Acess SQL查询缺少更多必需参数
在Web项目中，我正在尝试执行以下查询：
SELECT ItemName as Name, ItemPicture as Picture, ItemHeroModif as Assistance, ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM Item WHERE ItemId = @value0 有了断点，我可以看到我附加了@value0的值， 2 。
尽管如此，我收到以下错误：
没有给出一个或多个必需参数的值。
我知道这个错误通常是由于错误的SQL语法而产生的。 我做了什么有什么不对吗？
编辑 ：
附件代码：
var madeForCommand = "SELECT ItemName as Name,ItemPicture as [Picture],ItemHeroModif as Assistance,ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM Item WHERE "; OleDbCommand command = new OleDbCommand(); for (int ii = 0; ii < items.Count; ii++)// items is a list of items with IDs I want to get from the query. { madeForCommand += "ItemId =@value"+ii+" OR "; } madeForCommand = madeForCommand.Substring(0, madeForCommand.Length - 4); // making sure I trim the final or; In the case I shown, it's just one item, so there are none at all.
后来：
OleDbCommand forOperations = new OleDbCommand(madeForCommand, _dbConnection); //_dbConnection is the connection to the database, it seems to work pretty well. for (int ii = 0; ii < items.Count; ii++) { string attach = "@value" + ii; command.Parameters.AddWithValue(attach, items[ii].ID); }
我很确定items[ii].ID很好，断点显示它等于2并且附件顺利。
编辑2 ：我编写了代码为Krish和Hans建议我，我得到以下查询，没有任何附件： SELECT ItemName as [Name],ItemPicture as Picture,ItemHeroModif as Assistance,ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM [Item] WHERE (ItemID in (2)); 。 如果它改变了什么，我仍然会得到同样的错误。
编辑3 ：在Access中执行查询要求我给参数“ItemPicture”赋值…奇数; ItemPicture是一个专栏，不是吗？
Name ， Item和Picture是Access查询中的问题单词 。 将它们括在方括号中：
SELECT ItemName as [Name], ItemPicture as [Picture], ItemHeroModif as Assistance, ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM [Item] WHERE ItemID in (2);
由于包围这些名称仍然给您一个缺少的参数投诉，我要求您在Access的查询设计器中测试该查询。 在该上下文中，Access提供了一个参数输入框，其中还包括Access将其解释为参数的单词。
您报告Access认为ItemPicture是一个参数。 因此，通过在Access Design View中检查该表，您发现实际的字段名称是ItemImageURL 。
SELECT ItemName as [Name], ItemImageURL as [Picture], ItemHeroModif as Assistance, ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM [Item] WHERE ItemID in (2);
您没有从应用程序外部获取Where条件，因此字符串连接是安全的。 （至少我是这么认为的）
只需添加如下参数：
var madeForCommand = "SELECT ItemName as Name,ItemPicture as Picture,ItemHeroModif as Assistance,ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems " + "FROM Item WHERE (ItemID in ("; OleDbCommand command = new OleDbCommand(); for (int ii = 0; ii < items.Count; ii++)// items is a list of items with IDs I want to get from the query. { if (i<=1) { madeForCommand += items[ii].ID }else { madeForCommand += "," + items[ii].ID; } } madeForCommand += "))"
最后你会有一个SQL查询，如：
"SELECT ItemName as Name,ItemPicture as Picture,ItemHeroModif as Assistance,ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems " + "FROM Item WHERE (ItemID in (1,2,3))";
MS Access不知道这样的参数： @value0 ！
用? 相反或命名参数如下：
PARAMETERS [value0] INT; SELECT ItemName as Name, ItemPicture as Picture, ItemHeroModif as Assistance, ItemTroopModif as Charisma, HerbCost as Herbs, GemCost as Gems FROM Item WHERE ItemId = [value0];
如何调用此查询？ 请阅读： 从.NET应用程序访问Microsoft Office数据
有关详细信息，请参阅： OleDbCommand.Parameters属性
[编辑]
根据我的理解，您希望将多个ItemId传递给查询。 所以，你必须使用IN子句：
SELECT ... FROM ... WHERE ItemID IN (1, 2, 5, 8)