org.eigenbase.oj.stmt
Class PreparedExplanation

java.lang.Object
  org.eigenbase.oj.stmt.PreparedExplanation

All Implemented Interfaces:

PreparedResult

public class PreparedExplanation
extends Object
implements PreparedResult

PreparedExplanation is a PreparedResult for an EXPLAIN PLAN statement. It's always good to have an explanation prepared.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/oj/stmt/PreparedExplanation.java#16 $

Author:

John V. Sichi

Field Summary

private boolean	asXml
private SqlExplainLevel	detailLevel
private RelNode	rel
private RelDataType	rowType

Constructor Summary

PreparedExplanation(RelDataType rowType, RelNode rel, boolean asXml, SqlExplainLevel detailLevel)

Method Summary

Object	execute() Executes the prepared result.
static ResultSet	executeStatic(String explanation)
String	getCode()
RelNode	getRel()
TableModificationRelBase.Operation	getTableModOp()
boolean	isDml()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

rowType

private final RelDataType rowType

rel

private final RelNode rel

asXml

private final boolean asXml

detailLevel

private final SqlExplainLevel detailLevel

Constructor Detail

PreparedExplanation

public PreparedExplanation(RelDataType rowType,
                           RelNode rel,
                           boolean asXml,
                           SqlExplainLevel detailLevel)

Method Detail

getCode

public String getCode()

Specified by:

getCode in interface PreparedResult

Returns:

the code generated by preparation

isDml

public boolean isDml()

Specified by:

isDml in interface PreparedResult

Returns:

true iff this result is for a DML statement, in which case the result set is one row with one column containing the number of rows affected.

getTableModOp

public TableModificationRelBase.Operation getTableModOp()

Specified by:

getTableModOp in interface PreparedResult

Returns:

the table modification operation corresponding to this statement if it is a table modification statement; otherwise null

getRel

public RelNode getRel()

execute

public Object execute()

Description copied from interface: PreparedResult

Executes the prepared result.

Specified by:

execute in interface PreparedResult

Returns:

producer of rows resulting from execution

executeStatic

public static ResultSet executeStatic(String explanation)