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isReadOnlyQuery

Applies To

ADOdb Load Balancer

Syntax

 bool isReadOnlyQuery(
       string $sql
       )

Description

The method isReadOnly() reads a provided SQL statement for elements that might cause a read-write process to be created. The method is used internally by the load balancer to determine if a statement needs to be executed on the primary server but can also be called manually.

Usage

/*
* connection to load balancer assumed
*/
 
$SQL = "SELECT * FROM employees";
 
print $db->isReadOnlySql($SQL);
 
/*
* Returns false
*/
 
SQL = "SELECT * FROM employees FOR UPDATE";
 
print $db->isReadOnlySql($SQL);
 
/*
* Returns true
*/