MybatisPlus搭建项目环境及分页插件
一、搭建项目环境
1.1 创建项目
1.2 配置环境
导入分页依赖
<!--用于生存代码--> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <version>3.4.1</version> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.31</version> </dependency>
修改MySQL的版本
1.1.1 自动生成代码
首先在resources下创建项目mappers
修改application.yml
server: port: 8080 spring: application: name: springbootxm datasource: driver-class-name: com.mysql.jdbc.Driver name: defaultDataSource password: 123456 url: jdbc:mysql://localhost:3306/y101?useUnicode=true&characterEncoding=UTF-8 username: root freemarker: cache: false charset: utf-8 expose-request-attributes: true expose-session-attributes: true suffix: .ftl template-loader-path: classpath:/templates/ # resources: # static-locations: classpath:/static/# 应用服务 WEB 访问端口 mvc: static-path-pattern: /static/** #打印SQL语句 logging: level: com.xlb.springbootassets: debug #配置映射 mybatis-plus: mapper-locations: classpath:mappers/**/*.xml type-aliases-package: com.xlb.springbootxm.bj.model
引入生成代码类
MPGenerator
package com.xlb.springbootxm.mp; import com.baomidou.mybatisplus.annotation.DbType; import com.baomidou.mybatisplus.annotation.IdType; 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; /** * mybatis-plus代码生成 */ public class MPGenerator { /** * <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.isNotBlank(ipt)) { if ("quit".equals(ipt)) return ""; 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(); // 1.全局配置 GlobalConfig gc = new GlobalConfig(); //System.getProperty("user.dir")指工作区间 如我们工作期间名是iderr String projectPath = System.getProperty("user.dir") + "/springbootxm"; System.out.println(projectPath); gc.setOutputDir(projectPath + "/src/main/java"); gc.setOpen(false); gc.setBaseResultMap(true);//生成BaseResultMap gc.setActiveRecord(false);// 不需要ActiveRecord特性的请改为false gc.setEnableCache(false);// XML 二级缓存 gc.setBaseResultMap(true);// XML ResultMap gc.setBaseColumnList(true);// XML columList //gc.setSwagger2(true); //实体属性 Swagger2 注解 gc.setAuthor("小谢"); // 自定义文件命名,注意 %s 会自动填充表实体属性! gc.setMapperName("%sMapper"); gc.setXmlName("%sMapper"); gc.setServiceName("%sService"); gc.setServiceImplName("%sServiceImpl"); gc.setControllerName("%sController"); gc.setIdType(IdType.AUTO); mpg.setGlobalConfig(gc); // 2.数据源配置 DataSourceConfig dsc = new DataSourceConfig(); dsc.setDbType(DbType.MYSQL); dsc.setUrl("jdbc:mysql://localhost:3306/y101?useUnicode=true&characterEncoding=UTF-8"); dsc.setDriverName("com.mysql.jdbc.Driver"); dsc.setUsername("root"); dsc.setPassword("123456"); mpg.setDataSource(dsc); // 3.包配置 PackageConfig pc = new PackageConfig(); String moduleName = scanner("模块名(quit退出,表示没有模块名)"); if (StringUtils.isNotBlank(moduleName)) { pc.setModuleName(moduleName); } //设置父包 pc.setParent("com.xlb.springbootxm") .setMapper("mapper") .setService("service") .setController("controller") .setEntity("model"); mpg.setPackageInfo(pc); // 4.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"; // 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!! if (StringUtils.isNotBlank(pc.getModuleName())) { return projectPath + "/src/main/resources/mappers/" + pc.getModuleName() + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML; } else { return projectPath + "/src/main/resources/mappers/" + 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); // 5.策略配置 StrategyConfig strategy = new StrategyConfig(); // 表名生成策略(下划线转驼峰命名) strategy.setNaming(NamingStrategy.underline_to_camel); // 列名生成策略(下划线转驼峰命名) strategy.setColumnNaming(NamingStrategy.underline_to_camel); // 是否启动Lombok配置 strategy.setEntityLombokModel(true); // 是否启动REST风格配置 strategy.setRestControllerStyle(true); // 自定义实体父类strategy.setSuperEntityClass("com.baomidou.mybatisplus.extension.activerecord.Model"); // 自定义service父接口strategy.setSuperServiceClass("com.baomidou.mybatisplus.extension.service.IService"); // 自定义service实现类strategy.setSuperServiceImplClass("com.baomidou.mybatisplus.extension.service.impl.ServiceImpl"); // 自定义mapper接口strategy.setSuperMapperClass("com.baomidou.mybatisplus.core.mapper.BaseMapper"); strategy.setSuperEntityColumns("id"); // 写于父类中的公共字段plus strategy.setSuperEntityColumns("id"); strategy.setInclude(scanner("表名,多个英文逗号分割").split(",")); strategy.setControllerMappingHyphenStyle(true); //表名前缀(可变参数):“t_”或”“t_模块名”,例如:t_user或t_sys_user strategy.setTablePrefix("t_", "t_sys_"); //strategy.setTablePrefix(scanner("请输入表前缀")); mpg.setStrategy(strategy); mpg.setTemplateEngine(new FreemarkerTemplateEngine()); // 执行 mpg.execute(); } }
运行生成代码
1.1.2 配置SpringbootassetsApplication
SpringbootassetsApplication
package com.xlb.springbootxm; import org.mybatis.spring.annotation.MapperScan; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.transaction.annotation.EnableTransactionManagement; //完成对mapper接口的扫描 @MapperScan("com.xlb.springbootxm.bj.mapper") //开启事务管理 @EnableTransactionManagement @SpringBootApplication public class SpringbootxmApplication { public static void main(String[] args) { SpringApplication.run(SpringbootxmApplication.class, args); } }
1.3 配置application.yml
server: port: 8080 spring: application: name: springbootxm datasource: driver-class-name: com.mysql.jdbc.Driver name: defaultDataSource password: 123456 url: jdbc:mysql://localhost:3306/y101?useUnicode=true&characterEncoding=UTF-8 username: root freemarker: cache: false charset: utf-8 expose-request-attributes: true expose-session-attributes: true suffix: .ftl # template-loader-path: classpath:/templates/ # resources: # static-locations: classpath:/static/# 应用服务 WEB 访问端口 mvc: static-path-pattern: /static/** #打印SQL语句 logging: level: com.xlb.springbootassets: debug #配置映射 mybatis-plus: mapper-locations: classpath:mappers/**/*.xml type-aliases-package: com.xlb.springbootxm.bj.model
1.4 编写controller层
因为自动生成代码注解是==@RestController==,等价于@Controller + @ResponseBody。但是@ResponseBody表示方法的返回值直接以指定的格式写入Http response body中,而不是解析为跳转路径。所以我们要把注解改为==@Controller==
StrutsClassController
package com.xlb.springbootmp.book.controller; import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper; import com.xlb.springbootmp.book.model.MvcBook; import com.xlb.springbootmp.book.service.MvcBookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.HashMap; import java.util.List; import java.util.Map; /** * <p> * 前端控制器 * </p> * * @author lky * @since 2022-11-01 */ @Controller @RequestMapping("/book") public class MvcBookController { @Autowired private MvcBookService mvcBookService; //查询单个 @GetMapping("/list") public List<MvcBook> list(){ return mvcBookService.list(); } //按条件查询 @GetMapping("/listByCondition") public List<MvcBook> listByCondition(MvcBook mvcBook){ QueryWrapper qw = new QueryWrapper(); //key代表数据库自段 value代表查询的值 like代表模糊查询 qw.like("bname", mvcBook.getBname()); return mvcBookService.list(qw); } //查询单个 @GetMapping("/get") public MvcBook get(MvcBook mvcBook){ return mvcBookService.getById(mvcBook.getBid()); } //增加 @PutMapping("/add") public boolean add(MvcBook mvcBook){ boolean save = mvcBookService.save(mvcBook); return save; } //删除 @DeleteMapping("/del") public boolean del(MvcBook mvcBook){ return mvcBookService.removeById(mvcBook.getBid()); } //修改 @PostMapping("/edit") public boolean edit(MvcBook mvcBook){ return mvcBookService.saveOrUpdate(mvcBook); } // 连表查询 @GetMapping("/userRole") public List<Map> userRole(String uname){ Map map = new HashMap(); map.put("username",uname); List<Map> maps = mvcBookService.queryUserRole(map); return maps; } }
1.5 编写前台代码
目录
headd.ftl
<#--局部变量--> <#assign ctx> ${springMacroRequestContext.contextPath} </#assign> <#--全局变量--> <#global ctx2> ${springMacroRequestContext.contextPath} </#global>
clzEdit.ftl
<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>博客的编辑界面</title> </head> <body> <#include '/headd.ftl' /> <#if b??> <#-- 修改--> <form action="${ctx }/clz/edit"> cname:<input type="text" name="cname" value="${b.cname !}"> cteacher:<input type="text" name="cteacher" value="${b.cteacher !}"> pic:<input type="text" name="pic" value="${b.pic !}"> <input type="submit"> </form> <#else> <#-- 新增 --> <form action="${ctx }/clz/add" method="post"> cname:<input type="text" name="cname" value=""> cteacher:<input type="text" name="cteacher" value=""> pic:<input type="text" name="pic" value=""> <input type="submit"> </form> </#if> </body> </html>
clzList.ftl
<!DOCTYPE html> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <link href="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.css" rel="stylesheet"> <script src="https://cdn.bootcdn.net/ajax/libs/twitter-bootstrap/4.5.0/js/bootstrap.js"></script> <title>博客列表</title> <style type="text/css"> .page-item input { padding: 0; width: 40px; height: 100%; text-align: center; margin: 0 6px; } .page-item input, .page-item b { line-height: 38px; float: left; font-weight: 400; } .page-item.go-input { margin: 0 10px; } </style> </head> <body> <#include '/headd.ftl' /> <#-- 查询条件框 --> <form class="form-inline" action="${ctx}/clz/list" method="post"> <div class="form-group mb-2"> <input type="text" class="form-control-plaintext" name="cname" placeholder="请输入班级名称"> </div> <button type="submit" class="btn btn-primary mb-2">查询</button> <a class="btn btn-primary mb-2" href="${ctx}/clz/toEdit">新增</a> </form> <table class="table table-striped bg-success"> <thead> <tr> <th scope="col">ID</th> <th scope="col">班级名称</th> <th scope="col">指导老师</th> <th scope="col">班级相册</th> <th scope="col">操作</th> </tr> </thead> <tbody> <#list lst as b> <tr> <td>${b.cid !}</td> <td>${b.cname !}</td> <td>${b.cteacher !}</td> <td>${b.pic !}</td> <td> <a href="${ctx }/clz/toEdit?cid=${b.cid}">修改</a> <a href="${ctx }/clz/del?cid=${b.cid}">删除</a> </td> </tr> </#list> </tbody> </table> </body> </html>
1.6 测试
1.6.1 查询
1.6.2 新增
1.6.3 修改
1.6.4 删除
二、MyBatis-Plus分页插件
2.1 创建插件配置类
MybatisPlusConfig
package com.xlb.springbootassets.bj.config; import com.baomidou.mybatisplus.annotation.DbType; import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor; import com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class MybatisPlusConfig { /** * 分页插件配置 * * @return */ //从MyBatis-Plus 3.4.0开始,不再使用旧版本的PaginationInterceptor ,而是使用MybatisPlusInterceptor。 //使用分页插件需要配置MybatisPlusInterceptor,将分页拦截器添加进来: @Bean public MybatisPlusInterceptor mybatisPlusInterceptor() { MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor(); // 向MyBatis-Plus的过滤器链中添加分页拦截器,需要设置数据库类型(主要用于分页方言) interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL)); return interceptor; } }
2.2 编写SQL
StrutsClassMapper.xml
<select id="selectPageVo" resultType="com.xlb.springbootassets.bj.model.StrutsClass"> select cid,cname,cteacher,pic FROM t_struts_class WHERE cname=#{cname} </select>
2.3 mapper层
//亲测这里最前面使用Ipage和Page是一样的,如果这里使用的是Page,下面也要改。但是还是推荐官网上面的Ipage,不改最好。 IPage<StrutsClass> selectPageVo(Page<StrutsClass> page,String clazz);
2.4 service层
StrutsClassService
//分页方法 IPage<StrutsClass> selectPageVo(Page<StrutsClass> page,String clazz);
StrutsClassServiceImpl
@Override public IPage<StrutsClass> selectPageVo(Page<StrutsClass> page,String clazz) { return strutsClassMapper.selectPageVo(page,clazz); }
2.5 controller 层
//分页方法 @RequestMapping("/pagelist") public IPage<StrutsClass> pagelist(@RequestBody String clazz){ Page<StrutsClass> page1 = new Page<>(); Page<StrutsClass> page = new Page<>(1,10); return strutsClassService.selectPageVo(page,clazz); }
总结
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