簡介
這一篇我們講解如何在springboot下整合mybatis-plus，並訪問數據庫。 MyBatis-Plus（簡稱 MP）是一個 MyBatis 的增強工具，在 MyBatis 的基礎上只做增強不做改變，為簡化開發、提高效率而生。 對於 mybatis-plus 的使用，可以參照官網http://mp.baomidou.com/，這裡我就不講解了。
一、創建數據庫表
<code>DROP TABLE IF EXISTS `tb_employee`;CREATE TABLE `tb_employee` ( `id` int(11) NOT NULL AUTO_INCREMENT, `lastName` varchar(255) DEFAULT NULL, `email` varchar(255) DEFAULT NULL, `gender` int(2) DEFAULT NULL, `d_id` int(11) DEFAULT NULL, PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;/<code>
二、創建項目
創建一個項目springboot-mybatis
1、pom.xml
<code><project> <modelversion>4.0.0/<modelversion> <groupid>com.gf/<groupid> <artifactid>springboot-mybatis/<artifactid> <version>0.0.1-SNAPSHOT/<version> <packaging>jar/<packaging> <name>springboot-mybatis/<name> <description>Demo project for Spring Boot/<description> <parent> <groupid>org.springframework.boot/<groupid> <artifactid>spring-boot-starter-parent/<artifactid> <version>2.1.0.RELEASE/<version> <relativepath> /<parent> <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> <dependency> <groupid>org.springframework.boot/<groupid> <artifactid>spring-boot-starter-web/<artifactid> /<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> <dependency> <groupid>com.baomidou/<groupid> <artifactid>mybatis-plus-boot-starter/<artifactid> <version>3.0.1/<version> /<dependency> <dependency> <groupid>org.apache.velocity/<groupid> <artifactid>velocity/<artifactid> <version>1.7/<version> /<dependency> <dependency> <groupid>org.springframework.boot/<groupid> <artifactid>spring-boot-starter-test/<artifactid> <scope>test/<scope> /<dependency> /<dependencies> <build> <plugins> <plugin> <groupid>org.springframework.boot/<groupid> <artifactid>spring-boot-maven-plugin/<artifactid> /<plugin> /<plugins> /<build>/<project>/<code>
2. 代碼生成器
AutoGenerator 是 MyBatis-Plus 的代碼生成器，通過 AutoGenerator 可以快速生成 Entity、Mapper、Mapper XML、Service、Controller 等各個模塊的代碼，極大的提升了開發效率。
1. mapper.xml.vm
在resources/templates 下創建 Mapper XML的生成模板
<code><mapper>#if(${enableCache}) <cache>#end#if(${baseResultMap}) <resultmap>#foreach($field in ${table.fields})#if(${field.keyFlag})##生成主鍵排在第一位 #foreach($field in ${table.commonFields}) ${field.name},#end ${table.fieldNames} #end/<mapper>/<code>2. CodeGenerator
<code>package com.gf.config;import com.baomidou.mybatisplus.annotation.DbType;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.DataSourceConfig;import com.baomidou.mybatisplus.generator.config.FileOutConfig;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.TemplateConfig;import com.baomidou.mybatisplus.generator.config.po.TableInfo;import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;import java.util.ArrayList;import java.util.List;public class CodeGenerator { public static void main(String[] args) throws InterruptedException { 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.setFileOverride(true); gc.setActiveRecord(true); gc.setEnableCache(false);// XML 二級緩存 gc.setBaseResultMap(true);// XML ResultMap gc.setBaseColumnList(true);// XML columList gc.setOpen(false); gc.setAuthor("gf"); // 自定義文件命名，注意 %s 會自動填充表實體屬性！ gc.setMapperName("%sMapper"); gc.setXmlName("%sMapper"); gc.setServiceName("%sService"); gc.setServiceImplName("%sServiceImpl"); gc.setControllerName("%sController"); mpg.setGlobalConfig(gc); // 數據源配置 DataSourceConfig dsc = new DataSourceConfig(); dsc.setDbType( DbType.MYSQL); dsc.setDriverName("com.mysql.jdbc.Driver"); dsc.setUrl("jdbc:mysql://127.0.0.1:3306/test?useSSL=false"); dsc.setUsername("xxxxxx"); dsc.setPassword("xxxxxx"); mpg.setDataSource(dsc); // 包配置 PackageConfig pc = new PackageConfig(); pc.setParent("com.gf"); pc.setController( "controller"); pc.setEntity( "entity" ); //pc.setModuleName("test"); mpg.setPackageInfo(pc); // 自定義配置 InjectionConfig cfg = new InjectionConfig() { @Override public void initMap() { // to do nothing } }; List<fileoutconfig> focList = new ArrayList<>(); focList.add(new FileOutConfig("/templates/mapper.xml.vm") { @Override public String outputFile(TableInfo tableInfo) { // 自定義輸入文件名稱 return projectPath + "/src/main/resources/mapper/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML; } }); cfg.setFileOutConfigList(focList); mpg.setCfg(cfg); mpg.setTemplate(new TemplateConfig().setXml(null)); // 策略配置 StrategyConfig strategy = new StrategyConfig(); //此處可以修改為您的表前綴 strategy.setTablePrefix(new String[] { "tb_"}); // 表名生成策略 strategy.setNaming(NamingStrategy.underline_to_camel); // 需要生成的表 strategy.setInclude(new String[] { "tb_employee" }); // 排除生成的表 //strategy.setExclude(new String[]{"test"}); strategy.setEntityLombokModel( true ); mpg.setStrategy(strategy); // 執行生成 mpg.execute(); }}/<fileoutconfig>/<code> 我運行 CodeGenerator 會發現，我麼需要的 entity、mapper、service、controller 都有了，而且mybatis-plus 為我們封裝了很對常用的方法 ，大大的提到了我們的開發效率
3. application.properties
<code>spring.datasource.url=jdbc:mysql://localhost:3306/testspring.datasource.username=xxxxxxspring.datasource.password=xxxxxxspring.datasource.driver-class-name=com.mysql.jdbc.Driver/<code>
4. EmployeeController
<code>@RestController@RequestMapping("/employee")public class EmployeeController { @Autowired EmployeeService employeeService; @RequestMapping(value = "/list", method = RequestMethod.GET) public List<employee> getEmployees() { return employeeService.list( null ); } @RequestMapping(value = "/{id}", method = RequestMethod.GET) public Employee getEmployeeById(@PathVariable("id") int id) { return employeeService.getById( id ); } @RequestMapping(value = "/{id}", method = RequestMethod.PUT) public String updateEmployee(@PathVariable("id") int id, @RequestParam(value = "lastName", required = true) String lastName, @RequestParam(value = "email", required = true) String email , @RequestParam(value = "gender", required = true) int gender , @RequestParam(value = "dId", required = true) int dId) { Employee employee = new Employee(); employee.setId( id ); employee.setLastName( "張" ); employee.setEmail( "[email protected]" ); employee.setGender( 1 ); employee.setDId( 1 ); boolean b = employeeService.updateById( employee ); if (b) { return "update success"; } else { return "update fail"; } } @RequestMapping(value = "/{id}", method = RequestMethod.DELETE) public String delete(@PathVariable(value = "id")int id) { boolean b = employeeService.removeById( id ); if(b) { return "delete success"; }else { return "delete fail"; } } @RequestMapping(value = "", method = RequestMethod.POST) public String postEmployee(@RequestParam(value = "lastName", required = true) String lastName, @RequestParam(value = "email", required = true) String email , @RequestParam(value = "gender", required = true) int gender , @RequestParam(value = "dId", required = true) int dId) { Employee employee = new Employee(); employee.setLastName( "王" ); employee.setEmail( "[email protected]" ); employee.setGender( 2 ); employee.setDId( 2 ); boolean b = employeeService.save( employee ); if(b) { return "sava success"; }else { return "sava fail"; } }}/<employee>/<code>源碼下載：https://github.com/gf-huanchupk/SpringBootLearning
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