org.melati.poem
Class CachedExists

java.lang.Object
  org.melati.poem.CachedQuery
      org.melati.poem.CachedCount
          org.melati.poem.CachedExists

public class CachedExists
extends CachedCount

A cached instance of an SQL count > 0 query.

Field Summary

Fields inherited from class org.melati.poem.CachedQuery

rows, statements, table

Constructor Summary

CachedExists(Table table, String whereClause)

CachedExists(Table table, String whereClause, Table[] otherTables)
Constructor.

Method Summary

boolean

exists()

Methods inherited from class org.melati.poem.CachedCount

count

Methods inherited from class org.melati.poem.CachedQuery

compute, extract, getTable, setQuery, statements, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

CachedExists

public CachedExists(Table table,
                    String whereClause,
                    Table[] otherTables)

Constructor.

Parameters:

table - the Table we are dealing with

whereClause - SQL snippet

otherTables - Array of other tables referred to in whereClause, if any

CachedExists

public CachedExists(Table table,
                    String whereClause)

Parameters:

table - the Table we are dealing with

whereClause - SQL snippet

Method Detail

exists

public boolean exists()

Returns:

whether any record match the criteria or not