Interface RowId
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public interface RowIdThe 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, andPreparedStatement, such asgetRowIdandsetRowIdallow a programmer to access a SQLROWIDvalue. TheRowIdinterface provides a method for representing the value of theROWIDas a byte array or as aString.The method
getRowIdLifetimein the interfaceDatabaseMetaData, can be used to determine if aRowIdobject remains valid for the duration of the transaction in which theRowIdwas created, the duration of the session in which theRowIdwas 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,getRowIdLifetimespecifies the duration of aROWIDvalue'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
RowIdinterface must be fully implemented if the JDBC driver supports the data type.- Since:
- 1.6
- See Also:
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DatabaseMetaData
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method and Description booleanequals(Object obj)Compares thisRowIdto the specified object.byte[]getBytes()Returns an array of bytes representing the value of the SQLROWIDdesignated by thisjava.sql.RowIdobject.inthashCode()Returns a hash code value of thisRowIdobject.StringtoString()Returns a String representing the value of the SQL ROWID designated by thisjava.sql.RowIdobject.
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Method Detail
equals
boolean equals(Object obj)
Compares thisRowIdto the specified object. The result istrueif 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
RowIdwhen 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.- Overrides:
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equalsin classObject - Parameters:
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obj- theObjectto compare thisRowIdobject against. - Returns:
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true if the
RowIds are equal; false otherwise - Since:
- 1.6
- See Also:
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Object.hashCode(),HashMap
getBytes
byte[] getBytes()
Returns an array of bytes representing the value of the SQLROWIDdesignated by thisjava.sql.RowIdobject.- 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.RowIdobject.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 theStringDATE "2004-03-17"), toString() returns the contents of its ROWID in a form specific to the driver supplying the connection, and possibly not as aROWIDliteral.
hashCode
int hashCode()
Returns a hash code value of thisRowIdobject.- Overrides:
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hashCodein classObject - Returns:
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a hash code for the
RowId - See Also:
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Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
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