Maven使用注解配置SQL映射器（@Results，@ResultMap）
2024-04-08 22:22:04
工程目录：
一、@Results映射
Client.java
package client;import java.io.*;
import java.util.List;
import org.apache.ibatis.io.*;
import org.apache.ibatis.session.*;
import domain.Employee;
import domain.UserMapper;public class Client {public static void main(String args[]) throws IOException {InputStream in=null;SqlSessionFactory factory=null;SqlSession sqlSession=null;try {in = Resources.getResourceAsStream("mybatis-config.xml");}catch(IOException e) {e.printStackTrace();}try {factory = new SqlSessionFactoryBuilder().build(in);sqlSession = factory.openSession(); UserMapper userMapper=sqlSession.getMapper(UserMapper.class);List<Employee> list = userMapper.selectEmpByEmpId(1);for(Employee emp:list)System.out.println(emp.getDeptId()+" "+emp.getEmpId()+" "+emp.getName());sqlSession.commit();}catch(Exception e) {e.printStackTrace();if(sqlSession!=null) {sqlSession.rollback();}}finally {if(sqlSession!=null) {sqlSession.close();}}}
}Department.java
package domain;public class Department {private int deptId;private String deptName;public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}public String getDeptName() {return deptName;}public void setDeptName(String deptName) {this.deptName = deptName;}
}Employee.java
package domain;public class Employee {private int empId;private String name;private int deptId;public int getEmpId() {return empId;}public void setEmpId(int empId) {this.empId = empId;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}
}domain.UserMapper.java
package domain;import java.util.List;
import org.apache.ibatis.annotations.*;public interface UserMapper {@Select("select * from employee where empId=#{empId}")@Results({@Result(id=true,column="empId",property="empId"),@Result(column="name",property="name"),@Result(column="deptId",property="deptId")})public List<Employee> selectEmpByEmpId(int empId);
}mapper.UserMapper.xml
<?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="domain.UserMapper">
</mapper>Employee表：
查询结果：
二、@ResultMap映射，当要重复使用这个 resultMap时，可用@ResultMap注解在各个需要的接口方法上引用它
Client.java
package client;import java.io.*;
import java.util.List;
import org.apache.ibatis.io.*;
import org.apache.ibatis.session.*;
import domain.Employee;
import domain.EmpMapper;public class Client {public static void main(String args[]) throws IOException {InputStream in=null;SqlSessionFactory factory=null;SqlSession sqlSession=null;try {in = Resources.getResourceAsStream("mybatis-config.xml");}catch(IOException e) {e.printStackTrace();}try {factory = new SqlSessionFactoryBuilder().build(in);factory.getConfiguration().addMapper(EmpMapper.class);sqlSession = factory.openSession(); EmpMapper userMapper=sqlSession.getMapper(EmpMapper.class);List<Employee> list = userMapper.selectEmpByEmpId(1);for(Employee emp:list)System.out.println(emp.getDeptId()+" "+emp.getEmpId()+" "+emp.getName());sqlSession.commit();}catch(Exception e) {e.printStackTrace();if(sqlSession!=null) {sqlSession.rollback();}}finally {if(sqlSession!=null) {sqlSession.close();}}}
}domain.EmpMapper.java
package domain;import java.util.List;
import org.apache.ibatis.annotations.*;public interface EmpMapper {@Select("select * from employee where empId=#{empId}")@ResultMap("mapper.UserMapper.empResultMap")public List<Employee> selectEmpByEmpId(int empId);
}mapper.UserMapper.xml
<?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="mapper.UserMapper"><resultMap type="domain.Employee" id="empResultMap"><id property="empId" column="empId" /><result property="name" column="name" /><result property="deptId" column="deptId" /></resultMap>
</mapper>查询结果：
三、@ResultMap配置一对一关联查询
Client.java
package client;import java.io.*;
import java.util.List;
import org.apache.ibatis.io.*;
import org.apache.ibatis.session.*;
import domain.Employee;
import domain.EmpMapper;public class Client {public static void main(String args[]) throws IOException {InputStream in=null;SqlSessionFactory factory=null;SqlSession sqlSession=null;try {in = Resources.getResourceAsStream("mybatis-config.xml");}catch(IOException e) {e.printStackTrace();}try {factory = new SqlSessionFactoryBuilder().build(in);factory.getConfiguration().addMapper(EmpMapper.class);sqlSession = factory.openSession(); EmpMapper userMapper=sqlSession.getMapper(EmpMapper.class);List<Employee> list = userMapper.selectEmpByEmpId(1);for(Employee emp:list)System.out.println(emp.getDeptId()+" "+emp.getEmpId()+" "+emp.getName()+" "+emp.getDepts().getDeptName());sqlSession.commit();}catch(Exception e) {e.printStackTrace();if(sqlSession!=null) {sqlSession.rollback();}}finally {if(sqlSession!=null) {sqlSession.close();}}}
}Employee.java
package domain;public class Employee {private int empId;private String name;private int deptId;private Department depts;public int getEmpId() {return empId;}public void setEmpId(int empId) {this.empId = empId;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}public Department getDepts() {return depts;}public void setDepts(Department depts) {this.depts = depts;}
}Department.java
package domain;public class Department {private int deptId;private String deptName;public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}public String getDeptName() {return deptName;}public void setDeptName(String deptName) {this.deptName = deptName;}
}EmpMapper.java(interface)
package domain;import java.util.List;
import org.apache.ibatis.annotations.*;public interface EmpMapper {@Select("select * from employee,department where empId=#{empId}")@ResultMap("mapper.UserMapper.empAndDeptResultMap")public List<Employee> selectEmpByEmpId(int empId);
}mapper.UserMapper.xml
<?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="mapper.UserMapper"><resultMap type="domain.Employee" id="empAndDeptResultMap"><id property="empId" column="empId" /><result property="name" column="name" /><result property="deptId" column="deptId" /><association property="depts" resultMap="deptResultMap"></association></resultMap><resultMap type="domain.Department" id="deptResultMap"><id property="deptId" column="deptId" /><result property="deptName" column="deptName" /></resultMap>
</mapper>employee表：
department表：
查询结果：
四、@ResultMap配置一对多查询
Client.java
package client;import java.io.*;
import org.apache.ibatis.io.*;
import org.apache.ibatis.session.*;
import domain.Employee;
import domain.Department;
import domain.EmpMapper;public class Client {public static void main(String args[]) throws IOException {InputStream in=null;SqlSessionFactory factory=null;SqlSession sqlSession=null;try {in = Resources.getResourceAsStream("mybatis-config.xml");}catch(IOException e) {e.printStackTrace();}try {factory = new SqlSessionFactoryBuilder().build(in);factory.getConfiguration().addMapper(EmpMapper.class);sqlSession = factory.openSession(); EmpMapper userMapper=sqlSession.getMapper(EmpMapper.class);Department dept = userMapper.selectDeptBydeptId(1);for(Employee emp:dept.getEmps())System.out.println(emp.getName()+" "+dept.getDeptId()+" "+dept.getDeptName());sqlSession.commit();}catch(Exception e) {e.printStackTrace();if(sqlSession!=null) {sqlSession.rollback();}}finally {if(sqlSession!=null) {sqlSession.close();}}}
}Department.java
package domain;import java.util.List;public class Department {private int deptId;private String deptName;private List<Employee> emps;public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}public String getDeptName() {return deptName;}public void setDeptName(String deptName) {this.deptName = deptName;}public List<Employee> getEmps() {return emps;}public void setEmps(List<Employee> emps) {this.emps = emps;}
}Employee.java
package domain;public class Employee {private int empId;private String name;private int deptId;public int getEmpId() {return empId;}public void setEmpId(int empId) {this.empId = empId;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getDeptId() {return deptId;}public void setDeptId(int deptId) {this.deptId = deptId;}
}EmpMapper.java(interface)
package domain;import org.apache.ibatis.annotations.*;public interface EmpMapper {@Select("select * from department,employee where department.deptId=employee.deptId and department.deptId=#{deptId}")@ResultMap("mapper.UserMapper.deptAndEmpResultMap")public Department selectDeptBydeptId(int deptId);
}mapper.UserMapper.xml
<?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="mapper.UserMapper"><resultMap type="domain.Employee" id="empResultMap"><id property="empId" column="empId" /><result property="name" column="name" /><result property="deptId" column="deptId" /></resultMap><resultMap type="domain.Department" id="deptAndEmpResultMap"><id property="deptId" column="deptId" /><result property="deptName" column="deptName" /><collection property="emps" resultMap="empResultMap"></collection></resultMap>
</mapper>employee表：
department表：
查询结果：
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