C＃OleDb select查询抛出缺少的运算符异常

Question

I'm currently connecting to and working with a MS Access database. I can do a generic select * query fine, so I am connected to the db, but when I try to select using parameters it throws a missing operator exception.

string selectStatement = "Select ID from pages where page_title = ? limit 1";
string title = Request.QueryString["pagetitle"];

OleDbCommand selectCommand = new OleDbCommand(selectStatement, conn);
selectCommand.Parameters.Add("@p1",OleDbType.VarChar);
selectCommand.Parameters["@p1"].Value = System.Web.HttpUtility.UrlDecode(title);
OleDbDataReader selectResult = selectCommand.ExecuteReader();

The error I get is on the ExecuteReader line:

Exception Details: System.Data.OleDb.OleDbException: Syntax error (missing operator) in query expression 'page_title = ? limit 1'.

I've tried using @p1 inside the query, as well as the current ?. I've tried adding the parameters different ways, including removing the @ in the parameter name. Nothing seems to work. Can someone point me in the right direction?

Answer 1

AFAIK, there is no LIMIT clause in MS Access.

And, parameters should be named, @p1 in your case, instead of ?

I haven't worked with Access for years, so I might be wrong, but instead of LIMIT , try this:

Select TOP 1 ID from pages where page_title = @p1

Also, if appropriate, consider this advice:

MS Access isn't quite the right DBMS to handle websites (I suspect in your case it's a website). For an alternative file-based database management systems, check SQLite and FirebirdSQL . Both have a lot of tools you can use for GUI, like SQLite Maestro, and respectively IBExpert.
Queries are more flexible in those DBMS.