Class DatabaseConnection
- java.lang.Object
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- com.mckoi.database.DatabaseConnection
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- All Implemented Interfaces:
TriggerListener
public class DatabaseConnection extends java.lang.Object implements TriggerListener
An object that represents a connection to a Database. This object handles all transactional queries and modifications to the database.- Author:
- Tobias Downer
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Nested Class Summary
Nested Classes Modifier and Type Class Description static interface
DatabaseConnection.CallBack
Call back interface for events that occur within the connection instance.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
addCheckConstraint(TableName table_name, Expression expression, short deferred, java.lang.String constraint_name)
Same as the Transaction.addCheckConstraint method.void
addForeignKeyConstraint(TableName table, java.lang.String[] cols, TableName ref_table, java.lang.String[] ref_cols, java.lang.String delete_rule, java.lang.String update_rule, short deferred, java.lang.String constraint_name)
Same as the Transaction.addForeignKeyConstraint method.void
addPrimaryKeyConstraint(TableName table_name, java.lang.String[] cols, short deferred, java.lang.String constraint_name)
Same as the Transaction.addPrimaryKeyConstraint method.void
addSelectedFromTable(TableName name)
Adds the given table name to the list of tables that are selected from within the transaction in this connection.void
addSelectedFromTable(java.lang.String table_name)
Adds the given table name to the list of tables that are selected from within the transaction in this connection.void
addUniqueConstraint(TableName table_name, java.lang.String[] cols, short deferred, java.lang.String constraint_name)
Same as the Transaction.addUniqueConstraint method.void
alterCreateTable(DataTableDef table_def)
Given a DataTableDef, if the table exists then it is updated otherwise if it doesn't exist then it is created.void
alterCreateTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Given a DataTableDef, if the table exists then it is updated otherwise if it doesn't exist then it is created.void
checkAllConstraints(TableName table_name)
Checks all the rows in the table for immediate constraint violations and when the transaction is next committed check for all deferred constraint violations.void
close()
Closes this database connection.void
commit()
Tries to commit the current transaction.void
compactTable(TableName table_name)
Compacts the table with the given name.void
compactTable(java.lang.String table_name)
Compacts the table with the given name.Ref
createNewLargeObject(byte type, long object_size)
Allocates a new large object in the Blob store of this conglomerate of the given type and size.QueryPlanNode
createObjectFetchQueryPlan(TableName table_name, TableName aliased_name)
Creates a QueryPlanNode to fetch the given table object from this connection.void
createSchema(java.lang.String name, java.lang.String type)
Same as the Transaction.createSchema method.void
createSequenceGenerator(TableName name, long start_value, long increment_by, long min_value, long max_value, long cache, boolean cycle)
Creates a new sequence generator with the given TableName and initializes it with the given details.void
createTable(DataTableDef table_def)
Create a new table within the context of the current connection transaction.void
createTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Create a new table with a starting initial sector size.void
createTrigger(java.lang.String trigger_name, java.lang.String trigger_source, int type)
Adds a type of trigger for the given trigger source (usually the name of the table).void
createView(SQLQuery query, ViewDef view)
Creates a new view.DebugLogger
Debug()
Returns a DebugLogger object that we can use to log debug messages to.void
deleteTrigger(java.lang.String trigger_name)
Removes a type of trigger for the given trigger source (usually the name of the table).void
dropAllConstraintsForTable(TableName table_name)
Same as the Transaction.dropAllConstraintsForTable method.int
dropNamedConstraint(TableName table_name, java.lang.String constraint_name)
Same as the Transaction.dropNamedConstraint method.boolean
dropPrimaryKeyConstraintForTable(TableName table_name, java.lang.String constraint_name)
Same as the Transaction.dropPrimaryKeyConstraintForTable method.void
dropSchema(java.lang.String name)
Same as the Transaction.dropSchema method.void
dropSequenceGenerator(TableName name)
Drops an existing sequence generator with the given name.void
dropTable(TableName table_name)
Drops a table from within the context of the current connection transaction.void
dropTable(java.lang.String table_name)
Drops a table from within the context of the current connection transaction.boolean
dropView(TableName view_name)
Drops the view with the given name and returns true if the drop succeeded.void
finalize()
void
fireTrigger(DatabaseConnection database, java.lang.String trigger_name, TriggerEvent evt)
Notifies when a trigger has fired for this user.void
flushBlobStore()
Tells the conglomerate to flush the blob store.boolean
getAutoCommit()
Returns the auto-commit status of this connection.ConnectionTriggerManager
getConnectionTriggerManager()
Returns the connection trigger manager for this connection.java.lang.String
getCurrentSchema()
Returns the name of the schema that this connection is within.Database
getDatabase()
Returns the Database object for this connection.DataTableDef
getDataTableDef(TableName name)
Returns the DataTableDef for the table with the given name.GrantManager
getGrantManager()
Returns the GrantManager object that manages grants for tables in the database for this connection/user.java.sql.Connection
getJDBCConnection()
Returns a java.sql.Connection object that can be used as a JDBC interface to access the current transaction of this DatabaseConnection.LockingMechanism
getLockingMechanism()
Returns the LockingMechanism object that is within the context of this database connection.java.lang.String
getPersistentVar(java.lang.String variable)
Same as the Transaction.getPersistentVar method.ProcedureManager
getProcedureManager()
Returns the ProcedureManager object that manages database functions and procedures in the database for this connection/user.SchemaDef[]
getSchemaList()
Same as the Transaction.getSchemaList method.DatabaseSystem
getSystem()
Returns the DatabaseSystem object for this connection.DataTable
getTable(TableName name)
Returns a DataTable that represents the table from the given schema, name in the database.DataTable
getTable(java.lang.String table_name)
Returns a DataTable that represents the table with the given name in the database from the current connection schema.TableName[]
getTableList()
Returns a TableName[] array that contains the list of database tables that are visible by this transaction.TableQueryDef
getTableQueryDef(TableName table_name, TableName aliased_as)
Returns a TableQueryDef object that describes the characteristics of a table including the name (TableName), the columns (DataTableDef) and the query plan to produce the table (QueryPlanNode).java.lang.String
getTableType(TableName table_name)
Returns the type of the table object.int
getTransactionIsolation()
Returns the transaction isolation level of this connection.java.lang.String
getTransactionIsolationAsString()
Returns the transaction isolation level of this connection as a string.User
getUser()
Returns the User object for this connection.boolean
isInCaseInsensitiveMode()
Returns true if the connection is in case insensitive mode.long
lastSequenceValue(java.lang.String name)
Returns the current sequence value for the given sequence generator that was last returned by a call to 'nextSequenceValue'.long
nextSequenceValue(java.lang.String name)
Requests of the sequence generator the next value from the sequence.long
nextUniqueID(TableName name)
Returns the next unique identifier for the given table from the schema.long
nextUniqueID(java.lang.String table_name)
Returns the next unique identifier for the given table in the connection schema.void
notifyTriggerEvent(TriggerEvent evt)
Informs the underlying transaction that a high level transaction event has occurred and should be dispatched to any listeners occordingly.Transaction.CheckExpression[]
queryTableCheckExpressions(TableName table_name)
Same as the Transaction.queryTableCheckExpression method.Transaction.ColumnGroupReference[]
queryTableForeignKeyReferences(TableName table_name)
Same as the Transaction.queryTableForeignKeyReferences method.Transaction.ColumnGroupReference[]
queryTableImportedForeignKeyReferences(TableName table_name)
Same as the Transaction.queryTableImportedForeignKeyReferences method.Transaction.ColumnGroup
queryTablePrimaryKeyGroup(TableName table_name)
Same as the Transaction.queryTablePrimaryKeyGroup method.TableName[]
queryTablesRelationallyLinkedTo(TableName table)
Same as the Transaction.queryTablesRelationallyLinkedTo method.Transaction.ColumnGroup[]
queryTableUniqueGroups(TableName table_name)
Same as the Transaction.queryTableUniqueGroups method.SchemaDef
resolveSchemaCase(java.lang.String name, boolean ignore_case)
Same as the Transaction.resolveSchemaCase method.SchemaDef
resolveSchemaName(java.lang.String name)
Convenience - returns the SchemaDef object given the name of the schema.TableName
resolveTableName(java.lang.String name)
Resolves a TableName string (eg.TableName
resolveToTableName(java.lang.String name)
Resolves the given string to a table name, throwing an exception if the reference is ambiguous.void
rollback()
Rolls back the current transaction operating within this connection.boolean
schemaExists(java.lang.String name)
Same as the Transaction.schemaExists method.void
setAutoCommit(boolean status)
Sets the auto-commit mode.void
setCurrentSchema(java.lang.String current_schema)
Sets the schema that this connection is within.void
setDefaultSchema(java.lang.String schema_name)
Changes the default schema to the given schema.void
setPersistentVar(java.lang.String variable, java.lang.String value)
Same as the Transaction.setPersistentVar method.void
setSequenceValue(java.lang.String name, long value)
Sets the sequence value for the given sequence generator.void
setTransactionIsolation(java.lang.String name)
Sets the transaction isolation level from a string.void
setVar(java.lang.String name, Expression exp)
Assigns a variable to the expression for this connection.boolean
tableExists(TableName table_name)
Returns true if the table exists within this connection transaction.boolean
tableExists(java.lang.String table_name)
Returns true if the table exists within this connection transaction.TableName
tryResolveCase(TableName table_name)
Attempts to resolve the given table name to its correct case assuming the table name represents a case insensitive version of the name.void
updateTable(DataTableDef table_def)
Updates a given table within the context of the current connection transaction.void
updateTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Updates a given table within the context of the current connection transaction.
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Method Detail
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getJDBCConnection
public java.sql.Connection getJDBCConnection()
Returns a java.sql.Connection object that can be used as a JDBC interface to access the current transaction of this DatabaseConnection.There are a few important considerations when using the JDBC connection;
- The returned Connection does not allow auto-commit to be set. It is intended to be used to issue commands to this DatabaseConnection from inside a transaction so auto-commit does not make sense.
- The returned object must only be accessed from the same worker thread that is currently accessing this DatabaseConnection. The returned Connection is NOT multi-thread capable.
- The java.sql.Connection returned here is invalidated (disposed) when the current transaction is closed (committed or rolled back).
- This method returns the same java.sql.Connection on multiple calls to this method (while a transaction is open).
- The DatabaseConnection must be locked in EXCLUSIVE mode or the queries will fail.
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getSystem
public DatabaseSystem getSystem()
Returns the DatabaseSystem object for this connection.
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getDatabase
public Database getDatabase()
Returns the Database object for this connection.
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getUser
public User getUser()
Returns the User object for this connection.
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Debug
public final DebugLogger Debug()
Returns a DebugLogger object that we can use to log debug messages to.
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getConnectionTriggerManager
public ConnectionTriggerManager getConnectionTriggerManager()
Returns the connection trigger manager for this connection.
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getGrantManager
public GrantManager getGrantManager()
Returns the GrantManager object that manages grants for tables in the database for this connection/user.
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getProcedureManager
public ProcedureManager getProcedureManager()
Returns the ProcedureManager object that manages database functions and procedures in the database for this connection/user.
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setAutoCommit
public void setAutoCommit(boolean status)
Sets the auto-commit mode.
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setTransactionIsolation
public void setTransactionIsolation(java.lang.String name)
Sets the transaction isolation level from a string.
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setVar
public void setVar(java.lang.String name, Expression exp)
Assigns a variable to the expression for this connection. This is a generic way of setting properties of the connection. Currently supported variables are;ERROR_ON_DIRTY_SELECT - set to Boolean.TRUE for turning this transaction conflict off on this connection. CASE_INSENSITIVE_IDENTIFIERS - Boolean.TRUE means the grammar becomes case insensitive for identifiers resolved by the grammar.
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getAutoCommit
public boolean getAutoCommit()
Returns the auto-commit status of this connection. If this is true then the language layer must execute a COMMIT after every statement.
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getTransactionIsolation
public int getTransactionIsolation()
Returns the transaction isolation level of this connection.
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getTransactionIsolationAsString
public java.lang.String getTransactionIsolationAsString()
Returns the transaction isolation level of this connection as a string.
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getCurrentSchema
public java.lang.String getCurrentSchema()
Returns the name of the schema that this connection is within.
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isInCaseInsensitiveMode
public boolean isInCaseInsensitiveMode()
Returns true if the connection is in case insensitive mode. In case insensitive mode the case of identifier strings is not important.
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setCurrentSchema
public void setCurrentSchema(java.lang.String current_schema)
Sets the schema that this connection is within.
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getLockingMechanism
public LockingMechanism getLockingMechanism()
Returns the LockingMechanism object that is within the context of this database connection. This manages read/write locking within this connection.
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getTableList
public TableName[] getTableList()
Returns a TableName[] array that contains the list of database tables that are visible by this transaction.This returns the list of all objects that represent queriable tables in the database.
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tableExists
public boolean tableExists(java.lang.String table_name)
Returns true if the table exists within this connection transaction.
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tableExists
public boolean tableExists(TableName table_name)
Returns true if the table exists within this connection transaction.
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getTableType
public java.lang.String getTableType(TableName table_name)
Returns the type of the table object. Currently this is either "TABLE" or "VIEW".
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tryResolveCase
public TableName tryResolveCase(TableName table_name)
Attempts to resolve the given table name to its correct case assuming the table name represents a case insensitive version of the name. For example, "aPP.CuSTOMer" may resolve to "APP.Customer". If the table name can not resolve to a valid identifier it returns the input table name, therefore the actual presence of the table should always be checked by calling 'tableExists' after this method returns.
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resolveTableName
public TableName resolveTableName(java.lang.String name)
Resolves a TableName string (eg. 'Customer' 'APP.Customer' ) to a TableName object. If the schema part of the table name is not present then it is set to the current schema of the database connection. If the database is ignoring the case then this will correctly resolve the table to the cased version of the table name.
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resolveToTableName
public TableName resolveToTableName(java.lang.String name)
Resolves the given string to a table name, throwing an exception if the reference is ambiguous. This also generates an exception if the table object is not found.
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getDataTableDef
public DataTableDef getDataTableDef(TableName name)
Returns the DataTableDef for the table with the given name.
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getTable
public DataTable getTable(TableName name)
Returns a DataTable that represents the table from the given schema, name in the database.
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getTable
public DataTable getTable(java.lang.String table_name)
Returns a DataTable that represents the table with the given name in the database from the current connection schema.
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createTable
public void createTable(DataTableDef table_def)
Create a new table within the context of the current connection transaction.
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createTable
public void createTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Create a new table with a starting initial sector size. This should only be used as very fine grain optimization for creating tables. If in the future the underlying table model is changed so that the given 'sector_size' value is unapplicable, then the value will be ignored.
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createView
public void createView(SQLQuery query, ViewDef view)
Creates a new view. This takes the information in the ViewDef object and adds it to the system view table.Note that this is a transactional operation. You need to commit for the view to be visible to other transactions.
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dropView
public boolean dropView(TableName view_name)
Drops the view with the given name and returns true if the drop succeeded. Returns false if the view was not found.Note that this is a transactional operation. You need to commit for the change to be visible to other transactions.
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updateTable
public void updateTable(DataTableDef table_def)
Updates a given table within the context of the current connection transaction.
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updateTable
public void updateTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Updates a given table within the context of the current connection transaction. This should only be used as very fine grain optimization for creating tables.If in the future the underlying table model is changed so that the given 'sector_size' value is unapplicable, then the value will be ignored.
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alterCreateTable
public void alterCreateTable(DataTableDef table_def, int data_sector_size, int index_sector_size)
Given a DataTableDef, if the table exists then it is updated otherwise if it doesn't exist then it is created.This should only be used as very fine grain optimization for creating/ altering tables. If in the future the underlying table model is changed so that the given 'sector_size' value is unapplicable, then the value will be ignored.
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alterCreateTable
public void alterCreateTable(DataTableDef table_def)
Given a DataTableDef, if the table exists then it is updated otherwise if it doesn't exist then it is created.
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checkAllConstraints
public void checkAllConstraints(TableName table_name)
Checks all the rows in the table for immediate constraint violations and when the transaction is next committed check for all deferred constraint violations. This method is used when the constraints on a table changes and we need to determine if any constraint violations occurred. To the constraint checking system, this is like adding all the rows to the given table.
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dropTable
public void dropTable(java.lang.String table_name)
Drops a table from within the context of the current connection transaction.
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dropTable
public void dropTable(TableName table_name)
Drops a table from within the context of the current connection transaction.
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compactTable
public void compactTable(java.lang.String table_name)
Compacts the table with the given name. Throws an exception if the table doesn't exist.
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compactTable
public void compactTable(TableName table_name)
Compacts the table with the given name. Throws an exception if the table doesn't exist.
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addSelectedFromTable
public void addSelectedFromTable(java.lang.String table_name)
Adds the given table name to the list of tables that are selected from within the transaction in this connection.
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addSelectedFromTable
public void addSelectedFromTable(TableName name)
Adds the given table name to the list of tables that are selected from within the transaction in this connection.
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nextSequenceValue
public long nextSequenceValue(java.lang.String name)
Requests of the sequence generator the next value from the sequence.NOTE: This does NOT check that the user owning this connection has the correct privs to perform this operation.
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lastSequenceValue
public long lastSequenceValue(java.lang.String name)
Returns the current sequence value for the given sequence generator that was last returned by a call to 'nextSequenceValue'. If a value was not last returned by a call to 'nextSequenceValue' then a statement exception is generated.NOTE: This does NOT check that the user owning this connection has the correct privs to perform this operation.
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setSequenceValue
public void setSequenceValue(java.lang.String name, long value)
Sets the sequence value for the given sequence generator. If the generator does not exist or it is not possible to set the value for the generator then an exception is generated.NOTE: This does NOT check that the user owning this connection has the correct privs to perform this operation.
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nextUniqueID
public long nextUniqueID(TableName name)
Returns the next unique identifier for the given table from the schema.
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nextUniqueID
public long nextUniqueID(java.lang.String table_name)
Returns the next unique identifier for the given table in the connection schema.
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createSequenceGenerator
public void createSequenceGenerator(TableName name, long start_value, long increment_by, long min_value, long max_value, long cache, boolean cycle)
Creates a new sequence generator with the given TableName and initializes it with the given details. This does NOT check if the given name clashes with an existing database object.
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dropSequenceGenerator
public void dropSequenceGenerator(TableName name)
Drops an existing sequence generator with the given name.
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createTrigger
public void createTrigger(java.lang.String trigger_name, java.lang.String trigger_source, int type)
Adds a type of trigger for the given trigger source (usually the name of the table).Adds a type of trigger to the given Table. When the event is fired, the UserCallBack method is notified of the event.
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deleteTrigger
public void deleteTrigger(java.lang.String trigger_name)
Removes a type of trigger for the given trigger source (usually the name of the table).
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notifyTriggerEvent
public void notifyTriggerEvent(TriggerEvent evt)
Informs the underlying transaction that a high level transaction event has occurred and should be dispatched to any listeners occordingly.
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createNewLargeObject
public Ref createNewLargeObject(byte type, long object_size)
Allocates a new large object in the Blob store of this conglomerate of the given type and size. The blob data must be written through the Ref after the large object is created. Once the data has been written the 'complete' method in Ref is called.Once a large object is created and written to, it may be allocated in one or more tables in the conglomerate.
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flushBlobStore
public void flushBlobStore()
Tells the conglomerate to flush the blob store. This should be called after one or more blobs have been created and the data for the blob(s) are set. It is an important step to perform AFTER blobs have been written.If this is not called and the database closes (or crashes) before a flush occurs then the blob may not be recoverable.
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getTableQueryDef
public TableQueryDef getTableQueryDef(TableName table_name, TableName aliased_as)
Returns a TableQueryDef object that describes the characteristics of a table including the name (TableName), the columns (DataTableDef) and the query plan to produce the table (QueryPlanNode). This object can be used to resolve information about a particular table, and to evaluate the query plan to produce the table itself.This produces TableQueryDef objects for all table objects in the database including data tables and views.
The 'aliased_as' parameter is used to overwrite the default name of the table object.
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createObjectFetchQueryPlan
public QueryPlanNode createObjectFetchQueryPlan(TableName table_name, TableName aliased_name)
Creates a QueryPlanNode to fetch the given table object from this connection.
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setDefaultSchema
public void setDefaultSchema(java.lang.String schema_name)
Changes the default schema to the given schema.
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createSchema
public void createSchema(java.lang.String name, java.lang.String type)
Same as the Transaction.createSchema method.
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dropSchema
public void dropSchema(java.lang.String name)
Same as the Transaction.dropSchema method.
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schemaExists
public boolean schemaExists(java.lang.String name)
Same as the Transaction.schemaExists method.
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resolveSchemaCase
public SchemaDef resolveSchemaCase(java.lang.String name, boolean ignore_case)
Same as the Transaction.resolveSchemaCase method.
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resolveSchemaName
public SchemaDef resolveSchemaName(java.lang.String name)
Convenience - returns the SchemaDef object given the name of the schema. If identifiers are case insensitive, we resolve the case of the schema name also.
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getSchemaList
public SchemaDef[] getSchemaList()
Same as the Transaction.getSchemaList method.
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setPersistentVar
public void setPersistentVar(java.lang.String variable, java.lang.String value)
Same as the Transaction.setPersistentVar method.
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getPersistentVar
public java.lang.String getPersistentVar(java.lang.String variable)
Same as the Transaction.getPersistentVar method.
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addUniqueConstraint
public void addUniqueConstraint(TableName table_name, java.lang.String[] cols, short deferred, java.lang.String constraint_name)
Same as the Transaction.addUniqueConstraint method.
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addForeignKeyConstraint
public void addForeignKeyConstraint(TableName table, java.lang.String[] cols, TableName ref_table, java.lang.String[] ref_cols, java.lang.String delete_rule, java.lang.String update_rule, short deferred, java.lang.String constraint_name)
Same as the Transaction.addForeignKeyConstraint method.
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addPrimaryKeyConstraint
public void addPrimaryKeyConstraint(TableName table_name, java.lang.String[] cols, short deferred, java.lang.String constraint_name)
Same as the Transaction.addPrimaryKeyConstraint method.
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addCheckConstraint
public void addCheckConstraint(TableName table_name, Expression expression, short deferred, java.lang.String constraint_name)
Same as the Transaction.addCheckConstraint method.
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dropAllConstraintsForTable
public void dropAllConstraintsForTable(TableName table_name)
Same as the Transaction.dropAllConstraintsForTable method.
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dropNamedConstraint
public int dropNamedConstraint(TableName table_name, java.lang.String constraint_name)
Same as the Transaction.dropNamedConstraint method.
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dropPrimaryKeyConstraintForTable
public boolean dropPrimaryKeyConstraintForTable(TableName table_name, java.lang.String constraint_name)
Same as the Transaction.dropPrimaryKeyConstraintForTable method.
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queryTablesRelationallyLinkedTo
public TableName[] queryTablesRelationallyLinkedTo(TableName table)
Same as the Transaction.queryTablesRelationallyLinkedTo method.
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queryTableUniqueGroups
public Transaction.ColumnGroup[] queryTableUniqueGroups(TableName table_name)
Same as the Transaction.queryTableUniqueGroups method.
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queryTablePrimaryKeyGroup
public Transaction.ColumnGroup queryTablePrimaryKeyGroup(TableName table_name)
Same as the Transaction.queryTablePrimaryKeyGroup method.
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queryTableCheckExpressions
public Transaction.CheckExpression[] queryTableCheckExpressions(TableName table_name)
Same as the Transaction.queryTableCheckExpression method.
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queryTableForeignKeyReferences
public Transaction.ColumnGroupReference[] queryTableForeignKeyReferences(TableName table_name)
Same as the Transaction.queryTableForeignKeyReferences method.
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queryTableImportedForeignKeyReferences
public Transaction.ColumnGroupReference[] queryTableImportedForeignKeyReferences(TableName table_name)
Same as the Transaction.queryTableImportedForeignKeyReferences method.
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fireTrigger
public void fireTrigger(DatabaseConnection database, java.lang.String trigger_name, TriggerEvent evt)
Notifies when a trigger has fired for this user. If there are no open transactions on this connection then we do a straight call back trigger notify. If there is a transaction open then trigger events are added to the 'trigger_event_buffer' which fires when the connection transaction is committed or rolled back.- Specified by:
fireTrigger
in interfaceTriggerListener
- Parameters:
database
- the DatabaseConnection that this trigger is registered for.evt
- the trigger event that was fired.
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commit
public void commit() throws TransactionException
Tries to commit the current transaction. If the transaction can not be committed because there were concurrent changes that interfered with each other then a TransactionError is thrown and the transaction is rolled back.NOTE: It's guarenteed that the transaction will be closed even if a transaction exception occurs.
Synchronization is implied on this method, because the locking mechanism should be exclusive when this is called.
- Throws:
TransactionException
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rollback
public void rollback()
Rolls back the current transaction operating within this connection.NOTE: It's guarenteed that the transaction will be closed even if an exception occurs.
Synchronization is implied on this method, because the locking mechanism should be exclusive when this is called.
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close
public void close()
Closes this database connection.
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finalize
public void finalize() throws java.lang.Throwable
- Overrides:
finalize
in classjava.lang.Object
- Throws:
java.lang.Throwable
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