Issue 1851: Fix PHP Warnings and notices in DB Classes

git-svn-id: http://xe-core.googlecode.com/svn/branches/1.5.0@10537 201d5d3c-b55e-5fd7-737f-ddc643e51545

classes/db/queryparts/expression/InsertExpression.class.php

@@ -31,6 +31,14 @@
 		function getArgument(){
 			return $this->argument;
 		}
+
+		function getArguments()
+		{
+			if ($this->argument)
+			    return array($this->argument);
+			else
+			    return array();
+		}
 	}
 
-?>
+?>

classes/db/queryparts/expression/SelectExpression.class.php

@@ -33,8 +33,13 @@
 			return null;
 		}
 
+		function getArguments()
+		{
+		    return array();
+		}
+
                 function isSubquery(){
                     return false;
                 }
 	}
-?>
+?>

classes/db/queryparts/expression/StarExpression.class.php

@@ -16,5 +16,10 @@
 		function getArgument(){
 			return null;
 		}
+
+		function getArguments(){
+		    // StarExpression has no arguments
+			return array();
+		}
 	}
-?>
+?>

classes/db/queryparts/expression/UpdateExpression.class.php

@@ -52,7 +52,15 @@
 		function getArgument(){
 			return $this->argument;
 		}
+
+		function getArguments()
+		{
+		    if ($this->argument)
+			return array($this->argument);
+		    else
+			return array();
+		}
 	}
 
 
-?>
+?>