今天我们一起学习下SpringBoot+Mybatis-Plus五步实现分页查询!
第一步:创建好SpringBoot项目后先配置maven依赖(完整pom如下)
注意:1.启动类上要加注解@MapperScan("com.zk.*.mapper") // 扫码mapper类,把bean加入到spring容器管理
2..pom中resources配置不可缺少
<?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 https://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>2.5.4</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.zk</groupId> <artifactId>mybatisplus</artifactId> <version>0.0.1-SNAPSHOT</version> <name>mybatisplus</name> <description>Demo project for Spring Boot</description> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <!--<dependency>--> <!--<groupId>org.springframework.boot</groupId>--> <!--<artifactId>spring-boot-starter-test</artifactId>--> <!--<scope>test</scope>--> <!--</dependency>--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <optional>true</optional> </dependency> <!-- 这是mybatis-plus依赖 --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.1.1</version> </dependency> <!-- 这是mybatis-plus的代码自动生成器 --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-generator</artifactId> <version>3.1.1</version> </dependency> <!-- 这是模板引擎依赖 不可缺少--> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.30</version> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> <!-- 打包时去除test测试类 --> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <configuration> <skip>true</skip> </configuration> </plugin> </plugins> <resources> <!--自动生成时候generate插件找到包,使用mybatis generator插件生成代码时先注掉--> <resource> <directory>lib</directory> <targetPath>BOOT-INF/lib/</targetPath> <includes> <include>**/*.jar</include> </includes> </resource> <!-- maven项目中src源代码下的xml等资源文件编译进classes文件夹,注意:如果没有这个,它会自动搜索resources下是否有mapper.xml文件, 如果没有就会报org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): 很重要 --> <resource> <directory>src/main/java</directory> <includes> <include>**/*.xml</include> </includes> </resource> <!-- 把resources下的文件编译进classes文件夹 --> <resource> <directory>src/main/resources</directory> <includes> <include>**/*.*</include> </includes> <filtering>false</filtering> </resource> </resources> </build> </project>
第二步:在application.yml添加mybatis-plus配置
#mybatis: # mapper-locations: classpath:com/mapper/xml/*.xml #注意:一定要对应mapper映射xml文件的所在路径 # type-aliases-package: com.model # 注意:对应实体类的路径 # configuration: #打印sql # log-impl: org.apache.ibatis.logging.stdout.StdOutImpl mybatis-plus: configuration: map-underscore-to-camel-case: true auto-mapping-behavior: full log-impl: org.apache.ibatis.logging.stdout.StdOutImpl mapper-locations: classpath*:com/zk/mybatisplus/**/*Mapper.xml global-config: # 关闭MP3.0自带的banner banner: false # 逻辑删除配置 db-config: # 删除前 logic-not-delete-value: 1 # 删除后 logic-delete-value: 0
第三步:需要配置一下分页插件
package com.zk.mybatisplus.config; import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class MybatisPlusConfig { /** * 分页插件 */ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); } }
第四步:接下来就需要配置mybatis-plus的代码生成器了
package com.zk.mybatisplus.config; 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.DateType; 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; /** * 代码生成器 */ public class GeneratorCodeConfig { 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 + "/src/main/java"); gc.setAuthor("zk"); gc.setOpen(false); //实体属性 Swagger2 注解 gc.setSwagger2(false); gc.setFileOverride(true);//是否覆盖 gc.setActiveRecord(true); gc.setEnableCache(false);// XML 二级缓存 gc.setBaseResultMap(true);// XML中的ResultMap标签 gc.setBaseColumnList(false);// XML标签 gc.setIdType(IdType.AUTO); //主键策略 gc.setDateType(DateType.ONLY_DATE); // 自定义文件命名,注意 %s 会自动填充表实体属性! gc.setControllerName("%sController"); gc.setServiceName("%sService"); gc.setServiceImplName("%sServiceImpl"); gc.setMapperName("%sMapper"); mpg.setGlobalConfig(gc); // 数据源配置 DataSourceConfig dsc = new DataSourceConfig(); dsc.setUrl("jdbc:mysql://localhost:3306/user"); dsc.setDriverName("com.mysql.cj.jdbc.Driver"); dsc.setUsername("root"); dsc.setPassword("123456"); mpg.setDataSource(dsc); // 包配置 PackageConfig pc = new PackageConfig(); // pc.setModuleName(scanner("自定义包名")); pc.setParent("com"); pc.setController("zk.mybatisplus.controller"); pc.setEntity("zk.mybatisplus.model"); pc.setMapper("zk.mybatisplus.mapper"); pc.setService("zk.mybatisplus.service"); pc.setServiceImpl("zk.mybatisplus.service.impl"); pc.setXml("zk.mybatisplus.mapper.xml"); 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/java/com/zk/mybatisplus/mapper/xml" + "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML; } }); System.out.println( pc.getModuleName()); /* cfg.setFileCreate(new IFileCreate() { @Override public boolean isCreate(ConfigBuilder configBuilder, FileType fileType, String filePath) { // 判断自定义文件夹是否需要创建 checkDir("调用默认方法创建的目录"); return false; } }); */ cfg.setFileOutConfigList(focList); mpg.setCfg(cfg); // 配置模板 TemplateConfig templateConfig = new TemplateConfig(); // 配置自定义输出模板 //指定自定义模板路径,注意不要带上.ftl/.vm, 会根据使用的模板引擎自动识别 // templateConfig.setEntity("templates/entity2.java"); // templateConfig.setService(); // templateConfig.setController(); 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("com.baomidou.mybatisplus.extension.activerecord.Model"); strategy.setEntityLombokModel(true); strategy.setRestControllerStyle(true); strategy.setEntityLombokModel(true); // 公共父类 // strategy.setSuperControllerClass("com.baomidou.ant.common.BaseController"); // 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(); } }
运行之后就会出现所有需要的文件了。
如果报错Exception in thread “main” java.lang.NoClassDefFoundError: freemarker/template/Configuration
问题可能原因:使用spring-boot-starter-test依赖
解决方案:1.注释掉spring-boot-starter-test依赖
2.复制此配置类到test目录运行
第五步:在controller里面写方法进行测试
@RestController @RequestMapping("/role") public class TTenantRoleController { @Resource private ITTenantRoleService service; @RequestMapping(value = "/findAll",method = RequestMethod.POST) public Object findAll(HttpServletRequest request){ //获取前台发送过来的数据 Integer pageNo = Integer.valueOf(request.getParameter("pageNo")); Integer pageSize = Integer.valueOf(request.getParameter("pageSize")); IPage<TTenantRole> page = new Page<>(pageNo, pageSize); QueryWrapper<TTenantRole> wrapper = new QueryWrapper<>(); TTenantRole student = new TTenantRole(); // student.setId(2); wrapper.setEntity(student); return service.page(page,wrapper); } }
实现的效果为:
github地址:https://github.com/zhangkundamowang/MybatisPlus
代码已经提交到github上了,有兴趣的小伙伴可以研究一下~