Access里的变量使用与Sql语句里变量对应问题

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*Done By dayfrom klete ;
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　Sql语句　：
UPDATE tbl_Products SET pName = [@pName], pIntro = [@pIntro], pMarketPrice = [@pMarketPrice], pPreferentialPrice = [@pPreferentialPrice]
WHERE pId=[@pId];

　产品更新函数

 public bool ProductUpdate(dProduct one)
  {
   OleDbCommand sqlCmd = new OleDbCommand();

   AddParamToSQLCmd(sqlCmd, "@pName", OleDbType.VarChar, 50, ParameterDirection.Input, one.PName);
   AddParamToSQLCmd(sqlCmd, "@pIntro", OleDbType.LongVarWChar,one.PIntroduction.Length , ParameterDirection.Input, one.PIntroduction);
   AddParamToSQLCmd(sqlCmd, "@pMarketPrice", OleDbType.Single, 8, ParameterDirection.Input,one.PMarketPrice);
   AddParamToSQLCmd(sqlCmd, "@pPreferentialPrice", OleDbType.Single, 8, ParameterDirection.Input, one.PPreferentialPrice);
   AddParamToSQLCmd(sqlCmd, "@pId", OleDbType.Integer, 0, ParameterDirection.Input, one.PId);

   this.SetCommandType(sqlCmd,CommandType.StoredProcedure,SP_PRODUCTS_PRODUCTS_UPDATE);

　

/*
   AddParamToSQLCmd(sqlCmd, "@pId", OleDbType.Integer, 0, ParameterDirection.Input, one.PId);
   AddParamToSQLCmd(sqlCmd, "@pName", OleDbType.VarChar, 50, ParameterDirection.Input, one.PName);
   AddParamToSQLCmd(sqlCmd, "@pIntro", OleDbType.LongVarWChar,one.PIntroduction.Length , ParameterDirection.Input, one.PIntroduction);
   AddParamToSQLCmd(sqlCmd, "@pMarketPrice", OleDbType.Single, 8, ParameterDirection.Input,one.PMarketPrice);
   AddParamToSQLCmd(sqlCmd, "@pPreferentialPrice", OleDbType.Single, 8, ParameterDirection.Input, one.PPreferentialPrice);

   this.SetCommandType(sqlCmd,CommandType.StoredProcedure,SP_PRODUCTS_PRODUCTS_UPDATE);
*/

  
   return (this.ExecuteNonQuery(sqlCmd) == 1 );
  
  }

　测试结果
　如果更新函数是绿色部分，将无法对产品进行更新，主要原因是

  初步认为OleDbParameter[]的参数使用顺序与sql语句里的参数使用顺序必须是对应的，在access里面。。  

  但如果是sql2000里使用（SqlParameter[]），参数顺序则不会有影响。。 

 附上:AddParamToSQLCmd方法，不知是不是这个方法有问题

private void AddParamToSQLCmd(OleDbCommand sqlCmd, string paramId, OleDbType sqlType, int paramSize, ParameterDirection paramDirection, object paramvalue)
  {
   // Validate Parameter Properties
   if (sqlCmd == null)
    throw (new ArgumentNullException("sqlCmd"));
   if (paramId == string.Empty)
    throw (new ArgumentOutOfRangeException("paramId"));

   // Add Parameter
   OleDbParameter newSqlParam = new OleDbParameter();
   newSqlParam.ParameterName = paramId;
   newSqlParam.OleDbType = sqlType;
   newSqlParam.Direction = paramDirection;

   if (paramSize > 0)
    newSqlParam.Size = paramSize;

   if (paramvalue != null)
    newSqlParam.Value = paramvalue;

   sqlCmd.Parameters.Add(newSqlParam);
  }