MP教程-入门

搭建项目

一、数据库

CREATE TABLE `tb_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4;

 

二、创建SpringBoot项目

2.1 Maven

<?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 https://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>2.2.5.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.will.learn</groupId>
<artifactId>SpringBootMybatisPlus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBootMybatisPlus</name>
<description>Demo project for Spring Boot</description>
​
<properties>
<java.version>1.8</java.version>
</properties>
​
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1.tmp</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
​
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
​
</project>

 

2.2 配置

• application.properties

spring.application.name=mybatisplustest
spring.datasource.url=jdbc:mysql://192.168.0.108:3306/testdb?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=root
​
logging.config=classpath:logback.xml

• logback.xml

<configuration>      
    <!-- %m输出的信息,%p日志级别,%t线程名,%d日期,%c类的全名,%i索引【从数字0开始递增】,,, -->      
    <!-- appender是configuration的子节点，是负责写日志的组件。 -->  
    <!-- ConsoleAppender：把日志输出到控制台 -->  
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">      
        <encoder>      
            <pattern>%d %p (%file:%line)- %m%n</pattern>    
            <!-- 控制台也要使用UTF-8，不要使用GBK，否则会中文乱码 -->  
            <charset>UTF-8</charset>     
        </encoder>      
    </appender>      
    <!-- RollingFileAppender：滚动记录文件，先将日志记录到指定文件，当符合某个条件时，将日志记录到其他文件 -->  
    <!-- 以下的大概意思是：1.先按日期存日志，日期变了，将前一天的日志文件名重命名为XXX%日期%索引，新的日志仍然是sys.log -->  
    <!--             2.如果日期没有发生变化，但是当前日志的文件大小超过1KB时，对当前日志进行分割 重命名-->  
    <appender name="syslog"      
        class="ch.qos.logback.core.rolling.RollingFileAppender">      
        <File>log/sys.log</File>      
        <!-- rollingPolicy:当发生滚动时，决定 RollingFileAppender 的行为，涉及文件移动和重命名。 -->  
        <!-- TimeBasedRollingPolicy： 最常用的滚动策略，它根据时间来制定滚动策略，既负责滚动也负责出发滚动 -->  
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">      
            <!-- 活动文件的名字会根据fileNamePattern的值，每隔一段时间改变一次 -->  
            <!-- 文件名：log/sys.2017-12-05.0.log -->  
            <fileNamePattern>log/sys.%d.%i.log</fileNamePattern>   
            <!-- 每产生一个日志文件，该日志文件的保存期限为30天 -->   
            <maxHistory>30</maxHistory>     
            <timeBasedFileNamingAndTriggeringPolicy  class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">      
                <!-- maxFileSize:这是活动文件的大小，默认值是10MB,本篇设置为1KB，只是为了演示 -->    
                <maxFileSize>1KB</maxFileSize>      
            </timeBasedFileNamingAndTriggeringPolicy>      
        </rollingPolicy>      
        <encoder>      
            <!-- pattern节点，用来设置日志的输入格式 -->  
            <pattern>      
                %d %p (%file:%line)- %m%n    
            </pattern>      
            <!-- 记录日志的编码 -->  
            <charset>UTF-8</charset> <!-- 此处设置字符集 -->     
        </encoder>      
    </appender>      
    <!-- 控制台输出日志级别 -->  
    <root level="info">      
        <appender-ref ref="STDOUT" />      
    </root>      
    <!-- 指定项目中某个包，当有日志操作行为时的日志记录级别 -->  
    <!-- com.appley为根包，也就是只要是发生在这个根包下面的所有日志操作行为的权限都是DEBUG -->  
    <!-- 级别依次为【从高到低】：FATAL > ERROR > WARN > INFO > DEBUG > TRACE  -->  
    <logger name="com.will.learn.springboot" level="DEBUG">      
        <appender-ref ref="syslog" />      
    </logger>      
</configuration> 

2.3 POJO

package com.will.learn.springboot.pojo;
​
import org.springframework.beans.factory.annotation.Autowired;
​
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
​
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
​
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
//设置数据库表名
@TableName("tb_user")
@Builder
public class User {
@Autowired
  //设置主键，生成ID类型为数据库自增长
@TableId(type = IdType.AUTO)
private Integer id;
  //设置列名
@TableField("user_name")
private String name;
private String password;
private Integer age;
}

2.4 Mapper

package com.will.learn.springboot.mapper;
​
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.will.learn.springboot.pojo.User;
​
//继承BaseMapper
public interface UserMapper extends BaseMapper<User>{
​
}
​

2.5 设置Mapper扫描

package com.will.learn.springboot;
​
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
​
@SpringBootApplication
//设置mapper扫描路径
@MapperScan("com.will.learn.springboot.mapper")
public class SpringBootMybatisPlusApplication {
​
public static void main(String[] args) {
SpringApplication.run(SpringBootMybatisPlusApplication.class, args);
}
​
}
​

 

三、测试

package com.will.learn.springboot;
​
import java.util.List;
​
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
​
import com.will.learn.springboot.mapper.UserMapper;
import com.will.learn.springboot.pojo.User;
​
import lombok.val;
​
@SpringBootTest
class SpringBootMybatisPlusApplicationTests {
@Autowired
UserMapper userMapper;

@Test
void contextLoads() {
}


@Test
public void UserMapperTest() {
List<User> userList = userMapper.selectList(null);
for(val user:userList){
System.out.println(user.toString());
}
}

@Test
public void UserInsertTest() {
User user = User.builder().name("曹操").password("123fdkfjk").age(33).build();

int insert = userMapper.insert(user);
System.out.println(insert);
System.out.println(user);
}
}
​

2020-03-14 18:32:54,024 INFO (StartupInfoLogger.java:61)- Started SpringBootMybatisPlusApplicationTests in 5.053 seconds (JVM running for 7.025)
2020-03-14 18:32:54,536 INFO (HikariDataSource.java:110)- HikariPool-1 - Starting...
2020-03-14 18:32:55,814 INFO (HikariDataSource.java:123)- HikariPool-1 - Start completed.
2020-03-14 18:32:55,830 DEBUG (BaseJdbcLogger.java:143)- ==>  Preparing: INSERT INTO tb_user ( user_name, password, age ) VALUES ( ?, ?, ? ) 
2020-03-14 18:32:55,887 DEBUG (BaseJdbcLogger.java:143)- ==> Parameters: 曹操(String), 123fdkfjk(String), 33(Integer)
2020-03-14 18:32:55,906 DEBUG (BaseJdbcLogger.java:143)- <==    Updates: 1
1
User(id=3, name=曹操, password=123fdkfjk, age=33)

 

搭建项目

一、数据库

CREATE TABLE `tb_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(255) DEFAULT NULL,
  `password` varchar(255) DEFAULT NULL,
  `age` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4;

 

二、创建SpringBoot项目

2.1 Maven

<?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 https://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>2.2.5.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<groupId>com.will.learn</groupId>
<artifactId>SpringBootMybatisPlus</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>SpringBootMybatisPlus</name>
<description>Demo project for Spring Boot</description>
​
<properties>
<java.version>1.8</java.version>
</properties>
​
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1.tmp</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
​
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
​
</project>

 

2.2 配置

• application.properties

spring.application.name=mybatisplustest
spring.datasource.url=jdbc:mysql://192.168.0.108:3306/testdb?useUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=root
​
logging.config=classpath:logback.xml

• logback.xml

<configuration>      
    <!-- %m输出的信息,%p日志级别,%t线程名,%d日期,%c类的全名,%i索引【从数字0开始递增】,,, -->      
    <!-- appender是configuration的子节点，是负责写日志的组件。 -->  
    <!-- ConsoleAppender：把日志输出到控制台 -->  
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">      
        <encoder>      
            <pattern>%d %p (%file:%line)- %m%n</pattern>    
            <!-- 控制台也要使用UTF-8，不要使用GBK，否则会中文乱码 -->  
            <charset>UTF-8</charset>     
        </encoder>      
    </appender>      
    <!-- RollingFileAppender：滚动记录文件，先将日志记录到指定文件，当符合某个条件时，将日志记录到其他文件 -->  
    <!-- 以下的大概意思是：1.先按日期存日志，日期变了，将前一天的日志文件名重命名为XXX%日期%索引，新的日志仍然是sys.log -->  
    <!--             2.如果日期没有发生变化，但是当前日志的文件大小超过1KB时，对当前日志进行分割 重命名-->  
    <appender name="syslog"      
        class="ch.qos.logback.core.rolling.RollingFileAppender">      
        <File>log/sys.log</File>      
        <!-- rollingPolicy:当发生滚动时，决定 RollingFileAppender 的行为，涉及文件移动和重命名。 -->  
        <!-- TimeBasedRollingPolicy： 最常用的滚动策略，它根据时间来制定滚动策略，既负责滚动也负责出发滚动 -->  
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">      
            <!-- 活动文件的名字会根据fileNamePattern的值，每隔一段时间改变一次 -->  
            <!-- 文件名：log/sys.2017-12-05.0.log -->  
            <fileNamePattern>log/sys.%d.%i.log</fileNamePattern>   
            <!-- 每产生一个日志文件，该日志文件的保存期限为30天 -->   
            <maxHistory>30</maxHistory>     
            <timeBasedFileNamingAndTriggeringPolicy  class="ch.qos.logback.core.rolling.SizeAndTimeBasedFNATP">      
                <!-- maxFileSize:这是活动文件的大小，默认值是10MB,本篇设置为1KB，只是为了演示 -->    
                <maxFileSize>1KB</maxFileSize>      
            </timeBasedFileNamingAndTriggeringPolicy>      
        </rollingPolicy>      
        <encoder>      
            <!-- pattern节点，用来设置日志的输入格式 -->  
            <pattern>      
                %d %p (%file:%line)- %m%n    
            </pattern>      
            <!-- 记录日志的编码 -->  
            <charset>UTF-8</charset> <!-- 此处设置字符集 -->     
        </encoder>      
    </appender>      
    <!-- 控制台输出日志级别 -->  
    <root level="info">      
        <appender-ref ref="STDOUT" />      
    </root>      
    <!-- 指定项目中某个包，当有日志操作行为时的日志记录级别 -->  
    <!-- com.appley为根包，也就是只要是发生在这个根包下面的所有日志操作行为的权限都是DEBUG -->  
    <!-- 级别依次为【从高到低】：FATAL > ERROR > WARN > INFO > DEBUG > TRACE  -->  
    <logger name="com.will.learn.springboot" level="DEBUG">      
        <appender-ref ref="syslog" />      
    </logger>      
</configuration> 

2.3 POJO

package com.will.learn.springboot.pojo;
​
import org.springframework.beans.factory.annotation.Autowired;
​
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
​
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
import lombok.ToString;
​
@Data
@NoArgsConstructor
@AllArgsConstructor
@ToString
//设置数据库表名
@TableName("tb_user")
@Builder
public class User {
@Autowired
  //设置主键，生成ID类型为数据库自增长
@TableId(type = IdType.AUTO)
private Integer id;
  //设置列名
@TableField("user_name")
private String name;
private String password;
private Integer age;
}

2.4 Mapper

package com.will.learn.springboot.mapper;
​
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.will.learn.springboot.pojo.User;
​
//继承BaseMapper
public interface UserMapper extends BaseMapper<User>{
​
}
​

2.5 设置Mapper扫描

package com.will.learn.springboot;
​
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
​
@SpringBootApplication
//设置mapper扫描路径
@MapperScan("com.will.learn.springboot.mapper")
public class SpringBootMybatisPlusApplication {
​
public static void main(String[] args) {
SpringApplication.run(SpringBootMybatisPlusApplication.class, args);
}
​
}
​

 

三、测试

package com.will.learn.springboot;
​
import java.util.List;
​
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
​
import com.will.learn.springboot.mapper.UserMapper;
import com.will.learn.springboot.pojo.User;
​
import lombok.val;
​
@SpringBootTest
class SpringBootMybatisPlusApplicationTests {
@Autowired
UserMapper userMapper;

@Test
void contextLoads() {
}


@Test
public void UserMapperTest() {
List<User> userList = userMapper.selectList(null);
for(val user:userList){
System.out.println(user.toString());
}
}

@Test
public void UserInsertTest() {
User user = User.builder().name("曹操").password("123fdkfjk").age(33).build();

int insert = userMapper.insert(user);
System.out.println(insert);
System.out.println(user);
}
}
​

2020-03-14 18:32:54,024 INFO (StartupInfoLogger.java:61)- Started SpringBootMybatisPlusApplicationTests in 5.053 seconds (JVM running for 7.025)
2020-03-14 18:32:54,536 INFO (HikariDataSource.java:110)- HikariPool-1 - Starting...
2020-03-14 18:32:55,814 INFO (HikariDataSource.java:123)- HikariPool-1 - Start completed.
2020-03-14 18:32:55,830 DEBUG (BaseJdbcLogger.java:143)- ==>  Preparing: INSERT INTO tb_user ( user_name, password, age ) VALUES ( ?, ?, ? ) 
2020-03-14 18:32:55,887 DEBUG (BaseJdbcLogger.java:143)- ==> Parameters: 曹操(String), 123fdkfjk(String), 33(Integer)
2020-03-14 18:32:55,906 DEBUG (BaseJdbcLogger.java:143)- <==    Updates: 1
1
User(id=3, name=曹操, password=123fdkfjk, age=33)