org.apache.derby.vti
Interface VTIEnvironment

public interface VTIEnvironment

VTIEnvironment is the state variable created by the optimizer to help it place a Table Function in the join order. The methods of VTICosting use this state variable in order to pass information to each other and learn other details of the operating environment.

See Also:

VTICosting

Method Summary

java.lang.String	getOriginalSQL() Return the SQL text of the original SQL statement.
java.lang.Object	getSharedState(java.lang.String key) Get an object associated with a key from set of objects maintained with the statement plan.
int	getStatementIsolationLevel() Get the specific JDBC isolation of the statement.
boolean	isCompileTime() Return true if this instance of the Table Function has been created for compilation, false if it is for runtime execution.
void	setSharedState(java.lang.String key, java.io.Serializable value) Saves an object associated with a key that will be maintained for the lifetime of the statement plan.

Method Detail

isCompileTime

boolean isCompileTime()

Return true if this instance of the Table Function has been created for compilation, false if it is for runtime execution.

getOriginalSQL

java.lang.String getOriginalSQL()

Return the SQL text of the original SQL statement.

getStatementIsolationLevel

int getStatementIsolationLevel()

Get the specific JDBC isolation of the statement. If it returns Connection.TRANSACTION_NONE then no isolation was specified and the connection's isolation level is implied.

setSharedState

void setSharedState(java.lang.String key,
                    java.io.Serializable value)

Saves an object associated with a key that will be maintained for the lifetime of the statement plan. Any previous value associated with the key is discarded. Any saved object can be seen by any JDBC Connection that has a Statement object that references the same statement plan.

getSharedState

java.lang.Object getSharedState(java.lang.String key)

Get an object associated with a key from set of objects maintained with the statement plan.