MyBatis 标签的使用

示例【根据学生姓名和班级信息查询】

创建t_student表

创建Student

package com.po;
public class Student {
	private Integer sid;		//学号
	private String sname;		//姓名
	private String sex;			//性别
	private String classes;		//班级
	public Integer getSid() {
		return sid;
	}
	public void setSid(Integer sid) {
		this.sid = sid;
	}
	public String getSname() {
		return sname;
	}
	public void setSname(String sname) {
		this.sname = sname;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public String getClasses() {
		return classes;
	}
	public void setClasses(String classes) {
		this.classes = classes;
	}
	@Override
	public String toString() {
		return "Student [sid=" + sid + ", sname=" + sname + ", sex=" + sex + ", classes=" + classes + "]";
	}	
}

创建StudentMapper.xml

	
	
		select * from t_student where 1=1
		
			and sname like concat('%',#{sname},'%')
		
		
			and classes=#{classes}
		
	

配置mybatis-config.xml并加StudentMapper.xml

创建StudentDao

package com.dao;
import java.util.ArrayList;
import java.util.List;
import org.apache.ibatis.session.SqlSession;
import org.junit.jupiter.api.Test;
import com.factory.SessionFactory;
import com.po.Student;
public class StudentDao {
	private SqlSession session=SessionFactory.getSqlSession();
	private List students=new ArrayList();
	@Test
	public void getStudentByNameAndClasses(){
		Student stu=new Student();
		stu.setSname("张三");
		stu.setClasses("大一");
		students=session.selectList("com.mapper.StudentMapper.getStudentByNameAndClasses", stu);
		for (Student student : students) {
			System.out.println(student);
		}
	}
}

传递sname、classes两个参数，然后执行getStudentByNameAndClasses()方法

只传递classses参数，然后执行getStudentByNameAndClasses()方法