Package com.mckoi.database
Class DatabaseSystem
- java.lang.Object
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- com.mckoi.database.TransactionSystem
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- com.mckoi.database.DatabaseSystem
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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
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Constructor Summary
Constructors Constructor Description DatabaseSystem()
Constructor.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description 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
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Method Detail
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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 classTransactionSystem
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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.
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dispose
public void dispose()
Disposes all the resources associated with this DatabaseSystem and invalidates this object.- Overrides:
dispose
in classTransactionSystem
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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.
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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 classTransactionSystem
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