springBoot 整合 mybatis-plus

一、springBoot 整合 mybatis-plus

<!--        数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
<!--        mybatis-plus-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.2.0</version>
        </dependency>
<!--        代码生成-->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-generator</artifactId>
            <version>3.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>

二、增删改查

1. 插入

void insert() {
        User user = new User();
//        user.setId(10L);
        user.setUsername("wangwu");
        user.setPassword("255223");
        user.setStatus(0);

        int result = userMapper.insert(user);
        System.out.println(result);
    }	

2. 查询

 @Test
    void selectById(){
        User user = new User();
        user.setId(1L);

        user = userMapper.selectById(user.getId());
        System.out.println(user);
    }
    @Test
    void selectByMap(){
        HashMap<String, Object> map = new HashMap<>();
        map.put("userName", "lisi");
        map.put("passWord", "789456");
        List<User> users = userMapper.selectByMap(map);
        System.out.println("=======================================");
        users.forEach(System.out::println);
    }
    @Test
    void selectBatchIds(){
        List<User> users = userMapper.selectBatchIds(Arrays.asList(1, 2, 3));
        System.out.println(users);
    }

4. 分页查询

• 添加配置

    // 分页插件
    @Bean
    public PaginationInterceptor paginationInterceptor(){
        return new PaginationInterceptor();
    }

• 查询测试

    @Test
    void page(){
        Page<User> page = new Page<>(0, 2);
        userMapper.selectPage(page, null);

        page.getRecords().forEach(System.out::println);
        System.out.println(page.getTotal());
    }

4. 更新

    @Test
    void update(){
        User user = new User();
        user.setId(4L);
        user.setUsername("lisi");
        user.setPassword("88978974");
        user.setStatus(1);

        int result = userMapper.updateById(user);
        System.out.println(result);
    }

5. 删除

• 配置逻辑删除

  1. 数据库添加 deleted 字段，默认值为 0；

  2. 实体类添加属性

  @TableLogic //逻辑删除
  private Integer deleted;
  

  3. 配置逻辑删除组件（高版本不需要）

  // 逻辑删除组件！
  @Bean
  public ISqlInjector sqlInjector() {
  return new LogicSqlInjector();
  }
  

  4. 配置 springBoot

  mybatis-plus.global-config.db-config.logic-delete-value=1
  mybatis-plus.global-config.db-config.logic-not-delete-value=0
  

• 删除测试

// 通过 Id 删除
    @Test
    void deleteById(){
        userMapper.deleteById(1L);
    }

// 通过 id 批量删除
    @Test
    void deleteByBatchs(){
        userMapper.deleteBatchIds(Arrays.asList(3, 4));
    }

// 通过 map 删除
    @Test
    void deleteByMap(){
        HashMap<String, Object> map = new HashMap<>();
        map.put("userName", "zhangsan");
        userMapper.deleteByMap(map);
    }

三、条件构造器

// isNotNull 语句
	@Test
    void test(){
        QueryWrapper<User> wrapper = new QueryWrapper<>();
        wrapper.isNotNull("userName").isNotNull("email").ge("id", 0);
        userMapper.selectList(wrapper).forEach(System.out::println);
    }

// eq 语句
    @Test
    void test1(){
        QueryWrapper<User> wrapper = new QueryWrapper<User>();
        wrapper.eq("userName", "zhangsan");
        // User user =  userMapper.selectOne(wrapper); // 查询一条
        List<User> users = userMapper.selectList(wrapper); //查询数组
        System.out.println(users);
    }

// between 语句
    @Test
    void test2(){
        QueryWrapper<User> wrapper = new QueryWrapper<User>();
        wrapper.between("id", 1, 3);
        int count = userMapper.selectCount(wrapper);
        System.out.println(count);
    }

// noLike 语句
    @Test
    void test3(){
        QueryWrapper<User> wrapper = new QueryWrapper<User>();
        wrapper.notLike("userName", "z").likeLeft("userName", "i");
        // List users = userMapper.selectList(wrapper);
        List<Map<String, Object>> map = userMapper.selectMaps(wrapper);
        map.forEach(System.out::println);
    }

// inSql 语句
    @Test
    void test4(){
        QueryWrapper<User> wrapper = new QueryWrapper<User>();
        wrapper.inSql("id", "select id from m_user where id = 4");
        // SELECT all
        // FROM m_user WHERE deleted=0 AND (id IN (select id from m_user where id = 4))
        List<Object> objects = userMapper.selectObjs(wrapper);
        objects.forEach(System.out::println);
    }

// orderByAsc 语句
    @Test
    void test5(){
        QueryWrapper<User> wrapper = new QueryWrapper<User>();
        wrapper.orderByAsc("id");
        List<User> users = userMapper.selectList(wrapper);
        users.forEach(System.out::println);
    }

四、代码自动生成器

1. 狂神版

package com.kuang;
import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
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.po.TableFill;
import com.baomidou.mybatisplus.generator.config.rules.DateType;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import java.util.ArrayList;
// 代码自动生成器
public class KuangCode {
    public static void main(String[] args) {
// 需要构建一个 代码自动生成器 对象
        AutoGenerator mpg = new AutoGenerator();
// 配置策略
// 1、全局配置
        GlobalConfig gc = new GlobalConfig();
        String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath+"/src/main/java");
        gc.setAuthor("狂神说");
        gc.setOpen(false);
        gc.setFileOverride(false); // 是否覆盖
        gc.setServiceName("%sService"); // 去Service的I前缀
        gc.setIdType(IdType.ID_WORKER);
        gc.setDateType(DateType.ONLY_DATE);
        gc.setSwagger2(true);
        mpg.setGlobalConfig(gc);
//2、设置数据源
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl("jdbc:mysql://localhost:3306/kuang_community?"+
                "useSSL=false&useUnicode=true&characterEncoding=utf-8&"+
                "serverTimezone=GMT%2B8");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("root");
        dsc.setPassword("123456");
        dsc.setDbType(DbType.MYSQL);
        mpg.setDataSource(dsc);
//3、包的配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName("blog");
        pc.setParent("com.kuang");
        pc.setEntity("entity");
        pc.setMapper("mapper");
        pc.setService("service");
        pc.setController("controller");
        mpg.setPackageInfo(pc);
//4、策略配置
        StrategyConfig strategy = new StrategyConfig();
        strategy.setInclude("blog_tags","course","links","sys_settings","user_record","user_say"); // 设置要映射的表名
                strategy.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setEntityLombokModel(true); // 自动lombok；
        strategy.setLogicDeleteFieldName("deleted");
// 自动填充配置
        TableFill gmtCreate = new TableFill("gmt_create", FieldFill.INSERT);
        TableFill gmtModified = new TableFill("gmt_modified",
                FieldFill.INSERT_UPDATE);
        ArrayList<TableFill> tableFills = new ArrayList<>();
        tableFills.add(gmtCreate);
        tableFills.add(gmtModified);
        strategy.setTableFillList(tableFills);
// 乐观锁
        strategy.setVersionFieldName("version");
        strategy.setRestControllerStyle(true);
        strategy.setControllerMappingHyphenStyle(true); //localhost:8080/hello_id_2
        mpg.setStrategy(strategy);
        mpg.execute(); //执行
    }
}

2. 自用版

package com.wang;

import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
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.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;

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

// 演示例子，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 {

    /**
     * 

     * 读取控制台内容
     * 
     */
    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();
        final String projectPath = System.getProperty("user.dir");
        gc.setOutputDir(projectPath + "/src/main/java");
        // gc.setOutputDir("D:\\test");
        gc.setAuthor("关注公众号：MarkerHub");
        gc.setOpen(false);
        // gc.setSwagger2(true); 实体属性 Swagger2 注解
        gc.setServiceName("%sService");
        mpg.setGlobalConfig(gc);

        // 数据源配置
        DataSourceConfig dsc = new DataSourceConfig();
        dsc.setUrl(
                "jdbc:mysql://124.223.205.209:3306/vueblog?" + 
                "useUnicode=true&useSSL=false&characterEncoding=utf8"+
                "&serverTimezone=UTC");
        // dsc.setSchemaName("public");
        dsc.setDriverName("com.mysql.cj.jdbc.Driver");
        dsc.setUsername("3062827964");
        dsc.setPassword("Q3062827964q");
        mpg.setDataSource(dsc);

        // 包配置
        PackageConfig pc = new PackageConfig();
        pc.setModuleName(null);
        pc.setParent("com.wang");
        mpg.setPackageInfo(pc);

        // 自定义配置
        InjectionConfig cfg = new InjectionConfig() {
            @Override
            public void initMap() {
                // to do nothing
            }
        };

        // 如果模板引擎是 freemarker
        String templatePath = "/templates/mapper.xml.ftl";
        // 如果模板引擎是 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/"
                        + "/" + 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.setNaming(NamingStrategy.underline_to_camel);
        strategy.setColumnNaming(NamingStrategy.underline_to_camel);
        strategy.setEntityLombokModel(true);
        strategy.setRestControllerStyle(true);
        strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
        strategy.setControllerMappingHyphenStyle(true);
        strategy.setTablePrefix("m_");
        mpg.setStrategy(strategy);
        mpg.setTemplateEngine(new FreemarkerTemplateEngine());
        mpg.execute();
    }
}

五、pdf 连接