oracle.sql
Class STRUCT

java.lang.Object
  |
  +--oracle.sql.Datum
        |
        +--oracle.sql.DatumWithConnection
              |
              +--oracle.sql.STRUCT

Direct Known Subclasses:

JAVA_STRUCT

public class STRUCT

extends DatumWithConnection

implements java.sql.Struct

This class has two roles.

• It is the Oracle implementation class for the generic JDBC Struct interface.
• It wraps the "raw bytes" of an Oracle Object Type.

Like other classes in oracle.sql. it is a value class. That is, once it is constructed the user should not change its contents.

Constructor Summary

STRUCT(StructDescriptor type, java.sql.Connection conn, java.lang.Object[] attributes)
Constructor.

Method Summary

java.lang.Object[]	getAttributes() Implements the Struct interface function.
java.lang.Object[]	getAttributes(java.util.Map map) Implements the Struct interface function.
boolean	getAutoBuffering() Performance hint.
OracleConnection	getConnection()
StructDescriptor	getDescriptor() Oracle extension.
java.sql.Connection	getJavaSqlConnection()
Datum[]	getOracleAttributes() Oracle extension.
java.lang.String	getSQLTypeName() Implements the Struct interface function Retrieves the SQL type name of the SQL structured type that this Struct object represents.
boolean	isConvertibleTo(java.lang.Class jClass) Determines if datum object can be converted to a particular class
void	setAutoBuffering(boolean enable) Performance hint.
java.lang.Object	toJdbc() Oracle extension.

Methods inherited from class oracle.sql.DatumWithConnection

assertNotNull, assertNotNull, getOracleConnection

Methods inherited from class oracle.sql.Datum

asciiStreamValue, bigDecimalValue, binaryStreamValue, booleanValue, byteValue, characterStreamValue, dateValue, doubleValue, equals, floatValue, getBytes, getLength, getStream, intValue, longValue, makeJdbcArray, setBytes, setShareBytes, shareBytes, stringValue, timestampValue, timeValue

Methods inherited from class java.lang.Object

getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

STRUCT

public STRUCT(StructDescriptor type,
              java.sql.Connection conn,
              java.lang.Object[] attributes)
       throws java.sql.SQLException

Constructor. The raw bytes are computed at this time or a copy of attributes is made. In any event the caller is free to modify the array without affecting the values held in the STRUCT. For inherited object types we must check that the descriptor indicates that the type is instantiable. That database does not check on e.g. insertion but only on PL/SQL object creation. So we have to check here, too. There is an argument to be made that there is a good use for the STRUCT instance to carry data around and that the error ought to be when an insertion or udpate is attempted. But this keeps the "not instantiable" rather than "not storable" notion. And is is much more simple.

Parameters:

type - the SQLStructType used to convert the type to

attributes - the array specifying the attributes to be converted to raw bytes.

See Also:

oracle.sql.SQLStructType

Method Detail

getSQLTypeName

public java.lang.String getSQLTypeName()
                                throws java.sql.SQLException

Implements the Struct interface function Retrieves the SQL type name of the SQL structured type that this Struct object represents.

Specified by:

getSQLTypeName in interface java.sql.Struct

Throws:

java.sql.SQLException - if a database access error occurs

getAttributes

public java.lang.Object[] getAttributes()
                                 throws java.sql.SQLException

Implements the Struct interface function. Produces the ordered values of the attributes of the SQL structurec type that this Struct object represents. Each call returns a fresh array. This method uses the type map associated with the connection for customizations of the type mappings. If there is no entry in the connection's type map that matches the structured type that this Struct object represents, the driver uses the standard mapping.

Conceptually, this method calls the method getObject on each attribute of the structured type and returns a Java array containing the result.

Specified by:

getAttributes in interface java.sql.Struct

Returns:

an array containing the ordered attribute values

Throws:

java.sql.SQLException - if a database access error occurs

getAttributes

public java.lang.Object[] getAttributes(java.util.Map map)
                                 throws java.sql.SQLException

Implements the Struct interface function. Produces the ordered values of the attributes of the SQL structurec type that this Struct object represents. Each call returns a fresh array. This method uses the given type map for customizations of the type mappings. If there is no entry in the given type map that matches the structured type that this Struct object represents, the driver uses the standard mapping.

Conceptually, this method calls the method getObject on each attribute of the structured type and returns a Java array containing the result.

Specified by:

getAttributes in interface java.sql.Struct

Parameters:

map - a mapping of SQL type names to Java classes

Returns:

an array containing the ordered attribute values

Throws:

java.sql.SQLException - if a database access error occurs

getDescriptor

public StructDescriptor getDescriptor()
                               throws java.sql.SQLException

Oracle extension. Return the StructDescriptor object that contains the type information.

Returns:

the type descriptor

getOracleAttributes

public Datum[] getOracleAttributes()
                            throws java.sql.SQLException

Oracle extension. Retrun the array of Attributes as oracle.sql.XXX's. A fresh array is returned each time getOracleAttributes is called.

Returns:

datum array that containing the ordered attribute values as oracle.sql.Datum objects.

toJdbc

public java.lang.Object toJdbc()
                        throws java.sql.SQLException

Oracle extension. Returns the JDBC representation of the datum object

Returns:

an object containing the JDBC value

Throws:

java.sql.SQLException - if conversion to JDBC representation results in an error

Overrides:

toJdbc in class Datum

isConvertibleTo

public boolean isConvertibleTo(java.lang.Class jClass)

Determines if datum object can be converted to a particular class

Parameters:

cls - Class to convert to

Returns:

true, if conversion to cls is permitted false, if conversion to cls is not permitted

Overrides:

isConvertibleTo in class Datum

setAutoBuffering

public void setAutoBuffering(boolean enable)
                      throws java.sql.SQLException

Performance hint. Sets this struct's auto-buffering mode. If a struct is in auto-buffering mode, then the struct will keep a local copy of all its attributes. Then the next access to the same attributes will return a cloned copy. Otherwise, type conversion for each element is required. By default, a STRUCT is NOT in auto-buffering mode.

Parameters:

enable - - true enables auto-buffering; false disables auto-buffering

Since:

8.1.7

See Also:

getAutoBuffering()

getAutoBuffering

public boolean getAutoBuffering()
                         throws java.sql.SQLException

Performance hint. Get the current auto-buffering state.

Returns:

the current state of auto-buffering

Since:

8.1.7

See Also:

setAutoBuffering(boolean)

getJavaSqlConnection

public java.sql.Connection getJavaSqlConnection()
                                         throws java.sql.SQLException

Overrides:

getJavaSqlConnection in class DatumWithConnection

getConnection

public OracleConnection getConnection()
                               throws java.sql.SQLException

Overrides:

getConnection in class DatumWithConnection