SpringBoot(五)mybatis-plus的使用

上次實現了springBoot+mybatis的整合，第一感覺就是所有操作都需要去寫sql，特別是插入、修改等簡單操作都需要寫sql，感覺使用起來特別麻煩。

正當自己猶豫是否放棄mybatis時候，有朋友告訴我，mybatis-plus可以解決我的煩惱，這裏記錄下mybatis-plus與springboot的整合。

第一步：pom的內容改造

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>mybatis-test</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.5.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>
        <mybatis-plus.version>3.0.6</mybatis-plus.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>${mybatis-plus.version}</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>${mybatis-plus.version}</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>

其實其他的跟以前的基本一樣，主要注意下面這塊內容；

 <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <mybatis-plus.version>3.0.6</mybatis-plus.version>
    </properties>
............
.................
 <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>${mybatis-plus.version}</version>
        </dependency>

第二步：controller和entity都跟第四節內容是一樣的，這裏不介紹了。使用mybatis-plus後，service和dao層稍微不一樣，具體代碼如下：

UserService的內容：

package com.service;

import com.entity.User;
import com.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 15:23
 */
@Service
public class UserService {
    @Autowired
    UserMapper userMapper;
    public User Sel(int id){
        return userMapper.selectById(id);
    }
}

這裏直接調用的是mybatis-plus的方法進行對象的查詢。

package com.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.entity.User;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

/**
 * @Author:wjup
 * @Date: 2018/9/26 0026
 * @Time: 15:20
 */
@Repository
public interface UserMapper extends BaseMapper<User> {

}

第三步：配置mybatis-plus的相關配置信息：

server:
  port: 8080

spring:
  datasource:
    username: root
    password: weiyong813
    url: jdbc:mysql://localhost:3306/springboot?useUnicode=true&useSSL=false&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver

mybatis-plus:
  mapper-locations: classpath:mapping/*Mapper.xml
  #實體掃描，多個package用逗號或者分號分隔
  typeAliasesPackage: com.entity
  global-config:
    #主鍵類型  0:"數據庫ID自增", 1:"用戶輸入ID",2:"全局唯一ID (數字類型唯一ID)", 3:"全局唯一ID UUID";
    id-type: 0
    #字段策略 0:"忽略判斷",1:"非 NULL 判斷"),2:"非空判斷"
    field-strategy: 2
    #駝峯下劃線轉換
    db-column-underline: true
    #刷新mapper 調試神器
    refresh-mapper: true
    #數據庫大寫下劃線轉換
    #capital-mode: true
    # Sequence序列接口實現類配置
    #key-generator: com.baomidou.mybatisplus.incrementer.OracleKeyGenerator
    #邏輯刪除配置
    #logic-delete-value: -1
    #logic-not-delete-value: 0
    #自定義填充策略接口實現
    #meta-object-handler: com.baomidou.springboot.xxx
    #自定義SQL注入器
  configuration:
    map-underscore-to-camel-case: true
    cache-enabled: false
    call-setters-on-nulls: true

#showSql
logging:
  level:
    com:
        mapper : debug

sql語句創建表

-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(32) NOT NULL AUTO_INCREMENT,
  `user_name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `pass_word` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
  `real_name` varchar(32) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

SET FOREIGN_KEY_CHECKS = 1;

到此就完成了整合，可以在瀏覽器中輸入：http://127.0.0.1:8080/UserInfo/getUser/1

看到如下內容，表示已經成功。

User{id=1, userName=‘dsds’, passWord=‘1ewe’, realName=‘2121212’}

細節備註：

這裏掃描mapper層採用的是DemoApplication中添加註解方式

第一種方式：註解方式

package com;


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

@MapperScan("com.mapper") //掃描的mapper
@SpringBootApplication
public class DemoApplication {

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

第二種方式：就是通過新建config文件：

MybatisPlusConfig

package com.config;


import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@MapperScan(basePackages = "com.mapper")
public class MybatisPlusConfig {
    /**
     * mybatis-plus 分頁插件
     */
    @Bean
    public PerformanceInterceptor performanceInterceptor() {
        return new PerformanceInterceptor();
    }
}

gitee的下載地址： [email protected]:going100/go-demo.git