Unable to use parameter in SQL Statement
I'm trying to select a certain number of records from an Access table using VB.Net, however I'm having trouble setting the parameters. The code is listed below:
Dim sqlQry As String Dim iNumber As Integer = Convert.ToInt32(txtNoMemberships.Text) sqlQry = "SELECT TOP @MemberNo [ID] FROM tblMembership WHERE [Taken] IS NULL" Dim objConn As New OleDb.OleDbConnection Dim cmd As New OleDb.OleDbCommand Try objConn.ConnectionString = dbConnection objConn.Open() cmd.Connection = objConn cmd.CommandText = sqlQry cmd.Parameters.AddWithValue("@MemberNo", iNumber) cmd.ExecuteNonQuery() Catch ex As Exception MessageBox.Show(ex.Message) End Try
If I change
sqlQry to something like "SELECT 5 [ID] FROM tblMembership WHERE [Taken] IS NULL" then the command runs fine and I get no debug. But if I try to use parameters, I get the error:
The SELECT statement includes a reserved word or argument name that is misspelled or missing, or the punctuation is incorrect.
I know I could get away with it doing the following, but i thought it's best to err on the side of caution due to SQL injection:
sqlQry = "SELECT TOP " & iNumber & " [ID] FROM tblMembership WHERE [Taken] IS NULL"
As HardCode already said I think too it's not possible to use a parameter for the TOP N clause of the SELECT command. So, why not to concatenate the string to not use the parameter?
sqlQry = "SELECT TOP " & Convert.ToInt32(txtNoMemberships.Text).ToString() & " [ID] FROM tblMembership WHERE [Taken] IS NULL"
SQL Injection is not an issue as we're converting txtNoMembership to an Int32 then back to a String (remember to never concatenate strings without any cure on them first!)
Parameters, How do you pass a string parameter in SQL stored procedure? In general, when you create a SQL stored procedure or any query that accepts parameters, you might force the User to provide a value for that parameter. It is not the case in real-time, so you have to allow NULL values and empty strings. Let us see how to write SQL Query to Select All If Parameter is Empty or NULL with example.
You should use brackets:
sqlQry = "SELECT TOP (@MemberNo) [ID] FROM tblMembership WHERE [Taken] IS NULL"
How to pass parameters to a SQL Server stored procedure, Parameterizing a Query By Making It a Stored Procedure. If you want to find the sales data for Jack, you could start with a non-parameterized It is simple to exploit a procedure like this in a SQL Injection Attack. It also does not explicitly tell SQL Server where the parameters are. Parameterizing in T-SQL with sp_executesql. Another direct way to parameterize a query in T-SQL is to use sp_executesql and explicitly add your parameters. It looks like:
Try this instead
Dim sqlQry As String Dim iNumber As Integer = Convert.ToInt32(txtNoMemberships.Text) sqlQry = "SELECT TOP " & iNumber.ToString() & " [ID] FROM tblMembership WHERE [Taken] IS NULL" Dim objConn As New OleDb.OleDbConnection Dim cmd As New OleDb.OleDbCommand Try objConn.ConnectionString = dbConnection objConn.Open() cmd.Connection = objConn cmd.CommandText = sqlQry cmd.ExecuteNonQuery() Catch ex As Exception MessageBox.Show(ex.Message) End Try
Using Parameters for SQL Server Queries and Stored Procedures, Solved: How can I use parameters to create a dynamic SQL statement? My aim is to have the users be able to adjust the parameter dates at the opening of the How can I use parameters to create a dynamic SQL statement? I specified two parameters "DateStart" and "DateEnd" which I want to include in my Data source's SQL statement, but I don't know what the proper way to reference them is. My aim is to have the users be able to adjust the parameter dates at the opening of the report.
Solved: How do I pass parameters to my SQL statement?, Given this: SELECT a, bFROM p WHERE (:param IS NULL OR p.a like :param) Parameters don't seem to work at all. ERROR Column It is not straightforward to pass parameters to the SQL Queries statement in Power BI Desktop. Enable the parameters passing on the SQL Queries statement then the SQL Queries will be Dynamic instead of Static. The video is for any developers especially for Power BI developers or Excel Dashboard creators. This is level 300
unable to use parameters in POSTGRES sql statements – IDEs , By specifying procedure parameters, calling programs are able to pass values into the body of the procedure. Those values can be used for a For queries that you run regularly, you can use a PARAMETERS declaration to create a parameter query. A parameter query can help automate the process of changing query criteria. With a parameter query, your code will need to provide the parameters each time the query is run. The PARAMETERS declaration is optional but when included precedes any
Specify Parameters, I think I am losing it but I can't figure this out. request.input('param1', sql.VarChar, req.body.search); var query = "SELECT * FROM table Disable Parameter Sniffing for a Specific SQL Server Query This may be unknown to you, but a query can use a trace flag as a hint to change the behavior of the query optimizer. The way to do this is by adding the QUERYTRACEON hint to the OPTION clause. Here is the sample stored procedure followed by its execution.