绑定参数给OLEDB命令抛出错误 [英] Binding parameters to OLEDB command throws error

问题描述

我使用AS 400 OLEDB与.NET。它使用'？'而不是'@param用命令绑定参数
现在有一种情况，命令是像

I am using AS 400 OLEDB with .NET. It uses '?' instead of '@param to bind parameters with a command Now there is a situation where the command is like

SELECT ...
FROM
   (SELECT ... 
         ROW_NUMBER() OVER(ORDER BY ColumnName) as RowNum
    FROM Employees e
   ) as DerivedTableName
WHERE RowNum BETWEEN @startRowIndex AND (@startRowIndex + @maximumRows) - 1

我的命令变成

Now my command becomes

    SELECT ...
FROM
   (SELECT ... 
         ROW_NUMBER() OVER(ORDER BY ColumnName) as RowNum
    FROM Employees e
   ) as DerivedTableName
WHERE RowNum BETWEEN ? AND (? + ?) - 1

现在当我绑定参数

myCommand.Parameters.Add(new OleDbParameter("?",startRowIndex));
myCommand.Parameters.Add(new OleDbParameter("?", startRowIndex));
myCommand.Parameters.Add(new OleDbParameter("?", MaximumRows));

它会引发错误

SQL0417: Combination of parameter markers not valid.
Cause . . . . . :   The statement string specified as the object of a PREPARE statement contains a predicate or expression where parameter markers have been used as operands of the same operator.  The following restrictions apply to the use of parameter markers: -- Both the operands in a predicate cannot be parameter markers. For example, specifying predicates of the form:    ? = ?      or    ? = ( SELECT ? FROM x ) are not valid. 

如何在这种情况下绑定参数？我想避免sql注入：）

How do I bind parameters in this situation ? I want to avoid sql injection :)

推荐答案

尝试更改参数的名称

myCommand.Parameters.Add(new OleDbParameter("@startRowIndex",startRowIndex));
myCommand.Parameters.Add(new OleDbParameter("@startRowIndex2", startRowIndex));
myCommand.Parameters.Add(new OleDbParameter("@MaximumRows", MaximumRows));

但保留SQL。

这篇关于绑定参数给OLEDB命令抛出错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！