Package simpledb

Interface Summary

Interface	Description
DbFile	The interface for database files on disk.
DbFileIterator	DbFileIterator is the iterator interface that all SimpleDB Dbfile should implement.
Field	Interface for values of fields in tuples in SimpleDB.
OpIterator	OpIterator is the iterator interface that all SimpleDB operators should implement.
Page	Page is the interface used to represent pages that are resident in the BufferPool.
PageId	PageId is an interface to a specific page of a specific table.

Class Summary

Class	Description
AbstractDbFileIterator	Helper for implementing DbFileIterators.
BufferPool	BufferPool manages the reading and writing of pages into memory from disk.
Catalog	The Catalog keeps track of all available tables in the database and their associated schemas.
Database	Database is a class that initializes several static variables used by the database system (the catalog, the buffer pool, and the log files, in particular.)
Debug	Debug is a utility class that wraps println statements and allows more or less command line output to be turned on.
HeapFile	HeapFile is an implementation of a DbFile that stores a collection of tuples in no particular order.
HeapFileEncoder	HeapFileEncoder reads a comma delimited text file or accepts an array of tuples and converts it to pages of binary data in the appropriate format for simpledb heap pages Pages are padded out to a specified length, and written consecutive in a data file.
HeapPage	Each instance of HeapPage stores data for one page of HeapFiles and implements the Page interface that is used by BufferPool.
HeapPageId	Unique identifier for HeapPage objects.
IntField	Instance of Field that stores a single integer.
LogFile	The format of the log file is as follows: The first long integer of the file represents the offset of the last written checkpoint, or -1 if there are no checkpoints All additional data in the log consists of log records.
Permissions	Class representing requested permissions to a relation/file.
Predicate	Predicate compares tuples to a specified Field value.
RecordId	A RecordId is a reference to a specific tuple on a specific page of a specific table.
SeqScan	SeqScan is an implementation of a sequential scan access method that reads each tuple of a table in no particular order (e.g., as they are laid out on disk).
SimpleDb
StringField	Instance of Field that stores a single String of a fixed length.
TransactionId	TransactionId is a class that contains the identifier of a transaction.
Tuple	Tuple maintains information about the contents of a tuple.
TupleDesc	TupleDesc describes the schema of a tuple.
TupleDesc.TDItem	A help class to facilitate organizing the information of each field
TupleIterator	Implements a OpIterator by wrapping an Iterable.
Utility	Helper methods used for testing and implementing random features.

Enum Summary

Enum	Description
Predicate.Op	Constants used for return codes in Field.compare
Type	Class representing a type in SimpleDB.

Exception Summary

Exception	Description
DbException	Generic database exception class
DeadlockException	Exception that is thrown when a deadlock occurs.
TransactionAbortedException	Exception that is thrown when a transaction has aborted.