任务:
1、在idea中配置好数据源
2、视频案例中只给出了查询所有结果的示例,请自己完成添加、删除、修改操作的代码。以下供参考。
package com.example.pojo;
public class User {
private Integer id; //id(主键)
private String name; //姓名
private Short age; //年龄
private Short gender; //性别
private String phone; //手机号
public User(Integer id, String name, Short age, Short gender, String phone) {
this.id = id;
this.name = name;
this.age = age;
this.gender = gender;
this.phone = phone;
}
public User() {
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Short getAge() {
return age;
}
public void setAge(Short age) {
this.age = age;
}
public Short getGender() {
return gender;
}
public void setGender(Short gender) {
this.gender = gender;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
package com.example.mapper;
import com.example.pojo.User;
import org.apache.ibatis.annotations.*;
import java.util.List;
@Mapper
public interface UserMapper {
//查询所有用户数据
@Select("select id, name, age, gender, phone from user")
public List<User> list();
@Insert("insert into user(name, age, gender, phone) values (#{name}, #{age}, #{gender}, #{phone})")
public void insert(User user);
@Delete(" delete from user where id= #{id} ")
public void delete(int id);
@Select("select * from user where id= #{id} ")
public User get(int id);
@Update("update user set name=#{name} where id=#{id} ")
public int update(User user);
}
package com.example;
import com.example.mapper.UserMapper;
import com.example.pojo.Peot;
import com.example.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
@SpringBootTest
class MybatisApplicationTests {
@Autowired
private UserMapper userMapper;
@Test
public void listAll(){
List<User> userList = userMapper.list();
for (User user : userList) {
System.out.print(user.getId()+",");
System.out.print(user.getName()+",");
System.out.print(user.getAge()+",");
System.out.print(user.getGender()+",");
System.out.println(user.getPhone());
}
}
@Test
public void update() {
User c= userMapper.get(8);
c.setName("wangwei");
userMapper.update(c);
listAll();
}
@Test
public void get() {
User c= userMapper.get(8);
System.out.print(c.getId()+",");
System.out.print(c.getName()+",");
System.out.print(c.getAge()+",");
System.out.print(c.getGender()+",");
System.out.println(c.getPhone());
}
@Test
public void delete() {
userMapper.delete(8);
listAll();
}
@Test
public void insert() {
User c = new User();
c.setName("王维");
c.setGender((short)1);
c.setAge((short)1);
c.setPhone("12343234543");
userMapper.insert(c);
listAll();
}
}
3、idea的sql 控制台,可以测试sql语句是否正确。所以mapper接口中的sql语句可以先测试。对于有参数的情况,用?代替。
运行sql语句时,idea会有参数输入窗口。
2、对以下案例使用mybatis进行添加、删除、修改、更新的操作。