com.interface21.jdbc.core
Class DefaultColumnExtractor

java.lang.Object
  |
  +--com.interface21.jdbc.core.DefaultColumnExtractor

All Implemented Interfaces:

ColumnExtractor

public class DefaultColumnExtractor

extends java.lang.Object

implements ColumnExtractor

Default implementation of the ColumnExtractor interface. Tested in Oracle 8 and Access. As it isn't a critical part of the JDBC framework in this package, it has not been tested more rigorously.

Since:

May 2, 2001

Author:

Rod Johnson

Constructor Summary

DefaultColumnExtractor()

Method Summary

java.lang.Object	extractColumn(int i, java.lang.Class requiredType, java.sql.ResultSet rs) Extract the given column from this row of the given ResultSet, ensuring that the returned object is of the required type.
java.lang.Object	extractColumn(java.lang.String columnName, java.lang.Class requiredType, java.sql.ResultSet rs) Extract the given column from this row of the given ResultSet, ensuring that the returned object is of the required type.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultColumnExtractor

public DefaultColumnExtractor()

Method Detail

extractColumn

public java.lang.Object extractColumn(java.lang.String columnName,
                                      java.lang.Class requiredType,
                                      java.sql.ResultSet rs)
                               throws java.sql.SQLException

Extract the given column from this row of the given ResultSet, ensuring that the returned object is of the required type.
This implementation works on Oracle 8 and Access.

Specified by:

extractColumn in interface ColumnExtractor

Parameters:

columnName - name of the column we want from the ResultSet

requiredType - class of object we must return

rs - ResultSet to extract the column value from

Returns:

the value of the specified column in the ResultSet as an instance of the required type

Throws:

java.sql.SQLException - if there is any problem getting this column value

extractColumn

public java.lang.Object extractColumn(int i,
                                      java.lang.Class requiredType,
                                      java.sql.ResultSet rs)
                               throws java.sql.SQLException

Extract the given column from this row of the given ResultSet, ensuring that the returned object is of the required type. Should implement the same conversion as extractColumn(columnName...).

Specified by:

extractColumn in interface ColumnExtractor

Parameters:

i - index (from 1) of the column we want from the ResultSet

requiredType - class of object we must return

rs - ResultSet to extract the column value from

Returns:

the value of the specified column in the ResultSet as an instance of the required type

Throws:

java.sql.SQLException - if there is any problem getting this column value. Implementations of this interface do not need to worry about handling such exceptions; they can assume they will only be called by code that correctly cleans up after any SQLExceptions