How to Efficiently Execute Stored Procedures and Retrieve Results in Classical ASP?

Classic ASP Stored Procedure Execution and Result Retrieval: Best Practices

Classic ASP developers often encounter challenges when working with SQL Server stored procedures, particularly regarding result retrieval. Empty responses or closed recordsets are common problems, even when the procedure should return data. This often stems from overlooking crucial SQL Server settings and inefficient data handling within the ASP code.

One frequent cause of empty results is neglecting to use SET NOCOUNT ON in the stored procedure. By default, SQL Server returns the number of rows affected, which can interfere with the actual result set. SET NOCOUNT ON ensures only the data is returned.

Another performance bottleneck is iterating through data using ADODB.Recordset. This approach can be slow. A more efficient method is to retrieve the entire result set into an array for subsequent processing.

Optimized Approach for Classic ASP Stored Procedure Handling:

The following steps detail an optimized method for executing stored procedures and retrieving data in Classic ASP:

1. Instantiate ADODB.Command: Create an ADODB.Command object and establish a connection using a valid connection string or an ADODB.Connection object.

2. Configure Command Properties: Set the CommandText property to the stored procedure name and the CommandType property to adCmdStoredProc.

3. Manage Parameters: If the stored procedure accepts parameters, use the Parameters collection to add them, specifying data type and direction (e.g., adParamInput).

4. Execute and Retrieve Data: Execute the command using the Execute method. Instead of directly processing the recordset, use the GetRows method to efficiently load the entire result set into a two-dimensional array.

Revised Code Example:

Here's a refined code example demonstrating these improvements:

Const adParamInput = 1, adVarChar = 200
Dim conn_string, row, rows, ary_data

conn_string = "PROVIDER=SQLOLEDB;DATA SOURCE=X;DATABASE=Y;UID=Z;PWD=W;"

Set objCommandSec = CreateObject("ADODB.Command")
With objCommandSec
  .ActiveConnection = conn_string
  .CommandType = adCmdStoredProc
  .CommandText = "usp_Targets_DataEntry_Display"
  .Parameters.Append .CreateParameter("@userinumber", adVarChar, adParamInput, 10, inumber)
  .Parameters.Append .CreateParameter("@group", adVarChar, adParamInput, 50, "ISM")
  .Parameters.Append .CreateParameter("@groupvalue", adVarChar, adParamInput, 50, ismID)
  .Parameters.Append .CreateParameter("@targettypeparam", adVarChar, adParamInput, 50, targetType)

  Set rs = .Execute()
  If Not rs.EOF Then
    ary_data = rs.GetRows()
    rs.Close()
    Set rs = Nothing
  End If
End With
Set objCommandSec = Nothing

' Process data from the array
If IsArray(ary_data) Then
  rows = UBound(ary_data, 2)
  For row = 0 To rows
    Response.Write(ary_data(1, row) & "<br>") ' Example: Accessing the second column (index 1)
  Next
Else
  Response.Write("No data returned")
End If

This revised code efficiently retrieves data into an array, avoiding the performance overhead of recordset iteration, leading to faster and more reliable stored procedure execution in Classic ASP. Remember to handle potential errors appropriately in a production environment.

The above is the detailed content of How to Efficiently Execute Stored Procedures and Retrieve Results in Classical ASP?. For more information, please follow other related articles on the PHP Chinese website!