Mybatis-Plus 搭建与使用 Mybatis-Plus 搭建与使用入门(小结)
殷天文 人气:0Mybatis-Plus(简称MP)是一个 Mybatis 的增强工具,在 Mybatis 的基础上只做增强不做改变,为简化开发、提高效率而生。
中文文档 :http://baomidou.oschina.io/mybatis-plus-doc/
本文介绍包括
1)如何搭建
2)代码生成(controller、service、mapper、xml)
3)单表的CRUD、条件查询、分页 基类已经为你做好了
一、如何搭建
1. 首先我们创建一个 springboot 工程 --> https://start.spring.io/
2. maven 依赖
<dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>2.3</version> </dependency> <!-- velocity 依赖,用于代码生成 --> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity-engine-core</artifactId> <version>2.0</version> </dependency>
3. 配置(因为感觉太啰嗦,这里省略了数据源的配置)
application.properties
mybatis-plus.mapper-locations=classpath:/mapper/*Mapper.xml mybatis-plus.typeAliasesPackage=com.taven.web.springbootmp.entity mybatis-plus.global-config.id-type=3 mybatis-plus.global-config.field-strategy=2 mybatis-plus.global-config.db-column-underline=true mybatis-plus.global-config.key-generator=com.baomidou.mybatisplus.incrementer.OracleKeyGenerator mybatis-plus.global-config.logic-delete-value=1 mybatis-plus.global-config.logic-not-delete-value=0 mybatis-plus.global-config.sql-injector=com.baomidou.mybatisplus.mapper.LogicSqlInjector #这里需要改成你的类 mybatis-plus.global-config.meta-object-handler=com.taven.web.springbootmp.MyMetaObjectHandler mybatis-plus.configuration.map-underscore-to-camel-case=true mybatis-plus.configuration.cache-enabled=false mybatis-plus.configuration.jdbc-type-for-null=null
配置类 MybatisPlusConfig
import org.mybatis.spring.annotation.MapperScan; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import com.baomidou.mybatisplus.incrementer.H2KeyGenerator; import com.baomidou.mybatisplus.incrementer.IKeyGenerator; import com.baomidou.mybatisplus.mapper.ISqlInjector; import com.baomidou.mybatisplus.mapper.LogicSqlInjector; import com.baomidou.mybatisplus.mapper.MetaObjectHandler; import com.baomidou.mybatisplus.plugins.PaginationInterceptor; import com.baomidou.mybatisplus.plugins.PerformanceInterceptor; import com.taven.web.springbootmp.MyMetaObjectHandler; @EnableTransactionManagement @Configuration @MapperScan("com.taven.web.springbootmp.mapper") public class MybatisPlusConfig { /** * mybatis-plus SQL执行效率插件【生产环境可以关闭】 */ @Bean public PerformanceInterceptor performanceInterceptor() { return new PerformanceInterceptor(); } /* * 分页插件,自动识别数据库类型 多租户,请参考官网【插件扩展】 */ @Bean public PaginationInterceptor paginationInterceptor() { return new PaginationInterceptor(); } @Bean public MetaObjectHandler metaObjectHandler() { return new MyMetaObjectHandler(); } /** * 注入主键生成器 */ @Bean public IKeyGenerator keyGenerator() { return new H2KeyGenerator(); } /** * 注入sql注入器 */ @Bean public ISqlInjector sqlInjector() { return new LogicSqlInjector(); } }
import com.baomidou.mybatisplus.mapper.MetaObjectHandler; import org.apache.ibatis.reflection.MetaObject; import org.slf4j.Logger; import org.slf4j.LoggerFactory; /** * 注入公共字段自动填充,任选注入方式即可 */ //@Component public class MyMetaObjectHandler extends MetaObjectHandler { protected final static Logger logger = LoggerFactory.getLogger(Application.class); @Override public void insertFill(MetaObject metaObject) { logger.info("新增的时候干点不可描述的事情"); } @Override public void updateFill(MetaObject metaObject) { logger.info("更新的时候干点不可描述的事情"); } }
二、代码生成
执行 junit 即可生成controller、service接口及实现、mapper及xml
import org.junit.Test; 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.rules.DbType; import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy; /** * <p> * 测试生成代码 * </p> * * @author K神 * @date 2017/12/18 */ public class GeneratorServiceEntity { @Test public void generateCode() { String packageName = "com.taven.web.springbootmp"; boolean serviceNameStartWithI = false;//user -> UserService, 设置成true: user -> IUserService generateByTables(serviceNameStartWithI, packageName, "cable", "station");//修改为你的表名 } private void generateByTables(boolean serviceNameStartWithI, String packageName, String... tableNames) { GlobalConfig config = new GlobalConfig(); String dbUrl = "jdbc:mysql://localhost:3306/communicate"; DataSourceConfig dataSourceConfig = new DataSourceConfig(); dataSourceConfig.setDbType(DbType.MYSQL) .setUrl(dbUrl) .setUsername("root") .setPassword("root") .setDriverName("com.mysql.jdbc.Driver"); StrategyConfig strategyConfig = new StrategyConfig(); strategyConfig .setCapitalMode(true) .setEntityLombokModel(false) .setDbColumnUnderline(true) .setNaming(NamingStrategy.underline_to_camel) .setInclude(tableNames);//修改替换成你需要的表名,多个表名传数组 config.setActiveRecord(false) .setEnableCache(false) .setAuthor("殷天文") .setOutputDir("E:\\dev\\stsdev\\spring-boot-mp\\src\\main\\java") .setFileOverride(true); if (!serviceNameStartWithI) { config.setServiceName("%sService"); } new AutoGenerator().setGlobalConfig(config) .setDataSource(dataSourceConfig) .setStrategy(strategyConfig) .setPackageInfo( new PackageConfig() .setParent(packageName) .setController("controller") .setEntity("entity") ).execute(); } // private void generateByTables(String packageName, String... tableNames) { // generateByTables(true, packageName, tableNames); // } }
到这一步搭建已经基本完成了,下面就可以开始使用了!
三、使用 Mybatis-Plus
首先我们执行 上面的 generateCode() 会为我们基于 表结构 生成以下代码(xml是我手动移到下面的),service 和 mapper 已经继承了基类,为我们封装了很多方法,下面看几个简单的例子。
/** * <p> * 前端控制器 * </p> * * @author 殷天文 * @since 2018-05-31 */ @Controller @RequestMapping("/cable") public class CableController { @Autowired private CableService cableService; /** * list 查询测试 * */ @RequestMapping("/1") @ResponseBody public Object test1() { // 构造实体对应的 EntityWrapper 对象,进行过滤查询 EntityWrapper<Cable> ew = new EntityWrapper<>(); ew.where("type={0}", 1) .like("name", "王") .and("core_number={0}", 24) .and("is_delete=0"); List<Cable> list = cableService.selectList(ew); List<Map<String, Object>> maps = cableService.selectMaps(ew); System.out.println(list); System.out.println(maps); return "ok"; } /** * 分页 查询测试 */ @RequestMapping("/2") @ResponseBody public Object test2() { // 构造实体对应的 EntityWrapper 对象,进行过滤查询 EntityWrapper<Cable> ew = new EntityWrapper<>(); ew.where("type={0}", 1) // .like("name", "王") .and("core_number={0}", 24) .and("is_delete=0"); Page<Cable> page = new Page<>(1,10); Page<Cable> pageRst = cableService.selectPage(page, ew); return pageRst; } /** * 自定义查询字段 */ @RequestMapping("/3") @ResponseBody public Object test3() { Object vl = null; // 构造实体对应的 EntityWrapper 对象,进行过滤查询 EntityWrapper<Cable> ew = new EntityWrapper<>(); ew.setSqlSelect("id, `name`, " + "case type\n" + "when 1 then '220kv'\n" + "end typeName") .where("type={0}", 1) // .like("name", "王") .where(false, "voltage_level=#{0}", vl);//当vl 为空时,不拼接 Page<Cable> page = new Page<>(1,10); Page<Cable> pageRst = cableService.selectPage(page, ew); return pageRst; } /** * insert */ @RequestMapping("/4") @ResponseBody public Object test4() { Cable c = new Cable(); c.setName("测试光缆"); cableService.insert(c); return "ok"; } /** * update */ @RequestMapping("/5") @ResponseBody public Object test5() { Cable c = cableService.selectById(22284l); c.setName("测试光缆2222"); c.setType(1); cableService.updateById(c); return "ok"; } }
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