Executing Multiple SQL Queries in One Statement with PHP
In this programming conundrum, the user seeks a method to combine multiple SQL queries into a single statement. They have provided sample code that consists of three separate queries:
DELETE FROM aktywne_kody WHERE kodsms ='$kodSMSgracza' AND typkodu ='$id'; mysql_query($query) or die(mysql_error()); INSERT INTO uzyte_kody (gracz, kodsms, typkodu) VALUES ('$nickGracza', '$kodSMSgracza', '$id'); mysql_query($query) or die("Błąd MySQL X04"); INSERT INTO do_odebrania (gracz, itemDATA, itemQTY) VALUES ('$nickGracza', '$itemDATA', '$itemQTY'); mysql_query($query) or die("Błąd MySQL X05");
Solution
To execute multiple SQL queries in one statement using PHP and MySQL, the key is to pass 65536 as the fifth parameter during the mysql_connect initialization. Here's an example:
$conn = mysql_connect('localhost','username','password', true, 65536 /* here! */) or die("cannot connect"); mysql_select_db('database_name') or die("cannot use database"); mysql_query(" INSERT INTO table1 (field1,field2) VALUES(1,2); INSERT INTO table2 (field3,field4,field5) VALUES(3,4,5); DELETE FROM table3 WHERE field6 = 6; UPDATE table4 SET field7 = 7 WHERE field8 = 8; INSERT INTO table5 SELECT t6.field11, t6.field12, t7.field13 FROM table6 t6 INNER JOIN table7 t7 ON t7.field9 = t6.field10; -- etc ");
In this example, all of the queries will be executed sequentially as part of a single statement. It's important to note that subsequent commands such as mysql_fetch_*, mysql_num_rows, and mysql_affected_rows will only be valid for the first executed query.
mysql_close Question
Regarding the question about closing the database connection, it is generally recommended to call mysql_close($db) after finishing all SQL queries to release the connection and free up resources.
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