如何将数据从MySQL放到C＃ [英] how to put data from MySQL to C#
问题描述
嘿我已经完成了搜索方法，我想做的就是将数据放入文本框。
例如，我需要使用ID从数据库中提取数据并在所需文本框中设置其他信息，用户在文本框中提供ID。
感谢您的帮助我...... :)）GOD BLESS！
我的代码.....
hey I'm already done for the searching method and all i want to do is to put the data into the textbox.
For example I need pull data from DB using ID and set other info in required text box, ID is provided by user in a Text Box.
thanks for helping me.. :)) GOD BLESS!
my code.....
使用System;
使用System.Collections.Generic ;
使用System.ComponentModel;
使用System.Data;
使用System.Drawing;
使用System .Linq;
使用System.Text;
使用System.Windows.Forms;
使用MySql.Data.MySqlClient;
命名空间WindowsFormsApplication17.Forms
{
公共部分类Form7：表格
{
公共Form7 （）
{
InitializeComponent（）;
}
private void btnAdd_Click（object sender，EventArgs e）
{
string input = txtStudID.Text.Trim（ ）;
string conn =server = localhost; user = root; password = 1; database = record;;
MySqlConnection myconn = new MySqlConnection（conn）;
string sql =SELECT`CudeteID` FROM`Information` WHERE`CandryID` ='+ input +';;
MySqlDataAdapter da = new MySqlDataAdapter（sql， myconn）;
MySqlDataReader阅读器;
DataTable dt = new DataTable（）;
da.Fill（dt）;
if（dt.Rows.Count == 0）
{
MessageBox.Show （输入+不存在。，不存在）;
txtStudID.Focus（）;
txtStudID.Text =;
}
其他
{
//这对于将显示列数据的文本框..
txtStudName.Text = dt.Columns [0] +;
txtAdd.Text = dt.Columns +address;
txtContact.Text = dt.Columns +Contact;
}
}
private void btnClose_Click（object sender，EventArgs e）
{
Form1 form1 = new Form1（）;
form1.Show（）;
this.Hide（）;
}
}
}
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 WindowsFormsApplication17.Forms
{
public partial class Form7 : Form
{
public Form7()
{
InitializeComponent();
}
private void btnAdd_Click(object sender, EventArgs e)
{
string input = txtStudID.Text.Trim();
string conn = "server=localhost;user=root;password=1;database=record;";
MySqlConnection myconn = new MySqlConnection(conn);
string sql = "SELECT `StudentID` FROM `Information` WHERE `StudentID` = '" + input + "';";
MySqlDataAdapter da = new MySqlDataAdapter(sql, myconn);
MySqlDataReader reader;
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count == 0)
{
MessageBox.Show(input + " does not exist.", "Not Exists");
txtStudID.Focus();
txtStudID.Text = "";
}
else
{
//this for textboxes that will display the data from column..
txtStudName.Text = dt.Columns[0] + "";
txtAdd.Text = dt.Columns + "address";
txtContact.Text = dt.Columns + "Contact";
}
}
private void btnClose_Click(object sender, EventArgs e)
{
Form1 form1 = new Form1();
form1.Show();
this.Hide();
}
}
}
推荐答案
Hi,
txtAdd.Text = dt.Columns + "address";
txtContact.Text = dt.Columns + "Contact";
这部分对我来说有点混乱。
你应该写代码这样，
This part is bit confusing for me apart from that.
you should write the code in this way,
string input = txtStudID.Text.Trim();
// This a very bad thing to put Connection string with in the code.
string conn = "server=localhost;user=root;password=1;database=record;";
MySqlConnection myconn = new MySqlConnection(conn);
// Change Field Name as you have in your Table
string sql = "SELECT `StudentAdd`,`StudentName`,`StudentContact` FROM `Information` WHERE `StudentID` = '" + input + "';";
MySqlDataAdapter da = new MySqlDataAdapter(sql, myconn);
MySqlDataReader reader;
DataTable dt = new DataTable();
da.Fill(dt);
if (dt.Rows.Count == 0)
{
MessageBox.Show(input + " does not exist.", "Not Exists");
txtStudID.Focus();
txtStudID.Text = "";
}
else
{
//this for textboxes that will display the data in column..
// I guess that not data contains null
txtStudName.Text = dt.Rows[0]["StudentName"].ToString() + "";
txtAdd.Text = dt.Rows[0]["StudentAdd"].ToString() + "address";
txtContact.Text = dt.Rows[0]["StudentContact"].ToString() + "Contact";
}
这篇关于如何将数据从MySQL放到C＃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
