1、SpringBoot+MybatisPlus整合

 <?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.xm</groupId>
     <artifactId>Springboot_MybatisPlus</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>

     <name>Springboot_MybatisPlus</name>
     <description>Demo project for Spring Boot</description>

     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.14.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <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>
         <!--  添加MP依赖-->
         <dependency>
           <groupId>com.baomidou</groupId>
           <artifactId>mybatis-plus-boot-starter</artifactId>
           <version>2.3</version>
         </dependency>

         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

开发工具：STS

代码下载链接：https://github.com/theIndoorTrain/Springboot_MybatisPlus

版本：

　　Springboot：1.5.14.RELEASE

　　　　使用2.0以上的Springboot，会报出一些异常。欢迎知道异常原因的大牛解惑。

　　MybatisPlus：2.3

参考文档：MybatisPlus官网

前言：

　　Mybatis是一款灵活的持久层框架，它解放了sql，把sql的控制完全交于开发者，保证了sql的灵活性。

　　MP（MybatisPlus）是对Mybatis的增强，它把通用的mapper帮我们实现好了，我们直接调用就可以。

　　它还提供了条件构造器、强大的代码生成、各种优秀的插件......

　　都会给我们的开发带来便利。

　　现在，我们开始使用MP。

搭建项目：

1.添加依赖

 <?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.xm</groupId>
     <artifactId>Springboot_MybatisPlus</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>

     <name>Springboot_MybatisPlus</name>
     <description>Demo project for Spring Boot</description>

     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.14.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <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>
         <!--  添加MP依赖-->
         <dependency>
           <groupId>com.baomidou</groupId>
           <artifactId>mybatis-plus-boot-starter</artifactId>
           <version>2.3</version>
         </dependency>

         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

2.建表

3.配置数据库连接：

 spring:
   datasource:
     url: jdbc:mysql://10.1.51.31:3306/xm?useSSL=true
     username: root
     password: cube1501
     driver-class-name: com.mysql.jdbc.Drive

4.添加Student实体：

 package com.xm.pojo;
 /**
  * 学生实体
  * @author xm
  *
  */
 public class Student {

     private Integer id;
     private String name;
     public Integer getId() {
         return id;
     }
     public void setId(Integer id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }

     @Override
     public String toString() {
         return "Student [id=" + id + ", name=" + name + "]";
     }

 }

5.添加mapper接口：

package com.xm.mapper;

import com.baomidou.mybatisplus.mapper.BaseMapper;
import com.xm.pojo.Student;

public interface StudentMapper extends BaseMapper<Student> {

}

6.开启Mapper扫描：

 package com.xm;

 import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;

 @SpringBootApplication
 //开启mapper包扫描
 @MapperScan("com.xm.mapper")
 public class SpringbootMybatisPlusApplication {

     public static void main(String[] args) {
         SpringApplication.run(SpringbootMybatisPlusApplication.class, args);
     }
 }

7.测试：

package com.xm;

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 com.xm.mapper.StudentMapper;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootMybatisPlusApplicationTests {
    @Autowired
    private StudentMapper studentMapper;

    @Test
    public void contextLoads() {
        System.out.println(studentMapper.selectById(1));
    }

}

8.运行结果

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　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　2018-07-19