TAILIEUCHUNG - PHP 5/MySQL Programming- P87

PHP 5/MySQL Programming- P87:computer programming has often been seen as a difficult and arcane skill. Programming languages are difficult and complicated, out of the typical person’s reach. However, the advent of the World Wide Web has changed that to some extent. It’s reasonably easy to build and post a Web page for the entire world to see. The language of the Web is reasonably simple, and numerous applications are available to assist in the preparation of static pages | 408 PHP 5 MySQL Programming for the Absolute Beginner The mainButton function uses the value of mainProgram to build a link back to the primary screen in every other document produced by the system. Connecting to the Database The connectToSpy function is fundamental to the spy system. It uses systemlevel variables to generate a database connection. It returns an error message if it is unable to connect to the database. The mysql_error function prints an SQL error message if the data connection was unsuccessful. This information may not be helpful to the end user but it might give you some insight as you are debugging the system. function connectToSpy connects to the spy DB global serverName userName password dbConn mysql_connect serverName userName password if dbConn print h3 problem connecting to database. h3 n end if select mysql_select_db chapter12 if select print mysql_error . br n end if return dbConn end connectToSpy The connectToSpy function returns a connection to the database that is subsequently used in the many queries passed to the database throughout the system s life span. Creating a Quick List from a Query I created a few functions in the spyMaster library that didn t get used in the project s final version. The qToList function is a good example. This program takes any SQL query and returns a simply formatted HTML segment describing the data. I find this format useful when debugging because no complex formatting gets in the way. function qToList query given a query makes a quick list of data global dbConn 409 output result mysql_query query dbConn print dbConn is dbConn br print result is result br while row mysql_fetch_assoc result foreach row as col val output . col val br n end foreach output . hr n end while return output end qToList Building an HTML Table from a Query The qToTable function is a little more powerful than qToList . It can build an HTML table from any valid SQL SELECT statement. The code uses the mysql_fetch_field function to .

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