Package com.exasol.sql

Class DerivedColumn

java.lang.Object

com.exasol.sql.AbstractFragment

com.exasol.sql.DerivedColumn

All Implemented Interfaces:

InsertFragment, MergeFragment, SelectFragment, Fragment

public class DerivedColumn
extends AbstractFragment
implements SelectFragment, MergeFragment, InsertFragment

This class represents a derived column in an SQL query.

Field Summary

Fields inherited from class com.exasol.sql.AbstractFragment

root

Constructor Summary

Constructors

Constructor	Description
DerivedColumn(Fragment root, ValueExpression valueExpression)	Create a new instance of a DerivedColumn.
DerivedColumn(Fragment root, ValueExpression valueExpression, String derivedColumnName)	Create a new instance of a DerivedColumn.

Method Summary

Modifier and Type	Method	Description
void	accept(InsertVisitor visitor)	Accept a visitor (e.g.
void	accept(MergeVisitor visitor)	Accept a visitor (e.g.
void	accept(SelectVisitor visitor)	Accept a visitor (e.g.
String	getDerivedColumnName()	Get a derived column name.
ValueExpression	getValueExpression()	Get a value expression that belongs to this derived column.
boolean	hasDerivedColumnName()	Check if this function has a derived column name.

Methods inherited from class com.exasol.sql.AbstractFragment

getRoot

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.exasol.sql.Fragment

getRoot

Constructor Detail

DerivedColumn

public DerivedColumn(Fragment root,
                     ValueExpression valueExpression)

Create a new instance of a DerivedColumn.

Parameters:

root - root SQL statement this fragment belongs to

valueExpression - derived column's content

DerivedColumn

public DerivedColumn(Fragment root,
                     ValueExpression valueExpression,
                     String derivedColumnName)

Create a new instance of a DerivedColumn.

Parameters:

root - root SQL statement this fragment belongs to

valueExpression - derived column's content

derivedColumnName - name of a derived column

Method Detail

getValueExpression

public ValueExpression getValueExpression()

Get a value expression that belongs to this derived column.

Returns:

value expression

getDerivedColumnName

public String getDerivedColumnName()

Get a derived column name.

Returns:

derived column name as a String

hasDerivedColumnName

public boolean hasDerivedColumnName()

Check if this function has a derived column name.

Returns:

true if this function has a derived column name

accept

public void accept(SelectVisitor visitor)

Description copied from interface: SelectFragment

Accept a visitor (e.g. a renderer or validator)

Specified by:

accept in interface SelectFragment

Parameters:

visitor - visitor to accept

accept

public void accept(InsertVisitor visitor)

Description copied from interface: InsertFragment

Accept a visitor (e.g. a renderer or validator)

Specified by:

accept in interface InsertFragment

Parameters:

visitor - visitor to accept

accept

public void accept(MergeVisitor visitor)

Description copied from interface: MergeFragment

Accept a visitor (e.g. a renderer or validator).

Specified by:

accept in interface MergeFragment

Parameters:

visitor - visitor to accept