Class ConstantActionActivation
- java.lang.Object
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- org.apache.derby.impl.sql.execute.BaseActivation
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- org.apache.derby.impl.sql.execute.ConstantActionActivation
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- All Implemented Interfaces:
Dependable
,GeneratedByteCode
,Activation
,Dependent
,CursorActivation
public final class ConstantActionActivation extends BaseActivation
A pre-compiled activation that supports a single ResultSet with a single constant action. All the execution logic is contained in the constant action.At compile time for DDL statements this class will be picked as the implementation of Activation. The language PreparedStatement will contain the ConstantAction created at compiled time. At execute time this class then fetches a language ResultSet using ResultSetFactory.getDDLResultSet and executing the ResultSet will invoke the execute on the ConstantAction.
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Field Summary
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Fields inherited from class org.apache.derby.impl.sql.execute.BaseActivation
closed, cm, indexOfSessionTableNamesInSavedObjects, numSubqueries, parentResultSets, preStmt, pvs, raParentResultSets, resultDescription, resultSet, row, UUIDString, UUIDValue
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Fields inherited from interface org.apache.derby.catalog.Dependable
ACTIVATION, ALIAS, COLUMNS_IN_TABLE, COLUMNS_PERMISSION, CONGLOMERATE, CONSTRAINT, DEFAULT, FILE, HEAP, INDEX, PERM, PREPARED_STATEMENT, ROLE_GRANT, ROUTINE_PERMISSION, SCHEMA, SEQUENCE, STORED_PREPARED_STATEMENT, TABLE, TABLE_PERMISSION, TRIGGER, VIEW
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Constructor Summary
Constructors Constructor Description ConstantActionActivation()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description protected ResultSet
createResultSet()
Create the ResultSet tree for this statement.void
postConstructor()
Called by the class manager just after calling setGC().protected boolean
shouldWeCheckRowCounts()
Always return false since constant actions don't need recompilation when the row counts change.-
Methods inherited from class org.apache.derby.impl.sql.execute.BaseActivation
addWarning, allocateQualArray, checkIfThisActivationHasHoldCursor, checkPositionedStatement, checkStatementValidity, clearCurrentRow, clearHeapConglomerateController, clearIndexScanInfo, clearParentResultSets, clearWarnings, close, closeActivationAction, decorateResultSet, e0, e1, e2, e3, e4, e5, e6, e7, e8, e9, execute, getAutoGeneratedKeysColumnIndexes, getAutoGeneratedKeysColumnNames, getAutoGeneratedKeysResultsetMode, getCalendar, getClassType, getColumnFromRow, getConstantAction, getContextManager, getCurrentConnection, getCurrentRow, getCurrentValueAndAdvance, getCursorName, getCursorResultSet, getDataValueFactory, getDB2Length, getDDLTableDescriptor, getDependableFinder, getDynamicResults, getExecutionFactory, getForCreateTable, getForUpdateIndexScan, getGC, getHeapConglomerateController, getIndexConglomerateNumber, getIndexScanController, getLanguageConnectionContext, getMaxDynamicResults, getMaxRows, getMethod, getMonitor, getNumSubqueries, getObjectID, getObjectName, getParameter, getParameterValueSet, getParentActivation, getParentResultSet, getParentResultSetKeys, getPreparedStatement, getResultDescription, getResultSet, getResultSetFactory, getResultSetHoldability, getRowLocationTemplate, getScrollable, getSetAutoincrementValue, getSQLSessionContextForChildren, getTargetResultSet, getTargetVTI, getTransactionController, getWarnings, informOfRowCount, initFromContext, isClosed, isCursorActivation, isInUse, isPersistent, isSingleExecution, isValid, makeInvalid, markUnused, materializeResultSetIfPossible, nullToPrimitiveTest, popConstantAction, prepareToInvalidate, pushConstantAction, reinit, reinitializeQualifiers, reset, setAutoGeneratedKeysResultsetInfo, setColumnPosition, setCurrentRow, setCursorName, setDDLTableDescriptor, setForCreateTable, setForUpdateIndexScan, setGC, setHeapConglomerateController, setIndexConglomerateNumber, setIndexScanController, setMaxRows, setParameters, setParameterValueSet, setParentActivation, setParentResultSet, setQualifier, setResultSetHoldability, setSingleExecution, setTargetVTI, setupActivation, setupSQLSessionContextForChildren, throwIfClosed, throwIfMissingParms
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Method Detail
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shouldWeCheckRowCounts
protected boolean shouldWeCheckRowCounts()
Always return false since constant actions don't need recompilation when the row counts change.- Overrides:
shouldWeCheckRowCounts
in classBaseActivation
- Returns:
- true if the row counts should be checked, false otherwise
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createResultSet
protected ResultSet createResultSet() throws StandardException
Description copied from class:BaseActivation
Create the ResultSet tree for this statement.- Specified by:
createResultSet
in classBaseActivation
- Returns:
- the root of the ResultSet tree for this statement
- Throws:
StandardException
- standard error policy
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postConstructor
public void postConstructor()
Description copied from interface:GeneratedByteCode
Called by the class manager just after calling setGC().
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