[英]Error in displaying MS Access Database in C#
我想我在這里是一個不包含很多細節的人,對此我感到很抱歉,所以這次我將嘗試對我的問題提供更多信息。
注意:如果您要問為什么我不使用異常處理,那是因為我想在處理異常之前使用代碼。
最近,我們被教導使用MS Access創建基本數據庫。 所以我的問題是這個。 使用以下代碼將我的數據庫顯示到我的listView中:
private void Form1_Load(object sender, EventArgs e)
{
DataSet ds = new DataSet();
System.Data.OleDb.OleDbConnection con = new System.Data.OleDb.OleDbConnection("Provider=Microsoft.ACE.Oledb.12.0;Data Source =AssetManagement.accdb");//accessItems is the database file
System.Data.OleDb.OleDbDataAdapter adpt = new System.Data.OleDb.OleDbDataAdapter("select * from tbl_Assets", con);
adpt.Fill(ds);
DataTable table = ds.Tables[0];
foreach (DataRow row in table.Rows)
{
lstViewListOfRooms.Items.Add(row[1].ToString()).SubItems.Add(row[2].ToString());
for (int i = 0; i < lstViewListOfRooms.Items.Count; i++)
{
lstViewListOfRooms.Items[i].SubItems.Add(row[3].ToString());
lstViewListOfRooms.Items[i].SubItems.Add(row[4].ToString());
}
}
這用於以不同的形式為我的數據庫添加新項目:
private void btnSaveAddAsset_Click(object sender, EventArgs e)
{
if (txtAddFloor.Text == "" || txtAddRoom.Text == "" || string.IsNullOrWhiteSpace(txtAddFloor.Text) == true || string.IsNullOrWhiteSpace(txtAddRoom.Text) == true)
{
MessageBox.Show("Please enter valid information", "", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
}
else
{
ths.lstViewListOfRooms.Items.Add(txtAddFloor.Text).SubItems.Add(txtAddRoom.Text);
for (int i = 0; i < ths.lstViewListOfRooms.Items.Count; i++)
{
String date = "dd/MM/yyyy - HH:mm:ss";
ths.lstViewListOfRooms.Items[i].SubItems.Add(txtAddDescriptionDetail.Text);
ths.lstViewListOfRooms.Items[i].SubItems.Add(DateTime.Now.ToString(date));
con = new OleDbConnection("Provider=Microsoft.ACE.Oledb.12.0;Data Source =AssetManagement.accdb");
Ds = new DataSet();
string query = "INSERT INTO tbl_Assets(asset_floor, asset_room, asset_description, asset_createdOn)" + " VALUES (" + txtAddFloor.Text + "," + txtAddRoom.Text + ", '" + txtAddDescriptionDetail.Text + "' , '" + DateTime.Now.ToString(date) + "'" + ") ";
con.Open();
Da = new OleDbDataAdapter(query, con);
Da.Fill(Ds, "tbl_Assets");
con.Close();
this.Close();
}
}
}
每次保存時, 都會由於以下代碼而再次添加每個現有房間 : for (int i = 0; i < ths.lstViewListOfRooms.Items.Count; i++)
您應該只插入新的,並更新(如果需要)現有的。 此代碼將執行以下操作:
private void btnSaveAddAsset_Click(object sender, EventArgs e)
{
if (txtAddFloor.Text == "" || txtAddRoom.Text == "" || string.IsNullOrWhiteSpace(txtAddFloor.Text) == true || string.IsNullOrWhiteSpace(txtAddRoom.Text) == true)
{
MessageBox.Show("Please enter valid information", "", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
}
else
{
ths.lstViewListOfRooms.Items.Add(txtAddFloor.Text).SubItems.Add(txtAddRoom.Text);
String date = "dd/MM/yyyy - HH:mm:ss";
ths.lstViewListOfRooms.Items[lstViewListOfRooms.Items.Count - 1].SubItems.Add(txtAddDescriptionDetail.Text);
ths.lstViewListOfRooms.Items[lstViewListOfRooms.Items.Count - 1].SubItems.Add(DateTime.Now.ToString(date));
con = new OleDbConnection("Provider=Microsoft.ACE.Oledb.12.0;Data Source =AssetManagement.accdb");
Ds = new DataSet();
string query = "INSERT INTO tbl_Assets(asset_floor, asset_room, asset_description, asset_createdOn)" + " VALUES (" + txtAddFloor.Text + "," + txtAddRoom.Text + ", '" + txtAddDescriptionDetail.Text + "' , '" + DateTime.Now.ToString(date) + "'" + ") ";
con.Open();
Da = new OleDbDataAdapter(query, con);
Da.Fill(Ds, "tbl_Assets");
con.Close();
this.Close();
}
}
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