Can Multiple SQL Queries Be Executed in a Single PHP Statement?

Executing Multiple SQL Queries in a Single Statement with PHP

Question:

Can multiple SQL queries be consolidated into a single statement in PHP?

Context:

The question relates to a scenario where multiple SQL queries are being executed separately:

$query = "DELETE FROM aktywne_kody WHERE kodsms ='$kodSMSgracza' AND typkodu ='$id'";
mysql_query($query) or die(mysql_error());

$query = "INSERT INTO uzyte_kody (gracz, kodsms, typkodu) VALUES ('$nickGracza', '$kodSMSgracza', '$id')";
mysql_query($query) or die("Błąd MySQL X04");

$query = "INSERT INTO do_odebrania (gracz, itemDATA, itemQTY) VALUES ('$nickGracza', '$itemDATA', '$itemQTY')";
mysql_query($query) or die("Błąd MySQL X05");

Answer:

Yes, it is possible to execute multiple SQL queries in a single statement in PHP using a specific parameter for mysql_connect().

Pass 65536 as the fifth parameter to mysql_connect():

$conn = mysql_connect('localhost','username','password', true, 65536 /* here! */) or die("cannot connect");
mysql_select_db('database_name') or die("cannot use database");

Once this parameter is set, multiple SQL queries can be executed in a single statement:

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
");

It's important to note that when working with functions like mysql_fetch_* or mysql_num_rows, or mysql_affected_rows, only the first statement in the multiple queries will be processed. Functions like mysql_affected_rows can be used to retrieve the number of rows inserted or affected by the first query. However, functions like mysql_fetch_* will return values only for the first query and not for subsequent queries in the statement.

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