程序包 org.hibernate.dialect

接口 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.

作者:

Steve Ebersole

字段概要

字段

修饰符和类型	字段	说明
static ColumnAliasExtractor	COLUMN_LABEL_EXTRACTOR	An extractor which uses ResultSetMetaData.getColumnLabel(int)
static ColumnAliasExtractor	COLUMN_NAME_EXTRACTOR	An extractor which uses ResultSetMetaData.getColumnName(int)

方法概要

修饰符和类型	方法	说明
String	extractColumnAlias(ResultSetMetaData metaData, int position)	Extract the unique column alias.

字段详细资料

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)

方法详细资料

extractColumnAlias

String extractColumnAlias(ResultSetMetaData metaData,
                          int position)
                   throws SQLException

Extract the unique column alias.

参数:

metaData - The result set metadata

position - The column position

返回:

The alias

抛出:

SQLException - Indicates a problem accessing the JDBC ResultSetMetaData