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我正在處理Windows窗體項目，這需要我連接到訪問數據庫並瀏覽記錄，並添加/刪除它們。我在網上查看了一些教程，並認爲我正確地遵循了它們。無論如何，我可以添加一個新項目，並且它會在窗口中顯示正常，但在退出後，所有更改都將丟失，並且數據庫根本不會保存。C＃ - 無法將更改提交到Access數據庫
任何意見，將不勝感激。以下是我在按下按鈕時用於保存數據庫的代碼。爲了測試目的，我還在一些測試值中硬編碼。
private DataSet data;
private int inc;
private int MaxRows;
private OleDbConnection connect;
private OleDbDataAdapter da;
/**
* Autoloads the first item into our form's text fields.
*/
private void BookMgmt_Load(object sender, EventArgs e)
{
data = new DataSet();
connect = new System.Data.OleDb.OleDbConnection();
connect.ConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=.\\LibraryAppDB.accdb";
string Books = "SELECT * FROM Books";
da = new OleDbDataAdapter(Books, connect);
connect.Open();
da.Fill(data, "Books");
Navigate();
MaxRows = data.Tables["Books"].Rows.Count;
connect.Close();
connect.Dispose();
}
/**
*changes data within the array update form with current
*item's info
*/
private void Navigate()
{
ID = data.Tables["Books"].Rows[inc];
textBox1.Text = ID.ItemArray.GetValue(0).ToString();
textBox2.Text = ID.ItemArray.GetValue(1).ToString();
textBox3.Text = ID.ItemArray.GetValue(2).ToString();
textBox5.Text = ID.ItemArray.GetValue(3).ToString();
textBox6.Text = ID.ItemArray.GetValue(4).ToString();
textBox7.Text = ID.ItemArray.GetValue(7).ToString();
textBox8.Text = ID.ItemArray.GetValue(8).ToString();
textBox10.Text = ID.ItemArray.GetValue(5).ToString();
textBox11.Text = ID.ItemArray.GetValue(6).ToString();
}
/**
* Saves the new element added into our actual database
*/
private void saveButton_Click(object sender, EventArgs e)
{
OleDbCommandBuilder cb;
DataRow dRow = data.Tables["Books"].NewRow();
cb = new OleDbCommandBuilder(da);
dRow[0] = 11;
dRow[1] = "test";
dRow[2] = "test";
dRow[3] = "test";
dRow[5] = "test";
dRow[6] = "test";
dRow[7] = "test";
dRow[8] = "test";
data.Tables["Books"].Rows.Add(dRow);
data.AcceptChanges();
da.Update(data, "Books");
MaxRows = MaxRows + 1;
inc = MaxRows - 1;
Navigate();
MessageBox.Show("Entry Added", "Success!", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
/**
* Deletes the current item displayed on the form
*/
private void deleteButton_Click(object sender, EventArgs e)
{
OleDbCommandBuilder cb;
cb = new OleDbCommandBuilder(da);
if (textBox1.Text == "1")
{
}
else
{
data.Tables["Books"].Rows[inc].Delete();
this.MaxRows--;
this.inc = 0;
Navigate();
data.AcceptChanges()
da.Update(data, "Books");
MessageBox.Show("Gone");
}