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.

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
java.lang.String	extractColumnAlias(java.sql.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

java.lang.String extractColumnAlias(java.sql.ResultSetMetaData metaData,
                                    int position)
                             throws java.sql.SQLException

Extract the unique column alias.

Parameters:

metaData - The result set metadata

position - The column position

Returns:

The alias

Throws:

java.sql.SQLException - Indicates a problem accessing the JDBC ResultSetMetaData