First (query directive) - Revision history

Olli at 07:57, 21 August 2009

2009-08-21T07:57:56Z

Olli at 07:29, 21 August 2009

2009-08-21T07:29:50Z

Olli: /* Examples */

2009-08-21T07:28:45Z

‎Examples

Olli at 07:28, 21 August 2009

2009-08-21T07:28:35Z

New page

== Description ==

Returns the first or the first N rows of specified directive. May return less than specified number of rows if the inner directive does not return that many rows.

== Constructor ==

First(Directive directive) - Returns the first row of directive.

First(int count, Directive directive) - Returns the first ''count'' rows of directive

== Examples ==

importPackage(org.wandora.query2);
new If(
new Exists(new BaseName().where("#DEFAULT","!=",null)),
new BaseName(),
new First(new SubjectIdentifiers())
)
.from(new Instances())

This returns the base names of the instances of the input topic or the first subject identifier if the base name is not defined.

← Older revision		Revision as of 07:29, 21 August 2009
Line 20:		Line 20:

	This returns the base names of the instances of the input topic or the first subject identifier if the base name is not defined.		This returns the base names of the instances of the input topic or the first subject identifier if the base name is not defined.
		+
		+	[[Category:Query directives]]

@@ Line 13: / Line 13: @@
   importPackage(org.wandora.query2);
   new If(
-    new Exists(new BaseName().where("#DEFAULT","!=",null)),
+    new BaseName().where("#DEFAULT","!=",null),
     new BaseName(),
     new First(new SubjectIdentifiers())