c# - SqlCommand AddWithValue not working properly -


I have the following block of code ... fieldCount always returns 0.

I suspect that AddWithValue is not properly writing SELECT statement ... no idea why? As you can see from the watch, they are valid values ​​( field , fieldId ). 

  Public Zero deleteRows (string table, string field, string field id) {int fieldCount; (SqlCommand command = new SqlCommand (String.Format ("SELECT COUNT (*) FROM {0} WHERE @field IN (@fieldId)",), {command.Parameters.AddWithValue ("@ field", using ) Farm); order. Parameter. Edvat Value ("@field ID", Field ID); FieldCount = (int) command. Exclute form (); } If (field count> 0) {  
 debug screen   
 
 
 There are two errors in your code:  
 First of all, you do not use the parameter Can you name the name of a table or column so your field parameter is not valid in this context.  
 Secondly, you can not use a parameter to express the full values ​​of these segments. Your example will translate the parameter @ field ID  
  WHERE ..... IN ('1,2,3,4')   
 Will be treated as a string, as different values ​​are not included in your reference -  
 For the field part,  If you are absolutely sure that the  string field  The parameter passed to your method is not directly typed by your user, so you have a string containment expression You can use the person (well you're already doing this for table so that the warning is also good for that value)  
  String.Format ("SELECT COUNT (*) FROM {0} WHERE {1} IN (....) ", table, area);   
 For IN part, I suggest, in the calling function, instead of passing the string to create a list of parameters to be added to the query.  
  Public Zero removal (string table, string field, list & lt; SqlParameter & gt; inParameters) {StringBuilder sb New StringBuilder (); Where {1} IN (", table, field) from Sb.AppendFormat (" SELECT COUNT (*)); (Using SQL Commands CMD = New SQL Commands ()) (CLD Connection = connection; // Loop on the list of parameters, add the parameter name to these sections and parameter for SqlCommand archive foreach (SqlParameter p in inParameters } {sb.Append (p.Name + ","); cmd.Parameters.Add (P);} // Final Comma SB Length ---- Trim Out;; // Close this section; snApp.Append (")"; Cmd.CommandText = sb.ToString (); FieldCount = (int) command.Excllicate Ascendant ();}}

Comments

Post a Comment

Popular posts from this blog

Verilog Error: output or inout port "Q" must be connected to a structural net expression -

I get the error every time, I try to compile. I'm not sure why anyone can help is? I'm new to verilog. Module D_FF (clerk, d, reset_n, q); Input D, Clack, reset_en; Output Q; reg Q; lab4_gdl f1 (.lk (~ clk), d (d), .q.m (qm)); lab4_GDL f2 (.Clk (Clk), D (QM), .Q (Q)); Always start at @ (posedge clk, neggeous reset_n) (Reset_n == 0) Q & lt; = 0; Other questions & lt; = D; Edit End: The problem is what we are asking to do: In this section, you apply the memory / registration circuit on the AlterEdie 2 board. will do. The circuit has the following specifications: The present value of swift SW15-0 on the D2 board should be shown in four hexadecimal four sections of HEX3-0. This part of the circuit will be combination logic. To use an active-less asynchronous reset and KEY1 to use KEY0 as the clock input, you must store SW15-0in in a 16-bit register in the value The register should be enabled to have a 16-bit positive edge, which uses the embedded D flip-flo
Read more

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon
Read more