org.datanucleus.store.rdbms.sql

Class SQLColumn

java.lang.Object

org.datanucleus.store.rdbms.sql.SQLColumn

public class SQLColumn
extends Object

Representation of a column reference in an SQL statement. Has a column, and an optional alias. TODO Merge this with ColumnExpression

Field Summary

Fields

Modifier and Type	Field and Description
protected DatastoreIdentifier	alias Alias for the column, for use in a SELECT clause.
protected Column	column The column being referenced.
protected SQLTable	table The SQL Table that we are selecting columns from.

Constructor Summary

Constructors

Constructor and Description
SQLColumn(SQLTable table, Column col, DatastoreIdentifier alias) Constructor for a column reference.

Method Summary

Modifier and Type	Method and Description
DatastoreIdentifier	getAlias()
Column	getColumn()
String	getColumnSelectString()
SQLTable	getTable()
String	toString() Stringifier method to return this "column" in a form for use in SQL statements.

Methods inherited from class java.lang.Object

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

Field Detail

table

protected SQLTable table

The SQL Table that we are selecting columns from.

column

protected Column column

The column being referenced.

alias

protected DatastoreIdentifier alias

Alias for the column, for use in a SELECT clause.

Constructor Detail

SQLColumn

public SQLColumn(SQLTable table,
                 Column col,
                 DatastoreIdentifier alias)

Constructor for a column reference.

Parameters:

table - The SQLTable being selected

col - The column

alias - An alias

Method Detail

getTable

public SQLTable getTable()

getColumn

public Column getColumn()

getAlias

public DatastoreIdentifier getAlias()

toString

public String toString()

Stringifier method to return this "column" in a form for use in SQL statements. This can be of the following form(s)

 TABLEALIAS.MYCOLUMN AS COLUMNALIAS
 MYTABLE.MYCOLUMN AS COLUMNALIAS
 TABLEALIAS.MYCOLUMN
 MYTABLE.MYCOLUMN
 

Also applies any "select-function" defined on the Column.

Overrides:

toString in class Object

Returns:

The String form for use

getColumnSelectString

public String getColumnSelectString()