0
我创建一个系统，它允许用户输入文本框控件10点的数据，然后一起保存在数据库中。但是，这个错误让我有一段时间的股票，我不知道我哪里错了。有人可以帮助我吗？请善待并提前致谢。也随时编辑我的问题。错误：需要的ExecuteNonQuery开放和可用的连接
这里是我的代码：
private void btnAdd_Click(object sender, EventArgs e)
{
DateTime getdate = DateTime.Now;
String time = getdate.ToString("F");
try
{
con.Open();
var rows = new[]
{
new {Item = txtItem.Text, Product = txtProduct.Text, Quantity = txtQuantity.Text},
new {Item = txtItem2.Text, Product = txtProduct2.Text, Quantity = txtQuantity2.Text},
new {Item = txtItem3.Text, Product = txtProduct3.Text, Quantity = txtQuantity3.Text},
new {Item = txtItem4.Text, Product = txtProduct4.Text, Quantity = txtQuantity4.Text},
new {Item = txtItem5.Text, Product = txtProduct5.Text, Quantity = txtQuantity5.Text},
new {Item = txtItem6.Text, Product = txtProduct6.Text, Quantity = txtQuantity6.Text},
new {Item = txtItem7.Text, Product = txtProduct7.Text, Quantity = txtQuantity7.Text},
new {Item = txtItem8.Text, Product = txtProduct8.Text, Quantity = txtQuantity8.Text},
new {Item = txtItem9.Text, Product = txtProduct9.Text, Quantity = txtQuantity9.Text},
new {Item = txtItem10.Text, Product = txtProduct10.Text, Quantity = txtQuantity10.Text}
};
foreach (var row in rows)//Check if ItemCode exist
{
if (!String.IsNullOrEmpty(row.Item))
{
OleDbCommand command = new OleDbCommand(@"Select * from TblInventory where ItemCode='" + txtItem.Text + "'");
command.Connection = con;
command.Parameters.AddWithValue("itemcode", txtItem.Text);
OleDbDataReader reader = command.ExecuteReader();
if (reader.Read())
{
OleDbCommand cmd = new OleDbCommand(@"Update TblInventory set Quantity = Quantity + @Quantity WHERE ItemCode = @itemcode");
cmd.Connection = con;
cmd.Parameters.AddWithValue("@Quantity", Convert.ToInt32(txtQuantity.Text));
txtProduct.Text = reader["ProductName"].ToString();
cmd.Parameters.AddWithValue("@itemcode", txtItem.Text);
cmd.Parameters.AddWithValue("@DateAndTime", time);
cmd.ExecuteNonQuery();// HERE <<<
MessageBox.Show("You added " + txtQuantity.Text + " " + txtProduct.Text, "Existing Item");
}
}
else //Add new Data if Item Code is not exit;
{
var rows2 = new[]
{
new {Item = txtItem.Text, Product = txtProduct.Text, Quantity = txtQuantity.Text},
new {Item = txtItem2.Text, Product = txtProduct2.Text, Quantity = txtQuantity2.Text},
new {Item = txtItem3.Text, Product = txtProduct3.Text, Quantity = txtQuantity3.Text},
new {Item = txtItem4.Text, Product = txtProduct4.Text, Quantity = txtQuantity4.Text},
new {Item = txtItem5.Text, Product = txtProduct5.Text, Quantity = txtQuantity5.Text},
new {Item = txtItem6.Text, Product = txtProduct6.Text, Quantity = txtQuantity6.Text},
new {Item = txtItem7.Text, Product = txtProduct7.Text, Quantity = txtQuantity7.Text},
new {Item = txtItem8.Text, Product = txtProduct8.Text, Quantity = txtQuantity8.Text},
new {Item = txtItem9.Text, Product = txtProduct9.Text, Quantity = txtQuantity9.Text},
new {Item = txtItem10.Text, Product = txtProduct10.Text, Quantity = txtQuantity10.Text}
};
foreach (var row2 in rows)
{
if (!String.IsNullOrEmpty(row2.Item) && !String.IsNullOrEmpty(row2.Product) && !String.IsNullOrEmpty(row2.Quantity))
{
OleDbCommand cmdInsert = new OleDbCommand(
@"insert into TblInventory (ItemCode,ProductName,Quantity,DateAndTime)values(@ItemCode,@ProductName,@Quantity,@DateAndTime)");
cmdInsert.Connection = con;
cmdInsert.Parameters.AddWithValue("ItemCode", row2.Item);
cmdInsert.Parameters.AddWithValue("ProductName", row2.Product);
cmdInsert.Parameters.AddWithValue("Quantity", row2.Quantity.ToString());
cmdInsert.Parameters.AddWithValue("DateAndTime", DateTime.Now);
cmdInsert.ExecuteNonQuery(); HERE <<<
MessageBox.Show("You added " + row.Quantity + " " + row.Product, "New Item");
}
}
}
showGrid2();
con.Close();
clear();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
该行中显示出了错误？我的意思是哪个'ExecuteNonQuery' –
这两个命令都显示错误先生。在''Update Condition''上，MessageBox显示在错误在'else condition'上弹出之前，没有消息框只显示错误。 –