession sqlSession = sqlSessionFactory.openSession();
    
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
            List<User> list = userMapper.findAll();
            for (User user : list) { 
                System.out.println(user);
            }
    
        }
    
    }

测试结果：

[main] [com.pbteach.mp.simple.mapper.UserMapper.findAll]-[DEBUG] ==> Parameters: 
    [main] [com.pbteach.mp.simple.mapper.UserMapper.findAll]-[DEBUG] <==      Total: 5
    User(id=1, userName=null, password=123456, name=张三, age=18, email=test1@pbteach.com)
    User(id=2, userName=null, password=123456, name=李四, age=20, email=test2@pbteach.com)
    User(id=3, userName=null, password=123456, name=王五, age=28, email=test3@pbteach.com)
    User(id=4, userName=null, password=123456, name=赵六, age=21, email=test4@pbteach.com)
    User(id=5, userName=null, password=123456, name=孙七, age=24, email=test5@pbteach.com)

#### Mybatis+MP实现查询User ####

> **第一步，将UserMapper继承BaseMapper，将拥有了BaseMapper中的所有方法：**

package com.pbteach.mp.simple.mapper;
    
    import com.pbteach.mp.simple.pojo.User;
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    
    import java.util.List;
    
    public interface UserMapper extends BaseMapper<User> { 
    
        List<User> findAll();
    
    }

第二步，使用MP中的MybatisSqlSessionFactoryBuilder进程构建：

package com.pbteach.mp.simple;
    
    import com.pbteach.mp.simple.mapper.UserMapper;
    import com.pbteach.mp.simple.pojo.User;
    import com.baomidou.mybatisplus.core.MybatisSqlSessionFactoryBuilder;
    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.InputStream;
    import java.util.List;
    
    public class TestMybatisPlus { 
    
        @Test
        public void testUserList() throws Exception{ 
            String resource = "mybatis-config.xml";
            InputStream inputStream = Resources.getResourceAsStream(resource);
            //这里使用的是MP中的MybatisSqlSessionFactoryBuilder
            SqlSessionFactory sqlSessionFactory = new MybatisSqlSessionFactoryBuilder().build(inputStream);
            SqlSession sqlSession = sqlSessionFactory.openSession();
    
            UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
    
            // 可以调用BaseMapper中定义的方法
            List<User> list = userMapper.selectList(null);
            for (User user : list) { 
                System.out.println(user);
            }
    
        }
    
    }

运行报错：

![1556292057761][]

解决：在User对象中添加@TableName，指定数据库表名

![1556292080561][]

测试：

[main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] ==>  Preparing: SELECT id,user_name,password,name,age,email FROM tb_user 
    [main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] ==> Parameters: 
    [main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] <==      Total: 5
    User(id=1, userName=zhangsan, password=123456, name=张三, age=18, email=test1@pbteach.com)
    User(id=2, userName=lisi, password=123456, name=李四, age=20, email=test2@pbteach.com)
    User(id=3, userName=wangwu, password=123456, name=王五, age=28, email=test3@pbteach.com)
    User(id=4, userName=zhaoliu, password=123456, name=赵六, age=21, email=test4@pbteach.com)
    User(id=5, userName=sunqi, password=123456, name=孙七, age=24, email=test5@pbteach.com)

说明：由于使用了MybatisSqlSessionFactoryBuilder进行了构建，继承的BaseMapper中的方法就载入到了SqlSession中，所以就可以直接使用相关的方法；

### Spring + Mybatis + MP ###

引入了Spring框架，数据源、构建等工作就交给了Spring管理。

#### 创建子Module ####

#### 实现查询User ####

第一步，编写jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/mp?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false
    jdbc.username=root
    jdbc.password=root

第二步，编写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 http://www.springframework.org/schema/context/spring-context.xsd">
    
        <context:property-placeholder location="classpath:*.properties"/>
    
        
        <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
            <property name="url" value="${jdbc.url}"/>
            <property name="username" value="${jdbc.username}"/>
            <property name="password" value="${jdbc.password}"/>
            <property name="driverClassName" value="${jdbc.driver}"/>
            <property name="maxActive" value="10"/>
            <property name="minIdle" value="5"/>
        </bean>
    
        
        <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
        </bean>
    
        
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="com.pbteach.mp.simple.mapper"/>
        </bean>
    
    </beans>

第三步，编写User对象以及UserMapper接口：

package com.pbteach.mp.simple.pojo;
    
    import com.baomidou.mybatisplus.annotation.TableName;
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    @TableName("tb_user")
    public class User { 
    
        private Long id;
        private String userName;
        private String password;
        private String name;
        private Integer age;
        private String email;
    }

package com.pbteach.mp.simple.mapper;
    
    import com.pbteach.mp.simple.pojo.User;
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    
    public interface UserMapper extends BaseMapper<User> { 
    
    }

第四步，编写测试用例：

package com.pbteach.mp.simple;
    
    import com.pbteach.mp.simple.mapper.UserMapper;
    import com.pbteach.mp.simple.pojo.User;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.test.context.ContextConfiguration;
    import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
    
    import java.util.List;
    
    @RunWith(SpringJUnit4ClassRunner.class)
    @ContextConfiguration(locations = "classpath:applicationContext.xml")
    public class TestSpringMP { 
    
        @Autowired
        private UserMapper userMapper;
    
        @Test
        public void testSelectList(){ 
            List<User> users = this.userMapper.selectList(null);
            for (User user : users) { 
                System.out.println(user);
            }
        }
    
    }

测试：

[main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] ==>  Preparing: SELECT id,user_name,password,name,age,email FROM tb_user 
    [main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] ==> Parameters: 
    [main] [com.pbteach.mp.simple.mapper.UserMapper.selectList]-[DEBUG] <==      Total: 5
    [main] [org.mybatis.spring.SqlSessionUtils]-[DEBUG] Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@74287ea3]
    User(id=1, userName=zhangsan, password=123456, name=张三, age=18, email=test1@pbteach.com)
    User(id=2, userName=lisi, password=123456, name=李四, age=20, email=test2@pbteach.com)
    User(id=3, userName=wangwu, password=123456, name=王五, age=28, email=test3@pbteach.com)
    User(id=4, userName=zhaoliu, password=123456, name=赵六, age=21, email=test4@pbteach.com)
    User(id=5, userName=sunqi, password=123456, name=孙七, age=24, email=test5@pbteach.com)

### SpringBoot + Mybatis + MP ###

使用SpringBoot将进一步的简化MP的整合，需要注意的是，由于使用SpringBoot需要继承parent，所以需要重新创建工程，并不是创建子Module。

#### 创建工程 ####

![1573690098101][]

#### 导入依赖 ####

<?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>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.4.RELEASE</version>
        </parent>
    
        <groupId>com.pbteach.mp</groupId>
        <artifactId>pbteach-mp-springboot</artifactId>
        <version>1.0-SNAPSHOT</version>
    
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
                <exclusions>
                    <exclusion>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-starter-logging</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
            
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            
            <dependency>
                <groupId>com.baomidou</groupId>
                <artifactId>mybatis-plus-boot-starter</artifactId>
                <version>3.1.1</version>
            </dependency>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>5.1.47</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

log4j.properties：

#### 编写application.properties ####

spring.application.name = pbteach-mp-springboot
    
    spring.datasource.driver-class-name=com.mysql.jdbc.Driver
    spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mp?useUnicode=true&characterEncoding=utf8&autoReconnect=true&allowMultiQueries=true&useSSL=false
    spring.datasource.username=root
    spring.datasource.password=root

#### 编写pojo ####

package com.pbteach.mp.pojo;
    
    import com.baomidou.mybatisplus.annotation.TableName;
    import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    @TableName("tb_user")
    public class User { 
    
        private Long id;
        private String userName;
        private String password;
        private String name;
        private Integer age;
        private String email;
    }

#### 编写mapper ####

package com.pbteach.mp.mapper;
    
    import com.pbteach.mp.pojo.User;
    import com.baomidou.mybatisplus.core.mapper.BaseMapper;
    
    public interface UserMapper extends BaseMapper<User> { 
    }

#### 编写启动类 ####

package com.pbteach.mp;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.WebApplicationType;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    
    @MapperScan("com.pbteach.mp.mapper") //设置mapper接口的扫描包
    @SpringBootApplication
    public class MyApplication { 
    
        public static void main(String[] args) { 
            SpringApplication.run(MyApplication.class, args);
        }
    
    }

#### 编写测试用例 ####

package com.pbteach.mp;
    
    import com.pbteach.mp.mapper.UserMapper;
    import com.pbteach.mp.pojo.User;
    import org.junit.Test;
    import org.junit.runner.RunWith;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.test.context.SpringBootTest;
    import org.springframework.test.context.junit4.SpringRunner;
    
    import java.util.List;
    
    @RunWith(SpringRunner.class)
    @SpringBootTest
    public class UserMapperTest { 
    
        @Autowired
        private UserMapper userMapper;
    
        @Test
        public void testSelect() { 
            List<User> userList = userMapper.selectList(null);
            for (User user : userList) { 
                System.out.println(user);
            }
        }
    
    }

测试：

[main] [com.pbteach.mp.mapper.UserMapper.selectList]-[DEBUG] ==>  Preparing: SELECT id,user_name,password,name,age,email FROM tb_user 
    [main] [com.pbteach.mp.mapper.UserMapper.selectList]-[DEBUG] ==> Parameters: 
    [main] [com.pbteach.mp.mapper.UserMapper.selectList]-[DEBUG] <==      Total: 5
    [main] [org.mybatis.spring.SqlSessionUtils]-[DEBUG] Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@14faa38c]
    User(id=1, userName=zhangsan, password=123456, name=张三, age=18, email=test1@pbteach.com)
    User(id=2, userName=lisi, password=123456, name=李四, age=20, email=test2@pbteach.com)
    User(id=3, userName=wangwu, password=123456, name=王五, age=28, email=test3@pbteach.com)
    User(id=4, userName=zhaoliu, password=123456, name=赵六, age=21, email=test4@pbteach.com)
    User(id=5, userName=sunqi, password=123456, name=孙七, age=24, email=test5@pbteach.com)

###  ###

ser  
\[main\] \[com.pbteach.mp.mapper.UserMapper.selectList\]-\[DEBUG\] > Parameters:  
\[main\] \[com.pbteach.mp.mapper.UserMapper.selectList\]-\[DEBUG\] < Total: 5  
\[main\] \[org.mybatis.spring.SqlSessionUtils\]-\[DEBUG\] Closing non transactional SqlSession \[org.apache.ibatis.session.defaults.DefaultSqlSession@14faa38c\]  
User(id=1, userName=zhangsan, password=123456, name=张三, age=18, email=test1@pbteach.com)  
User(id=2, userName=lisi, password=123456, name=李四, age=20, email=test2@pbteach.com)  
User(id=3, userName=wangwu, password=123456, name=王五, age=28, email=test3@pbteach.com)  
User(id=4, userName=zhaoliu, password=123456, name=赵六, age=21, email=test4@pbteach.com)  
User(id=5, userName=sunqi, password=123456, name=孙七, age=24, email=test5@pbteach.com)

[https_github.com_pbteach_mybatis-plus-test]: https://github.com/pbteach/mybatis-plus-test
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