TemporaryDatabase
Class Manager

java.lang.Object
  |
  +--TemporaryDatabase.Manager

All Implemented Interfaces:

DatabaseManager

public class Manager

extends Object

implements DatabaseManager

Database for storage of temporary (in memory) tables.

Author:

chris.studholme@utoronto.ca

Field Summary

private static int	majorVersion
private static int	minorVersion
private static String	pkg
private ArrayList	tables

Constructor Summary

Manager()

Method Summary

boolean	createIndex(String name, String column) Create an index of the specified column in the specified table (if capable).
DatabaseTable	createTable(String name, boolean temporary) Create a new table.
boolean	dropIndex(String name, String column) Drop an index.
void	dropTable(String name) Drop a table.
Function	getFunction(String function_name) Get a database specific function for use in SQL.
int	getMajorVersion() Get the driver's major version number.
int	getMinorVersion() Get the driver's minor version number.
boolean	hasTable(String name) Checks whether this database has the specified table.
DatabaseTable	openTable(String name) Opens the database table with the specified name for read only access.
DatabaseTable	openTable(String name, boolean readonly) Opens the database table with the specified name with read only or read write access.

Methods inherited from class java.lang.Object

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

Field Detail

majorVersion

private static final int majorVersion

minorVersion

private static final int minorVersion

pkg

private static final String pkg

tables

private ArrayList tables

Constructor Detail

Manager

public Manager()

Method Detail

getMajorVersion

public int getMajorVersion()

Description copied from interface: DatabaseManager

Get the driver's major version number. Initially this should be 1.

Specified by:

getMajorVersion in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Returns:

major version number

getMinorVersion

public int getMinorVersion()

Description copied from interface: DatabaseManager

Get the driver's minor version number. Initially this should be 0.

Specified by:

getMinorVersion in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Returns:

minor version number

hasTable

public boolean hasTable(String name)

Description copied from interface: DatabaseManager

Checks whether this database has the specified table.

Specified by:

hasTable in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table

Returns:

true if the table exists in this database and can be opened, false otherwise

Throws:

DatabaseException - if a database-access error occurs

openTable

public DatabaseTable openTable(String name,
                               boolean readonly)
                        throws DatabaseException

Description copied from interface: DatabaseManager

Opens the database table with the specified name with read only or read write access.

Specified by:

openTable in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table to open

readonly - true to open table read only

Returns:

a DatabaseTable object representing the table, or null if the table does not exist in this database

Throws:

DatabaseException - if a database-access error occurs

openTable

public DatabaseTable openTable(String name)
                        throws DatabaseException

Description copied from interface: DatabaseManager

Opens the database table with the specified name for read only access.

Specified by:

openTable in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table to open

Returns:

a DatabaseTable object representing the table, or null if the table does not exist in this database

Throws:

DatabaseException - if a database-access error occurs

createTable

public DatabaseTable createTable(String name,
                                 boolean temporary)
                          throws DatabaseException

Description copied from interface: DatabaseManager

Create a new table. If a table with the given name exists in the database, this method should always throw an exception. If the database is not capable of supporting user created tables, this method should return null.

Specified by:

createTable in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table to create

temporary - table is temporary

Returns:

the newly created table opened for read write access, or null if the database doesn't support creating tables

Throws:

DatabaseException - if a database-access error occurs

dropTable

public void dropTable(String name)
               throws DatabaseException

Description copied from interface: DatabaseManager

Drop a table. This method should throw an exception if the table does not exist.

Specified by:

dropTable in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table to drop

Throws:

DatabaseException - if a database-access error occurs

createIndex

public boolean createIndex(String name,
                           String column)

Description copied from interface: DatabaseManager

Create an index of the specified column in the specified table (if capable).

Specified by:

createIndex in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table to index

columnname - name of the column to index

Returns:

true if index was created, false if database is not capable of creating indicies

Throws:

DatabaseException - if a database-access error occurs

dropIndex

public boolean dropIndex(String name,
                         String column)
                  throws DatabaseException

Description copied from interface: DatabaseManager

Drop an index. This method should throw an exception if the table does not exist, but should return false if the column has not been indexed.

Specified by:

dropIndex in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

tablename - name of the table with index

columnname - name of the column with index

Returns:

true if the index existed and has been dropped, false if it didn't exist

Throws:

DatabaseException - if a database-access error occurs

getFunction

public Function getFunction(String function_name)

Description copied from interface: DatabaseManager

Get a database specific function for use in SQL. This function may be used in any SQL query (not just queries involving this database's tables). Note that when looking up function names, ModSQL will always check for database specific functions before using built-in functions, so this method may be used to override the built-in SQL functions.

This method should return null if a function by the specified name is not found.

Specified by:

getFunction in interface DatabaseManager

Following copied from interface: ModSQL.DatabaseManager

Parameters:

name - name of function to lookup (always lowercase)

Returns:

new function object (or null if function not found)

Throws:

DatabaseException - if a database-access error occurs