Package org.firebirdsql.jdbc

Class FBResultSetMetaData

java.lang.Object

org.firebirdsql.jdbc.AbstractFieldMetaData

org.firebirdsql.jdbc.FBResultSetMetaData

All Implemented Interfaces:

ResultSetMetaData, Wrapper, FirebirdResultSetMetaData

public class FBResultSetMetaData
extends AbstractFieldMetaData
implements FirebirdResultSetMetaData

An object that can be used to get information about the types and properties of the columns in a ResultSet object.

Author:

David Jencks, Mark Rotteveel

Nested Class Summary

Nested classes/interfaces inherited from class org.firebirdsql.jdbc.AbstractFieldMetaData

AbstractFieldMetaData.ExtendedFieldInfo, AbstractFieldMetaData.FieldKey

Field Summary

Fields inherited from interface java.sql.ResultSetMetaData

columnNoNulls, columnNullable, columnNullableUnknown

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FBResultSetMetaData(RowDescriptor rowDescriptor, FBConnection connection)	Creates a new FBResultSetMetaData instance.

Method Summary

Modifier and Type	Method	Description
String	getCatalogName(int column)
String	getColumnClassName(int column)
int	getColumnCount()
int	getColumnDisplaySize(int column)
String	getColumnLabel(int column)
String	getColumnName(int column)
int	getColumnType(int column)
String	getColumnTypeName(int column)
protected Map<AbstractFieldMetaData.FieldKey,AbstractFieldMetaData.ExtendedFieldInfo>	getExtendedFieldInfo(FBConnection connection)	This method retrieves extended information from the system tables in a database.
int	getPrecision(int column)
int	getScale(int column)
String	getSchemaName(int column)
String	getTableAlias(int column)	Gets the designated column's table alias.
String	getTableName(int column)
boolean	isAutoIncrement(int column)
boolean	isCaseSensitive(int column)
boolean	isCurrency(int column)
boolean	isDefinitelyWritable(int column)
int	isNullable(int column)
boolean	isReadOnly(int column)
boolean	isSearchable(int column)
boolean	isSigned(int column)
boolean	isWritable(int column)

Methods inherited from class org.firebirdsql.jdbc.AbstractFieldMetaData

estimateFixedPrecision, getExtFieldInfo, getFieldClassName, getFieldCount, getFieldDescriptor, getFieldType, getFieldTypeName, getPrecisionInternal, getRowDescriptor, getScaleInternal, isSignedInternal, isWrapperFor, unwrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.sql.Wrapper

isWrapperFor, unwrap

Constructor Details

FBResultSetMetaData

protected FBResultSetMetaData(RowDescriptor rowDescriptor,
 FBConnection connection)
                       throws SQLException

Creates a new FBResultSetMetaData instance.

Parameters:

rowDescriptor - a row descriptor

connection - a FBConnection value

Throws:

SQLException - if an error occurs

TODO Need another constructor for metadata from constructed result set, where we supply the ext field info.

Method Details

getColumnCount

public int getColumnCount()
                   throws SQLException

Specified by:

getColumnCount in interface ResultSetMetaData

Throws:

SQLException

isAutoIncrement

public boolean isAutoIncrement(int column)
                        throws SQLException

The current implementation always returns false.

Specified by:

isAutoIncrement in interface ResultSetMetaData

Throws:

SQLException

isCaseSensitive

public boolean isCaseSensitive(int column)
                        throws SQLException

The current implementation always returns true.

Specified by:

isCaseSensitive in interface ResultSetMetaData

Throws:

SQLException

isSearchable

public boolean isSearchable(int column)
                     throws SQLException

Specified by:

isSearchable in interface ResultSetMetaData

Throws:

SQLException

isCurrency

public boolean isCurrency(int column)
                   throws SQLException

Specified by:

isCurrency in interface ResultSetMetaData

Throws:

SQLException

isNullable

public int isNullable(int column)
               throws SQLException

Specified by:

isNullable in interface ResultSetMetaData

Throws:

SQLException

isSigned

public boolean isSigned(int column)
                 throws SQLException

Specified by:

isSigned in interface ResultSetMetaData

Throws:

SQLException

getColumnDisplaySize

public int getColumnDisplaySize(int column)
                         throws SQLException

Specified by:

getColumnDisplaySize in interface ResultSetMetaData

Throws:

SQLException

getColumnLabel

public String getColumnLabel(int column)
                      throws SQLException

Specified by:

getColumnLabel in interface ResultSetMetaData

Throws:

SQLException

getColumnName

public String getColumnName(int column)
                     throws SQLException

Specified by:

getColumnName in interface ResultSetMetaData

Throws:

SQLException

getSchemaName

public String getSchemaName(int column)
                     throws SQLException

Specified by:

getSchemaName in interface ResultSetMetaData

Returns:

Always "" as schemas are not supported.

Throws:

SQLException

getPrecision

public int getPrecision(int column)
                 throws SQLException

NOTE For NUMERIC and DECIMAL we attempt to retrieve the exact precision from the metadata, if this is not possible (eg the column is dynamically defined in the query), the reported precision is the maximum precision allowed by the underlying storage data type.

Specified by:

getPrecision in interface ResultSetMetaData

Throws:

SQLException

getScale

public int getScale(int column)
             throws SQLException

Specified by:

getScale in interface ResultSetMetaData

Throws:

SQLException

getTableName

public String getTableName(int column)
                    throws SQLException

Specified by:

getTableName in interface ResultSetMetaData

Throws:

SQLException

getTableAlias

public String getTableAlias(int column)
                     throws SQLException

Description copied from interface: FirebirdResultSetMetaData

Gets the designated column's table alias.

Specified by:

getTableAlias in interface FirebirdResultSetMetaData

Parameters:

column - the first column is 1, the second is 2, ...

Returns:

table alias or "" if not applicable

Throws:

SQLException - if a database access error occurs

getCatalogName

public String getCatalogName(int column)
                      throws SQLException

Specified by:

getCatalogName in interface ResultSetMetaData

Returns:

Always "" as catalogs are not supported

Throws:

SQLException

getColumnType

public int getColumnType(int column)
                  throws SQLException

Specified by:

getColumnType in interface ResultSetMetaData

Throws:

SQLException

getColumnTypeName

public String getColumnTypeName(int column)
                         throws SQLException

Specified by:

getColumnTypeName in interface ResultSetMetaData

Throws:

SQLException

isReadOnly

public boolean isReadOnly(int column)
                   throws SQLException

The current implementation always returns false, except for a DB_KEY column.

Specified by:

isReadOnly in interface ResultSetMetaData

Throws:

SQLException

isWritable

public boolean isWritable(int column)
                   throws SQLException

The current implementation always returns true, except for a DB_KEY column.

Specified by:

isWritable in interface ResultSetMetaData

Throws:

SQLException

isDefinitelyWritable

public boolean isDefinitelyWritable(int column)
                             throws SQLException

Specified by:

isDefinitelyWritable in interface ResultSetMetaData

Throws:

SQLException

getColumnClassName

public String getColumnClassName(int column)
                          throws SQLException

Specified by:

getColumnClassName in interface ResultSetMetaData

Throws:

SQLException

getExtendedFieldInfo

protected Map<AbstractFieldMetaData.FieldKey,AbstractFieldMetaData.ExtendedFieldInfo> getExtendedFieldInfo(FBConnection connection)
                                                                                                    throws SQLException

Description copied from class: AbstractFieldMetaData

This method retrieves extended information from the system tables in a database. Since this method is expensive, use it with care.

Specified by:

getExtendedFieldInfo in class AbstractFieldMetaData

Returns:

mapping between AbstractFieldMetaData.FieldKey instances and AbstractFieldMetaData.ExtendedFieldInfo instances, or an empty Map if the metadata implementation does not support extended info.

Throws:

SQLException - if a database error occurs while obtaining extended field information.