搭建mybatis-plus学习

本文主要是介绍搭建mybatis-plus学习，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

1、搭建springboot+maven

 2、添加依赖：

<dependencies>
    <!--Mybatis-Plus依赖-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <version>3.3.2</version>
    </dependency>
    <!--Mybatis-Plus代码生成器-->
    <dependency>
        <groupId>com.baomidou</groupId>
        <artifactId>mybatis-plus-generator</artifactId>
        <version>3.3.2</version>
    </dependency>
    <!--Velocity模板生成引擎-->
    <dependency>
        <groupId>org.apache.velocity</groupId>
        <artifactId>velocity-engine-core</artifactId>
        <version>2.2</version>
    </dependency>
</dependencies>

3、在SpringBoot配置文件application.yml添加如下配置，配置好数据源和MyBatis-Plus；

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/mall?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
    username: root
    password: root

mybatis-plus:
  mapper-locations: classpath:/mapper/**/*.xml #指定mapper.xml路径
  global-config:
    db-config:
      id-type: auto #全局默认主键类型设置为自增
  configuration:
    auto-mapping-behavior: partial #只对非嵌套的 resultMap 进行自动映射
    map-underscore-to-camel-case: true #开启自动驼峰命名规则映射

4、添加MyBatis-Plus的Java配置，使用@MapperScan注解配置好需要扫码的Mapper接口路径，MyBatis-Plus自带分页功能，需要配置好分页插件PaginationInterceptor。

/**
 * MyBatis配置类
 */
@Configuration
@MapperScan("com.test.zyj.modules.*.mapper")
public class MyBatisConfig {
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        paginationInterceptor.setCountSqlParser(new JsqlParserCountOptimize(true));
        return paginationInterceptor;
    }
}

代码生成器

MyBatis-Plus 提供了代码生成器，可以一键生成controller、service、mapper、model、mapper.xml代码，非常方便！

首先我们创建代码生成器类MyBatisPlusGenerator，直接运行其main方法即可生成相关代码；

package com.test.zyj.generator;

import cn.hutool.core.util.StrUtil;
import cn.hutool.setting.dialect.Props;
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.LikeTable;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.VelocityTemplateEngine;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

/**
 * MyBatisPlus代码生成器
 */
public class MyBatisPlusGenerator {
    public static void main(String[] args) {
        String projectPath = System.getProperty("user.dir") + "/mybatis-plus";
        String moduleName = scanner("模块名");
        String[] tableNames = scanner("表名，多个英文逗号分割").split(",");
        // 代码生成器
        AutoGenerator autoGenerator = new AutoGenerator();
        autoGenerator.setGlobalConfig(initGlobalConfig(projectPath));
        autoGenerator.setDataSource(initDataSourceConfig());
        autoGenerator.setPackageInfo(initPackageConfig(moduleName));
        autoGenerator.setCfg(initInjectionConfig(projectPath, moduleName));
        autoGenerator.setTemplate(initTemplateConfig());
        autoGenerator.setStrategy(initStrategyConfig(tableNames));
        autoGenerator.setTemplateEngine(new VelocityTemplateEngine());
        autoGenerator.execute();
    }

    /**
     * 读取控制台内容信息
     */
    private static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        System.out.println(("请输入" + tip + "："));
        if (scanner.hasNext()) {
            String next = scanner.next();
            if (StrUtil.isNotEmpty(next)) {
                return next;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    /**
     * 初始化全局配置
     */
    private static GlobalConfig initGlobalConfig(String projectPath) {
        GlobalConfig globalConfig = new GlobalConfig();
        globalConfig.setOutputDir(projectPath + "/src/main/java");
        globalConfig.setAuthor("zyj");
        globalConfig.setOpen(false);
        globalConfig.setSwagger2(true);
        globalConfig.setBaseResultMap(true);
        globalConfig.setFileOverride(true);
        globalConfig.setDateType(DateType.ONLY_DATE);
        globalConfig.setEntityName("%s");
        globalConfig.setMapperName("%sMapper");
        globalConfig.setXmlName("%sMapper");
        globalConfig.setServiceName("%sService");
        globalConfig.setServiceImplName("%sServiceImpl");
        globalConfig.setControllerName("%sController");
        return globalConfig;
    }

    /**
     * 初始化数据源配置
     */
    private static DataSourceConfig initDataSourceConfig() {
        Props props = new Props("generator.properties");
        DataSourceConfig dataSourceConfig = new DataSourceConfig();
        dataSourceConfig.setUrl(props.getStr("dataSource.url"));
        dataSourceConfig.setDriverName(props.getStr("dataSource.driverName"));
        dataSourceConfig.setUsername(props.getStr("dataSource.username"));
        dataSourceConfig.setPassword(props.getStr("dataSource.password"));
        return dataSourceConfig;
    }

    /**
     * 初始化包配置
     */
    private static PackageConfig initPackageConfig(String moduleName) {
        Props props = new Props("generator.properties");
        PackageConfig packageConfig = new PackageConfig();
        packageConfig.setModuleName(moduleName);
        packageConfig.setParent(props.getStr("package.base"));
        packageConfig.setEntity("model");
        return packageConfig;
    }

    /**
     * 初始化模板配置
     */
    private static TemplateConfig initTemplateConfig() {
        TemplateConfig templateConfig = new TemplateConfig();
        //可以对controller、service、entity模板进行配置
        //mapper.xml模板需单独配置
        templateConfig.setXml(null);
        return templateConfig;
    }

    /**
     * 初始化策略配置
     */
    private static StrategyConfig initStrategyConfig(String[] tableNames) {
        StrategyConfig strategyConfig = new StrategyConfig();
        strategyConfig.setNaming(NamingStrategy.underline_to_camel);
        strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);
        strategyConfig.setEntityLombokModel(true);
        strategyConfig.setRestControllerStyle(true);
        //当表名中带*号时可以启用通配符模式
        if (tableNames.length == 1 && tableNames[0].contains("*")) {
            String[] likeStr = tableNames[0].split("_");
            String likePrefix = likeStr[0] + "_";
            strategyConfig.setLikeTable(new LikeTable(likePrefix));
        } else {
            strategyConfig.setInclude(tableNames);
        }
        return strategyConfig;
    }

    /**
     * 初始化自定义配置
     */
    private static InjectionConfig initInjectionConfig(final String projectPath, final String moduleName) {
        // 自定义配置
        InjectionConfig injectionConfig = new InjectionConfig() {
            @Override
            public void initMap() {
                // 可用于自定义属性
            }
        };
        // 模板引擎是Velocity
        String templatePath = "/templates/mapper.xml.vm";
        // 自定义输出配置
        List<FileOutConfig> focList = new ArrayList<>();
        // 自定义配置会被优先输出
        focList.add(new FileOutConfig(templatePath) {
            @Override
            public String outputFile(TableInfo tableInfo) {
                // 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
                return projectPath + "/src/main/resources/mapper/" + moduleName
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        injectionConfig.setFileOutConfigList(focList);
        return injectionConfig;
    }

}

然后在resources目录下添加配置文件generator.properties，添加代码生成器的数据源配置及存放业务代码的基础包名称；

dataSource.url=jdbc:mysql://localhost:3306/mall?useUnicode=true&characterEncoding=utf-8&serverTimezone=Asia/Shanghai
dataSource.driverName=com.mysql.cj.jdbc.Driver
dataSource.username=root
dataSource.password=root
package.base=com.test.zyj.modules

运行代码生成器MyBatisPlusGenerator中的main方法，依次在控制台输入信息：

 代码中的结果：

 红框标识是自动生成的。

CRUD操作：

controller:

package com.test.zyj.modules.pms.controller;


import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.test.zyj.common.CommonResult;
import com.test.zyj.modules.pms.model.PmsBrand;
import com.test.zyj.modules.pms.service.PmsBrandService;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

/**
 * <p>
 * 品牌表 前端控制器
 * </p>
 *
 * @author zyj
 * @since 2022-03-11
 */
@RestController
@RequestMapping("/pms/pmsBrand")
public class PmsBrandController {
    @Autowired
    private PmsBrandService brandService;

    @ApiOperation("获取所有品牌列表")
    @RequestMapping(value = "/listAll", method = RequestMethod.GET)
    @ResponseBody
    public CommonResult<List<PmsBrand>> getBrandList() {
        QueryWrapper<PmsBrand> wrapper = new QueryWrapper<>();
        wrapper.eq("id",1);
        List<PmsBrand> list = brandService.list(wrapper);
        return CommonResult.success(list);
    }
}

其他的自己填。。。

postman调用看看：

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