Interface RowId
Methods in the interfaces ResultSet
, CallableStatement
,
and PreparedStatement
, such as getRowId
and setRowId
allow a programmer to access a SQL ROWID
value. The RowId
interface provides a method
for representing the value of the ROWID
as a byte array or as a
String
.
The method getRowIdLifetime
in the interface DatabaseMetaData
,
can be used
to determine if a RowId
object remains valid for the duration of the transaction in
which the RowId
was created, the duration of the session in which
the RowId
was created,
or, effectively, for as long as its identified row is not deleted. In addition
to specifying the duration of its valid lifetime outside its originating data
source, getRowIdLifetime
specifies the duration of a ROWID
value's valid lifetime
within its originating data source. In this, it differs from a large object,
because there is no limit on the valid lifetime of a large object within its
originating data source.
All methods on the RowId
interface must be fully implemented if the
JDBC driver supports the data type.
- Since:
- 1.6
- See Also:
-
Method Summary
Modifier and TypeMethodDescriptionboolean
Compares thisRowId
to the specified object.byte[]
getBytes()
Returns an array of bytes representing the value of the SQLROWID
designated by thisjava.sql.RowId
object.int
hashCode()
Returns a hash code value of thisRowId
object.toString()
Returns a String representing the value of the SQL ROWID designated by thisjava.sql.RowId
object.
-
Method Details
-
equals
Compares thisRowId
to the specified object. The result istrue
if and only if the argument is not null and is a RowId object that represents the same ROWID as this object.It is important to consider both the origin and the valid lifetime of a
RowId
when comparing it to anotherRowId
. If both are valid, and both are from the same table on the same data source, then if they are equal they identify the same row; if one or more is no longer guaranteed to be valid, or if they originate from different data sources, or different tables on the same data source, they may be equal but still not identify the same row. -
getBytes
byte[] getBytes()Returns an array of bytes representing the value of the SQLROWID
designated by thisjava.sql.RowId
object.- Returns:
- an array of bytes, whose length is determined by the driver supplying the connection, representing the value of the ROWID designated by this java.sql.RowId object.
-
toString
String toString()Returns a String representing the value of the SQL ROWID designated by thisjava.sql.RowId
object.Like
java.sql.Date.toString()
returns the contents of its DATE as theString
"2004-03-17" rather than as DATE literal in SQL (which would have been theString
DATE "2004-03-17"), toString() returns the contents of its ROWID in a form specific to the driver supplying the connection, and possibly not as aROWID
literal. -
hashCode
-