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Executing Stored Procedures and Functions From PHP in Windows : Page 2

Discover how to call stored procedures and functions in MySQL from PHP using three database extensions: MySQL, MySQLi, and PDO.


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Calling Stored Procedures from PHP

To call MySQL stored procedures and functions from PHP, you need the following database extensions:

After installing those extensions, you'll be able to call MySQL stored procedures and functions from PHP. As mentioned earlier, stored procedures and functions in MySQL are associated with a specific database. The examples in this section use a books database created using this SQL statement:



create table bookstore (id int not null auto_increment primary key, book varchar(50), author varchar(50), isbn varchar(50), price int);

The SQL statements used to populate the bookstore table from Figure 1 are:

INSERT INTO bookstore (id,book,author,isbn,price) VALUES (1,"Introduction to PHP","Mark User","3334-4424-334-3433",500) INSERT INTO bookstore (id,book,author,isbn,price) VALUES (2,"DHTML and CSS","Teague Sanders","4545-23-23-23-23232",1500) INSERT INTO bookstore (id,book,author,isbn,price) VALUES (3,"Introduction to PHP","Weeling Tom","4334-2323-23233-434",300) INSERT INTO bookstore (id,book,author,isbn,price) VALUES (4," Web design"," Weeling Tom"," 4334-2323-23233-434",600) INSERT INTO bookstore (id,book,author,isbn,price) VALUES (5," PHP 5"," Weeling Tom"," 444-87-67665-678678",600) INSERT INTO bookstore (id,book,author,isbn,price) VALUES (6," JavaServer Pages"," Tick Own"," 897-9898-987-099",800)

 
Figure 1. Bookstore Table: The figure shows the table contents and structure from the books database

Figure 1 shows the table bookstore structure and some sample content.

Call Stored Procedures Using the MySQL Database Extension

The MySQL database extension gives you access to the MySQL database server. You install the php_mysql.dll like any other extension. You can find more information about the MySQL functions here.

First, you need a simple stored procedure. This one, called proc, selects all the fields in the bookstore table created earlier.

CREATE PROCEDURE proc ( ) BEGIN SELECT * from bookstore; END

The following PHP script connects to the MySQL server, selects the books database, calls the proc stored procedure, which has no arguments, and outputs the result:

<?php //Create the connecting to MySQL $con = mysql_connect('localhost','root','',false,65536); mysql_select_db('books'); //Call the proc() procedure $result= mysql_query("CALL proc();") or die(mysql_error()); //Output the result while($row = mysql_fetch_row($result)) { for($i=0;$i<=6;$i++){ echo $row[$i]."<br>"; } echo "---"; } //Close the connection mysql_close($con); ?>

Author's Note: Using the syntax $con = mysql_connect('localhost','root',''); will not work, because to return a result set from a stored procedure to PHP, you must use either the multiple-statements connect option or the multiple-results option (or both). If the routine does not return a result set, neither option is required.

The output is:

1---Introduction to PHP---Mark User---3334-4424-334-3433---500-------- 2---DHTML and CSS---Teague Sanders---4545-23-23-23-23232---1500------- 3---Introduction to PHP---Weeling Tom---4334-2323-23233-434---300----- 4---Web design---Weeling Tom---4334-2323-23233-434---600--------- 5---PHP 5---Weeling Tom---444-87-67665-678678---600--------- 6---JavaServer Pages---Tick Own---897-9898-987-099---800---------

Here's a procedure example, named total_price, calculates the total of the price field from the bookstore table. It uses an OUT parameter to hold the total:

CREATE PROCEDURE total_price ( OUT total int) BEGIN SELECT sum(price) into total from bookstore; END

The following PHP script calls the total_price procedure and displays the result using the OUT parameter total, which is an int:

<?php $con = mysql_connect('localhost','root','',false,65536); mysql_select_db('books'); //Calling the total_price stored procedure using the @t OUT parameter $result= mysql_query("CALL total_price(@t);") or die(mysql_error()); //Listing the result $rs = mysql_query( 'SELECT @t' ); while($row = mysql_fetch_row($rs)) { echo 'The total price is = '.$row[0]; } mysql_close($con); ?>

The output is:

The total price is = 4300

Calling Stored Functions Using the MySQL Extension

To illustrate making stored function calls here's a simple stored function:

CREATE FUNCTION simple_operation (price int) RETURNS int(11) RETURN price*1000

The simple_operation function takes an integer argument, makes a simple calculation and returns an integer.

<?php $con = mysql_connect('localhost','root','',false,65536); mysql_select_db('books'); //Calling the simple_operation function $rs = mysql_query( 'SELECT simple_operation(5)' ); while($row = mysql_fetch_row($rs)) { echo 'The total price is = '.$row[0]; } mysql_close($con); ?>

The output is:

The total price is = 5000



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