oracle.sql
Class ANYDATA

java.lang.Object
  oracle.sql.ANYDATA

All Implemented Interfaces:

oracle.jdbc.internal.ObjectData, OracleData, ORAData

public class ANYDATA
extends java.lang.Object
implements ORAData, OracleData

This class is the Java mapping of the SYS.ANYDATA SQL type. Instances of this type are self-descriptive. They contain a type description as well the actual content (also called the embedded object).

You can construct an ANYDATA instance from a Datum instance using ANYDATA.convertDatum(Datum). The following example shows how to construct an ANYDATA instance that encapsulates a NUMBER:

  NUMBER num = new NUMBER(12345);
  ANYDATA anydt = ANYDATA.convertDatum(num);
  

The ANYDATA.convertDatum(Datum) method is the java equivalent of the PLSQL ConvertXXX procedures. In the previous example we could also have used PLSQL to construct the ANYDATA instance and retrieve it in Java:

  // conn being a JDBC connection
  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery("select ANYDATA.ConvertNUMBER(12345) from dual");
  ANYDATA anydt = null;
  if(rs.next())
    anydt = (ANYDATA)rs.getObject(1);
  

The public method getTypeDescriptor() returns an instance of TypeDescriptor which provides a description of the type. To retrieve the actual data, use accessDatum() which returns an instance of Datum. To know what to cast it to, use the type description. For example:

  Statement stmt = conn.createStatement();
  ResultSet rs = stmt.executeQuery("select anydatacol from foo");
  while(rs.next())
  {
    ANYDATA anydt = (ANYDATA)rs.getObject(1);
    System.out.println(anydt.stringValue());
    TypeDescriptor typedesc = anydt.getTypeDescriptor();
    Datum embeddedDatum = anydt.accessDatum();
    if(typedesc.getTypeCode() == TypeDescriptor.TYPECODE_DATE)
    {
      // the embedded object is a DATE:
      DATE datedatum = (DATE)embeddedDatum;
      // etc.
    }
    else if(typedesc.getTypeCode() == TypeDescriptor.TYPECODE_NUMBER)
    {
      // the embedded object is a NUMBER
      NUMBER numberdatum = (NUMBER)embeddedDatum;
      // etc.
    }
  }
  

Field Summary

static java.lang.String	BUILD_DATE
static boolean	TRACE

Method Summary

Datum	accessDatum() Returns the embedded object.
static ANYDATA	convertDatum(Datum datum) Constructs an ANYDATA instance from any instance of Datum.
byte[]	getData() Returns the linearized form of the embedded object value.
TypeDescriptor	getTypeDescriptor() Returns the type description of this ANYDATA instance.
boolean	isNull() Returns true if the data part of this ANYDATA instance is null and false otherwise.
boolean	isREF() Returns true if the embedded object is a REF and false otherwise.
java.lang.String	stringValue() Returns a string representation of this ANYDATA.
java.lang.String	stringValue(java.sql.Connection _connection) Returns a string representation of this ANYDATA.
Datum	toDatum(java.sql.Connection c) Extract an oracle.sql.Datum object.
java.lang.Object	toJDBCObject(java.sql.Connection c) Extract a jdbc Object.

Methods inherited from class java.lang.Object

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

Field Detail

BUILD_DATE

public static final java.lang.String BUILD_DATE

See Also:

Constant Field Values

TRACE

public static final boolean TRACE

See Also:

Constant Field Values

Method Detail

toDatum

public Datum toDatum(java.sql.Connection c)
              throws java.sql.SQLException

Description copied from interface: ORAData

Extract an oracle.sql.Datum object.

This method is invoked by setORAData() to extract a Datum. The implementation of this method must return the correct type of Datum.

Although most implementation will ignore the connection, it is occassionally needed. For example, if the class embeds CHAR attributes, connection may be needed to determine the database character set.

Specified by:

toDatum in interface ORAData

Parameters:

c - The connection into which the value is being sent.

Returns:

a Datum contaning the value to be sent into the connection.

Throws:

java.sql.SQLException - if an error occurred.

toJDBCObject

public java.lang.Object toJDBCObject(java.sql.Connection c)
                              throws java.sql.SQLException

Description copied from interface: OracleData

Extract a jdbc Object.

This method is invoked by setObject() to extract the jdbc Object. The implementation must return the jdbc Object that correctly represents the underlying SQLType.

Although most implementation will ignore the connection, it is ocassionally needed. for example, if the class embeds CHAR attributes, connection may be needed to determine the database character set.

Specified by:

toJDBCObject in interface OracleData

Parameters:

c - The connection into which the value is being sent.

Returns:

a jdbc Object contianing the value to be sent into the connection.

Throws:

java.sql.SQLException - if an error occurred.

convertDatum

public static ANYDATA convertDatum(Datum datum)
                            throws java.sql.SQLException

Constructs an ANYDATA instance from any instance of Datum.

Throws:

java.sql.SQLException

getTypeDescriptor

public TypeDescriptor getTypeDescriptor()

Returns the type description of this ANYDATA instance.

isNull

public boolean isNull()

Returns true if the data part of this ANYDATA instance is null and false otherwise.

getData

public byte[] getData()

Returns the linearized form of the embedded object value. This method is an internal method.

isREF

public boolean isREF()

Returns true if the embedded object is a REF and false otherwise.

stringValue

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

Returns a string representation of this ANYDATA. The string contains both the type code name and a string representation of the embedded object.

For example the following code:

     String sql = "select anydata.ConvertDate(TO_DATE('Jan 15, 2006, 11:00 AM', "
            +" 'Mon dd, YYYY, HH:MI AM')) from dual";
     Statement stmt = conn.createStatement();
     ResultSet rs = stmt.executeQuery(sql);
     rs.next();
     ANYDATA ad = (ANYDATA)rs.getObject(1);
     System.out.println(ad.stringValue());
    

will print in stdout the following string:

     ANYDATA TypeCode: "TYPECODE_DATE" -  ANYDATA Value: "1/15/2006 11:0:0"
    

Throws:

java.sql.SQLException

stringValue

public java.lang.String stringValue(java.sql.Connection _connection)
                             throws java.sql.SQLException

Returns a string representation of this ANYDATA. The string contains both the type code name and a string representation of the embedded object.

For example the following code:

     String sql = "select anydata.ConvertTIMESTAMPTZ(TO_TIMESTAMP_TZ("
      +" TIMESTAMP'1997-06-22 08:30:00' AT TIME ZONE 'Asia/Calcutta')) from dual";
     Statement stmt = conn.createStatement();
     ResultSet rs = stmt.executeQuery(sql);
     rs.next();
     ANYDATA ad = (ANYDATA)rs.getObject(1);
     // Pass connection to the types that require connection to print
     // eg: oracle.sql.TIMESTAMPTZ, oracle.sql.TIMESTAMPLTZ
     System.out.println(ad.stringValue(conn));
    

will print in stdout the following string:

     ANYDATA TypeCode: "TYPECODE_TIMESTAMP_TZ" - ANYDATA Value: "1997-6-22 21.0.0.0 Asia/Calcutta"
    

Parameters:

_connection - OracleConnection object

Throws:

java.sql.SQLException

accessDatum

public Datum accessDatum()
                  throws java.sql.SQLException

Returns the embedded object. Use getTypeDescripor() to retrieve type description of this embedded object. You will then be able to cast it to the right oracle.sql. class.

Throws:

java.sql.SQLException