com.mckoi.database
Class DatabaseSystem

java.lang.Object
  extended by com.mckoi.database.TransactionSystem
      extended by com.mckoi.database.DatabaseSystem

public final class DatabaseSystem
extends TransactionSystem

This class provides information about shared resources available for the entire database system running in this VM. Shared information includes configuration details, DataCellCache, plug-ins, user management, etc.

Author:
Tobias Downer

Constructor Summary
DatabaseSystem()
          Constructor.
 
Method Summary
 void dispose()
          Disposes all the resources associated with this DatabaseSystem and invalidates this object.
 StatementCache getStatementCache()
          Returns the StatementCache that is used to cache StatementTree objects that are being queried by the database.
 void init(DBConfig config)
          Inits the DatabaseSystem with the configuration properties of the system.
 boolean logQueries()
          If query logging is enabled (all queries are output to 'commands.log' in the log directory), this returns true.
 Transaction.CheckExpression prepareTransactionCheckConstraint(DataTableDef table_def, Transaction.CheckExpression check)
          Given a Transaction.CheckExpression, this will prepare the expression and return a new prepared CheckExpression.
 
Methods inherited from class com.mckoi.database.TransactionSystem
addFunctionFactory, alwaysReindexDirtyTables, Debug, dontSynchFileSystem, flushCachedFunctionLookup, getBufferManager, getConfigBoolean, getConfigInt, getConfigString, getDatabasePath, getFunctionLookup, getLogDirectory, getRegexLibrary, ignoreIdentifierCase, lookupComparisonListEnabled, readOnlyAccess, setDebugLevel, setDebugOutput, setLogDirectory, setupRowCache, softIndexStorage, stats, storeSystem, tableLockingEnabled, transactionErrorOnDirtySelect
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

DatabaseSystem

public DatabaseSystem()
Constructor.

Method Detail

init

public void init(DBConfig config)
Inits the DatabaseSystem with the configuration properties of the system. This can only be called once, and should be called at database boot time.

Overrides:
init in class TransactionSystem

logQueries

public boolean logQueries()
If query logging is enabled (all queries are output to 'commands.log' in the log directory), this returns true. Otherwise it returns false.


dispose

public void dispose()
Disposes all the resources associated with this DatabaseSystem and invalidates this object.

Overrides:
dispose in class TransactionSystem

getStatementCache

public StatementCache getStatementCache()
Returns the StatementCache that is used to cache StatementTree objects that are being queried by the database. This is used to reduce the SQL command parsing overhead.

If this method returns 'null' then statement caching is disabled.


prepareTransactionCheckConstraint

public Transaction.CheckExpression prepareTransactionCheckConstraint(DataTableDef table_def,
                                                                     Transaction.CheckExpression check)
Given a Transaction.CheckExpression, this will prepare the expression and return a new prepared CheckExpression.

A DatabaseSystem resolves the variables (ignoring case if necessary) and the functions of the expression.

Overrides:
prepareTransactionCheckConstraint in class TransactionSystem