Quadcap Embeddable Database

com.quadcap.sql.PredicateCursor Class Reference

Inheritance diagram for com.quadcap.sql.PredicateCursor:

com.quadcap.sql.FilterCursor com.quadcap.sql.CursorImpl com.quadcap.sql.TupleImpl com.quadcap.sql.Cursor com.quadcap.sql.Tuple Externalizable com.quadcap.sql.Tuple List of all members.

Detailed Description

Cursor for WHERE predicates.

Author:
Stan Bailes

Definition at line 56 of file PredicateCursor.java.

Public Member Functions

 PredicateCursor (Session session, Cursor cursor, Expression predicate) throws SQLException
 A PredicateCursor is a kind of FilterCursor which only returns rows which match a predicate.

Row getRow () throws SQLException
 Return the current cursor row.

boolean next () throws SQLException
 Cursor.next() Advance the cursor and return 'true' if the cursor advances past a valid item.

boolean prev () throws SQLException
 Cursor.next() Retreat the cursor and return 'true' if the cursor moves past a valid item.

boolean absolute (int row) throws SQLException
 Position the cursor to the specified absolute row.

String toString ()
 Return a string representation for debugging.


Package Attributes

Expression predicate = null
Row row = null

Constructor & Destructor Documentation

com.quadcap.sql.PredicateCursor.PredicateCursor (  Session  session,
Cursor  cursor,
Expression  predicate
)  throws SQLException
 

A PredicateCursor is a kind of FilterCursor which only returns rows which match a predicate.

Definition at line 64 of file PredicateCursor.java.

References com.quadcap.sql.PredicateCursor.predicate.

Member Function Documentation

boolean com.quadcap.sql.PredicateCursor.absolute (  int  row  )  throws SQLException
 

Position the cursor to the specified absolute row.

The first row is row '1', and the last row is '-1', as in JDBC.

Reimplemented from com.quadcap.sql.FilterCursor.

Definition at line 113 of file PredicateCursor.java.

References com.quadcap.sql.PredicateCursor.absolute(), com.quadcap.sql.FilterCursor.afterLast(), com.quadcap.sql.FilterCursor.beforeFirst(), com.quadcap.sql.PredicateCursor.next(), com.quadcap.sql.PredicateCursor.prev(), and com.quadcap.sql.PredicateCursor.row.

Referenced by com.quadcap.sql.PredicateCursor.absolute().

Row com.quadcap.sql.PredicateCursor.getRow (   )  throws SQLException [virtual]
 

Return the current cursor row.

Reimplemented from com.quadcap.sql.FilterCursor.

Definition at line 73 of file PredicateCursor.java.

References com.quadcap.sql.PredicateCursor.row.

boolean com.quadcap.sql.PredicateCursor.next (   )  throws SQLException [virtual]
 

Cursor.next() Advance the cursor and return 'true' if the cursor advances past a valid item.

This item becomes the current row.

Reimplemented from com.quadcap.sql.FilterCursor.

Definition at line 81 of file PredicateCursor.java.

References com.quadcap.sql.Cursor.getRow(), com.quadcap.sql.Expression.getValue(), com.quadcap.sql.Cursor.next(), com.quadcap.sql.PredicateCursor.predicate, and com.quadcap.sql.PredicateCursor.row.

Referenced by com.quadcap.sql.PredicateCursor.absolute().

boolean com.quadcap.sql.PredicateCursor.prev (   )  throws SQLException
 

Cursor.next() Retreat the cursor and return 'true' if the cursor moves past a valid item.

This item becomes the current row.

Reimplemented from com.quadcap.sql.FilterCursor.

Definition at line 98 of file PredicateCursor.java.

References com.quadcap.sql.Cursor.getRow(), com.quadcap.sql.Expression.getValue(), com.quadcap.sql.PredicateCursor.predicate, com.quadcap.sql.Cursor.prev(), and com.quadcap.sql.PredicateCursor.row.

Referenced by com.quadcap.sql.PredicateCursor.absolute().

String com.quadcap.sql.PredicateCursor.toString (   ) 
 

Return a string representation for debugging.

Reimplemented from com.quadcap.sql.FilterCursor.

Definition at line 126 of file PredicateCursor.java.

Member Data Documentation

Expression com.quadcap.sql.PredicateCursor.predicate = null [package]
 

Definition at line 57 of file PredicateCursor.java.

Referenced by com.quadcap.sql.PredicateCursor.next(), com.quadcap.sql.PredicateCursor.PredicateCursor(), and com.quadcap.sql.PredicateCursor.prev().

Row com.quadcap.sql.PredicateCursor.row = null [package]
 

Definition at line 58 of file PredicateCursor.java.

Referenced by com.quadcap.sql.PredicateCursor.absolute(), com.quadcap.sql.PredicateCursor.getRow(), com.quadcap.sql.PredicateCursor.next(), and com.quadcap.sql.PredicateCursor.prev().