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Posted By

mn232nm on 11/02/08

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Last Edited at 11/02/08 02:08am

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AccessHelperParameterCache

/ Published in: C#
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AccessHelperParameterCache

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  1. using System;
  2. using System.Collections;
  3. using System.Collections.Generic;
  4. using System.Data;
  5. using System.Data.OleDb;
  6. using System.Text;
  7.  
  8. namespace Web.DataAccess
  9. {
  10.     public sealed class AccessHelperParameterCache
  11.     {
  12.         private AccessHelperParameterCache() { }
  13.  
  14.         private static OleDbParameter[] CloneParameters(OleDbParameter[] originalParameters)
  15.         {
  16.             OleDbParameter[] cloneParameters = new OleDbParameter[originalParameters.Length];
  17.             for (int i = 0; i < cloneParameters.Length; i++)
  18.             {
  19.                 cloneParameters[i] = (OleDbParameter)(((ICloneable)originalParameters[i]).Clone());
  20.             }
  21.  
  22.             return cloneParameters;
  23.         }
  24.  
  25.         private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());
  26.  
  27.         public static void CacheParameterSet(string connectionString, string commandText, params OleDbParameter[] commandParameters)
  28.         {
  29.             if (null == connectionString || string.Empty == connectionString) throw new ArgumentNullException("connectionString");
  30.             if (null == commandText || string.Empty == commandText) throw new ArgumentNullException("commandText");
  31.             if (null == commandParameters || 0 == commandParameters.Length) throw new ArgumentNullException("commandParameters");
  32.  
  33.             paramCache[connectionString + ":" + commandText] = CloneParameters(commandParameters);
  34.         }
  35.  
  36.         public static OleDbParameter[] GetCacheParameterSet(string connectionString, string commandText)
  37.         {
  38.             if (null == connectionString || string.Empty == connectionString) throw new ArgumentNullException("connectionString");
  39.             if (null == commandText || string.Empty == commandText) throw new ArgumentNullException("commandText");
  40.  
  41.             OleDbParameter[] cachedParameters = paramCache[connectionString + commandText] as OleDbParameter[];
  42.             if (null != cachedParameters)
  43.             {
  44.                 CloneParameters(cachedParameters);
  45.             }
  46.             return null;
  47.         }
  48.     }
  49. }

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