Mybatis学习之单表增删改查

<?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.mybatis.inter.IStudentOperation">
	<!--  自定义resultMap -->
	<resultMap type="Student" id="resultListStudent">
		<id column="id" property="id"/>
		<result column="name" property="name"/>
		<result column="password" property="password"/>
	</resultMap>
	
	<select id="getStudentById" parameterType="int" resultType="Student">
		select * from student where id=#{id}
	</select>
	
	<select id="getAllStudents" resultMap="resultListStudent">
		select * from student
	</select>
	
	<insert id="addStudent" parameterType="Student" useGeneratedKeys="true" keyProperty="id">
		insert into student(name,password)
			values(#{name},#{password})
	</insert>
	
	<update id="updateStudent" parameterType="Student">
		update student 
			set name=#{name},
				password=#{password}
			where id=#{id}
	</update>
	
	<delete id="deleteStudent" parameterType="int">
		delete from student where id=#{id}
	</delete>
</mapper>

　　

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
  "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<!-- 命名别名 -->
	<typeAliases>
		<typeAlias alias="Student" type="com.mybatis.bean.Student"/>
	</typeAliases>

	<environments default="development">
		<environment id="development">
			<transactionManager type="JDBC" />
			<dataSource type="POOLED">
				<property name="driver" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://127.0.0.1:3306/test" />
				<property name="username" value="root" />
				<property name="password" value="root" />
			</dataSource>
		</environment>
	</environments>
	<mappers>
		<mapper resource="com/mybatis/bean/Student.xml" />
	</mappers>
</configuration>

　　

package com.mybatis.bean;

public class Student {
	
	private int id;
	
	private String name;
	
	private String password;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

}

　　

package com.mybatis.util;

import java.io.IOException;
import java.io.Reader;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

public class MybatisUtil {
	private static SqlSessionFactory sqlSessionFactory;

	public static SqlSessionFactory getSqlSessionFactory() throws IOException {
		if (sqlSessionFactory == null) {
			String resource = "mybatis-config.xml";
			Reader reader = Resources.getResourceAsReader(resource);
			sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
		}
		return sqlSessionFactory;
	}
}

　　

package com.mybatis.inter;

import java.util.List;

import com.mybatis.bean.Student;

public interface IStudentOperation {

	public Student getStudentById(int id);

	public List<Student> getAllStudents();
	
	public void addStudent(Student student);
	
	public void updateStudent(Student student);
	
	public void deleteStudent(int id);
}

　　

package com.mybatis.test;

import java.io.IOException;
import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;

import com.mybatis.bean.Student;
import com.mybatis.inter.IStudentOperation;
import com.mybatis.util.MybatisUtil;

public class Test {
	public static void main(String[] args) {
		SqlSessionFactory factory=null;
		SqlSession session=null;
		try {
			factory=MybatisUtil.getSqlSessionFactory();
			session=factory.openSession();
			
			IStudentOperation studentOperation=session.getMapper(IStudentOperation.class);
			/**
			 * 单条记录查询
			 */
//			Student student = studentOperation.getStudentById(1);
//			System.out.println("student name :"+student.getName());
//			System.out.println("student password :"+student.getPassword());
			
			/**
			 * 多条记录查询，重写resultMap
			 */
//			List<Student> allStudents = studentOperation.getAllStudents();
//			if(allStudents != null && allStudents.size() >0) {
//				for(Student student:allStudents) {
//					System.out.println("student name :"+student.getName());
//					System.out.println("student password :"+student.getPassword());
//				}
//			}
			/**
			 * 增加数据，一定要提交 
			 */
//			Student student=new Student();
//			student.setName("ddd");
//			student.setPassword("456");
//			studentOperation.addStudent(student);
//			session.commit();//必须要提交事务，否则将不会记录到数据库中
//			System.err.println(student.getId());
			
			/**
			 * 更新数据，一定要提交
			 */
//			Student student = studentOperation.getStudentById(1);
//			student.setName("zcs"); 
//			student.setPassword("111");
//			studentOperation.updateStudent(student);
//			session.commit();
			
			/**
			 * 删除数据,一定要提交
			 */
//			studentOperation.deleteStudent(1);
//			session.commit();
			
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}

}