我正在通過Windows窗體向我的數據庫添加記錄。但是,當我添加新記錄時,它不會更新,直到我關閉該應用程序,然後重新開始。即使我想我告訴它更新(Im obv不!!)以窗體形式更新數據庫和c#
我需要一個新的varibale來更新數據庫嗎?我有點卡住了。
編輯:在這所有的代碼..
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 System.Data.OleDb;
namespace MediaManagementSystem
{
public partial class AddMedia : Form
{
//database var
OleDbConnection m_cnADONetConnection = new OleDbConnection();
OleDbDataAdapter m_daDataAdapter;
OleDbDataAdapter m_cbCommandBuilder;
DataTable m_dtMedia = new DataTable();
int m_rowPosition = 0;
public AddMedia()
{
InitializeComponent();
}
private void BrowseButton_Click(object sender, EventArgs e)
{
//load up file dialog and find media
if (addFileDialog.ShowDialog() == DialogResult.OK)
{
//add media file name to file path text box
txtFilePath.Text = addFileDialog.FileName;
}
}
private void CancelButton_Click(object sender, EventArgs e)
{
this.Close();
}
private void AddButton_Click(object sender, EventArgs e)
{
//add the new record to the database
DataRow drNewRow = m_dtMedia.NewRow();
drNewRow["FilePath"] = txtFilePath.Text;
drNewRow["Subject"] = txtSubject.Text;
drNewRow["Title"] = txtTitle.Text;
drNewRow["Keywords"] = txtKeywords.Text;
drNewRow["MediaType"] = AddComboBox.Text;
m_dtMedia.Rows.Add(drNewRow);
m_daDataAdapter.Update(m_dtMedia);
m_rowPosition = m_dtMedia.Rows.Count - 1;
this.ShowCurrentRecord();
this.Close();
}
private void AddMedia_Load(object sender, EventArgs e)
{
//link to the database and conect to database
m_cnADONetConnection.ConnectionString = @"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Users\Max\Documents\Visual Studio 2010\Projects\MediaManagementSystem\MediaManagementSystem\bin\Debug\MediaDB.mdb";
m_cnADONetConnection.Open();
OleDbConnection objConnection = new OleDbConnection(m_cnADONetConnection.ConnectionString);
m_daDataAdapter = new OleDbDataAdapter("Select * From Media", m_cnADONetConnection);
OleDbCommandBuilder m_cbCommandBuilder = new OleDbCommandBuilder(m_daDataAdapter);
m_daDataAdapter.Fill(m_dtMedia);
m_daDataAdapter.Update(m_dtMedia);
}
public void ShowCurrentRecord()
{
m_daDataAdapter.Update(m_dtMedia);
if (m_dtMedia.Rows.Count == 0)
{
txtFilePath.Text = "";
txtSubject.Text = "";
txtTitle.Text = "";
txtKeywords.Text = "";
AddComboBox.Text = "";
return;
}
txtFilePath.Text = m_dtMedia.Rows[m_rowPosition]["FilePath"].ToString();
txtSubject.Text = m_dtMedia.Rows[m_rowPosition]["Subject"].ToString();
txtTitle.Text = m_dtMedia.Rows[m_rowPosition]["Title"].ToString();
txtKeywords.Text = m_dtMedia.Rows[m_rowPosition]["Keywords"].ToString();
AddComboBox.Text = m_dtMedia.Rows[m_rowPosition]["MediaType"].ToString();
}
}
}
「它不更新直到我關閉應用程序,然後重新開始「所以你關閉它並重新打開它,你會看到你的改變? – banging
旁註:你打電話給'm_daDataAdapter.Update(m_dtMedia);'當你AddButton_Click時,調用兩次# – banging
是的,這是正確的 –