query
Class Catalog

java.lang.Object
  query.Catalog

All Implemented Interfaces:

GlobalConst

public class Catalog
extends java.lang.Object
implements GlobalConst

Minibase System Catalog

Maintains metadata about every table, column, and index in the database; this information itself is stored in tables (i.e. heap files).

Field Summary

Fields inherited from interface global.GlobalConst

EMPTY_SLOT, FIRST_PAGEID, INVALID_PAGEID, MAX_COLSIZE, MAX_TUPSIZE, NAME_MAXLEN, PAGE_SIZE, PIN_DISKIO, PIN_MEMCPY, UNPIN_CLEAN, UNPIN_DIRTY

Constructor Summary

Catalog(boolean exists)
Opens the system catalog if it exists, otherwise initializes an empty one.

Method Summary

void	createIndex(java.lang.String fileName, java.lang.String ixTable, java.lang.String ixColumn) Adds a newly created index to the catalog.
void	createTable(java.lang.String fileName, Schema schema) Adds a newly created table to the catalog.
void	dropIndex(java.lang.String fileName) Removes an existing index from the catalog.
void	dropTable(java.lang.String fileName) Removes an existing table from the catalog.
RID	getFileRID(java.lang.String fileName, boolean isTable) Gets the RID of the file's catalog entry, or null if it doesn't exist.
IndexDesc[]	getIndexes(java.lang.String fileName) Gets any indexes on a given table.
IndexDesc[]	getIndexes(java.lang.String fileName, Schema schema, int[] fldnos) Gets any indexes on a given set of columns.
Schema	getSchema(java.lang.String fileName) Gets the Schema for the given table.

Methods inherited from class java.lang.Object

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

Constructor Detail

Catalog

public Catalog(boolean exists)

Opens the system catalog if it exists, otherwise initializes an empty one.

Parameters:

exists - true if the catalog tables already exist, false otherwise

Method Detail

getFileRID

public RID getFileRID(java.lang.String fileName,
                      boolean isTable)

Gets the RID of the file's catalog entry, or null if it doesn't exist.

Parameters:

fileName - name of the table/index file

isTable - true if a table, false if an index

createTable

public void createTable(java.lang.String fileName,
                        Schema schema)

Adds a newly created table to the catalog.

getSchema

public Schema getSchema(java.lang.String fileName)

Gets the Schema for the given table.

dropTable

public void dropTable(java.lang.String fileName)

Removes an existing table from the catalog.

createIndex

public void createIndex(java.lang.String fileName,
                        java.lang.String ixTable,
                        java.lang.String ixColumn)

Adds a newly created index to the catalog.

getIndexes

public IndexDesc[] getIndexes(java.lang.String fileName)

Gets any indexes on a given table.

getIndexes

public IndexDesc[] getIndexes(java.lang.String fileName,
                              Schema schema,
                              int[] fldnos)

Gets any indexes on a given set of columns.

dropIndex

public void dropIndex(java.lang.String fileName)

Removes an existing index from the catalog.