net.sourceforge.pbeans
Interface Operator

All Known Implementing Classes:

SimpleOperator

public interface Operator

Operator generates an SQL operation on two expressions.

Author:

Marius Siegas

Field Summary

static Operator	EQUALS Common operator equals ("=").
static Operator	GREATER_THAN Operator greater than (">").
static Operator	IN
static Operator	IS Operator is (" IS ") for comparing to null.
static Operator	LESS_THAN Operator less than ("<").
static Operator	LIKE

Method Summary

java.lang.String	operation(java.lang.String variable, java.lang.String value) Generates SQL operation using given expressions as arguments.
java.lang.String	operatorString()

Field Detail

EQUALS

static final Operator EQUALS

Common operator equals ("="). Automaticaly replaced to IS when comparing to null value.

IS

static final Operator IS

Operator is (" IS ") for comparing to null.

See Also:

EQUALS

LESS_THAN

static final Operator LESS_THAN

Operator less than ("<").

GREATER_THAN

static final Operator GREATER_THAN

Operator greater than (">").

LIKE

static final Operator LIKE

IN

static final Operator IN

Method Detail

operation

java.lang.String operation(java.lang.String variable,
                           java.lang.String value)

Generates SQL operation using given expressions as arguments. The resulting string should containt the two specified strings in it. Also there must be enough spacing around operation (if needed) for it not to collapse with expressions.

Parameters:

variable - variable expression (i.e. left-hand expression).

value - value expression (i.e. right-hand expression).

Returns:

generated string containing variable, value and the operation(-s) performed on them.

operatorString

java.lang.String operatorString()