spring|spring boot + mybatis plus springboot+mybatisplus

1.spring boot 环境搭建 1.添加mven依赖包

mysql mysql-connector-java runtime org.projectlombok lombok true com.baomidou mybatis-plus-boot-starter 3.4.0 junit junit com.baomidou mybatis-plus-generator 3.4.0 org.springframework.boot spring-boot-starter-freemarker org.springframework.boot spring-boot-starter-web

2.添加 application.yml 配置(resources 目录下)

spring: datasource: url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=GMT%2B8 username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver#Servlet容器配置 server: port: 80 servlet: context-path: /index#配置日志 logging: level: root: warn com.zimug.boot.launch.mapper: trace

2.mybatis-plus 环境搭建 【spring|spring boot + mybatis plus】添加mapper 扫描注:@MapperScan("自己mapper的路径地址")

@SpringBootApplication @MapperScan("com.example.my.app.user.mapper") public class MyApplication {public static void main(String[] args) { SpringApplication.run(MyApplication.class, args); }}

(1).添加

Mapper.insert(bean);

(2).修改

Bean user2 = Mapper.selectById(1); user2.setTitle("test"); int result = Mapper.updateById(user2);

(3).删除

//更据id进行删除 int rows = userMapper.deleteById(1); System.out.println("影响记录数：" + rows); //构造条件 Map map = new HashMap<>(); map.put("name","字母哥"); map.put("age",18); //执行删除 int rows = userMapper.deleteByMap(map); System.out.println("影响记录数：" + rows);

(4).查询

//根据主键查询一条数据 User user = userMapper.selectById(1); System.out.println(user); //根据ids批量查找数据 List ids = Arrays.asList( 1, 2, 3 ); List list = userMapper.selectBatchIds(ids); list.forEach(System.out::println);

3.mybatis-plus 代码自动生成器

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; /** * 此类为mybatis-plus的数据库表模板生成器 */ public class CodeGenerator { public static final String package_name = "com.example.my.app"; //设置生成代码路径 public static final String super_controller = "com.example.my.base.BaseController"; //你自己的父类实体,没有就不用设置! public static final String super_entity = "com.example.my.base.BaseEntity"; //"你自己的父类实体,没有就不用设置!"public static void main(String[] args) { // 代码生成器 AutoGenerator mpg = new AutoGenerator(); String projectPath = System.getProperty("user.dir"); /*全局配置 GlobalConfig*/ GlobalConfig globalConfig = new GlobalConfig(); globalConfig.setOutputDir(System.getProperty("user.dir") + "/src/main/java"); globalConfig.setAuthor("jobob"); globalConfig.setOpen(false); mpg.setGlobalConfig(globalConfig); /*数据源配置 DataSourceConfig*/ DataSourceConfig dataSourceConfig = new DataSourceConfig(); dataSourceConfig.setUrl("jdbc:mysql://localhost:3306/test?useUnicode=true&useSSL=false&characterEncoding=utf8"); dataSourceConfig.setDriverName("com.mysql.cj.jdbc.Driver"); dataSourceConfig.setUsername("root"); dataSourceConfig.setPassword("root"); mpg.setDataSource(dataSourceConfig); // 包配置 PackageConfig pc = new PackageConfig(); pc.setModuleName(scanner("模块名")); pc.setParent(package_name); /*设置引入的包*/ mpg.setPackageInfo(pc); // 自定义配置 InjectionConfig cfg = new InjectionConfig() { @Override public void initMap() { // 什么都不做 } }; // 如果模板引擎是 freemarker String templatePath = "/templates/mapper.xml.ftl"; // 自定义输出配置 List 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/" + pc.getModuleName() + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML; } }); cfg.setFileOutConfigList(focList); /*设置文件输出配置列表*/ mpg.setCfg(cfg); // 配置模板最重要的一步 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.setSuperEntityClass(super_entity); strategy.setEntityLombokModel(true); strategy.setRestControllerStyle(true); // 公共父类 strategy.setSuperControllerClass(super_controller); // 写于父类中的公共字段 strategy.setSuperEntityColumns("id"); strategy.setInclude(scanner("表名，多个英文逗号分割").split(",")); strategy.setControllerMappingHyphenStyle(true); strategy.setTablePrefix(pc.getModuleName() + "_"); mpg.setStrategy(strategy); mpg.setTemplateEngine(new FreemarkerTemplateEngine()); mpg.execute(); }/** * 读取控制台内容 */ public static String scanner(String tip) { Scanner scanner = new Scanner(System.in); System.out.println("请输入" + tip + "："); if (scanner.hasNext()) { String ipt = scanner.next(); if (StringUtils.isNotBlank(ipt)) { return ipt; } } throw new MybatisPlusException("请输入正确的" + tip + "！"); }}