Package org.hibernate.dialect

Interface ColumnAliasExtractor

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
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.

Field Summary

Fields

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

Method Summary

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

Field Details

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 Details

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