ASP.NET Web PDF Document Viewer/Editor Control Library

Let s look at an example Java class, DemoProxyConnection, in which the account midtier proxies for the end user accounts db_clerk1 and db_manager1. After the necessary imports, in the main() method, we verify the existence of a single command-line parameter the end user account to proxy for: /* This program demonstrates proxy authentication. * COMPATIBLITY NOTE: tested against 10.1.0.2.0, 9.2.0.1.0. */

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heavily, partly because functional programmers often dislike extensive capitalization. Furthermore, OCaml code uses underscores everywhere. However, beware that the style is often disliked by others who have a choice about whether to use it. It has the advantage that abbreviations can be used in identifiers without them being run together.

import java.sql.SQLException; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.CallableStatement; import java.sql.ResultSet; import java.util.Properties; import oracle.jdbc.pool.OracleOCIConnectionPool; import book.util.JDBCUtil; class DemoProxyConnection { public static void main(String args[]) throws Exception { if( args.length != 1 ) { System.out.println( "Usage: java DemoProxyConnection <end_user>"); System.exit( 1 ); } String endUser = args[0]; Next, we create the OCI connection pool and set the connection URL for connecting using the OCI JDBC driver. We set the credentials to connect as the midtier account: OracleOCIConnectionPool oocp = new OracleOCIConnectionPool(); oocp.setURL ( "jdbc:oracle:oci:@" ); oocp.setUser("midtier"); // username oocp.setPassword("midtier"); // password To proxy for the end user account, we first set a Properties object in which we set the property OracleOCIConnectionPool.PROXY_USER_NAME to the end user we want to proxy for. The parameter OracleOCIConnectionPool.PROXY_USER_NAME represents one of the four proxy modes that we will discuss in the section Proxy Authentication Modes later. The value OracleOCI ConnectionPool.PROXY_USER_NAME for this parameter, in particular, indicates that we wish to authenticate by supplying the username: Properties endUserProps = new Properties(); endUserProps.setProperty( OracleOCIConnectionPool.PROXY_USER_NAME, Connection conn = null; try { endUser );

Helper method to declare a page-level array. Accepts two strings, the array name, and the array declaration. When the page renders, these strings do a little bit of code generation to wrap the array in a script block and initialize it. Generates a client-side script function call to do an out-ofband asynchronous callback to the server on a background thread of the browser. See the Out-of-Band Callbacks section that follows for details. Accepts two strings, the first being a name for the script block, and the second being a string containing the script you want added to the page. Dynamically generate this string, load it from the database, or load it from some other source of persistence. Accepts two strings, a name for the registration, and the name of the JavaScript file to include. Script includes give you a clean separation of the script from your markup, and allows the browser to cache a script file used from several pages, reducing total page size.

Recommendation: Follow the .NET guidelines for exceptions. The .NET Framework Design Guidelines give good advice on the use of exceptions in the context of all .NET programming. Some of these guidelines are as follows: Do not return error codes. Exceptions are the main way of reporting errors in frameworks. Do not use exceptions for normal flow of control. Although this technique is often used in languages such as OCaml, it is bug-prone and furthermore slow on .NET. Instead consider returning a None option value to indicate failure. Do document all exceptions thrown by your code when a function is used incorrectly. Where possible throw existing exceptions in the System namespaces. Do not throw System.Exception or System.SystemException. Use failwith, failwithf, raise System.ArgumentException, and raise System. InvalidOperationException as your main techniques to throw exceptions.

The proxy connection is obtained by invoking the method getProxyConnection(): conn = oocp.getProxyConnection( OracleOCIConnectionPool.PROXYTYPE_USER_NAME, endUserProps ); The second parameter is the Properties object that we populated earlier with the end user account passed as the command-line parameter. Next, we print a success message and invoke the following two functions defined later in the class: _displayEnabledRoles(): Displays all roles enabled for a connection _enableRole(): Enables a given role or set of roles for a connection

Note Other exception-related topics covered by the .NET guidelines include advice on designing custom