net.sf.saffron.ext
Class JdbcTable

java.lang.Object
  |
  +--net.sf.saffron.ext.AbstractTable
        |
        +--net.sf.saffron.ext.JdbcTable

All Implemented Interfaces:

ImplementableTable, SaffronTable

public class JdbcTable

extends AbstractTable

implements ImplementableTable

A JdbcTable implements SaffronTable by connecting to a JDBC database.

Since:

10 November, 2001

Version:

$Id: //open/saffron/src/net/sf/saffron/ext/JdbcTable.java#3 $

Author:

jhyde

Nested Class Summary

static class

JdbcTable.JdbcColumn JdbcColumn records the mapping of fields onto columns, for the purposes of SQL generation.

Field Summary

(package private) JdbcTable.JdbcColumn[]

columns

Fields inherited from class net.sf.saffron.ext.AbstractTable

name, rowType, schema

Constructor Summary

JdbcTable(SaffronSchema schema, String name, SaffronType rowType)

JdbcTable(SaffronSchema schema, String name, SaffronType rowType, JdbcTable.JdbcColumn[] columns)

Method Summary

JdbcTable.JdbcColumn	getColumn(String fieldName) Returns the column that the named field maps to.
void	implement(SaffronRel rel, RelImplementor implementor)
SaffronRel	toRel(VolcanoCluster cluster, SaffronConnection connection) Converts this table into a relational expression.

Methods inherited from class net.sf.saffron.ext.AbstractTable

getName, getQualifiedName, getRowCount, getRowType, getSaffronSchema

Methods inherited from class java.lang.Object

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

Methods inherited from interface net.sf.saffron.core.SaffronTable

getQualifiedName, getRowCount, getRowType, getSaffronSchema

Field Detail

columns

JdbcTable.JdbcColumn[] columns

Constructor Detail

JdbcTable

public JdbcTable(SaffronSchema schema,
                 String name,
                 SaffronType rowType,
                 JdbcTable.JdbcColumn[] columns)

JdbcTable

public JdbcTable(SaffronSchema schema,
                 String name,
                 SaffronType rowType)

Method Detail

getColumn

public JdbcTable.JdbcColumn getColumn(String fieldName)

Returns the column that the named field maps to.

implement

public void implement(SaffronRel rel,
                      RelImplementor implementor)

Specified by:

implement in interface ImplementableTable

toRel

public SaffronRel toRel(VolcanoCluster cluster,
                        SaffronConnection connection)

Description copied from interface: SaffronTable

Converts this table into a relational expression.

The planner calls this method to convert a table into an initial relational expression, generally something abstract, such as a TableAccessRel, then optimizes this expression by applying rules to transform it into more efficient access methods for this table.

Specified by:

toRel in interface SaffronTable

Parameters:

cluster - the cluster the relational expression will belong to

connection - the parse tree of the expression which evaluates to a connection object