Employee.java
package com.atguigu.bean;
public class Employee {
private Integer id;
private String empName;
private String email;
private Integer gender;
public Employee() {
}
public Employee(Integer id, String empName, String email, Integer gender) {
this.id = id;
this.empName = empName;
this.email = email;
this.gender = gender;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public Integer getGender() {
return gender;
}
public void setGender(Integer gender) {
this.gender = gender;
}
@Override
public String toString() {
return "Employee [id=" + id + ", empName=" + empName + ", email="
+ email + ", gender=" + gender + "]";
}
}
EmployeeDao.java
package com.atguigu.dao;
import com.atguigu.bean.Employee;
public interface EmployeeDao {
public Employee getEmpById(Integer id);
public int updateEmployee(Employee employee);
public boolean deleteEmployee(Integer id);
public int insertEmployee(Employee employee);
}
MyBatisの-config.xmlの
<?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>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<!-- 配置连接池 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis_0325"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<!-- mappers中注册我们所有写的dao接口的实现文件 -->
<mappers>
<!--resource:表示从类路径下找资源 -->
<mapper resource="EmployeeDao.xml"/>
</mappers>
</configuration>
EmployeeDao.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">
<!--namespace：名称空间；写接口的全类名，相当于告诉MyBatis这个配置文件是实现哪个接口的； -->
<mapper namespace="com.atguigu.dao.EmployeeDao">
<!--public Employee getEmpById(Integer id); 参数类型不用写 -->
<!-- sql语句中不要写分号 -->
<select id="getEmpById" resultType="com.atguigu.bean.Employee">
select * from t_employee where id=#{id}
</select>
<!-- 增删改不用写返回值类型，增删改返回的是影响多少行
mybatis会自动判断，如果是数字类型（int，long）;如果是boolean（影响0行自动封装成false，否则为true）
-->
<!--
#{属性名} 从传入的参数对象中取出对应属性的值
-->
<!--public int updateEmployee(Employee employee);-->
<update id="updateEmployee">
UPDATE t_employee
set empname=#{empName},gender=#{gender},email=#{email}
WHERE id=#{id}
</update>
<!--public boolean deleteEmployee(Integer id);-->
<delete id="deleteEmployee">
DELETE FROM t_employee WHERE id=#{id}
</delete>
<!--public int insertEmployee(Employee employee);-->
<insert id="insertEmployee" >
INSERT INTO t_employee(empname,gender,email) VALUES (#{empName},#{gender},#{email})
</insert>
</mapper>
MyBatisCRUDTest.java
package com.atguigu.test;
import com.atguigu.bean.Employee;
import com.atguigu.dao.EmployeeDao;
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.Before;
import org.junit.Test;
import java.io.IOException;
import java.io.InputStream;
public class MyBatisCRUDTest {
//工厂一个
SqlSessionFactory sqlSessionFactory;
@Before
public void initSqlSessionFactory() throws IOException {
//1、根据全局配置文件先得到SqlSessionFactory对象
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
}
/**
* 测试更新
*/
@Test
public void testUpdate(){
//1.获取和数据库的一次会话
//自动提交
SqlSession openSession = sqlSessionFactory.openSession(true);
try {
//2、获取到接口的映射器
EmployeeDao mapper = openSession.getMapper(EmployeeDao.class);
//3、测试
int i = mapper.updateEmployee(new Employee(4, "止兮545", "[email protected]", 0));
System.out.println(i);
}finally {
openSession.close();
}
}
/**
* 测试删除
*/
@Test
public void testDelete(){
//1.获取和数据库的一次会话
//自动提交
SqlSession openSession = sqlSessionFactory.openSession(true);
try {
//2、获取到接口的映射器
EmployeeDao mapper = openSession.getMapper(EmployeeDao.class);
//3、测试
boolean i = mapper.deleteEmployee(5);
System.out.println(i);
}finally {
openSession.close();
}
}
/**
* 测试插入
*/
@Test
public void testInsert(){
//1.获取和数据库的一次会话
//自动提交
SqlSession openSession = sqlSessionFactory.openSession(true);
try {
//2、获取到接口的映射器
EmployeeDao mapper = openSession.getMapper(EmployeeDao.class);
//3、测试
int i = mapper.insertEmployee(new Employee(null, "止兮", "[email protected]", 0));
System.out.println(i);
}finally {
//手动提交
//openSession.commit();
openSession.close();
}
}
/**
* 测试查询
*/
@Test
public void test() throws IOException {
//1、根据全局配置文件先得到SqlSessionFactory对象
//initSqlSessionFactory(); //有注解@Before在这个方法上
//2、得到SqlSession对象，获取和数据库的一次会话；getConnection()；
SqlSession openSession = sqlSessionFactory.openSession();
//3、使用SqlSession操作数据库，获取到dao接口的实现
EmployeeDao employeeDao = openSession.getMapper(EmployeeDao.class);
Employee employee;
try {
//4、调用之前的方法
employee = employeeDao.getEmpById(1);
System.out.println(employee);
} finally {
openSession.close();
}
}
}
