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A view is an alternative representation of data from one or more tables or views. A view can include all or some of the columns contained in one or more tables on which it is defined. A view is effectively a SQL query stored in the database catalog. Some database vendors, including Oracle, support the concept of views, while others, such as MySQL, do not at the present time (however, MySQL will support views starting with version 5.0). Therefore, a view is a virtual table and can be defined by SQL statements, but it may be vendor dependent. In general, views can be used for security purposes, such as hiding a salary field, or for the convenience of programmers or database administrators. Views enable the user to see only the information he or she needs at the moment, and provides security for the database managers. Using DatabaseMetaData.getTables(catalog, schemaPattern, tableNamePattern, types) method, and by passing {"VIEW"} to the types parameter, you can get a list of views belonging to a database user. For Oracle databases, this method returns user-defined and system views. To get only user-created views, I use Oracle s metadata table, user_objects, which includes user-created tables and views. To get the views, use the following query: select object_name from user_objects where object_type = 'VIEW'; To get the tables and views together, you can issue: select object_name from user_objects where object_type = 'TABLE' or object_type = 'VIEW';

Again, you cannot tell that there are many threads taking their turn at the hardware because the cycle is so fast To start a new process and the first thread associated with it, all you need to do is call the ProcessStart() method The code in Listing 5-2 shows how to start the Calculator using the ProcessStart() method Listing 5-2 Starting a New Process and Its First Thread VB NET Private Sub Button1_Click(ByVal sender As SystemObject, __ ByVal e As SystemEventArgs) Handles Button1Click ProcessStart("Calcexe") End Sub C# private void button1_Click(object sender, EventArgs e) { ProcessStart("Calcexe"); } This code will open up the Calculator when button1 is clicked You can make this code more flexible by creating an additional procedure with the same code and calling the new procedure from this button s Click event procedure.

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You ll find lots of open source code that you can use as the basis for your own serverside implementation; one of the best examples is PHP APNS available on Google Code:

Moving this code to its own procedure will make it independent of any particular events This means that you can call the procedure from different places in your application At this stage, you should write out comments about what you want the procedure to do This will help you focus your efforts and keep your routines simple and direct Listing 5-3 shows some sample pseudocode comments..

http://code.google.com/p/php-apns/

Consider the following table, which lists names of employees and their salaries: create table MyPayrollTable( id varchar(9) not null primary key, name varchar(30) not null, salary int not null ); If you want the employee names available but not their salaries, you can define the following view: create view EmployeeNamesView (id, name) as select id, name from MyPayrollTable; Here is how the EmployeeNamesView is created in the Oracle 9i SQL*Plus program: $ sqlplus octopus/octopus SQL*Plus: Release 9.2.0.1.0 - Production on Mon Dec 2 14:08:29 2002 Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production SQL> create table MyPayrollTable( 2 id varchar(9) not null primary key, 3 name varchar(30) not null, 4 salary int not null 5 ); Table created. SQL> create view MyView2 (id, name) 2 as select id, name from MyPayrollTable; View created. SQL> describe MyView2; Name Null Type --------------------- -------- -----------ID NOT NULL VARCHAR2(9) NAME NOT NULL VARCHAR2(30) SQL> select object_name from user_objects where object_type='VIEW'; OBJECT_NAME ----------MYVIEW2

Listing 5-3. Pseudocode for Running an Application VB .NET Public Class Form1 Public Sub StartProgram(ByVal strAppname As String) 'This routine will start a new process with the name and 'path contained in strAppname. 'TODO If a log file does not exist, it will create one Process.Start(strAppname) 'TODO Add code to log start time. End Sub C# public void StartProgram(string strAppName) { //This routine will start a new process with the name and //path contained in strAppname . //TODO If a log file does not exist, it will call a routine to create one.

This is a great example of a message queue based daemon written in PHP using memcacheq and available under the LGPL license and including fully public domain code.

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