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？
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 @R_301_198@.Data.@R_301_198@Client; namespace ReadDataFrom@R_301_198@ { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void button1_Click(object sender,EventArgs e) { string sql = " SELECT * FROM teacher "; @R_301_198@Connection con = new @R_301_198@Connection("host=localhost;user=root;password=859694;database=projekt;"); @R_301_198@Command cmd = new @R_301_198@Command(sql,con); con.Open(); @R_301_198@DataReader 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：
data2txt.Text = string.Empty;
datatxt.Text = string.Empty;
while (reader.Read())
{
data2txt.Text += reader.GetString("id");
datatxt.Text += reader.GetString("userId");
}
