CODEWITHSUNDEEP
c#entity-frameworkentity-framework-6.1
Christoph Fink
Christoph Fink

Reputation: 23113

Read data during migration

I have the following scenario:

Module A & B have their settings stored in an XML file. Module C has its settings stored in the DB (table with one row). Now I would like to move the settings from Module C to the XML file where A & B store their respective settings.

When I delete the SettingsC entity in the settings table will be deleted on the next migration.

Is there a way to read the tables content during that migration and write it to the XML file before the table is deleted?

EXAMPLE:

public partial class DropModuleCSettings : DbMigration
{
    public override void Up()
    {
        // here I would like to read the content of "dbo.SettingsC"
        DropTable("dbo.SettingsC");
    }

    public override void Down()
    {
        // ...
    }
}

Upvotes: 1

Views: 831

Answers (1)

aydjay
aydjay

Reputation: 868

I'm not sure about the timing of "When" to get the data out of the ModuleC Database table but you are probably going to be looking at:

http://blogs.msdn.com/b/saurabh_singh/archive/2010/05/11/export-sql-table-records-to-xml-form.aspx

Basically:

SELECT * FROM SettingsC FOR XML AUTO

This will give you the contents of your table in an XML file.

To retrieve this information do something along the lines of:

using (SqlConnection oCn = new SqlConnection())
{
    oCn.ConnectionString = @"server=sql-server\cos;integrated security=SSPI;database=daas5";
    oCn.Open();

    // Create a SQL command object.
    string strSQL = "SELECT * FROM SettingsC FOR XML AUTO";

    SqlCommand myCommand = new SqlCommand(strSQL, oCn);
    //Read you query into an XmlReader
    XmlReader reader = myCommand.ExecuteXmlReader();        
}

Once you have that, you can easily load this into an XDocument

XDocument doc = XDocument.Load(reader);

or an XmlDocument

XmlDocument xdoc = new XmlDocument();
xdoc.Load(reader);

Upvotes: 1

Related Questions