com.mckoi.database.interpret
Class TableSelectExpression

java.lang.Object
  com.mckoi.database.interpret.TableSelectExpression

All Implemented Interfaces:

StatementTreeObject, java.io.Serializable, java.lang.Cloneable

public final class TableSelectExpression
extends java.lang.Object
implements java.io.Serializable, StatementTreeObject, java.lang.Cloneable

A container object for the a table select expression, eg.

               SELECT [columns]
                 FROM [tables]
                WHERE [search_clause]
             GROUP BY [column]
               HAVING [search_clause]
 [composite_function] [table_select_expression]
 

Note that a TableSelectExpression can be nested in the various clauses of this object.

Author:

Tobias Downer

See Also:

Serialized Form

Field Summary

java.util.ArrayList	columns The list of columns to select from.
boolean	distinct True if we only search for distinct elements.
FromClause	from_clause The from clause.
java.util.ArrayList	group_by The list of columns to group by.
Variable	group_max The group max variable or null if no group max.
SearchExpression	having_clause The having clause.
SearchExpression	where_clause The where clause.

Constructor Summary

TableSelectExpression()
Constructor.

Method Summary

void	chainComposite(TableSelectExpression expression, java.lang.String composite, boolean is_all) Chains a new composite function to this expression.
java.lang.Object	clone() Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members.
void	prepareExpressions(ExpressionPreparer preparer) Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.

Methods inherited from class java.lang.Object

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

Field Detail

distinct

public boolean distinct

True if we only search for distinct elements.

columns

public java.util.ArrayList columns

The list of columns to select from. (SelectColumn)

from_clause

public FromClause from_clause

The from clause.

where_clause

public SearchExpression where_clause

The where clause.

group_by

public java.util.ArrayList group_by

The list of columns to group by. (ByColumn)

group_max

public Variable group_max

The group max variable or null if no group max.

having_clause

public SearchExpression having_clause

The having clause.

Constructor Detail

TableSelectExpression

public TableSelectExpression()

Constructor.

Method Detail

chainComposite

public void chainComposite(TableSelectExpression expression,
                           java.lang.String composite,
                           boolean is_all)

Chains a new composite function to this expression. For example, if this expression is a UNION ALL with another expression it would be set through this method.

prepareExpressions

public void prepareExpressions(ExpressionPreparer preparer)
                        throws DatabaseException

Description copied from interface: StatementTreeObject

Prepares all expressions in this statement tree object by passing the ExpressionPreparer object to the 'prepare' method of the expression.

Specified by:

prepareExpressions in interface StatementTreeObject

Throws:

DatabaseException

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Description copied from interface: StatementTreeObject

Performs a DEEP clone of this object if it is mutable, or a deep clone of its mutable members. If the object is immutable then it may return 'this'.

Specified by:

clone in interface StatementTreeObject

Overrides:

clone in class java.lang.Object

Throws:

java.lang.CloneNotSupportedException