net.sf.saffron.rel
Class TableModificationRel

java.lang.Object
  |
  +--net.sf.saffron.rel.SaffronRel
        |
        +--net.sf.saffron.rel.SingleRel
              |
              +--net.sf.saffron.rel.TableModificationRel

public class TableModificationRel

extends SingleRel

TableModificationRel is like TableAccessRel, but represents a request to modify a table rather than read from it. It takes one child which produces the modified rows. (For INSERT, the new values; for DELETE, the old values; for the yet-to-be-implemented UPDATE, the old and new values.)

Version:

$Id: //open/saffron/src/net/sf/saffron/rel/TableModificationRel.java#5 $

Nested Class Summary

static class

TableModificationRel.Operation Enumeration of supported modification operations.

Field Summary

protected SaffronConnection	connection The connection to Saffron.
private TableModificationRel.Operation	operation
protected SaffronTable	table The table definition.

Fields inherited from class net.sf.saffron.rel.SingleRel

child

Fields inherited from class net.sf.saffron.rel.SaffronRel

cluster, digest, emptyArray, id, nextId, rowType

Constructor Summary

TableModificationRel(VolcanoCluster cluster, SaffronTable table, SaffronConnection connection, SaffronRel child, TableModificationRel.Operation operation)

Method Summary

Object	clone()
SaffronType	deriveRowType()
void	explain(PlanWriter pw)
SaffronConnection	getConnection()
TableModificationRel.Operation	getOperation()
SaffronTable	getTable() If this relational expression represents an access to a table, returns that table, otherwise returns null.

Methods inherited from class net.sf.saffron.rel.SingleRel

childrenAccept, getInputs, getRows, replaceInput

Methods inherited from class net.sf.saffron.rel.SaffronRel

computeDigest, computeSelfCost, getChildExps, getCluster, getConvention, getCorrelVariable, getId, getInput, getOrCreateCorrelVariable, getQualifier, getQuery, getRelTypeName, getRowType, getVariablesStopped, implement, implementFieldAccess, isAccessTo, isDistinct, onRegister, recomputeDigest, register, registerCorrelVariable, setCorrelVariable, toString

Methods inherited from class java.lang.Object

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

Field Detail

connection

protected SaffronConnection connection

The connection to Saffron.

table

protected SaffronTable table

The table definition.

operation

private TableModificationRel.Operation operation

Constructor Detail

TableModificationRel

public TableModificationRel(VolcanoCluster cluster,
                            SaffronTable table,
                            SaffronConnection connection,
                            SaffronRel child,
                            TableModificationRel.Operation operation)

Method Detail

getConnection

public SaffronConnection getConnection()

getTable

public SaffronTable getTable()

Description copied from class: SaffronRel

If this relational expression represents an access to a table, returns that table, otherwise returns null.

Overrides:

getTable in class SaffronRel

clone

public Object clone()

Specified by:

clone in class SaffronRel

getOperation

public TableModificationRel.Operation getOperation()

deriveRowType

public SaffronType deriveRowType()

Overrides:

deriveRowType in class SingleRel

explain

public void explain(PlanWriter pw)

Overrides:

explain in class SingleRel