org.castor.cpa.persistence.sql.query
Class Select

java.lang.Object
  org.castor.cpa.persistence.sql.query.Select

All Implemented Interfaces:

QueryObject

public final class Select
extends Object
implements QueryObject

Class to generate SQL select query statements.
Note: Be aware that the SQL statement will be invalid for empty compound conditions.

Version:

$Revision: 8994 $ $Date: 2011-08-02 01:40:59 +0200 (Di, 02 Aug 2011) $

Author:

Ahmad Hassan, Ralf Joachim

Constructor Summary

Select(Qualifier qualifier)
Construct a SQL select statement that selects records of the table provided.

Select(String name)
Construct a SQL select statement that selects records of the table provided.

Method Summary

void	accept(Visitor visitor) Accept method to handle incoming visitors.
void	addFrom(Qualifier qualifier) Appends the provided qualifier to the list of qualifiers to be used to build from-clause.
void	addSelect(Column name) Appends the provided field to the list of fields to be fetched from table.
Condition	getCondition() Get condition that specifies which records to select.
List<Qualifier>	getFrom() Getter returning from-list currently set.
List<Expression>	getSelect() Getter returning list of Expressions currently set.
boolean	hasFrom() Method to check if qualifiers exist to add to from-clause.
boolean	isLocked() Get locked-flag that specifies if query has to be executed in locked mode or not.
void	setCondition(Condition condition) Set condition that specifies which records to select.
void	setLocked(boolean locked) Set locked-flag that specifies if query has to be executed in locked mode or not.
String	toString() Method constructing query string.

Methods inherited from class java.lang.Object

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

Constructor Detail

Select

public Select(String name)

Construct a SQL select statement that selects records of the table provided.

Parameters:

name - Name of the table to select records of.

Select

public Select(Qualifier qualifier)

Construct a SQL select statement that selects records of the table provided.

Parameters:

qualifier - Qualifier to select records of.

Method Detail

addSelect

public void addSelect(Column name)

Appends the provided field to the list of fields to be fetched from table.

Parameters:

name - Column object representing a column to be fetched.

addFrom

public void addFrom(Qualifier qualifier)

Appends the provided qualifier to the list of qualifiers to be used to build from-clause.

Parameters:

qualifier - Qualifier to be added to from-clause.

getSelect

public List<Expression> getSelect()

Getter returning list of Expressions currently set.

Returns:

List of current expressions.

getFrom

public List<Qualifier> getFrom()

Getter returning from-list currently set.

Returns:

From-list currently set.

getCondition

public Condition getCondition()

Get condition that specifies which records to select.

Returns:

Condition that specifies which records to select.

setCondition

public void setCondition(Condition condition)

Set condition that specifies which records to select.

Parameters:

condition - Condition that specifies which records to select.

isLocked

public boolean isLocked()

Get locked-flag that specifies if query has to be executed in locked mode or not.

Returns:

True: execute query in locked mode, False: execute without lock.

setLocked

public void setLocked(boolean locked)

Set locked-flag that specifies if query has to be executed in locked mode or not.

Parameters:

locked - True: execute query in locked mode, False: execute without lock.

hasFrom

public boolean hasFrom()

Method to check if qualifiers exist to add to from-clause.

Returns:

True: List of froms is not empty. False: List of froms is empty.

toString

public String toString()

Method constructing query string.

Overrides:

toString in class Object

Returns:

Constructed query string.

accept

public void accept(Visitor visitor)

Accept method to handle incoming visitors.

Specified by:

accept in interface QueryObject

Parameters:

visitor - Visitor to be handled.