使用OleDbParameter来写Access的更新没反应的解决办法

　　动软代码生成器生成的DAL，一开始生成的是MsSQL的。后来有需求，要转换成了Access。动软对Access生成支持不好，我手动替换了一次。然后把数据库从SQL导进Access。咋一看都没问题。
　　结果到了产品更新的部分，提示我Product_ID不能更新：

---

  public void Update(WoooXVi.EPCHR.Model.Product model)
  {
   StringBuilder strSql=new StringBuilder();
   strSql.Append("update Product set ");
   strSql.Append("Product_ID=@Product_ID,");
   strSql.Append("Product_Title=@Product_Title,");
   strSql.Append("Product_Class=@Product_Class,");
   strSql.Append("Product_CreateDate=@Product_CreateDate,");
   strSql.Append("Product_CreateAdmin=@Product_CreateAdmin,");
   strSql.Append("Product_Hit=@Product_Hit,");
   strSql.Append("Product_Content=@Product_Content,");
   strSql.Append("Product_Top=@Product_Top,");
   strSql.Append("Product_SImg=@Product_SImg,");
   strSql.Append("Product_BImg=@Product_BImg,");
   strSql.Append("Product_UpdateDate=@Product_UpdateDate,");
   strSql.Append("Product_UpdateAdmin=@Product_UpdateAdmin,");
   strSql.Append("Product_PVContent=@Product_PVContent");
   strSql.Append(" where Product_ID=@Product_ID ");
   OleDbParameter[] parameters = {
     new OleDbParameter("@Product_ID", OleDbType.Integer,4),
     new OleDbParameter("@Product_Title", OleDbType.VarChar,50),
     new OleDbParameter("@Product_Class", OleDbType.Integer,4),
     new OleDbParameter("@Product_CreateDate", OleDbType.Date),
     new OleDbParameter("@Product_CreateAdmin", OleDbType.VarChar,50),
     new OleDbParameter("@Product_Hit", OleDbType.Integer,4),
     new OleDbParameter("@Product_Content", OleDbType.VarChar,0),
     new OleDbParameter("@Product_Top", OleDbType.Integer,4),
     new OleDbParameter("@Product_SImg", OleDbType.VarChar,200),
     new OleDbParameter("@Product_BImg", OleDbType.VarChar,200),
     new OleDbParameter("@Product_UpdateDate", OleDbType.Date),
     new OleDbParameter("@Product_UpdateAdmin", OleDbType.VarChar,50),
     new OleDbParameter("@Product_PVContent", OleDbType.VarChar,50)};
   parameters[0].Value = model.Product_ID;
   parameters[1].Value = model.Product_Title;
   parameters[2].Value = model.Product_Class;
   parameters[3].Value = model.Product_CreateDate;
   parameters[4].Value = model.Product_CreateAdmin;
   parameters[5].Value = model.Product_Hit;
   parameters[6].Value = model.Product_Content;
   parameters[7].Value = model.Product_Top;
   parameters[8].Value = model.Product_SImg;
   parameters[9].Value = model.Product_BImg;
   parameters[10].Value = model.Product_UpdateDate;
   parameters[11].Value = model.Product_UpdateAdmin;
   parameters[12].Value = model.Product_PVContent;

   DbHelperSQL.ExecuteSql(strSql.ToString(),parameters);
  } 

——原来是SQL里面我Product_ID没设置自增长，Access设置了自增长。把更新Product_ID的语句去掉。（红色加粗字体部分）

运行……结果错误是没提示了，但是却没有效果——更新之后一刷新，又还原了！数据库里面根本没改动。

后来查资料才知道。是微软的一个BUG。在更新Access数据库时，如果使用OleDbParameter。那么OleDbParameter参数的的定义顺序必须和查询语句中参数出现的顺序一致！
就是说我删掉了本来更新Product_ID的语句，那么Product_ID在查询语句中出现的位置从一开始的第一个出现(Update Product_ID = @Product_ID)变成了最后一个出现(Where Product_ID = @Product_ID)。
所以，只要把参数定义的顺序换过来就行了。以下代码执行成功：

---

        public void Update(WoooXVi.YKYSRH.Model.Product model)
        {
            StringBuilder strSql = new StringBuilder();
            strSql.Append("update Product set ");
            strSql.Append("Product_Title=@Product_Title,");
            strSql.Append("Product_Class=@Product_Class,");
            strSql.Append("Product_CreateDate=@Product_CreateDate,");
            strSql.Append("Product_CreateAdmin=@Product_CreateAdmin,");
            strSql.Append("Product_Hit=@Product_Hit,");
            strSql.Append("Product_Content=@Product_Content,");
            strSql.Append("Product_Top=@Product_Top,");
            strSql.Append("Product_SImg=@Product_SImg,");
            strSql.Append("Product_BImg=@Product_BImg,");
            strSql.Append("Product_UpdateDate=@Product_UpdateDate,");
            strSql.Append("Product_UpdateAdmin=@Product_UpdateAdmin,");
            strSql.Append("Product_PVContent=@Product_PVContent");
            strSql.Append(" where Product_ID=@Product_ID ");
            OleDbParameter[] parameters = {
     new OleDbParameter("@Product_Title", OleDbType.VarChar,50),
     new OleDbParameter("@Product_Class", OleDbType.Integer,4),
     new OleDbParameter("@Product_CreateDate", OleDbType.Date),
     new OleDbParameter("@Product_CreateAdmin", OleDbType.VarChar,50),
     new OleDbParameter("@Product_Hit", OleDbType.Integer,4),
     new OleDbParameter("@Product_Content", OleDbType.VarChar,0),
     new OleDbParameter("@Product_Top", OleDbType.Integer,4),
     new OleDbParameter("@Product_SImg", OleDbType.VarChar,200),
     new OleDbParameter("@Product_BImg", OleDbType.VarChar,200),
     new OleDbParameter("@Product_UpdateDate", OleDbType.Date),
     new OleDbParameter("@Product_UpdateAdmin", OleDbType.VarChar,50),
     new OleDbParameter("@Product_PVContent", OleDbType.VarChar,50),
     new OleDbParameter("@Product_ID", OleDbType.Integer,4)};
            parameters[0].Value = model.Product_Title;
            parameters[1].Value = model.Product_Class;
            parameters[2].Value = model.Product_CreateDate;
            parameters[3].Value = model.Product_CreateAdmin;
            parameters[4].Value = model.Product_Hit;
            parameters[5].Value = model.Product_Content;
            parameters[6].Value = model.Product_Top;
            parameters[7].Value = model.Product_SImg;
            parameters[8].Value = model.Product_BImg;
            parameters[9].Value = model.Product_UpdateDate;
            parameters[10].Value = model.Product_UpdateAdmin;
            parameters[11].Value = model.Product_PVContent;
            parameters[12].Value = model.Product_ID;

            DbHelperOleDb.ExecuteSql(strSql.ToString(), parameters);
        }