org.hibernate.dialect

Interface ColumnAliasExtractor

public interface ColumnAliasExtractor

Strategy for extracting the unique column alias out of a ResultSetMetaData. This is used during the "auto discovery" phase of native SQL queries.

Generally this should be done via ResultSetMetaData.getColumnLabel(int), but not all drivers do this correctly.

Author:

Steve Ebersole

Field Summary

Fields

Modifier and Type	Field and Description
static ColumnAliasExtractor	COLUMN_LABEL_EXTRACTOR An extractor which uses ResultSetMetaData.getColumnLabel(int)
static ColumnAliasExtractor	COLUMN_NAME_EXTRACTOR An extractor which uses ResultSetMetaData.getColumnName(int)

Method Summary

Modifier and Type	Method and Description
String	extractColumnAlias(ResultSetMetaData metaData, int position) Extract the unique column alias.

Field Detail

COLUMN_LABEL_EXTRACTOR

static final ColumnAliasExtractor COLUMN_LABEL_EXTRACTOR

An extractor which uses ResultSetMetaData.getColumnLabel(int)

COLUMN_NAME_EXTRACTOR

static final ColumnAliasExtractor COLUMN_NAME_EXTRACTOR

An extractor which uses ResultSetMetaData.getColumnName(int)

Method Detail

extractColumnAlias

String extractColumnAlias(ResultSetMetaData metaData,
                          int position)
                   throws SQLException

Extract the unique column alias.

Parameters:

metaData - The result set metadata

position - The column position

Returns:

The alias

Throws:

SQLException - Indicates a problem accessing the JDBC ResultSetMetaData