Package com.mckoi.database

Class ViewManager

java.lang.Object

com.mckoi.database.ViewManager

public class ViewManager
extends java.lang.Object

A DatabaseConnection view manager. This controls adding, updating, deleting, and processing views inside the system view table.

Author:

Tobias Downer

Method Summary

Modifier and Type	Method	Description
QueryPlanNode	createViewQueryPlanNode(TableName view_name)	Returns a freshly deserialized QueryPlanNode object for the given view object.
void	defineView(ViewDef view, SQLQuery query, User user)	Defines a view.
boolean	deleteView(TableName view_name)	Deletes the view with the given name, or returns false if no entries were deleted from the view table.
boolean	viewExists(TableName view_name)	Returns true if the view with the given name exists.

Methods inherited from class java.lang.Object

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

Method Detail

viewExists

public boolean viewExists(TableName view_name)

Returns true if the view with the given name exists.

defineView

public void defineView(ViewDef view,
                       SQLQuery query,
                       User user)
                throws DatabaseException

Defines a view. If the view with the name has not been defined it is defined. If the view has been defined then it is overwritten with this information.

Parameters:

view - information that defines the view.

query - the query that forms the view.

user - the user that owns this view being defined.

Throws:

DatabaseException

deleteView

public boolean deleteView(TableName view_name)
                   throws DatabaseException

Deletes the view with the given name, or returns false if no entries were deleted from the view table.

Throws:

DatabaseException

createViewQueryPlanNode

public QueryPlanNode createViewQueryPlanNode(TableName view_name)

Returns a freshly deserialized QueryPlanNode object for the given view object.