mybatis 快速开发
在应用开发过程中，单表操作永远占据我们工作的一部分，初略估计我觉得大概应该占到40%或者更多，这些操作千篇一律，简单而且繁琐，DB增删字段，对于mapper.xml要做大量的修改，稍微不慎，bug百出。解决了这个问题我觉得工作效率会提升很多，因为以前我很厌烦数据库增删字段，然而现在这个问题已经不复存在，因为增删字段只需要修改同步增删实体类字段而已。
项目业务功能大概分Controller，service，serviceImpl，dao，mapper，entity，model这些层来处理，一般情况下通过mybatis generator生成dao，mapper，entity其中mapper已经写好了大量的配置文件，这些东西增删一个字段要修改好多地方，也就是说不动则已一动则很麻烦。而且不同工程师创建的service名不能知其意，往往同一功能被多人开发。
现在通过生成Controller之外的所有层，且生成的文件够干净，dao通过集成通用BaseDao<T>来扩展dao功能，service通过继承通用IService<T>来扩展service功能，让生成的类天生带有常用的功能，其他的和以前一样。
这样针对所有单表操作的功能实现都能得到封装，当我们使用的时候不用写Service层及以下层相关代码。但是事务问题不好处理，不过我们可以事务上移到controller层，这样做我不觉得有啥缺点，同时能够满足所有的要求。
相对mybatis依赖较少
<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 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.young4j</groupId> <artifactId>my_mybatis</artifactId> <version>1.0.0-SNAPSHOT</version> <packaging>war</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <spring.version>4.2.5.RELEASE</spring.version> <junit.version>4.12</junit.version> <druid.version>1.1.0</druid.version> <fastjson.version>1.2.8</fastjson.version> <mybaitsplus.version>2.1-gamma</mybaitsplus.version> <mysql.version>5.1.38</mysql.version> <log4j.version>1.2.17</log4j.version> <slf4j.version>1.7.19</slf4j.version> <aspectjweaver.version>1.8.8</aspectjweaver.version> <fileupload.version>1.3.1</fileupload.version> <velocity.version>1.7</velocity.version> <jstl.version>1.2</jstl.version> </properties> <dependencies> <!-- JUnit --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> <!-- Spring --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <!-- Spring MVC --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> <type>jar</type> <scope>compile</scope> </dependency> <!-- AOP --> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>${aspectjweaver.version}</version> </dependency> <!-- FileUpload --> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>${fileupload.version}</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>${jstl.version}</version> </dependency> <!-- Mybatis-Plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus</artifactId> <version>${mybaitsplus.version}</version> </dependency> <dependency> <groupId>org.apache.velocity</groupId> <artifactId>velocity</artifactId> <version>${velocity.version}</version> </dependency> <!-- Mysql --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>${mysql.version}</version> </dependency> <!-- Druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>${druid.version}</version> </dependency> <!-- FastJson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>${fastjson.version}</version> </dependency> <!-- Log --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>${log4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${slf4j.version}</version> </dependency> </dependencies> <build> <finalName>my_mybatis</finalName> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <configuration> <source>1.8</source> <target>1.8</target> </configuration> </plugin> </plugins> </build> </project>
分页就是如此简单
@RequestMapping("/testDb") public Object testDb(Integer id){ StringBuffer sb = new StringBuffer(); Lables lable = lablesService.selectById(id); log.info("selectById" + lable.toString()); sb.append(lable.toString()); List<Lables> lables =lablesService.selectList(new EntityWrapper<Lables>()); log.info("selectBatchIds" + lables.toString()); sb.append(lables); Page<Lables> page = lablesService.selectPage(new Page<Lables>(1,10),new EntityWrapper<Lables>()); List<Lables> records = page.getRecords(); int pageCount = lablesService.selectCount(new EntityWrapper<Lables>()); log.info("records" + records.toString()); log.info("selectPage" + page.toString()); log.info("selectCount" + pageCount); sb.append(page).append(pageCount).append(records); return sb.toString(); }
import com.young4j.entity.Area; import com.baomidou.mybatisplus.mapper.BaseMapper; /** * <p> * 区 Mapper 接口 * </p> * * @author yangfei * @since 2017-09-08 */ public interface AreaDao extends BaseMapper<Area> { }
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.young4j.dao.AreaDao"> </mapper>
package com.young4j.service; import com.young4j.entity.Area; import com.baomidou.mybatisplus.service.IService; /** * <p> * 区 服务类 * </p> * * @author yangfei * @since 2017-09-08 */ public interface AreaService extends IService<Area> { }
package com.young4j.service.impl; import com.young4j.entity.Area; import com.young4j.dao.AreaDao; import com.young4j.service.AreaService; import com.baomidou.mybatisplus.service.impl.ServiceImpl; import org.springframework.stereotype.Service; /** * <p> * 区 服务实现类 * </p> * * @author yangfei * @since 2017-09-08 */ @Service public class AreaServiceImpl extends ServiceImpl<AreaDao, Area> implements AreaService { }
