C# 无法将空值插入表Orders
我在将记录插入数据库时遇到问题, 错误为:“无法将值NULL插入到“OrderNo”列、表“Receipt.dbo.Orders”中;列不允许为NULL。插入失败。然后语句已终止”,但当我检查代码时,似乎找不到任何错误。有人能帮我吗?提前感谢您: 以下是我的代码集: -用于保存销售订单-C# 无法将空值插入表Orders,c#,sql,C#,Sql,我在将记录插入数据库时遇到问题, 错误为:“无法将值NULL插入到“OrderNo”列、表“Receipt.dbo.Orders”中;列不允许为NULL。插入失败。然后语句已终止”,但当我检查代码时,似乎找不到任何错误。有人能帮我吗?提前感谢您: 以下是我的代码集: -用于保存销售订单- private void SaveSalesOrder(string status) { int nOrder = 0;
private void SaveSalesOrder(string status)
{
int nOrder = 0;
CloseConnection();
OpenConnection();
trnOrder = cn.BeginTransaction();
SqlCommand cmdInsert = new SqlCommand();
try
{
cmdInsert.Connection = cn;
cmdInsert.Transaction = trnOrder;
cmdInsert.CommandType = CommandType.Text;
cmdInsert.CommandText =
"INSERT INTO Orders " +
"(OrderDate, CustomerNo, CustomerName, CustomerAddress, PurchaseOrderNo, AgentName, Status) " +
"VALUES ('" +
dtpOrderDate.Value.Date.ToString() + "', '" +
txtCustomerNo.Text + "', '" +
txtCustomerName.Text + "', '" +
txtCustomerAddress.Text + "', '" +
txtPONo.Text + "', '" +
cboAgentName.Text + "', '" +
status + "'); " +
"SELECT TOP 1 OrderNo FROM Orders " +
"ORDER BY OrderNo DESC;";
nOrder = Convert.ToInt16(cmdInsert.ExecuteScalar().ToString());
for (int nRow = 0;
nRow <= dsDetail.Tables["OrderDetails"].Rows.Count - 1;
nRow++)
{
double dQuantity = Convert.ToDouble(dsDetail.Tables["OrderDetails"].
Rows[nRow]["Quantity"].ToString());
string strUnit = dsDetail.Tables["OrderDetails"].
Rows[nRow]["Unit"].ToString();
int nProductNo = Convert.ToInt16(dsDetail.Tables["OrderDetails"].
Rows[nRow]["ProductNo"].ToString());
string strProductName = dsDetail.Tables["OrderDetails"].
Rows[nRow]["ProductName"].ToString();
string strProductSize = dsDetail.Tables["OrderDetails"].
Rows[nRow]["ProductSize"].ToString();
string strPackagingInside = dsDetail.Tables["OrderDetails"].
Rows[nRow]["PackagingInside"].ToString();
double dSellingDiscount = Convert.ToDouble(dsDetail.Tables["OrderDetails"].
Rows[nRow]["SellingDiscount"].ToString());
double dSellingPrice = Convert.ToDouble(dsDetail.Tables["OrderDetails"].
Rows[nRow]["SellingPrice"].ToString());
double nAmount = Convert.ToDouble(dsDetail.Tables["OrderDetails"].
Rows[nRow]["Amount"].ToString());
SqlCommand cmdInsertDetail = new SqlCommand();
cmdInsertDetail.Connection = cn;
cmdInsertDetail.Transaction = trnOrder;
cmdInsertDetail.CommandType = CommandType.Text;
cmdInsertDetail.CommandText =
"INSERT INTO OrderDetails " +
"(OrderNo, PackagingOutside, Quantity, Unit, ProductNo, ProductName, " +
"ProductSize, PackagingInside, SellingDiscount, SellingPrice, Amount) " +
"VALUES ('" +
nOrder + "', '" +
dPackagingOutside + "', '" +
dQuantity + "', '" +
strUnit + "', '" +
nProductNo + "', '" +
strProductName + "', '" +
strProductSize + "', '" +
strPackagingInside + "', '" +
dSellingDiscount + "', '" +
dSellingPrice + "', '" +
nAmount + "')";
cmdInsertDetail.ExecuteNonQuery();
}
trnOrder.Commit();
if (status == "OK")
{
MessageBox.Show("Transaction has been saved!", "Success",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
MessageBox.Show("Transaction has been voided!", "Void Transaction",
MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
catch (SqlException ex)
{
trnOrder.Rollback();
MessageBox.Show(ex.Message);
}
finally
{
cn.Close();
}
}
private void btnSave_Click(object sender, EventArgs e)
{
if (txtCustomerNo.Text == "")
{
MessageBox.Show("Please select a customer first.", "Empty", MessageBoxButtons.OK, MessageBoxIcon.Error);
btnSearchCustomer.Focus();
return;
}
if (grdDetails.Rows.Count < 1)
{
MessageBox.Show("Please select a product first.", "Empty",
MessageBoxButtons.OK, MessageBoxIcon.Error);
btnProductSearch.Focus();
return;
}
SaveSalesOrder("OK");
groupCustomer(false);
groupProduct(false);
CSalesInv.EnableDisable(this, false);
CloseConnection();
InitializeOrder();
lblTotal.Text = "";
}
private void SaveSalesOrder(字符串状态)
{
int-nOrder=0;
CloseConnection();
OpenConnection();
trnOrder=cn.BeginTransaction();
SqlCommand cmdInsert=new SqlCommand();
尝试
{
cmdInsert.Connection=cn;
cmdInsert.Transaction=trnOrder;
cmdInsert.CommandType=CommandType.Text;
cmdInsert.CommandText=
“插入订单”+
(订单日期、客户编号、客户名称、客户地址、采购订单号、代理名称、状态)+
“值('”+
dtpOrderDate.Value.Date.ToString()+“,”+
txtCustomerNo.Text+“,”+
txtCustomerName.Text+“,”+
txtCustomerAddress.Text+“,”+
txtPONo.Text+“,”+
cboAgentName.Text+“,”+
状态+“')+
“从订单中选择前1个订单号”+
“按订单订购无需说明;”;
nOrder=Convert.ToInt16(cmdInsert.ExecuteScalar().ToString());
对于(int nRow=0;
nRow您没有在查询中指定OrderNo。除非这是一个IDENTITY
字段,否则它不会为您自动递增
你可以做两件事:
- 检查数据库并确保
OrderId
设置为允许空值
- 将Orderid设置为标识列
您可能还想使用SQL参数化查询
来防止SQL注入
cmdInsertDetail.CommandText = "INSERT INTO YourTable (CustomerNumber) VALUES (@CustomerNo)";
cmdInsertDetail.Parameters.AddWithValue("@CustomerNo", txtCustomerNo.Text);
这也比构建随机的SQL
字符串更有效。错误是从数据库生成的。数据库中的OrderNo列被设置为不允许NULL。我猜想您需要某种唯一的ID,但勾选了“No NULLs”
您使用的是什么数据库?一个非常酷的想法是,您可以返回标识号,让您知道该行已添加到哪个行号上。是的,如果您希望在某些情况下缺少订单号,则需要将订单号设置为允许表中为空
在这里,我将标识号(OrderID)添加到要返回的输出的标签中,这告诉我添加行时它在哪一行:(只是尝试帮助)
您可以发布订单表设计的屏幕截图吗?很可能它设置为不允许nullsTry手动在数据库中插入空值。检查它的主键!!您可能想更改您的OrderNo
列以具有标识关系(如果它是Microsoft SQL Server),或beauto_increment
如果是MySQL,请研究“sql注入”和“参数”是的,OrderNo在主键中,这就是为什么它被设置为不允许空的原因。哪个供应商?MySQL、Oracle、Microsoft?nOrder=Convert.ToInt16(cmdInsert.ExecuteScalar().ToString())我想诺德不能给空值。
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"', " + " '" + emp.SignedName +
"', " + " '" + emp.SignedDate + "') SELECT SCOPE_IDENTITY(); ");
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