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

protected org.datanucleus.store.mapped.DatastoreIdentifier	alias Alias for the column, for use in a SELECT clause.
protected org.datanucleus.store.mapped.DatastoreField	column The column being referenced.
protected SQLTable	table The SQL Table that we are selecting columns from.

Constructor Summary

SQLColumn(SQLTable table, org.datanucleus.store.mapped.DatastoreField col, org.datanucleus.store.mapped.DatastoreIdentifier alias)
Constructor for a column reference.

Method Summary

org.datanucleus.store.mapped.DatastoreIdentifier	getAlias()
org.datanucleus.store.mapped.DatastoreField	getColumn()
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 org.datanucleus.store.mapped.DatastoreField column

The column being referenced.

alias

protected org.datanucleus.store.mapped.DatastoreIdentifier alias

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

Constructor Detail

SQLColumn

public SQLColumn(SQLTable table,
                 org.datanucleus.store.mapped.DatastoreField col,
                 org.datanucleus.store.mapped.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 org.datanucleus.store.mapped.DatastoreField getColumn()

getAlias

public org.datanucleus.store.mapped.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