Develop Reference

SQL Server pre-deploy script to recreate table new columns and preserve data

I created a project in ASP.NET MVC with a separate database project which I run every time there is a table change. My only problem is that if I add one column for example, it will drop the entire database and recreate it and delete all data in the table.
Does anyone know of a pre-deployment script or a method I can use to add / remove / rename tables or column and at the same time preserve the integrity of my data? i.e keep my data while modifying my database

You can rename columns using SQL Server functions, but doing this risks breaking scripts used by other functions or stored procedures in your database. I don't endorse this practice, so I'm not posting about it below. Adding or removing columns is fair game.
You can add columns to a table by using the following query:
ALTER TABLE [YourTable]
ADD [ColumnName] [Datatype];
And you can drop columns using this query:
ALTER TABLE [YourTable]
DROP COLUMN [ColumnName];
These SQL commands will preserve the other columns in your table. If you want to change a column name I encourage you to set up a View in your SQL Server client and give the column an alias.
This can be accomplished using:
CREATE VIEW [ViewName]
AS
SELECT [ColumnName] AS [ColumnAlias]
FROM [TableName]
GO
You'd be able to perform SELECTS on the view in just the same way you can query SELECT on a normal table, except you can query the [ColumnAlias] instead of the [ColumnName]. You cannot perform INSERT or DELETE queries on a view, however

Save XML data into database as columns in C#

I'm writing an C# application that watch for newly created xml files, and I want to insert some of the data in these XML files to a SQL database. One file is one row in the database.
What is the best and easiest way to do this?
What I have done so far is to defined a DataTable with the columns I want from the XML. After that I use ReadXML on the DataSet. This give me a DataSet with one table and one row, and the columns I want. So far it's perfect. But I can't find a good way to ONLY insert this new DataRow into my MSSQL database. I don't have any unique ID for that row yet. Would this make it easier? I don't want to map my dataset with the database, I'm only doing an insert...

You can do something like this to get the ID:
string query = "INSERT INTO Employees (EmployeeID, Name, Phone) "+
"OUTPUT INSERTED.EmployeeID "+
"VALUES (NEWID(), 'John Kris', '99-99999')";
Guid lastId = (Guid)command.ExecuteScalar();
The rest of the things you do sound ok for me.

I used LINQ to SQL to solve this. I set it up somewhat like described here:
LINQ to SQL.
On the data context I used InsertOnSubmit.

How do I display XML data in SQL in HTML

I am working on redesigning an old application that stored content in sql as xml data. I know that if I have a file I can use this to display the data in HTML:
xmlhttp.open("GET","xmlfile.xml",false);
xmlhttp.send();
xmlDoc=xmlhttp.responseXML;
Now, lets say I have a table in SQL. In a column I have the contents of "xmlfile.xml". How can I go about displaying that data?

Are you looking for specific field in the xml, SQL Server can query fields of a xml tag inside a sql server column row.
http://msdn.microsoft.com/en-us/library/ms345122(v=sql.90).aspx

Copy C# datatable into mysql database table

I have created one DataTable in C# dynamically. I want to insert this whole DataTable in MySql database table.
I am using MySql hence SqlBulkCopy is not an option for me.
I have tried MySqlBulkLoader but it seems it only insert data from file.
I can do it via iterating through every datarow of datatable and insert it to database.
Is there any another way I can achieve multiple inserts into database?
Thanks for any help!

If the number of rows are not much you can simply create an insert statement
INSERT INTO table VALUES (1,2,3), (4,5,6), (7,8,9);
Another article at http://www.codeproject.com/Articles/19727/ADO-NET-Generic-Copy-Table-Data-Function may help.
Though, if the number of rows are high, you can probably create a temporary text file and then use BulkLoader !

Store DataTable to SQL Server column

I'm trying to store a DataTable into a single column in a SQL Server table. The idea behind this is a user runs a SQL command and the returned output is stored into a datatable, then I want that datatable to be stored into a SQL Server logging table. Later on I want to be able to retrieve that entire datatable back for displaying on a logging aspx page.
Currently I'm just storing it as a big string but that doesn't give me column headers and the formatting is kinda funky as well as being inefficient.
TIA

I would probably convert the datatable to XML and store it into an XML field type if I was going to do what you are trying to do.

Hello you can try with WriteXml
this link give you sample interessant : http://msdn.microsoft.com/fr-fr/library/system.data.datatable.writexml.aspx

Another Idea is to create two tables in your database. It is slightly complex.
One Table contains two columns, Let name the table PTable.
Columns:
ID and ColumnID
ID is the primary key and ColumnID contains the name of your column in datatable
After creating this table create another table. It will consists of three fields. Let name it STable. This table stores the columns of you datatable.
Columns:
stblID, PtblID and PtColumnID
StbID is the primary key in this table, PtblID is the Primary key of PTable and PtColumnID is the ColumnID of PTable. This table stores the rows of table. Now store the data in this table and receive the data when you need it.
and the simplest idea is to create a table in your datbabase having an xml column and store your datatable as an xml.