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Any characters or string not accepted in MS SQL?

Posted on 2011-03-09
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Last Modified: 2012-05-11
Hi,
I have a text (an article in fact) that i want to insert into a column (text). I noticed that with the HTML tag (even with HTMLencode), the text will not be inserted to MS SQL.

However, with just a normal text (with all the HTML tag removed), it's able to be inserted.

Thus my question is that any char, string, text format that is not accepted in MS SQL? So that i can filter out these unacceptable combination prior to inserting.

Thanks.
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Question by:tangteng78
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Expert Comment

by:wdosanjos
ID: 35091110
No, SQL Server accepts all characters.  

The issue should be on the code that is inserting the data.  Can you post the code in question?
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Author Comment

by:tangteng78
ID: 35091932
Same code is used.

I'd attached to you the 2 different input, one is the HTML text (which is not being inserted) vs the normal text (which work just fine).


HTMLtext.txt
NormalText.txt
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LVL 23

Expert Comment

by:OP_Zaharin
ID: 35092312
1-are you using any particular programming to insert the HTML? if you are using ASP, you  have to set ValidateRequest=false on the top of the page_Directive.

2-you can also create a procedure to handle the html codes as shown in another thread: http://www.experts-exchange.com/Programming/Languages/.NET/ASP.NET/Q_26506114.html
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Author Comment

by:tangteng78
ID: 35094307
Hi,
What's the difference then? Coz the same code is able to insert normal text. I'm using asp.net (vb). Still confuse if this is due to the coding.
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LVL 23

Expert Comment

by:wdosanjos
ID: 35094408
Please post the asp.net code that inserts the data.
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Author Comment

by:tangteng78
ID: 35103213
There you go.

function that takes in 2 parameters (the strBody variable is the one that takes in the HTML/normal text)
=================================================================================

objDb.insert(strSubject, HttpUtility.HtmlEncode(strBody))

And the class objDB class itself.
===========================
    'Insert new tweets
    Function insert(ByVal strTitle As String, ByVal strBody As String) As Integer

        '-----------------------------------------------------------------------------------------------
        'STORED PROCEDURE - INSERT (NON QUERY)
        '-----------------------------------------------------------------------------------------------
        'Setup and open connection string
        Dim con As New SqlConnection("Data Source=database/table,3181;DATABASE=;User ID=db;Password=db12;Trusted_Connection=False")

        con.Open()

        'Setup dataset and data adapter
        Dim dt As New DataTable
        Dim adp As New SqlDataAdapter

        'Setup stored procedure calls
        Dim cmd As New SqlCommand("isure", con)
        With cmd
            .CommandType = CommandType.StoredProcedure
            .Parameters.AddWithValue("@action", "insert")
            .Parameters("@action").Direction = ParameterDirection.Input
            .Parameters.AddWithValue("@id", String.Empty)
            .Parameters("@id").Direction = ParameterDirection.Input
            .Parameters.AddWithValue("@title", strTitle)
            .Parameters("@title").Direction = ParameterDirection.Input
            .Parameters.AddWithValue("@body", strBody)
            .Parameters("@body").Direction = ParameterDirection.Input
        End With

        'Run query
        adp.SelectCommand = cmd
        adp.Fill(dt)

        'Close connection
        con.Close()

        'Return the last inserted isure_info_id
        Return CInt(dt(0)(0))

    End Function

And the store procedure.
=====================
ALTER PROCEDURE [dbo].[isure]

      @action AS VARCHAR(50),
      @id AS INTEGER,
      @title AS VARCHAR(max),
      @body as nvarchar(max)
      
AS

DECLARE @NewId varchar(30)

IF @action = 'insert'
BEGIN
      
INSERT m_isure_info (title, body, created_date) VALUES (@title, @body, GETDATE())
SET @NewId=SCOPE_IDENTITY()            /*Get last inserted id*/

END
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LVL 23

Expert Comment

by:wdosanjos
ID: 35103514
Your stored proc and ASP.NET look good.  Can you verify that strBody contains a value just before calling objDb.insert?  Also, you said that the HTML value is not inserted. What happens exactly?  Does the code throws an exception, inserts nulls, or else?
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Author Comment

by:tangteng78
ID: 35103877
Yes, the strBody does contain the value prior to the store procedure.And it doesn't throw any error, it seems that it inserted a null.
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LVL 23

Expert Comment

by:wdosanjos
ID: 35104858
What tool do you use to query the database to verify that the data is not there?

Please run the following select.

     select title, len(body), created_date, body from m_isure_info

I'm suspecting that your db tool cannot display the html data due to its size.
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Accepted Solution

by:
OP_Zaharin earned 500 total points
ID: 35135340
have you try other datatype than nvarchar? try ntext maybe?
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