Before the order

MybatisPlus general CRUD interface MybatisPlus conditional constructor MybatisPlus code generator tutorial details The configuration of MybatisPlus

1. Spring integration with MP

1.1 Creating a Project

1.2 Importing Dependencies

<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 plugin dependencies -->
  <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>
  <! -- Connection pool -->
  <dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.11</version>
  </dependency>
  <! A toolkit for simplifying bean code
  <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 write 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 Compiling mybatis configuration file sqlmapconfig.xml

      
<! DOCTYPEconfiguration
  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 Writing the Spring configuration file applicationContext.xml

      
<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>

  <! -- Data source -->
  <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>

  <! Create sqlSessionFactory ();
  <! SqlSessionFactory = sqlSessionFactory = sqlSessionFactory = sqlSessionFactory = sqlSessionFactory
  <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 mapping -->
  <! -- Scan mapper interface, using mybatis native scanner -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.mybatis.mapper"/>
  </bean>
</beans>
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1.6 Writing the User object and UserMapper interface

@Data // getter setter toString
@NoArgsConstructor // Generate a no-parameter construct
@AllArgsConstructor // Generate a full-parameter construct
@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(a);
}
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1.7 Writing Test Cases

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

  @Autowired
  private UserMapper userMapper;

  @Test
  public void test(a){

    List<User> users = userMapper.selectList(null);
    for(User user : users) { System.out.println(user); }}}Copy the code

At this point, Spring integration of Mybatis-Plus basic process is completed.

2. SpringBoot integrates MP

2.1 Creating a SpringBoot Project

2.2 Importing Dependencies

<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>
  <! -- Simplify code toolkit -->
  <dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <optional>true</optional>
  </dependency>
  <! -- Springboot support for Mybatis -->
  <dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.1.1</version>
  </dependency>
  <! - mysql driver - >
  <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 the 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 written application. The 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 Write the User object and UserMapper interface

@Data // getter setter toString
@NoArgsConstructor // Generate a no-parameter construct
@AllArgsConstructor // Generate a full-parameter construct
@TableName("tb_user")
public class User {}Copy the code

public interface UserMapper extends BaseMapper<User>{}Copy the code

2.6 Writing startup classes

@MapperScan("com.mybatis.mp.mapper") // Set scan packets for the mapper interface
@SpringBootApplication
public class MyApplication {
  public static void main(String[] args) { SpringApplication.run(MyApplication.class, args); }}Copy the code

2.7 Writing test cases

@RunWith(SpringRunner.class)
@SpringBootTest
public class UserMapperTest {
  @Autowired
  private UserMapper userMapper;
  
  @Test
  public void testSelect(a) {
    List<User> userList = userMapper.selectList(null);
    for(User user : userList) { System.out.println(user); }}}Copy the code

2.8 the results

This concludes the SpringBoot MybatisPlus tutorial