SpringBoot快速整合Mybatis、MybatisPlus(代码生成器)实现数据库访问功能

<?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>2.3.3.RELEASE</version>
    </parent>

    <groupId>com.gcl</groupId>
    <artifactId>vue_day03_admin</artifactId>
    <version>1.0-SNAPSHOT</version>

    <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>

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

        <!--mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>

        <!--mybatis-plus代码生成器-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.2.0</version>
        </dependency>

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


        <!--mysql驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.46</version>
        </dependency>

        <!--数据库连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.21</version>
        </dependency>


        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

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

        <!--lang3工具类-->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.10</version>
        </dependency>
    </dependencies>

    <!-- maven插件，可以将应用打包成一个可执行的jar包；-->
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

server:
  port: 8088

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    url: jdbc:mysql://192.168.0.131:3306/vue_day03?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    username: root
    password: Root@123456

mybatis-plus:
  type-aliases-package: com.gcl.entity
  configuration:
    map-underscore-to-camel-case: true
    use-generated-keys: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  mapper-locations: classpath:com/gcl/mapper/*Mapper.xml

logging:
  level:
    com.demo.mapper: debug

package com.gcl.utils;

import com.baomidou.mybatisplus.annotation.DbType;
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.converts.MySqlTypeConvert;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.IColumnType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import org.apache.commons.lang3.StringUtils;

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

// 执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
public class CodeGenerator {

    /**
     * <p>
     * 读取控制台内容
     * </p>
     */
    public static String scanner(String tip) {
        Scanner scanner = new Scanner(System.in);
        StringBuilder help = new StringBuilder();
        help.append("请输入" + tip + "：");
        System.out.println(help.toString());
        if (scanner.hasNext()) {
            String ipt = scanner.next();
            if (StringUtils.isNotEmpty(ipt)) {
                return ipt;
            }
        }
        throw new MybatisPlusException("请输入正确的" + tip + "！");
    }

    public static void main(String[] args) {
        // 代码生成器
        AutoGenerator mpg = new AutoGenerator();

        // 全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/vue_day03_admin/src/main/java");
        gc.setAuthor("gcl");
        // 是否打开输出目录，默认true
        gc.setOpen(false);
        // 开启 ActiveRecord 模式，默认false
        gc.setActiveRecord(true);
        // 是否覆盖已有文件
        gc.setFileOverride(true);
        // XML 开启 BaseResultMap
        gc.setBaseResultMap(true);
        // XML 开启 baseColumnList
        gc.setBaseColumnList(true);

        // 自定义文件命名，注意 %s 会自动填充表实体属性！
        // gc.setMapperName("%sDao");
        // gc.setXmlName("%sMapper");
         gc.setServiceName("%sService");
        // gc.setServiceImplName("%sServiceDiy");
        // gc.setControllerName("%sAction");

        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setDbType(DbType.MYSQL);

        dsc.setUrl("jdbc:mysql://192.168.0.131:3306/vue_day03?useUnicode=true&useSSL=false&characterEncoding=utf8");
        dsc.setDriverName("com.mysql.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("Root@123456");
        dsc.setTypeConvert(new MySqlTypeConvert(){
            // 自定义数据库表字段类型转换【可选】
            @Override
            public IColumnType processTypeConvert(GlobalConfig globalConfig, String fieldType) {
                System.out.println("转换类型：" + fieldType);
                // 注意！！processTypeConvert 存在默认类型转换，如果不是你要的效果请自定义返回、非如下直接返回。
                return super.processTypeConvert(globalConfig, fieldType);
            }
        });
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();

        // com.demo.user
        pc.setParent("com");
//        pc.setModuleName("user");
        pc.setModuleName(scanner("模块名"));
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // TODO
            }
        };

        mpg.setCfg(cfg);

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";

        // 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 + "/vue_day03_admin/src/main/resources/com/gcl/mapper"
                        + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
            }
        });
        cfg.setFileOutConfigList(focList);
        mpg.setCfg(cfg);

        // 配置模板
        TemplateConfig templateConfig = new TemplateConfig();

        templateConfig.setXml(null);
        mpg.setTemplate(templateConfig);

        // 策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        // 此处可以修改为您的表前缀
        strategy.setTablePrefix(new String[] { "tb_", "tsys_","t_" });
        // 表名生成策略
        strategy.setNaming(NamingStrategy.underline_to_camel);
        // 需要生成的表
        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
//        strategy.setInclude(new String[] { "tb_user" });
        strategy.setEntityBuilderModel(true);

        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }

}

CREATE TABLE `t_user` (
  `id` int(60) NOT NULL AUTO_INCREMENT COMMENT "主键",
  `username` varchar(255) DEFAULT NULL COMMENT "姓名",
  `salary` double(7,2) DEFAULT NULL COMMENT "薪水",
  `age` int(11) DEFAULT NULL,
  `desc` varchar(255) DEFAULT NULL COMMENT "描述",
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

package com.gcl.config;

import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * @ClassName MyBatisPlusConfig
 * @Description TODO
 * @Author gcl
 * @Date 2021-03-18 8:36
 **/
@Configuration
public class MyBatisPlusConfig {
    /**
     * mybatis-plus 分页插件
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
        return paginationInterceptor;
    }
}

INSERT INTO `vue_day03`.`t_user` (`id`, `username`, `salary`, `age`, `desc`) VALUES ("1", "张三", "2000.00", "23", "95年05月生");
INSERT INTO `vue_day03`.`t_user` (`id`, `username`, `salary`, `age`, `desc`) VALUES ("2", "李四", "3000.00", "24", "96年06年生");
INSERT INTO `vue_day03`.`t_user` (`id`, `username`, `salary`, `age`, `desc`) VALUES ("3", "王五", "4000.00", "25", "07年07年生");
INSERT INTO `vue_day03`.`t_user` (`id`, `username`, `salary`, `age`, `desc`) VALUES ("4", "赵六", "5000.00", "26", "08年08月生");
INSERT INTO `vue_day03`.`t_user` (`id`, `username`, `salary`, `age`, `desc`) VALUES ("5", "田七", "6000.00", "27", "09年09月生");

package com.gcl.controller;

import com.baomidou.mybatisplus.core.conditions.query.Query;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.gcl.entity.User;
import com.gcl.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

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

import java.util.List;

/**
 * <p>
 *  前端控制器
 * </p>
 *
 * @author gcl
 * @since 2021-04-10
 */
@RestController
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;


    /**
     *
     * @param pageNo 当前页
     * @param pageSize 每页显示的记录数
     * @return
     */
    @GetMapping
    public List<User> findList(int pageNo,int pageSize){


        //创建查询条件封装器
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        
        Page<User> page = new Page<>(pageNo, pageSize);

        IPage<User> iPage = userService.page(page, wrapper);

        List<User> records = iPage.getRecords();

        return records;

    }

}