springboot集成通用mapper详细配置

通常，我们利用mybatis写持久层方法。要么按照传统定义mapper方法，定义xml文件的方式，全部手写。要么需要通过mybatis-generator逆向工程插件生成大量的xxxExample文件，使得系统看起来比较臃肿。而通用mapper的引入，我们不需再生成大量的Example文件，并且通用mapper已经封装好了所有的单表操作。通用mapper与springboot项目集成配置如下：

pom.xml配置

<dependency>
	<groupId>tk.mybatis</groupId>
	<artifactId>mapper-spring-boot-starter</artifactId>
	<version>RELEASE</version>
</dependency>

定义通用Mapper基类

package com.gogle.mgt.dataaccess.mybatis;

import tk.mybatis.mapper.common.Mapper;
import tk.mybatis.mapper.common.MySqlMapper;

/**
 * @ClassName TkMapper
 * @Description TODO
 * @Date 2019/7/16 16:15
 * @Created by sunyiwei
 */
public interface TkMapper<T> extends Mapper<T>,MySqlMapper<T> {
}

yml文件配置

mybatis:
  mapper-locations: classpath:mapper/*.xml #定义xml文件位置，不是必须的，如果需要在xml写sql请配置此选项
  type-aliases-package: com.gogle.mgt.domain  # 注意：对应实体类的路径
mapper:
  mappers: com.gogle.mgt.dataaccess.mybatis.TkMapper #通用基类配置
  identity: MYSQL

注：通用基类请不要与我们下面要定义的mapper位于同一包下，否则运行会报错。

定义MapperScan

package com.gogle.mgt;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
import tk.mybatis.spring.annotation.MapperScan;

@EnableEurekaClient
@EnableFeignClients
@SpringBootApplication
@MapperScan(basePackages = { "com.gogle.mgt.dataaccess.mybatis.dao" })
public class VslmApplication {

	public static void main(String[] args) {
		SpringApplication.run(VslmApplication.class, args);
	}

}

注：此处MapperScan为tk.mybatis.spring.annotation.MapperScan，非org.mybatis.spring.annotation.MapperScan;

定义实体类

package com.gogle.mgt.domain;

import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Table;
import java.util.Date;

/**
 * @ClassName StreamLine
 * @Description TODO
 * @Date 2019/7/16 16:16
 * @Created by sunyiwei
 */
@Table(name="stream_line")
public class StreamLine {
    @Id
    String streamLineId;
    @Column(name = "name")
    String name;
    @Column(name = "area")
    String area;
    @Column(name = "spec_id")
    String specId;
    @Column(name = "vpl_id")
    String vplId;
    @Column(name = "status")
    byte status;
    @Column(name = "create_time")
    Date createTime;
    @Column(name = "modify_time")
    Date modifyTime;
    @Column(name = "modify_person")
    String modifyPerson;

    public StreamLine() {
    }
}

注：如果bean实体中含有数据表中不存在的字段，使用@Transient注解

mapper定义

package com.gogle.mgt.dataaccess.mybatis.dao;

import com.gogle.mgt.dataaccess.mybatis.TkMapper;
import com.gogle.mgt.domain.StreamLine;
import org.apache.ibatis.annotations.Select;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * @ClassName StreamLineMapper
 * @Description TODO
 * @Date 2019/7/16 16:23
 * @Created by sunyiwei
 */
@Repository
public interface StreamLineMapper extends TkMapper<StreamLine> {

    /**
     * 注解sql
     * @return
     */
    @Select("select * from stream_line")
    List<StreamLine> getAll();

    /**
     * xml定义语句
     */
    StreamLine getById(String streamLineId);
}

注：mapper中已经继承了TkMapper里面的所有单表操作的增删改查方法，上面的两个方法getAll与getById是我们自定义的方法，一种通过注解定义，另外一种是我们常用的在xml文件里面写方法。

测试

package com.gogle.mgt;

import java.util.List;

/**
 * @ClassName MapperTest
 * @Description TODO
 * @Date 2019/7/16 16:28
 * @Created by sunyiwei
 */
@RunWith(SpringRunner.class)
@SpringBootTest
public class MapperTest {
    @Autowired
    private StreamLineMapper mapper;

    /**
     * 继承自通用mapper的单表操作方法测试
     */
    @Test
    public void test(){
        StreamLine line = new StreamLine();
        line.setStreamLineId("001");
        line.setArea("萧山");
        int insert = mapper.insert(line);
        System.out.println(insert);
    }

    /**
     * 我们注解自定义的方法测试
     */
    @Test
    public void test2(){
        List<StreamLine> all = mapper.getAll();
        System.out.println(all);

    }

    /**
     * xml文件中定义接口测试
     */
    @Test
    public void test3(){
        StreamLine one = mapper.getById("001");
        System.out.println(one);

    }
}