SQL Server :: Checking Whether Or Not Column Available In Database
Aug 20, 2010
I am building next version of our Asp.net web application. for this new build one column is added in database. Now I have to make this new build backward compatible. Means build should be good for old database design (without that added column) and new design. Just wondering if there is an efficient way to know whether or not particular column exists in table you are working with?
at this time, I am getting all the columns in datatable and loop through it to make sure that new column is available in it? if yes the modified query with this column and if not then old query. Just cuious, what is the best industry practise to make any build backward compatible with old database design?
i have designed a database into the vs 2008 mobile database. my batabase has three column column1(int),column2(int),column3(int) and i want to set the value of val(column3)=val(column1)+val(column2); how and where to set the computed column value.
In the tutorial I am doing I have been requested to change a field in the colums properties of a table. The ID column is currentl displaying NO and NO again for "is aIdentity. I can Highlight the values but cannot change to yes. either in the properties talbe or in the properties window on the right hand side of IDE interface. How do I change that value?
actually recently we just shifted our website. & now when i try to transfer database from my previous server to new remote server database.all the tables auto increment field is set to 'NO' and there is no primary key anymore.
I am using c# with asp.net and SQL Server 2005 as backend. I want to use dropdown list control in a form to populate a textbox. The dropdown control is linked to a column in the database. How can I code this in c#?
I have an ASP.NET page which contains a large number of gridviews, which contain masses amount of data which take a fair while to rebind. I currently have it set so the gridviews are only bound when the account number is changed (on the page, the user searches for an account which then displays their information). I'd like it to be able to monitor a database table (hashing it maybe?) every few minutes, then if there are changes spawn a popup box informing them, and an option to have the gridviews refreshed. Firstly, is this possible in ASP.NET/C#? Secondly, what would the performance impact be on the page checking the hash/checking for changes in a large DB table?
I have got a page in which there is a file upload option where I have to upload/import the csv file. What I want to do is to check if the correct format of file is uploaded for instance if any other than csv file is uploaded, the system should give an error message. Also what I need to do is to check certain fields of the csv file for instance there are some mandatory fields in the csv file which should be there like name , postcode, How can I check that these fields are not empty . After performing these task, the system should automatically upload the csv file onto the sql sever 2008.
I would like to know if someone can please help me with the followingI would like to create a bulk entering textbox...every sentence seperated by a line break should go in to the Database as a new column.....Im gonna use SqlDatasource for the inserting..How can I get all the sentences to break up at the linebreak and then get inserted in a separate database column?
how to check if a particular data in the database already, for example, i want to check if a username already exist in database, then the user cant choose that username.
I have a page that inserts a record to an sql database and I would like to do the following:
(i) Check if a record already exist before trying do an insert
(ii) If a record exist, the page should be able to inform/display a message in a textbox informing the user that the record already exist.
I have seen a number of post on the internet that suggest that one possible solution is to write a sproc and use the T-sql IF EXIST function. However, I have NOT seen a complete code showing (a) how this can be done (b) how to call the sproc from an asp page (c) and MORE IMPORTANTLY how to display a message informing a user that a record already exist i.e. when the record already exist in the database.
I need to check for duplicate records before inserting them into the SQL database.Thus I have the following codes:
For count = 0 To GridView1.Rows.Count If (GridView1.Rows(count).DataItem("Student Name").Equals(dtDataTable.Rows(count).Item("Student ID"))) Then lblMsg.Text = "Records Existed" End If
but there are error message. "Object variable or With block variable not set."
i have code to update multiple rows in a gridview. What I want is that if the row value is = 1 in the database then the row is checked otherwise it's not. I've put some pseudo code in below to illustrate what I want to achieve.
I am using a form to add and edit record of database.
In Add case my email box has no value. I have used customservervalidation to check the given email address with previous database records.
In Edit case my email box is populated with data from database.
When i click save button in both cases my customservervalidation method invokes and checks the given value. it works fine for new/add case but in edit case it checks with itself also and says duplicate email... pointing own record...
I'm currently working on a small project and therefore created a gridview, including one bit column which has been linked with a checkbox in both the itemtemplate as the edititemtemplate (autopostback = true).Databinding for these two checkboxes has been linked (two-way) to the bit column.Now I want to display the gridview to end-users. They should be able to just click on the checkbox so they value in the database column gets changed as well (as I want to run update queries behind it), but not passing via the command column 'EDIT'.=> problem I'm having now is that the bit column in the database doesn't get updated.
I'm currectly tryin to access a specific value in my database in a specific column. I'm tryin to use the primary key of the table to access the actual value in the row of that ID.
The current code:
[Code]....
Just iterates through the table and looking for any row with the boolean 'checkin' value is True, then it takes the 'id' value of that row and stores it into an array. Is there a way that I can access a another entry, and only that entry, in the table with the 'id' stored in the array?
Like if my data base contained and int, primarykey, `id` value, a boolean, `checkedin` value, and a `time` value, is there a way to access, lets say, the row with `id` equalling 3 and and the checkIn value from that row?
is a way of proofing a stored procedure in terms of the datetime localisation. For example, in the C# we may use the web.config or machine.config to set the application's localised date settings:
This helps when we do a date comparison in a static class of ours to return a certain rating factor. Is there an equivalent way of us checking whether or not the date we pass into the stored procedure is in e.g. UK format and will be compared against our dates in the UK format too? We have 2 datetime columns, DateEffectiveFrom and DateEffectiveTo in our table and we use those dates to compare with the date passed in to return the relevant data.
I'm having trouble with an SQL statement. I want to have one statement that checks to see if it a record exists. If it does, then update it and if it doesnt then insert a new one in the server. Here is what I have so far:
I have Create user form through which i am creating thousands of users and generating unique user id's. If there are lot of concurrent users using the form then how should I display the new generated user id to user through stored procedure I have tried returning the value by comparing row count and checking with user name but its not working in fast way.I am displaying the user id on form itself.Any alternate solution for this?
I have a .net 3.5 application in c# with sql server 2008 at back end. The application is about assigning jobs to supervisors and then these supervisors have to write remarks about the job progress from time to time. There are two tables ; a JobAssign table with JobOrderNo and Supervisor columns, and a JobUpdate table with jobOrderNo,Date And Remarks(nvarchar) column.
When a supervisor is assinged a job he is sent an email but sometimes the supervisors do not write remarks about a job for some time. i want a stored procedure through which if the remarks of a job are not written for say 5 days an email is sent to the supervisor to do so? in my job update table there are multiple entries for a job so the stored procedure will have to check the Top Remarks Date for each jobOrderNo. then compare it to today date if the difference is difference is 5 days then send email. i have read posts on sending email through job scheduler but i'm new to stored procedure so have no idea how to write such.
I want to copy data from a table[tblExcel][No.of columns:2] to another table[ev_event] which has 5 columns, 2 columns from the another table, 3 columns from user defined value
