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Java™ Platform Standard Ed. 6 |
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public interface RowId
The representation (mapping) in the Java programming language of an SQL ROWID value. An SQL ROWID is a built-in type, a value of which can be thought of as an address for its identified row in a database table. Whether that address is logical or, in any respects, physical is determined by its originating data source.
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.
DatabaseMetaData
Method Summary | |
---|---|
boolean |
equals(Object obj)
Compares this RowId to the specified object. |
byte[] |
getBytes()
Returns an array of bytes representing the value of the SQL ROWID
designated by this java.sql.RowId object. |
int |
hashCode()
Returns a hash code value of this RowId object. |
String |
toString()
Returns a String representing the value of the SQL ROWID designated by this java.sql.RowId object. |
Method Detail |
---|
boolean equals(Object obj)
RowId
to the specified object. The result is
true
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 another RowId
. 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.
equals
in class Object
obj
- the Object
to compare this RowId
object
against.
RowId
s are equal; false otherwiseObject.hashCode()
,
Hashtable
byte[] getBytes()
ROWID
designated by this java.sql.RowId
object.
String toString()
java.sql.RowId
object.
Like java.sql.Date.toString()
returns the contents of its DATE as the String
"2004-03-17"
rather than as DATE literal in SQL (which would have been the String
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 a ROWID
literal.
toString
in class Object
ROWID
designated
by this java.sql.RowId
object.int hashCode()
RowId
object.
hashCode
in class Object
RowId
Object.equals(java.lang.Object)
,
Hashtable
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Java™ Platform Standard Ed. 6 |
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