ASP.NET Web PDF Document Viewer/Editor Control Library

0' encoding='utf-8' > <configuration> <connectionStrings> <add name="MyCS" connectionString="Data Source='localhost';Initial Catalog='company'" /> </connectionStrings> </configuration> This defines a new connection string called MyCS From within your application, you can read the value of this connection string using the ConfigurationManager class:.

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When creating a scrollable result set, you must also specify sensitivity: A scroll-insensitive result set is a scrollable result set that does not automatically detect certain changes made to the database while the result set is open, thus providing a static view of the underlying data. This is the default behavior. You would need to retrieve a new result set to see changes made to the database. Note that there are several limitations to the way this works in Oracle, as you will see in the section Result Set Limitations and Downgrade Rules. A scroll-sensitive result set is a scrollable result set with a limited ability to detect certain changes made to the underlying result set data in the database from the current session or a different session while the result set is open.

So your responsibility as a transaction supporter is to maintain enough state to track the changes that occur during the transaction, and be able to revert to the original state of the document in the event of a rollback. When the transaction is completed, you should also make appropriate changes to the state of your type to commit any modifications made during the transaction. Here s the implementation of the IEnlistmentNotification interface. (See TransDOM.cs in the App_Code directory of the Web12 project.) public class TransactedXMLDocument : XmlDocument, IEnlistmentNotification { private string orgXml; public void Enlist() { orgXml = this.InnerXml; Transaction.Current.EnlistVolatile(this, EnlistmentOptions.None); }

Updatability refers to the ability to insert, delete, or update rows in a result set and propagate these changes to the database. The updatability of a result set is determined by its concurrency type. Under JDBC 2.0, the following concurrency types are available: Updatable: Updates, inserts, and deletes can be performed on the result set and propagated to the database. Read-only: The result set cannot be modified in any way (the default behavior).

#r "System.Configuration.dll" open System.Configuration open System.Data.SqlClient let cs = ConfigurationManager.ConnectionStrings.Item("MyCS") let conn = new SqlConnection(cs.ConnectionString) For this to work, make sure you reference System.Configuration.dll in your project properties using the -r option, or use the #r directive in your code as above, because this DLL is not automatically included at compile time.

Note The updatability of a result set can be specified independently of the scrollability or sensitivity of

public void Commit(Enlistment enlistment) { orgXml = ""; enlistment.Done(); } public void InDoubt(Enlistment enlistment) { this.LoadXml(orgXml); orgXml = ""; } public void Prepare(PreparingEnlistment preparingEnlistment) { preparingEnlistment.Prepared(); } public void Rollback(Enlistment enlistment) { this.LoadXml(orgXml); orgXml = ""; } } In this implementation you re tracking the state of the XML document at the point it enters into a transaction using the XML representing the tree at that moment. Any changes made to the tree during the transaction will be reflected in the instance via normal processing that occurs from the base class. Only in the case if the transaction is in doubt or rolled back do you need to take action, and you simply restore the document to its original state by reloading the underlying XML. This strategy does force your user to call the Enlist method to tie it into a transaction. By calling EnlistVolatile and passing a reference to your instance (via this), you wire your type into the rest of the transaction processing. The transaction infrastructure will automatically call Commit or Rollback when the outcome of the transaction becomes known. Let s modify the preceding document processing loop to leverage the new transactional functionality of this type. (See TransactedDomTest.aspx in the Web12 project.) private void WithATran() { TransactedXMLDocument dom = new TransactedXMLDocument(); dom.Load(Server.MapPath("Orders.xml")); XmlNode orderElem; XmlNode ordersElem = dom.SelectSingleNode("//Orders"); int orderCount = ordersElem.ChildNodes.Count; for (int i = orderCount - 1; i >= 0; i--) { orderElem = ordersElem.ChildNodes[i];