开发工具:STS

代码下载链接:https://github.com/theIndoorTrain/SpringBoot_Mybatis/tree/7892801d804d2060774f3720f82e776ff318e3ba

前言:

在调用mybatis的查询条件时,之前,遇到需要验证多个参数的查询时,往往需要把所有参数都绑定到一个实体中去,然后调用获取。

现在,我们来详细描述mybatis传递参数的细节。


一、单个参数:

1.定义mapper接口:

 package com.xm.mapper;

 import java.util.List;

 import com.xm.pojo.Student;

 public interface StudentMapper {

     /**
* 根据name查询
* @param name
* @return
*/
public Student getByName(String name); }

StudentMapper.java

2.实现mapper映射:

 <?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.xm.mapper.StudentMapper"> <!-- 根据name查询 -->
<select id="getByName" resultType="student">
select * from student where name=#{name}
</select>
</mapper>

StudentMapper.xml

3.定义测试用例:

 package com.xm;

 import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner; import com.xm.mapper.StudentMapper;
import com.xm.pojo.Student; @RunWith(SpringRunner.class)
@SpringBootTest
public class StudentTest {
@Autowired
private StudentMapper studentMapper; @Test
public void selectStudent() { Student student = studentMapper.getByName("郭小明");
System.out.println(student); } }

StudentTest.java

4.测试结果:

(1)数据库查询结果:

(2)测试结果输出:

注意在mapper映射中,单个参数类型,也可以不写 parameterType="",参数名可以随意写,比如#{names}

实现mapper映射:

 <?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.xm.mapper.StudentMapper"> <!-- 根据name查询 -->
<select id="getByName" resultType="student">
<!-- select * from student where name=#{name} -->
select * from student where name=#{names}
</select>
</mapper>

StudentMapper.xml

二、多个参数

1.根据参数名查询

(1)定义mapper接口:

 package com.xm.mapper;

 import java.util.List;

 import com.xm.pojo.Student;

 public interface StudentMapper {

     /**
* 根据用户名和id同时查询
* @param id
* @param name
* @return
*/
public Student getStudentByIdAndName(Integer id,String name); }

StudentMapper.java

(2)实现mapper映射:

 <?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.xm.mapper.StudentMapper"> <!-- 根据用户名和id同时查询 -->
<select id="getStudentByIdAndName" resultType="student">
select * from student where name=#{name} and id=#{id}
</select>
</mapper>

StudentMapper.xml

(3)定义测试用例:

 package com.xm;

 import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner; import com.xm.mapper.StudentMapper;
import com.xm.pojo.Student; @RunWith(SpringRunner.class)
@SpringBootTest
public class StudentTest {
@Autowired
private StudentMapper studentMapper; @Test
public void selectStudent() { /*Student student = studentMapper.getByName("郭小明");*/
Student student = studentMapper.getStudentByIdAndName(1, "郭小明");
System.out.println(student); } }

StudentTest.java

(4)测试结果:

说明:这种简单的根据参数名传参是失败的

2.根据参数key值获取,获取规则为param1,param2,param3.........:

(1)实现mapper映射:

 <?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.xm.mapper.StudentMapper"> <!-- 根据用户名和id同时查询 -->
<select id="getStudentByIdAndName" resultType="student">
<!-- select * from student where name=#{name} and id=#{id} -->
select * from student where name=#{param2} and id=#{param1}
</select>
</mapper>

StudentMapper.xml

(2)测试结果:

说明:针对这种情况,如果参数较多的情况下,获取准确的参数名更好一些

3.绑定参数名

(1)定义mapper接口:

 package com.xm.mapper;

 import java.util.List;

 import org.apache.ibatis.annotations.Param;

 import com.xm.pojo.Student;

 public interface StudentMapper {

     /**
* 根据用户名和id同时查询
* @param id
* @param name
* @return
*/
public Student getStudentByIdAndName(@Param("id")Integer id,@Param("name")String name); }

StudentMapper.java

(2)实现mapper映射:

 <?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.xm.mapper.StudentMapper"> <!-- 根据用户名和id同时查询 -->
<select id="getStudentByIdAndName" resultType="student">
select * from student where name=#{name} and id=#{id}
<!-- select * from student where name=#{param2} and id=#{param1} -->
</select>
</mapper>

StudentMapper.xml

(3)测试结果:

说明:针对参数较多,且参数都属于同一个pojo类的时候,可以把参数先封装入实体,再获取

4.封装实体参数:

(1)定义mapper接口:

 package com.xm.mapper;

 import java.util.List;

 import org.apache.ibatis.annotations.Param;

 import com.xm.pojo.Student;

 public interface StudentMapper {

     /**
* 根据用户名和id同时查询
* @param id
* @param name
* @return
*/
public Student getStudentByIdAndName(Student student); }

StudentMapper.java

(2)定义测试用例:

 package com.xm;

 import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner; import com.xm.mapper.StudentMapper;
import com.xm.pojo.Student; @RunWith(SpringRunner.class)
@SpringBootTest
public class StudentTest {
@Autowired
private StudentMapper studentMapper; @Test
public void selectStudent() { /*Student student = studentMapper.getByName("郭小明");*/
/*Student student = studentMapper.getStudentByIdAndName(1, "郭小明");*/
Student student = new Student();
student.setName("郭小明");
student.setId(1);
Student student2 = studentMapper.getStudentByIdAndName(student);
System.out.println(student2); } }

StudentMapper.java

(3)测试结果:


                                                                                2018-07-02

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