saffron.ext
Class JdbcTable

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

All Implemented Interfaces:

ImplementableTable, Table

public class JdbcTable

extends AbstractTable

implements ImplementableTable

A JdbcTable implements Table by connecting to a JDBC database.

Since:

10 November, 2001

Version:

$Id: //open/saffron/src/main/saffron/ext/JdbcTable.java#5 $

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 saffron.ext.AbstractTable

name, rowType, schema

Constructor Summary

JdbcTable(Schema schema, String name, Type rowType)

JdbcTable(Schema schema, String name, Type rowType, JdbcTable.JdbcColumn[] columns)

Method Summary

JdbcTable.JdbcColumn	getColumn(String fieldName) Returns the column that the named field maps to.
void	implement(Rel rel, Implementor implementor)
Rel	toRel(Cluster cluster, Expression connectionExp) Converts this table into a relational expression.

Methods inherited from class saffron.ext.AbstractTable

getName, getQualifiedName, getRowCount, getRowType, getSchema

Methods inherited from class java.lang.Object

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

Methods inherited from interface saffron.Table

getQualifiedName, getRowCount, getRowType, getSchema

Field Detail

columns

JdbcTable.JdbcColumn[] columns

Constructor Detail

JdbcTable

public JdbcTable(Schema schema,
                 String name,
                 Type rowType,
                 JdbcTable.JdbcColumn[] columns)

JdbcTable

public JdbcTable(Schema schema,
                 String name,
                 Type rowType)

Method Detail

toRel

public Rel toRel(Cluster cluster,
                 Expression connectionExp)

Description copied from interface: Table

Converts this table into a relational expression. This relational expression can then be optimized by applying rules to transform it into other access methods for this table.

Specified by:

toRel in interface Table

Parameters:

cluster - the cluster this Rel will belong to

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

getColumn

public JdbcTable.JdbcColumn getColumn(String fieldName)

Returns the column that the named field maps to.

implement

public void implement(Rel rel,
                      Implementor implementor)

Specified by:

implement in interface ImplementableTable