使用mybatis框架完成学生信息的增删改查操作的完整代码书写-代码拿走即用-看完秒懂哦
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基于mybatis框架的增删改查操作(●'◡'●
- 1:首先在java文件下的bean包建立一个学生类
- 2:在java文件下的dao包建立一个对学生信息操作的方法接口:
- 3:在resource文件下导入mybatis-config.xml配置文件和log4j.properties文件:
- 4:在C:\\Users\\Dell\\Desktop\\mybatis_day03_crud\\src\\main\\resources\\mybatis\\dao文件下编写一个StudentMapper.xml文件,里面书写数据库操作语言:
- 5:在C:\\Users\\Dell\\Desktop\\mybatis_day03_crud\\src\\test\\java\\mybatis\\test文件下编写一个测试类把鼠标移到每一个@Test标签的后边,右键测试即可:
1:首先在java文件下的bean包建立一个学生类
package net.chinaedu.mybatis.bean;
public class Student
private Integer sid;
private String sname;
private Integer age;
private String gender;
public Student()
public Student(Integer sid, String sname, Integer age, String gender)
this.sid = sid;
this.sname = sname;
this.age = age;
this.gender = gender;
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 Integer getAge()
return age;
public void setAge(Integer age)
this.age = age;
public String getGender()
return gender;
public void setGender(String gender)
this.gender = gender;
@Override
public String toString()
return "Student" +
"sid=" + sid +
", sname='" + sname + '\\'' +
", age=" + age +
", gender='" + gender + '\\'' +
'';
2:在java文件下的dao包建立一个对学生信息操作的方法接口:
package net.chinaedu.mybatis.dao;
import net.chinaedu.mybatis.bean.Student;
import java.util.List;
public interface IStudentDao
/**
* 查询所有学生信息
*
* @return
*/
List<Student> selectAll();
/**
* 添加学生信息
*
* @param student
*/
void add(Student student);
/**
* 更新学生信息
*
* @param student
*/
void update(Student student);
/**
* 通过id删除学生信息
*
* @param sid
*/
void delete(Integer sid);
/**
* 通过id查询学生信息
*
* @param sid
* @return
*/
Student selectBySid(Integer sid);
/**
* 通过名称模糊查询学生信息
*
* @param sname
* @return
*/
List<Student> selectBySname(String sname);
/**
* 查询所有的学生信息
*
* @return
*/
int selectTotal();
3:在resource文件下导入mybatis-config.xml配置文件和log4j.properties文件:
mybatis-config.xml
<?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>
<!--配置mybatis环境-->
<environments default="mysql">
<!--配置mysql环境-->
<environment id="mysql">
<!--配置事务类型-->
<transactionManager type="JDBC"></transactionManager>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/hckj"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--告知mybatis映射文件的位置-->
<mapper resource="net/chinaedu/mybatis/dao/StudentMapper.xml"/>
<!--告知mybatis注解注解所在的接口位置-->
<!--<mapper class="net.chinaedu.mybatis.dao.IStudentDao"/>-->
</mappers>
</configuration>
log4j.properties
### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.err
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%dABSOLUTE %5p %c1:%L - %m%n
### direct messages to file mylog.log ###
log4j.appender.file=org.apache.log4j.FileAppender
log4j.appender.file.File=c:\\mylog.log
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%dABSOLUTE %5p %c1:%L - %m%n
### set log levels - for more verbose logging change 'info' to 'debug' ###
log4j.rootLogger=info, stdout
4:在C:\\Users\\Dell\\Desktop\\mybatis_day03_crud\\src\\main\\resources\\mybatis\\dao文件下编写一个StudentMapper.xml文件,里面书写数据库操作语言:
<?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="net.chinaedu.mybatis.dao.IStudentDao">
<!--配置selectAll方法-->
<select id="selectAll" resultType="net.chinaedu.mybatis.bean.Student">
select * from student
</select>
<!--配置add方法-->
<insert id="add" parameterType="net.chinaedu.mybatis.bean.Student">
insert into student(sname, age, gender) values(#sname, #age, #gender)
</insert>
<!--配置update方法-->
<update id="update" parameterType="net.chinaedu.mybatis.bean.Student">
update student set sname=#sname, age=#age, gender=#gender where sid=#sid
</update>
<!--配置delete方法-->
<delete id="delete" parameterType="java.lang.Integer">
delete from student where sid=#sid
</delete>
<!--配置selectBySid方法-->
<select id="selectBySid" parameterType="int" resultType="net.chinaedu.mybatis.bean.Student">
select * from student where sid=#sid
</select>
<!--配置selectBySname方法-->
<select id="selectBySname" parameterType="String" resultType="net.chinaedu.mybatis.bean.Student">
<!--select * from student where sname like #sname-->
<!--/*value是固定写法*/-->
select * from student where sname like '%$value%'
</select>
<!--配置selectTotal方法-->
<select id="selectTotal" resultType="int">
select count(sid) from student
</select>
</mapper>
5:在C:\\Users\\Dell\\Desktop\\mybatis_day03_crud\\src\\test\\java\\mybatis\\test文件下编写一个测试类把鼠标移到每一个@Test标签的后边,右键测试即可:
package net.chinaedu.mybatis.test;
import net.chinaedu.mybatis.bean.Student;
import net.chinaedu.mybatis.dao.IStudentDao;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
public class TestMybatisCrud
private SqlSession session;
private InputStream is;
// Before注解
@Before
public void init() throws IOException
// 1.加载文件
is = Resources.getResourceAsStream("mybatis-config.xml");
// 2.构建builder对象
SqlSessionFactoryBuilder builder = new SqlSessionFactoryBuilder();
// 3.构建factory对象
SqlSessionFactory factory = builder.build(is);
// 4.构建session对象
session = factory.openSession();
// After注解
@After
public void close() throws IOException
// 7.关闭资源
session.close();
is.close();
@Test
public void testAdd()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用新增方法
Student student = new Student(0, "张倩倩", 18, "女");
studentDao.add(student);
// 提交事务
session.commit();
@Test
public void testUpdate()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用修改方法
Student student = new Student(4, "小贱贱", 22, "男");
studentDao.update(student);
// 提交事务
session.commit();
@Test
public void testDelete()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用删除方法
studentDao.delete(4);
// 提交事务
session.commit();
@Test
public void testSelectBySid()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用查询方法
Student student = studentDao.selectBySid(9);
System.out.println(student);
@Test
public void testSelectBySname()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用查询方法
// List<Student> students = studentDao.selectBySname("%张%");
List<Student> students = studentDao.selectBySname("张");
for (Student student : students)
System.out.println(student);
@Test
public void testSelectTotal()
// 5.构建持久层接口对象
IStudentDao studentDao = session.getMapper(IStudentDao.class);
// 6.调用查询方法
int count = studentDao.selectTotal();
System.out.println(count);
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