org.melati.poem
Class CachedQuery

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

Direct Known Subclasses:

CachedCount, CachedSelection

public abstract class CachedQuery
extends Object

Object to return the results of a query with caching.

Cached results will be returned unless the relevant tables have been updated since the query was last executed, in which case the results will be recomputed.

Field Summary

protected Vector<Integer>	rows
protected PreparedStatementFactory	statements
protected Table	table

Constructor Summary

CachedQuery(Table table, String query, Table[] otherTables)
Constructor.

Method Summary

protected void	compute()
protected Object	extract(ResultSet rs)
Table	getTable()
protected void	setQuery(String query) Used in constructor of CachedSelection.
protected PreparedStatementFactory	statements()
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

statements

protected PreparedStatementFactory statements

rows

protected Vector<Integer> rows

table

protected Table table

Constructor Detail

CachedQuery

public CachedQuery(Table table,
                   String query,
                   Table[] otherTables)

Constructor.

Parameters:

table - the table to select from

query - the SQL query string

otherTables - an array of other tables involved in the query

Method Detail

statements

protected PreparedStatementFactory statements()

extract

protected Object extract(ResultSet rs)
                  throws SQLException

Throws:

SQLException

compute

protected void compute()

getTable

public Table getTable()

Returns:

the table property

setQuery

protected void setQuery(String query)

Used in constructor of CachedSelection.

Parameters:

query - the query to set

toString

public String toString()

Overrides:

toString in class Object

See Also:

Object.toString()