5月7日作业

在课堂项目的基础之上实现如下需求，并测试，截图展示结果：

• 根据用户名查询用户信息

• package com.qiku.app;
  
  import com.qiku.entity.User;
  import com.qiku.utils.DruidUtils;
  import org.apache.commons.dbutils.QueryRunner;
  import org.apache.commons.dbutils.handlers.BeanHandler;
  import org.junit.Test;
  
  import java.sql.SQLException;
  
  public class ZYX {
  
          // 需求  根据用户名查询用户信息
          public User findUserMessage(String username) throws SQLException {
              QueryRunner qr = new QueryRunner(DruidUtils.dataSource);
              String sql = "select*from user where username = ?";
              User user = qr.query(sql, new BeanHandler(User.class), username);
              return user;
          }
  
          @Test
          public void TestFindUserMessage() throws SQLException {
              User userMessage = findUserMessage("渣渣辉");
              System.out.println(userMessage);
          }
      }
  

   

• 查询所有的用户信息

• package com.qiku.app;
  
  import com.qiku.entity.User;
  import com.qiku.utils.DruidUtils;
  import org.apache.commons.dbutils.QueryRunner;
  import org.apache.commons.dbutils.handlers.BeanListHandler;
  import org.junit.Test;
  
  import java.sql.SQLException;
  import java.util.List;
  
  public class ZYX {
  
      // 查询所有的用户信息
      public List findAllUserMessage() throws SQLException {
          QueryRunner qr = new QueryRunner(DruidUtils.dataSource);
          String sql = "select*from user";
          List userList = qr.query(sql, new BeanListHandler(User.class));
          return userList;
      }
      @Test
      public void TestFindAllUserMessage() throws SQLException {
          List userListMessage = findAllUserMessage();
          for (User userMessage : userListMessage){
              System.out.println(userMessage);
          }
      }
      }

   

• 修改指定用户的信息

package com.qiku.app;
import com.qiku.entity.User;
import com.qiku.utils.DruidUtils;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.junit.Test;
import java.sql.SQLException;


public class ZYX {
    QueryRunner qr = new QueryRunner(DruidUtils.dataSource);
    public int updateUserMessage(String username, String password) throws SQLException {
        String sql = "update user set password = ? where username = ?";
        int i = qr.update(sql, password, username);
        return i;
    }
    public String findUserPassWord(String username) throws SQLException {
        String sql = "select password from user where username = ?";
        return qr.query(sql, new BeanHandler(User.class), username).getPassword();
    }

    @Test
    public void testLogin() throws SQLException {
        String username = "渣渣辉";
        String newPassword = "000000";
        int i = updateUserMessage(username, newPassword);
        if (i > 0) {
            System.out.println("操作成功!");
        } else {
            System.out.println("操作失败~");
        }
    }
}

修改前：

 修改后：