ColumnAliasExtractor (Hibernate Javadocs)

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 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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	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