org.hsqldb
Class Expression

java.lang.Object
  org.hsqldb.Expression

public class Expression

extends Object

To Do:

fredt - move error string literals to Trace

Field Summary

static int	PARAM_IN
static int	PARAM_IN_OUT
static int	PARAM_OUT

Method Summary

boolean	similarTo(Expression exp) Check if the given expression defines similar operation as this expression.
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

PARAM_IN

public static final int PARAM_IN

See Also:

Constant Field Values

PARAM_IN_OUT

public static final int PARAM_IN_OUT

See Also:

Constant Field Values

PARAM_OUT

public static final int PARAM_OUT

See Also:

Constant Field Values

Method Detail

toString

public String toString()

similarTo

public boolean similarTo(Expression exp)

Check if the given expression defines similar operation as this expression. This method is used for ensuring an expression in the ORDER BY clause has a matching column in the SELECT list. This check is necessary with a SELECT DISTINCT query.
In the future we may perform the test when evaluating the search condition to get a more accurate match.