Spring、SpringBoot整合Mybatis-Plus详细教程

Spring整合MP

1.1 创建项目

1.2 引入依赖

<properties>
  <maven.compiler.source>8</maven.compiler.source>
  <maven.compiler.target>8</maven.compiler.target>
  <spring.version>5.1.6.RELEASE</spring.version>
</properties>

<dependencies>
  <dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</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-test</artifactId>
    <version>${spring.version}</version>
  </dependency>
  <!-- mybatis-plus插件依赖 -->
  <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.4.0</version>
  </dependency>
  <!--Mysql-->
  <dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.47</version>
  </dependency>
  <!--连接池-->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.11</version>
  </dependency>
  <!--简化bean代码的工具包-->
  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <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>
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1.3 编写jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/mp?serverTimezone=GMT%2B8&useSSL=false
jdbc.username=root
jdbc.password=root
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1.4 编写mybatis配置文件sqlMapConfig.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>

  <plugins>
    <plugin interceptor="com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor">
    </plugin>
  </plugins>


</configuration>
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1.5 编写Spring配置文件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">

  <!-- 引入properties文件-->
  <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder>

  <!--数据源-->
  <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="${jdbc.driver}"/>
    <property name="url" value="${jdbc.url}"/>
    <property name="username" value="${jdbc.username}"/>
    <property name="password" value="${jdbc.password}"/>
  </bean>

  <!--1. 将sqlSessionFactory对象的创建交给spring-->
  <!--这⾥使⽤MP提供的sqlSessionFactory,完成spring与mp的整合-->
  <bean id="sqlSessionFactory" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:sqlMapConfig.xml"/>
  </bean>


  <!--2. mapper映射扫描-->
  <!--扫描mapper接⼝，使⽤的依然是mybatis原⽣的扫描器-->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.mybatis.mapper"/>
  </bean>
</beans>
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1.6 编写User对象以及UserMapper接⼝

@Data // getter setter toString
@NoArgsConstructor //生成无参构造
@AllArgsConstructor // 生成全参构造
@TableName("user")
public class User {

  private Long id;
  private String name;
  private Integer age;
  private String email;
  
}
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public interface UserMapper extends BaseMapper<User> {

  List<User> findAll();
}
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1.7 编写测试用例

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = "classpath:applicationContext.xml")
public class TestSpringMP {

  @Autowired
  private UserMapper userMapper;

  @Test
  public void test(){

    List<User> users = userMapper.selectList(null);
    for (User user : users) {
      System.out.println(user);
    }
  }
}
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至此Spring整合Mybatis-Plus基本流程就完成。

SpringBoot整合MP

2.1 创建SpringBoot项目

2.2 导入依赖

<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>
  <!--    简化代码的⼯具包 -->
  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
  </dependency>
  <!--mybatis-plus 的 springboot ⽀持 -->
  <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.1.1</version>
  </dependency>
  <!--mysql 驱动 -->
  <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>
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2.3 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
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2.4 编写application.properties

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
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2.5 编写User对象以及UserMapper接⼝

@Data // getter setter toString
@NoArgsConstructor //生成无参构造
@AllArgsConstructor // 生成全参构造
@TableName("tb_user")
public class User {
  
}
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public interface UserMapper extends BaseMapper<User>{
}
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2.6 编写启动类

@MapperScan("com.mybatis.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);
  }
}
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2.7 编写测试用例

@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);
    }
  }
}
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2.8 结果

至此SpringBoot整合MybatisPlus教程已经结束