C# 如何使用参数转换为正确的数据类型。使用SQL查询？
我试图将一些值保存到MS SQL中的数据表中，但数据类型有一些问题。我需要使用参数将这些值转换为正确的数据类型 这是我的桌子 这是我用来将值传递到数据库的代码，，我需要使用参数来转换数据，请帮助我这样做C# 如何使用参数转换为正确的数据类型。使用SQL查询？,c#,asp.net,sql,sql-server,C#,Asp.net,Sql,Sql Server,我试图将一些值保存到MS SQL中的数据表中，但数据类型有一些问题。我需要使用参数将这些值转换为正确的数据类型 这是我的桌子 这是我用来将值传递到数据库的代码，，我需要使用参数来转换数据，请帮助我这样做 private void InsertRec(StringCollection sc) { var conn = new SqlConnection(GetConnectionString()); var sb = new StringBuilder(st
private void InsertRec(StringCollection sc)
{
var conn = new SqlConnection(GetConnectionString());
var sb = new StringBuilder(string.Empty);
var splitItems = (string[])null;
foreach (string item in sc)
{
const string sqlStatement =
"INSERT INTO DEL_PurchasesLines1 (DealerCode,InvoiceNo,InvoiceDate,ItemIdentityCode,PurchasingPrice,DiscountRate,Discount,IssueMode,Qty,Total,ExpireDate,BatchNumber,UploadedStatus,InsertedDate,UploadedDate,Force,Principle,NewTotal) VALUES";
if (item.Contains(","))
{
splitItems = item.Split(",".ToCharArray());
sb.AppendFormat("{0}('{1}','{2}','{3}','{4}','{5}','{6}','{7}','{8}','{9}','{10}','{11}','{12}','{13}','{14}','{15}','{16}','{17}','{18}'); ", sqlStatement, splitItems[0], splitItems[1], splitItems[2], splitItems[3], splitItems[4], splitItems[5], splitItems[6], splitItems[7], splitItems[8], splitItems[9], splitItems[10], splitItems[11], splitItems[12], splitItems[13], splitItems[14], splitItems[15], splitItems[16], splitItems[17]);
}
}
try
{
conn.Open();
SqlCommand cmd = new SqlCommand(sb.ToString(), conn) { CommandType = CommandType.Text };
cmd.ExecuteNonQuery();
Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Script", "alert('Records Successfuly Saved!');", true);
}
catch (System.Data.SqlClient.SqlException ex)
{
string msg = "Insert Error:";
msg += ex.Message;
throw new Exception(msg);
}
finally
{
conn.Close();
}
}
protected void btnSaave_Click(object sender, EventArgs e)
{
int rowIndex = 0;
StringCollection sc = new StringCollection();
if (ViewState["CurrentData"] != null)
{
DataTable dtCurrentTable = (DataTable)ViewState["CurrentData"];
DataRow drCurrentRow = null;
if (dtCurrentTable.Rows.Count > 0)
{
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
var dtDealerCode = txtIDealerCode.Text;
var dtInvoiceNo = txtInvoiceNumber.Text;
var dtInvoiceDate = txtInvoiceDate.Text;
var dtItemIdentityCode = (Label)GridView1.Rows[rowIndex].Cells[1].FindControl("ItemCode");
var dtPurchasingPrice = (Label)GridView1.Rows[rowIndex].Cells[3].FindControl("UnitPrice");
var dtDiscountRate = txtDiscount.Text;
var dtDiscount = txtProductDiscount.Text;
var dtIssueMode = ddlIssueMode.SelectedValue;
var dtQty = (Label)GridView1.Rows[rowIndex].Cells[6].FindControl("Quantity");
var dtTotal = (Label)GridView1.FooterRow.FindControl("GetTotal");
var dtExpireDate = (Label)GridView1.Rows[rowIndex].Cells[5].FindControl("ExpiaryDate");
var dtBatchNumber = (Label)GridView1.Rows[rowIndex].Cells[4].FindControl("Batch");
var dtUploadedStatus = txtInvoiceDate.Text;
var dtInsertedDate = "1";
var dtUploadedDate = txtInvoiceDate.Text;
var dtForce = txtForce.Text;
var dtPrinciple = txtPrinciple.Text;
var NewTotal = (Label)GridView1.FooterRow.FindControl("GetQuantity");
sc.Add(dtDealerCode + "," + dtInvoiceNo + "," + dtInvoiceDate + "," + dtItemIdentityCode.Text + "," + dtPurchasingPrice.Text + "," + dtDiscountRate + "," + dtDiscount + "," + dtIssueMode + "," + dtQty.Text + "," + dtTotal.Text + "," + dtExpireDate + "," + dtBatchNumber.Text + "," + dtUploadedStatus + "," + dtInsertedDate + "," + dtUploadedDate + "," + dtForce + "," + dtPrinciple + "," + dtPrinciple + "," + NewTotal.Text);
rowIndex++;
}
InsertRec(sc);
}
}
}
这是一种令人讨厌的代码。我不知道您是否是编程新手，但您应该为此使用一个存储过程，该过程定义了14个左右需要作为参数传入的参数。这将指导您的代码，以便为参数化存储过程调用添加参数，每个参数都需要强类型，这将指导您对表的每个列值进行正确的转换。您还应该创建一个C类，该类将所有表列值定义为公共属性。请原谅VB.NET，但您会从这个简单的数据访问层D.A.L示例片段中了解到，UpdateOffer可以重命名为AddUpdateOffer，如果是更新，则可以通过将记录id传递给AddUpdate存储过程来检查记录是否存在，如果记录id为null，则存储过程知道执行insert else更新：
Public Class Offer
Public OfferID As Integer
Public PropertyID As Integer
Public AgentUserID As Integer
Public AgentName As String
Public BuyerUserID As Integer
Public BuyerName As String
Public BuyerType As String
Public Offer As Integer
Public NetOffer As Integer
Public ClosingCost As Integer
Public Allowances As Integer
Public RepairCosts As Integer
Public TotalCredits As Integer
Public OfferType As String
Public OfferDate As String
Public ProxyOffer As Integer
Public NetProxyOffer As Integer
Public ResultResponse As SUBMIT_OFFER_RESULT
'Public ResultAcceptedOffer As Integer
Public ResultAcceptedNetOffer As Integer
'Public ResultHighestOffer As Integer
Public ResultHighestNetOffer As Integer
Public Notifications As ArrayList = New ArrayList
Public EarnestMoneyDeposit As Integer
Public DownPayment As Integer
Public TypeOfFinancing As String
Public OfferStatus As String
Public Note As String
Public Visble As Boolean = True
Public OfferStatusChangedDate As DateTime
Public EstimatedCloseDate As DateTime
Public SourceType As String
Public Sub GetOffer(ByVal offerID As Integer)
Dim offerDB As OSP.DataAccess.OfferDB = New OSP.DataAccess.OfferDB
Dim rs As SqlClient.SqlDataReader
rs = offerDB.GetOffer(offerID)
Do While rs.Read
Me.OfferID = offerID
Me.PropertyID = rs("PROPERTY_ID")
Me.AgentUserID = rs("AGENT_USER_ID")
Me.BuyerUserID = IIf(IsDBNull(rs("BUYER_USER_ID")), 0, rs("BUYER_USER_ID"))
Me.Offer = rs("OFFER")
Me.NetOffer = rs("NET_OFFER")
Me.TotalCredits = rs("TOTAL_CREDITS")
Me.ProxyOffer = rs("PROXY_OFFER")
Me.OfferType = rs("OFFERTYPE")
Me.OfferDate = rs("OFFER_DATE")
Me.DownPayment = IIf(IsDBNull(rs("DOWN_PAYMENT")), 0, rs("DOWN_PAYMENT"))
Me.EarnestMoneyDeposit = IIf(IsDBNull(rs("EARNEST_MONEY_DEPOSIT")), 0, rs("EARNEST_MONEY_DEPOSIT"))
Me.TypeOfFinancing = rs("TYPE_OF_FINANCING")
Me.BuyerName = GlobalFunctions.DefaultString(rs("BUYER_NAME"))
Me.BuyerType = GlobalFunctions.DefaultString(rs("BUYER_TYPE"))
Me.AgentName = rs("OFFER_BY_NAME")
Me.OfferStatus = GlobalFunctions.DefaultString(rs("OFFER_STATUS"))
Me.Note = GlobalFunctions.DefaultString(rs("NOTE"))
Me.OfferStatusChangedDate = IIf(IsDBNull(rs("OFFER_STATUS_CHANGED_DATE")), Me.OfferStatusChangedDate, rs("OFFER_STATUS_CHANGED_DATE"))
Me.Visble = IIf(IsDBNull(rs("VISIBLE")), True, rs("VISIBLE"))
Me.EstimatedCloseDate = IIf(IsDBNull(rs("ESTIMATED_CLOSE_DATE")), DateTime.MinValue, rs("ESTIMATED_CLOSE_DATE"))
Loop
Try
If Not rs.IsClosed Then
rs.Close() : rs = Nothing
End If
If Not offerDB Is Nothing Then
offerDB.Dispose() : offerDB = Nothing
End If
Catch : End Try
End Sub
Public Function UpdateOffer() As Integer
Dim offerDB As OSP.DataAccess.OfferDB = New OSP.DataAccess.OfferDB
Return offerDB.UpdateOffer(Me)
End Function
End Class
Public Class OfferDB
Implements System.IDisposable
Dim db As SQLDatabase
Public Sub New()
db = New SQLDatabase(GlobalSettings.GetDefaultConnectionString)
End Sub
Public Sub Dispose() Implements System.IDisposable.Dispose
If Not db Is Nothing Then
db = Nothing
End If
End Sub
Public Function GetOffer(ByVal offerID As Integer) As SqlClient.SqlDataReader
Dim dbCommand As DbCommand = db.GetStoredProcCommand("OSP_GET_OFFER")
db.AddInParameter(dbCommand, "@OFFER_ID", SqlDbType.Int, offerID)
Try
Return db.ExecuteReader(dbCommand)
Catch ex As Exception
Dim rethrow As Boolean = ExceptionPolicy.HandleException(ex, "EXCEPTION_CRITICAL")
If (rethrow) Then
Throw
End If
End Try
End Function
Public Function UpdateOffer(ByVal offer As OSP.Offer) As Integer
Dim dbCommand As DbCommand = db.GetStoredProcCommand("OSP_UPDATE_OFFER")
db.AddInParameter(dbCommand, "@OFFER_ID", SqlDbType.Int, offer.OfferID)
db.AddInParameter(dbCommand, "@BUYER_USER_ID", SqlDbType.Int, offer.BuyerUserID)
db.AddInParameter(dbCommand, "@OFFER", SqlDbType.Int, offer.Offer)
db.AddInParameter(dbCommand, "@TOTAL_CREDITS", SqlDbType.Int, offer.TotalCredits)
db.AddInParameter(dbCommand, "@OFFER_TYPE", SqlDbType.VarChar, offer.OfferType)
db.AddInParameter(dbCommand, "@OFFER_DATE", SqlDbType.VarChar, offer.OfferDate)
db.AddInParameter(dbCommand, "@TYPE_OF_FINANCING", SqlDbType.VarChar, offer.TypeOfFinancing)
db.AddInParameter(dbCommand, "@DOWN_PAYMENT", SqlDbType.Int, offer.DownPayment)
db.AddInParameter(dbCommand, "@EARNEST_MONEY_DEPOSIT", SqlDbType.Int, offer.EarnestMoneyDeposit)
db.AddInParameter(dbCommand, "@OFFER_STATUS", SqlDbType.VarChar, offer.OfferStatus)
db.AddInParameter(dbCommand, "@NOTE", SqlDbType.VarChar, offer.Note)
If Not offer.OfferStatusChangedDate = DateTime.MinValue Then
db.AddInParameter(dbCommand, "@OFFER_STATUS_CHANGED_DATE", SqlDbType.DateTime, offer.OfferStatusChangedDate)
End If
Try
Return db.ExecuteScalar(dbCommand)
Catch ex As Exception
Dim rethrow As Boolean = ExceptionPolicy.HandleException(ex, "EXCEPTION_CRITICAL")
If (rethrow) Then
Throw
End If
End Try
End Function
End Class
正确的方法是构建一个方法，该方法通过为每个项提供一个参数或通过一个类类型来请求它期望的特定值，即：
private void InsertRec(DEL_PurchasesLines1 lineToInsert)
private void InsertRec(string DealerCode,string InvoiceNo,DateTime InvoiceDate,
string ItemIdentityCode,decimal PurchasingPrice, decimal DiscountRate,
decimal Discount,string IssueMode,decimal Qty,decimal Total,
DateTime ExpireDate,string BatchNumber,string UploadedStatus,
string InsertedDate,DateTime UploadedDate,string Force,
decimal Principle,decimal NewTotal)
protected void btnSave_Click(object sender, EventArgs e)
{
if (ViewState["CurrentData"] == null) return;
DataTable dtCurrentTable = (DataTable)ViewState["CurrentData"];
if (dtCurrentTable.Rows.Count == 0) return;
int rowIndex = 0;
var dtDealerCode = txtIDealerCode.Text;
var dtInvoiceNo = txtInvoiceNumber.Text;
var dtInvoiceDate = DateTime.Parse(txtInvoiceDate.Text);
var dtDiscountRate = decimal.Parse(txtDiscount.Text);
var dtDiscount = decimal.Parse(txtProductDiscount.Text);
var dtIssueMode = ddlIssueMode.SelectedValue;
var dtUploadedStatus = DateTime.Parse(txtInvoiceDate.Text);
var dtInsertedDate = "1"; //Really?
var dtUploadedDate = DateTime.Parse(txtInvoiceDate.Text);
var dtForce = txtForce.Text;
var dtPrinciple = decimal.Parse(txtPrinciple.Text);
for (int i = 1; i <= dtCurrentTable.Rows.Count; i++)
{
var dtItemIdentityCode = (Label)GridView1.Rows[rowIndex].Cells[1].FindControl("ItemCode");
var dtPurchasingPrice = decimal.Parse((Label)GridView1.Rows[rowIndex].Cells[3].FindControl("UnitPrice"));
var dtQty = decimal.Parse((Label)GridView1.Rows[rowIndex].Cells[6].FindControl("Quantity"));
var dtTotal = decimal.Parse((Label)GridView1.FooterRow.FindControl("GetTotal"));
var dtExpireDate = DateTime.Parse((Label)GridView1.Rows[rowIndex].Cells[5].FindControl("ExpiaryDate"));
var dtBatchNumber = (Label)GridView1.Rows[rowIndex].Cells[4].FindControl("Batch");
var NewTotal = decimal.Parse((Label)GridView1.FooterRow.FindControl("GetQuantity"));
InsertRec(dtDealerCode,dtInvoiceNo,dtInvoiceDate,dtItemIdentityCode,
dtPurchasingPrice,dtDiscountRate,dtDiscount,dtIssueMode,dtQty,
dtTotal,dtExpireDate,dtBatchNumber,dtUploadedStatus,dtInsertedDate,
dtUploadedDate,dtForce,dtPrinciple,NewTotal);
rowIndex++;
}
}
private void InsertRec(string DealerCode,string InvoiceNo,DateTime InvoiceDate,
string ItemIdentityCode,decimal PurchasingPrice, decimal DiscountRate,
decimal Discount,string IssueMode,decimal Qty,decimal Total,
DateTime ExpireDate,string BatchNumber,string UploadedStatus,
string InsertedDate,DateTime UploadedDate,string Force,
decimal Principle,decimal NewTotal)
{
const string sqlStatement =
"INSERT INTO DEL_PurchasesLines1 (" +
"DealerCode,InvoiceNo,InvoiceDate,ItemIdentityCode,PurchasingPrice,DiscountRate,Discount,IssueMode,Qty,Total,ExpireDate,BatchNumber,UploadedStatus,InsertedDate,UploadedDate,Force,Principle,NewTotal" +
") VALUES (" +
"@DealerCode, @InvoiceNo, @InvoiceDate, @ItemIdentityCode, @PurchasingPrice, @DiscountRate, @Discount, @IssueMode, @Qty, @Total, @ExpireDate, @BatchNumber, @UploadSTatus, @InsertedDate, @UploadedDate, @Force, @Principle, @NewTotal" +
")";
using (conn = new SqlConnection(GetConnectionString())
using (cmd = new SqlCommand(sqlStatement, conn))
{
cmd.Parameters.Add("@DealerCode", SqlDbType.NVarChar, 10).Value = DealerCode;
cmd.Parameters.Add("@InvoiceNo", SqlDbType.NVarChar, 10).Value = InvoiceNo;
cmd.Parameters.Add("@InvoiceDate", SqlDbType.DateTime).Value = InvoiceDate;
cmd.Parameters.Add("@ItemIdentityCode", SqlDbType.NVarChar, 10).Value = ItemIdentityCode;
cmd.Parameters.Add("@PurchasingPrice", SqlDbType.Decimal).Value = PurchasingPrice;
cmd.Parameters.Add("@DiscountRate", SqlDbType.Decimal).Value = DiscountRate;
//...
conn.Open();
cmd.ExecuteNonQuery();
}
Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "Script", "alert('Records Successfuly Saved!');", true);
}
private void InsertRec(DEL_PurchasesLines1[] linesToInsert)
{
const string sqlBase =
"INSERT INTO DEL_PurchasesLines1 (" +
"(DealerCode,InvoiceNo,InvoiceDate,ItemIdentityCode,PurchasingPrice,DiscountRate,Discount,IssueMode,Qty,Total,ExpireDate,BatchNumber,UploadedStatus,InsertedDate,UploadedDate,Force,Principle,NewTotal)" +
" VALUES ";
const string valueBase =
"{0}(@DealerCode{1}, @InvoiceNo{1}, @InvoiceDate{1}, @ItemIdentityCode{1}, @PurchasingPrice{1}, @DiscountRate{1}, @Discount{1}, @IssueMode{1}, @Qty{1}, @Total{1}, @ExpireDate{1}, @BatchNumber{1}, @UploadSTatus{1}, @InsertedDate{1}, @UploadedDate{1}, @Force{1}, @Principle{1}, @NewTotal{1})";
var sb = new StringBuilder(sqlBase);
if (DEL_PurchasesLines1.Length > 1) sb.Append("(")
var delimiter = "";
for (int i = 0;i<DEL_PurchasesLines1.Length;i++)
{
sb.AppendFormat(valueBase, i, delimiter);
delimiter = ",";
}
if (DEL_PurchasesLines1.Length > 1) sb.Append(")")
using (conn = new SqlConnection(GetConnectionString())
using (cmd = new SqlCommand(sqlStatement, conn))
{
for (int i = 0;i<DEL_PurchasesLines1.Length;i++)
{
cmd.Parameters.Add("@DealerCode" + i, SqlDbType.NVarChar, 10).Value = linesToInsert[i].DealerCode;
cmd.Parameters.Add("@InvoiceNo" + i, SqlDbType.NVarChar, 10).Value = linesToInsert[i].InvoiceNo;
cmd.Parameters.Add("@InvoiceDate + i", SqlDbType.DateTime).Value = linesToInsert[i].InvoiceDate;
cmd.Parameters.Add("@ItemIdentityCode" + i, SqlDbType.NVarChar, 10).Value = linesToInsert[i].ItemIdentityCode;
cmd.Parameters.Add("@PurchasingPrice" + i, SqlDbType.Decimal).Value = linesToInsert[i].PurchasingPrice;
cmd.Parameters.Add("@DiscountRate" + i, SqlDbType.Decimal).Value = linesToInsert[i].DiscountRate;
//...
}
conn.Open();
cmd.ExecuteNonQuery();
}
}