内容简介:版权声明:本文为博主原屙文章,喜欢你就担走。 https://blog.csdn.net/leftfist/article/details/85089264
版权声明:本文为博主原屙文章,喜欢你就担走。 https://blog.csdn.net/leftfist/article/details/85089264
近期用了下mybatis,感觉不错,比起hibernate来,好像简单不少。使用方法总结如下:
一、代码结构
要有实体类,映射类。映射在于决定如何访问数据库,实体类在于接收查询返回值。
二、映射
最关键的地方在于映射了吧。
我用的是spring boot,sql定义采用的是注解的方式。
package api.mapper; import api.entity.BootFull; import api.entity.Fishboat_Radar; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Param; import org.apache.ibatis.annotations.Select; import org.springframework.stereotype.Repository; import java.util.List; @Repository @Mapper public interface FishboatMapper { //返回单表多条记录 @Select("select * from fishboat_radar where sequence=(select max(sequence) from fishboat_radar)") List<Fishboat_Radar> getNewList(); //返回多表多条记录 @Select("select t1.*,\n" + "t3.imo,\n" + "t3.length,\n" + "t3.wide,\n" + "t3.mothershipmmsi, \n" + "t3.destination,\n" + "t3.vendorid,\n" + "t3.callsign,\n" + "t3.shipclass,\n" + "t3.shiptype,\n" + "t3.vesselname \n" + "from jczs.fishboat_radar t1\n" + "join (select max(sequence) as sequence from jczs.fishboat_radar) t2 on t1.sequence=t2.sequence\n" + "left outer join jczs.yb_hlx_ais t3 on t1.guid=t3.guid") List<BootFull> getFullNewList(); //返回单表单条记录 @Select("select * from fishboat_radar where GUID=#{guid}") Fishboat_Radar findByGUID(@Param("guid") String guid); }
三、实体类
实体类的属性对应数据表字段,但似乎大小写没有啥关系,mybatis会自动匹配。
package api.entity; import java.util.Date; import lombok.Getter; import lombok.Setter; public class Fishboat_Radar{ private @Getter @Setter String GUID; private @Getter @Setter long sequence; private @Getter @Setter long ID; private @Getter @Setter int type; private @Getter @Setter double latitude; private @Getter @Setter double longitude; private @Getter @Setter double speed; private @Getter @Setter double direction; private @Getter @Setter Date create_date; private @Getter @Setter int MMSI; private @Getter @Setter String targetName; private @Getter @Setter String timestamp; }
package api.entity; import lombok.Getter; import lombok.Setter; public class BootFull extends Fishboat_Radar { private @Getter @Setter int IMO; private @Getter @Setter long length; private @Getter @Setter long wide; private @Getter @Setter int motherShipMMSI; private @Getter @Setter String destination; private @Getter @Setter String vendorID; private @Getter @Setter String callSign; private @Getter @Setter String shipClass; private @Getter @Setter String shipType; private @Getter @Setter String vesselName; }
四、相关配置文件
build.gradle
dependencies { compile("org.springframework.boot:spring-boot-starter-web") testCompile("org.springframework.boot:spring-boot-starter-test") //部署到外部tomcat providedCompile("org.springframework.boot:spring-boot-starter-tomcat") //thymeleaf compile("org.springframework.boot:spring-boot-starter-thymeleaf") //oracle compile("com.oracle:ojdbc7:12.1.0.1") //mybatis compile("org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.0") testCompile('org.mybatis.spring.boot:mybatis-spring-boot-starter-test:1.3.0') }
application.properties
spring.jpa.database=oracle spring.datasource.driver-class-name=oracle.jdbc.driver.OracleDriver spring.datasource.url=jdbc:oracle:thin:@192.168.0.22:1522/pdbzjfwpt spring.datasource.username=jczs spring.datasource.password=jczs spring.jpa.hibernate.ddl-auto=update #网上有些教程说需要指明实体类所在路径,事实上不需要 #mybatis.typeAliasesPackage=api.entity
五、调用
从代码来看,应用mybatis,代码会得到简化,因为Repository与mapper合在一起了,如果是hibernate,映射归映射,仓库归仓库。
package api.controller; import api.entity.Author; import api.entity.BootFull; import api.entity.Fishboat_Radar; import api.mapper.FishboatMapper; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController @RequestMapping(value="/api/boats") public class BoatController { @Autowired private FishboatMapper boatMapper; @RequestMapping(value = {"/",""}, method = RequestMethod.GET) public List<Fishboat_Radar> getList() { List<Fishboat_Radar> boats = boatMapper.getNewList(); return boats; } @RequestMapping(value = "/full", method = RequestMethod.GET) public List<BootFull> getFullList() { List<BootFull> boats = boatMapper.getFullNewList(); return boats; } @RequestMapping(value = "/{guid}", method = RequestMethod.GET) public Fishboat_Radar findByGUID(@PathVariable String guid) { Fishboat_Radar boat = boatMapper.findByGUID(guid); return boat; } }
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