第一步添加依赖
mysql mysql-connector-java8.0.28 org.mybatis mybatis3.5.9 test
src/main/java ***.properties src/main/resources ***.properties
第二步写配置
在resources里面建立
1.jdbc.properties
jdbc.driverClassName=com.mysql.cj.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/ssm?useUnicode=true&characterEncoding=utf8 jdbc.username=root jdbc.password=root
2.建立SqlMapConfig.xml
第三步
建立实体Users
package com.wzx.pojo;
import java.util.Date;
public class Users {
private Integer id;
private String userName;
private Date birthday;
private String sex;
private String address;
public Users() {
}
public Users(String userName, Date birthday, String sex, String address) {
this.userName = userName;
this.birthday = birthday;
this.sex = sex;
this.address = address;
}
public Users(Integer id, String userName, Date birthday, String sex, String address) {
this.id = id;
this.userName = userName;
this.birthday = birthday;
this.sex = sex;
this.address = address;
}
@Override
public String toString() {
return "Users{" +
"id=" + id +
", userName='" + userName + ''' +
", birthday=" + birthday +
", sex='" + sex + ''' +
", address='" + address + ''' +
'}';
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
第四步创建接口
动态代理要求
接口与Mapper文件要相同的名字，相同的包
建立UserMapper接口与UserMapper.xml
接口代码
package com.wzx.mapper;
import com.wzx.pojo.Users;
import java.util.List;
public interface UserMapper {
//查询去拿不用户信息
List getAll();
//根据用户主键查用户
Users getById(Integer id);
//根据用户名模糊查询用户
List getByName(String name);
//用户的更新
int update(Users users);
//根据主键删除用户
int delete(Integer id);
//增加用户
int insert(Users users);
}
Usermapper.xml代码
测试类
package com.wzx;
import com.wzx.mapper.UserMapper;
import com.wzx.pojo.Users;
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.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
public class MyTest {
SqlSession sqlSession;
UserMapper mapper;
SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
@Before
public void openSqlSession() throws IOException {
//读取核心配置文件
InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
//创建SqlSessionFactory对象
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
//取出SqlSession对象
sqlSession = factory.openSession();
//取出动态代理的对象，完成接口中方法的调用，实则是使用xml文件中的标签的功能
mapper = sqlSession.getMapper(UserMapper.class);
}
@After
public void closeSqlSession() {
sqlSession.close();
}
@Test
public void testGetAll() {
// 就是在调用接口的方法，mybatis框架已经为我们把功能代理出来了
List list = mapper.getAll();
System.out.println(list);
list.forEach(users -> System.out.println(users));
}
@Test
public void testupdate() throws ParseException {
Users u = new Users(7, "wzx", sf.parse("2001-01-01"), "2", "asd");
int update = mapper.update(u);
System.out.println(update);
sqlSession.commit();
}
@Test
public void selectById() {
Users byId = mapper.getById(7);
System.out.println(byId);
}
@Test
public void getByName(){
List name = mapper.getByName("张");
name.forEach(users -> System.out.println(users));
}
@Test
public void delete(){
int delete = mapper.delete(7);
System.out.println(delete);
sqlSession.commit();
}
@Test
public void insert() throws ParseException {
Users users = new Users(8, "asd", sf.parse("2022-11-22"), "1", "asd");
int insert = mapper.insert(users);
System.out.println(insert);
sqlSession.commit();
}
}
不足：更新与添加的sql语句不知道为什么老是报错，以后自己找到了来这里更改
