org.apache.derby.impl.jdbc

Class EmbedResultSetMetaData40

java.lang.Object

org.apache.derby.impl.jdbc.EmbedResultSetMetaData

org.apache.derby.impl.jdbc.EmbedResultSetMetaData40

All Implemented Interfaces:

java.sql.ResultSetMetaData, java.sql.Wrapper

public class EmbedResultSetMetaData40
extends EmbedResultSetMetaData

ResultSetMetaData implementation for JDBC 4.

EmbedResultSetMetaData40 objects are shared across multiple threads by being stored in the ResultDescription for a compiled plan. If the required api for ResultSetMetaData ever changes so that it has a close() method, a getConnection() method or any other Connection or ResultSet specific method then this sharing must be removed.

Field Summary

Fields inherited from interface java.sql.ResultSetMetaData

columnNoNulls, columnNullable, columnNullableUnknown

Constructor Summary

Constructors

Constructor and Description
EmbedResultSetMetaData40(ResultColumnDescriptor[] columnInfo)

Method Summary

Methods

Modifier and Type	Method and Description
boolean	isWrapperFor(java.lang.Class<?> interfaces) Returns false unless interfaces is implemented
<T> T	unwrap(java.lang.Class<T> interfaces) Returns this if this class implements the interface

Methods inherited from class org.apache.derby.impl.jdbc.EmbedResultSetMetaData

getCatalogName, getColumnClassName, getColumnCount, getColumnDisplaySize, getColumnLabel, getColumnName, getColumnType, getColumnTypeName, getPrecision, getResultColumnDescriptor, getResultColumnDescriptor, getResultColumnDescriptor, getScale, getSchemaName, getTableName, isAutoIncrement, isCaseSensitive, isCurrency, isDefinitelyWritable, isNullable, isReadOnly, isSearchable, isSigned, isWritable

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EmbedResultSetMetaData40

public EmbedResultSetMetaData40(ResultColumnDescriptor[] columnInfo)

Method Detail

isWrapperFor

public boolean isWrapperFor(java.lang.Class<?> interfaces)
                     throws java.sql.SQLException

Returns false unless interfaces is implemented

Parameters:

interfaces - a Class defining an interface.

Returns:

true if this implements the interface or directly or indirectly wraps an object that does.

Throws:

java.sql.SQLException - if an error occurs while determining whether this is a wrapper for an object with the given interface.

unwrap

public <T> T unwrap(java.lang.Class<T> interfaces)
         throws java.sql.SQLException

Returns this if this class implements the interface

Parameters:

interfaces - a Class defining an interface

Returns:

an object that implements the interface

Throws:

java.sql.SQLException - if no object if found that implements the interface