springboot mybatis plus 使用入門

因爲最近入職新公司，dao層選型mybatis，所以研究下mybatis plus腳手架，其優點，具體可以去官網查看，例子選的版本mybatis-plus-boot-starter 版本 3.0.4，代碼生成器版本，mybatis-plus-generator 版本 3.0.3

。

教程分爲兩部門：

1.從數據庫層反向生成 dao,service,controller。

2.測試單元增刪改成。

1.從數據庫層反向生成 dao,service,controller。

1.1 mysql 數據結構準備

/*
Navicat MySQL Data Transfer

Source Server         : db
Source Server Version : 50528
Source Host           : localhost:3306
Source Database       : myth

Target Server Type    : MYSQL
Target Server Version : 50528
File Encoding         : 65001

Date: 2019-02-17 14:25:40
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for myth_inventory
-- ----------------------------
DROP TABLE IF EXISTS `myth_inventory`;
CREATE TABLE `myth_inventory` (
  `trans_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL,
  `target_class` varchar(256) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `target_method` varchar(128) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `retried_count` int(3) NOT NULL,
  `create_time` datetime NOT NULL,
  `last_time` datetime NOT NULL,
  `version` int(6) NOT NULL,
  `status` int(2) NOT NULL,
  `invocation` longblob,
  `role` int(2) NOT NULL,
  `error_msg` text COLLATE utf8mb4_unicode_ci,
  PRIMARY KEY (`trans_id`),
  KEY `status_last_time` (`last_time`,`status`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

-- ----------------------------
-- Table structure for myth_order
-- ----------------------------
DROP TABLE IF EXISTS `myth_order`;
CREATE TABLE `myth_order` (
  `trans_id` varchar(64) COLLATE utf8mb4_unicode_ci NOT NULL,
  `target_class` varchar(256) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `target_method` varchar(128) COLLATE utf8mb4_unicode_ci DEFAULT NULL,
  `retried_count` int(3) NOT NULL,
  `create_time` datetime NOT NULL,
  `last_time` datetime NOT NULL,
  `version` int(6) NOT NULL,
  `status` int(2) NOT NULL,
  `invocation` longblob,
  `role` int(2) NOT NULL,
  `error_msg` text COLLATE utf8mb4_unicode_ci,
  PRIMARY KEY (`trans_id`),
  KEY `status_last_time` (`last_time`,`status`) USING BTREE
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

1.2 pom 座標引入

<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.3.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.hys</groupId>
	<artifactId>mybatis</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>mybatis</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</artifactId>
		</dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!--mybatis 官網引入 https://mp.baomidou.com/guide/quick-start.html#添加依賴 -->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-boot-starter</artifactId>
			<version>3.0.4</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>6.0.4</version>
		</dependency>

		<!-- mybatis  end-->

		<!--代碼生成器-->
		<dependency>
			<groupId>com.baomidou</groupId>
			<artifactId>mybatis-plus-generator</artifactId>
			<version>3.0.3</version>
		</dependency>

		<dependency>
			<groupId>org.freemarker</groupId>
			<artifactId>freemarker</artifactId>
		</dependency>

	</dependencies>

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

</project>

1.3 代碼生成器根據數據庫反向生成java

springboot 配置文件

application.properties

spring.profiles.active=dev

application-dev.properties

spring.datasource.url=jdbc:mysql://localhost:3306/myth?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.username=root
spring.datasource.password=root

package com.hys.mybatis;
 
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.converts.MySqlTypeConvert;
import com.baomidou.mybatisplus.generator.config.rules.DbColumnType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
 
/**
 * <p>
 * 代碼生成器演示
 * </p>
 */
public class MpGenerator {
 
    public static void main(String[] args) {
//        assert (false) : "代碼生成屬於危險操作，請確定配置後取消斷言執行代碼生成！";
        AutoGenerator mpg = new AutoGenerator();
        // 選擇 freemarker 引擎，默認 Velocity
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
 
        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        gc.setAuthor("ahys");
        gc.setOutputDir("G:\\springboot-mybatis\\src\\main\\java");
        gc.setFileOverride(false);// 是否覆蓋同名文件，默認是false
        gc.setActiveRecord(true);// 不需要ActiveRecord特性的請改爲false
        gc.setEnableCache(false);// XML 二級緩存
        gc.setBaseResultMap(true);// XML ResultMap
        gc.setBaseColumnList(false);// XML columList
        /* 自定義文件命名，注意 %s 會自動填充表實體屬性！ */
         gc.setMapperName("%sDao");
        // gc.setXmlName("%sDao");
         //gc.setServiceName("%sService");
         //gc.setServiceImplName("%sServiceImpl");
        // gc.setControllerName("%sAction");
        mpg.setGlobalConfig(gc);
 
        // 數據源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setDbType(DbType.MYSQL);
        dsc.setTypeConvert(new MySqlTypeConvert());
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("root");
        dsc.setUrl("jdbc:mysql://localhost:3306/myth?useUnicode=true&characterEncoding=UTF-8&serverTimezone=Asia/Shanghai");
        mpg.setDataSource(dsc);
 
        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        // strategy.setCapitalMode(true);// 全局大寫命名 ORACLE 注意
        //strategy.setTablePrefix(new String[] { "user_" });// 此處可以修改爲您的表前綴
        strategy.setNaming(NamingStrategy.underline_to_camel);// 表名生成策略
        //strategy.setInclude(new String[] { "user" }); // 需要生成的表
        // strategy.setExclude(new String[]{"test"}); // 排除生成的表
        // 自定義實體父類
        // strategy.setSuperEntityClass("com.baomidou.demo.TestEntity");
        // 自定義實體，公共字段
        // strategy.setSuperEntityColumns(new String[] { "test_id", "age" });
        // 自定義 mapper 父類
        // strategy.setSuperMapperClass("com.baomidou.demo.TestMapper");
        // 自定義 service 父類
        // strategy.setSuperServiceClass("com.baomidou.demo.TestService");
        // 自定義 service 實現類父類
        // strategy.setSuperServiceImplClass("com.baomidou.demo.TestServiceImpl");
        // 自定義 controller 父類
        // strategy.setSuperControllerClass("com.baomidou.demo.TestController");
        // 【實體】是否生成字段常量（默認 false）
        // public static final String ID = "test_id";
        // strategy.setEntityColumnConstant(true);
        // 【實體】是否爲構建者模型（默認 false）
        // public User setName(String name) {this.name = name; return this;}
        // strategy.setEntityBuilderModel(true);
        mpg.setStrategy(strategy);
 
        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setParent("com.hys.mybatis.mapper");
        // pc.setModuleName("test");
        mpg.setPackageInfo(pc);
 
        // 注入自定義配置，可以在 VM 中使用 cfg.abc 【可無】
        // InjectionConfig cfg = new InjectionConfig() {
        // @Override
        // public void initMap() {
        // Map<String, Object> map = new HashMap<String, Object>();
        // map.put("abc", this.getConfig().getGlobalConfig().getAuthor() +
        // "-mp");
        // this.setMap(map);
        // }
        // };
        //
        // // 自定義 xxList.jsp 生成
        // List<FileOutConfig> focList = new ArrayList<>();
        // focList.add(new FileOutConfig("/template/list.jsp.vm") {
        // @Override
        // public String outputFile(TableInfo tableInfo) {
        // // 自定義輸入文件名稱
        // return "D://my_" + tableInfo.getEntityName() + ".jsp";
        // }
        // });
        // cfg.setFileOutConfigList(focList);
        // mpg.setCfg(cfg);
        //
        // // 調整 xml 生成目錄演示
        // focList.add(new FileOutConfig("/templates/mapper.xml.vm") {
        // @Override
        // public String outputFile(TableInfo tableInfo) {
        // return "/develop/code/xml/" + tableInfo.getEntityName() + ".xml";
        // }
        // });
        // cfg.setFileOutConfigList(focList);
        // mpg.setCfg(cfg);
        //
        // // 關閉默認 xml 生成，調整生成 至 根目錄
        // TemplateConfig tc = new TemplateConfig();
        // tc.setXml(null);
        // mpg.setTemplate(tc);
 
        // 自定義模板配置，可以 copy 源碼 mybatis-plus/src/main/resources/templates 下面內容修改，
        // 放置自己項目的 src/main/resources/templates 目錄下, 默認名稱一下可以不配置，也可以自定義模板名稱
        // TemplateConfig tc = new TemplateConfig();
        // tc.setController("...");
        // tc.setEntity("...");
        // tc.setMapper("...");
        // tc.setXml("...");
        // tc.setService("...");
        // tc.setServiceImpl("...");
        // 如上任何一個模塊如果設置 空 OR Null 將不生成該模塊。
        // mpg.setTemplate(tc);
 
        // 執行生成
        mpg.execute();
 
        // 打印注入設置【可無】
        // System.err.println(mpg.getCfg().getMap().get("abc"));
    }
}

運行上述代碼，生成如圖代碼結構，

2.測試單元增刪改成。

直接上代碼

package com.hys.mybatis;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PerformanceInterceptor;

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

@SpringBootApplication
@MapperScan("com.hys.mybatis.mapper.mapper")
public class MybatisApplication {

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


	/**
	 * 分頁插件
	 */
	@Bean
	public PaginationInterceptor paginationInterceptor() {
		return new PaginationInterceptor();
	}

	/**
	 * SQL執行效率插件
	 */
	@Bean
	@Profile({"dev","test"})// 設置 dev test 環境開啓
	public PerformanceInterceptor performanceInterceptor() {
		return new PerformanceInterceptor();
	}
}

package com.hys.mybatis;


import com.baomidou.mybatisplus.core.conditions.Wrapper;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import com.baomidou.mybatisplus.core.toolkit.support.Property;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.hys.mybatis.mapper.entity.MythInventory;
import com.hys.mybatis.mapper.mapper.MythInventoryDao;

import org.junit.Assert;
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 java.time.LocalDateTime;
import java.util.Date;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class MybatisApplicationTests {

	@Autowired
	MythInventoryDao mythInventoryDao;

	//查詢
	@Test
	public void select() {
		//        List<User> lambdaUsers = userMapper.selectList(new QueryWrapper<User>().lambda().eq(User::getRoleId, 2L));

		MythInventory mythInventory = mythInventoryDao.selectOne(new QueryWrapper <MythInventory>().lambda().eq(MythInventory::getTransId, "1"));//mythInventoryDao.selectById("1");
		System.out.println(mythInventory);
	}


	//插入
	@Test
	public void inset() {
		MythInventory mythInventory = new MythInventory();
		mythInventory.setErrorMsg("1111");
		mythInventory.setTargetClass("class2");
		mythInventory.setStatus(1);
		mythInventory.setTransId("2");
		mythInventory.setRetriedCount(1);
		mythInventory.setCreateTime(new Date());
		mythInventory.setLastTime(new Date());
		mythInventory.setRole(1);
		mythInventory.setVersion(1);
		mythInventoryDao.insert(mythInventory);

	}



	//更新

	@Test
	public void update(){
		/*MythInventory mythInventory = mythInventoryDao.selectOne(new QueryWrapper <MythInventory>().lambda().eq(MythInventory::getTransId, "1"));//mythInventoryDao.selectById("1");
		System.out.println(mythInventory);
		mythInventory.setTargetClass("更新class");
		mythInventoryDao.updateById(mythInventory);*/

		MythInventory mythInventory2 =new MythInventory();
		UpdateWrapper<MythInventory> wrapper = new UpdateWrapper <>();
		wrapper.lambda().eq(MythInventory::getTransId,"23");
		mythInventory2.setErrorMsg("錯誤哦信息");
		mythInventoryDao.update(mythInventory2,wrapper);
	}



	@Test
	public void wapperSelect(){

		//sql 語法
		List <MythInventory> mythInventories = mythInventoryDao.selectList(new QueryWrapper <MythInventory>().lambda().inSql(MythInventory::getTransId, "select 1 from dual"));
		System.out.println("sql: "+mythInventories.size());


	}

	//分頁
	@Test
	public void page(){

		Page<MythInventory> page = new Page<>(1, 2);
		QueryWrapper<MythInventory> queryWrapper = new QueryWrapper<>();
		queryWrapper.lambda().orderByDesc(MythInventory::getCreateTime).orderByAsc(MythInventory::getVersion);

		IPage<MythInventory> pageList = mythInventoryDao.selectPage(page, queryWrapper);
		print(pageList.getRecords());
	}

	@Test
	public void selectBySql(){
		List <MythInventory> mythInventories = mythInventoryDao.queryForSql("2");
		print(mythInventories);
	}

	private <T> void print(List<T> list) {
		if (!CollectionUtils.isEmpty(list)) {
			list.forEach(System.out::println);
		}
	}

}

最後代碼下載地址

springboot mybatis plus 使用入門

微服務的4個設計原則和19個解決方案（轉載）

atlas安裝

elasticsearch 腳本排序

yapi 安裝

springboot mybatis plus 使用入門

https://yachay.unat.edu.pe/blog/index.php?comment_area=format_blog&comment_component=blog&comment_co

linux以太網驅動總結