我的问题是我无法从我的
mysql数据库中的表中打印出所有数据,我在给定的表“老师”中排在最后一行.有没有人可以帮我找到错误？
@H_301_2@using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MysqL.Data.MysqLClient;
namespace ReadDataFromMysqL
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender,EventArgs e)
{
string sql = " SELECT * FROM teacher ";
MysqLConnection con = new MysqLConnection("host=localhost;user=root;password=859694;database=projekt;");
MysqLCommand cmd = new MysqLCommand(sql,con);
con.Open();
MysqLDataReader reader = cmd.ExecuteReader();
while (reader.Read()) {
data2txt.Text = reader.GetString("id");
datatxt.Text = reader.GetString("userId");
}
}
private void btnclose_Click(object sender,EventArgs e)
{
Close();
}
}
}
解决方法
您的问题是您在每行数据上覆盖data2txt.Text和datatxt.Text.如果你想看到这些字段中的所有数据,这样的东西应该做你需要的：
@H_301_2@data2txt.Text = string.Empty;
datatxt.Text = string.Empty;
while (reader.Read())
{
data2txt.Text += reader.GetString("id");
datatxt.Text += reader.GetString("userId");
}
