Searching A Database Field For Null Value

Feb 27, 2008


I am building a website in C# for a university project, and would like to search a table (Member) for a field (UserName) using a session variable Session["sUserName"]. If that field is null, then I would like to insert that session variable into the field to start to create a new user. However, I am getting errors saying that I am using invalid expression terms. My code is;

//Create the Command, passing in the SQL statement and the ConnectionString queryString = "SELECT UserName FROM Member WHERE (UserName = @myUsername); ";

SqlCommand cmd = new SqlCommand(queryString, sqlConn);cmd.Parameters.Add(new SqlParameter("@myUsername", Convert.ToString(Session["sUserName"])));

//If UserName is null, display confirmation, else display errorif (UserName == null) ;

{UserNameCheckLabel.Text = "Username okay";

String queryString = "INSERT INTO Member (UserName) VALUES(@myUsername); ";SqlCommand cmd = new SqlCommand(queryString, sqlConn); cmd.Parameters.Add(new SqlParameter("@myUsername", Convert.ToString(Session["sUserName"])));


{UserNameCheckLabel.Text = "That username is in use";


I have a feeling I should be checking the database for the UserName, but I'm not sure whether to put this in the SELECT statement part or as a method... I would be most grateful for any advice!

Many thanks,


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How To Insert Null Values Into A DataBase Field

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I have a function that updates a table in sql server
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I have a column called person.last_name, and I want to set this field to NULL if person.last_name ='test'///

I have tried this but don't work: ISNULL ({person. last_name},'<>"test'))

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Set Field Value To Null

Apr 22, 2007

May i know how to generate a SQL query to set a field of row to Null? Thank you.

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Searching In Sql Server Database

Mar 31, 2008

hi there,i have a textbox in my page and a button,when the button is clicked the application will search for the text written in the textbox in my database which is sql server, it works fine in my system but when i upload my website in the web it doesn't work correctly i mean that it dosent find all the matches, why this happens? is it possible that this problem occur because of the different fonts which is used in sql server and the font is used in my application?
thanks for help

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Searching In All Tables In A Database

Apr 7, 2005

Whats the easiest way to search for a keyword in all the tables present in the database.
Or searching in 5-6 tables.

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Searching For Values Within A Database?

Oct 2, 2014

I've been given read access to a database and I also am looking at a GUI which draws data from the database. I am trying to map the results I see from the GUI to find the columns that the data is in... So.. big database, takes a long time to search the entire thing so I try to narrow it down by the following:

select * from information_schema.columns where table_schema = 'db19' and table_catalog = 'masterdb' and
table_name in(select table_name from information_schema.tables where table_type = 'base table' and table_catalog = 'masterdb' and table_schema = 'db19' and data_type in ('text' and 'varchar'))

This essentially gives me a list of tables and columns whos data type is either text or varchar. Once I have this list... I then run the following on each:

select top 1 [col_name] from [table_name] where [col_name] like ' (here is the value I want to search) '

So this runs through each table, looking to see if a value exists and if so, prints the result.

I am then left with a much much smaller list that I can manually look through and find the one I am looking to specifically find.

Is it possible to do this running only one query... where the output gives me all the columns in with a specific data type that contain a value I enter Anything else to make this more efficient

I am aware that there are data mining programs that could probably do this however I only have read access on the database which often causes a problem. The application I am using is "Aqua Data Studio" ....

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Searching Entire Database

Mar 11, 2004

Is there any way to do a complete database search in SQL server? For instance, if I have a criteria "DBFORUMS", I would like to scan through all user tables in my database to get all records with the word "DBFORUMS" stored, just like want we are doing in "Quick Search" in dbforums site.

Any ideas?

Thanks in advance.

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Searching The Entire Database

Aug 28, 2005

Hi friends

Suppose i have a table of 100 cols and 10000 rows i want to search a particular field called 'Newyork' . I dont no what the col is ?

Can anyone tell me how can i search that


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Searching An Entire Database

Dec 28, 2005

Hi, this is my first post on these forums, so please excuse me if this topic has already been covered.

I'm currently working in a power station for student vacation work placement. I need to export data from a database that gets it's data from machinery and inputs out in the plant. The machines that provide this input put it into a database, and I need to find the relevant data to export.

My problem is that, in some cases, the sample data that i'm given may be under different field names, in a completely unrelated table. I was looking for a way to search the entire database (250+ tables) for a certain string, so I can find where it is in the database, and run queries on the table it originates from. For example:

My sample data shows me that I have an object with the ID Y03A3DEA_TH1. I know this ID will occur somewhere else in the database, but i'm just not sure where.

If anyone knows of any way that I can search the entire database for specific data, either using tools in MS SQL 2000, or 3rd party apps, i would greatly appreciate their help.

Thanks a lot,
Jack Smith

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