com.bea.p13n.util.jdbc
Class OracleDatabase

java.lang.Object
  com.bea.p13n.util.jdbc.GenericDatabase
      com.bea.p13n.util.jdbc.OracleDatabase

All Implemented Interfaces:

Database

Direct Known Subclasses:

OracleThinDatabase, WlsOracleJDriverDatabase, WlsOracleThinDatabase

public abstract class OracleDatabase

extends GenericDatabase

Provides partial implementation of common functionality for Oracle JDBC drivers. Base class for Oracle driver-specific Database instances to support reading/writing of BLOB/CLOB data.

See Also:

GenericDatabase

Constructor Summary

OracleDatabase(Connection connection)

Method Summary

Clob	getClobLocator(Connection con, String tableName, String clobColumnName, String whereClause)
Clob	getClobLocatorForAdBucket(Connection con, String tableName, String clobColumnName, String whereClause, String[] bindVars)
String	getEmptyBlobInitializer() Returns the String required to initialize a BlobLocator object in an Oracle database.
String	getEmptyClobInitializer()
boolean	setClob(PreparedStatement stmt, int index, Clob clob, String data) Write to a CLOB.
protected void	trimClob(Clob clob, long newLength) Trim a CLOB to desired size.
void	updateClob(ClobKey key, String data) Updates a CLOB in the database managed tables for CLOB persistence

Methods inherited from class com.bea.p13n.util.jdbc.GenericDatabase

accept, close, close, close, close, close, close, close, close, close, commitConnection, createPreparedStatement, endBlob, endClob, getApplicationName, getBlob, getBlobLocator, getClob, getClobTableName, getConnection, getName, getProperty, printSqlWarning, readFromClob, readFromClob, setClob, startBlob, startClob, writeToClob, writeToClob

Methods inherited from class java.lang.Object

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

Constructor Detail

OracleDatabase

public OracleDatabase(Connection connection)

Method Detail

getClobLocator

public Clob getClobLocator(Connection con,
                           String tableName,
                           String clobColumnName,
                           String whereClause)
                    throws SQLException

Specified by:

getClobLocator in interface Database

Overrides:

getClobLocator in class GenericDatabase

Throws:

SQLException

getClobLocatorForAdBucket

public Clob getClobLocatorForAdBucket(Connection con,
                                      String tableName,
                                      String clobColumnName,
                                      String whereClause,
                                      String[] bindVars)
                               throws SQLException

Throws:

SQLException

getEmptyBlobInitializer

public String getEmptyBlobInitializer()
                               throws SQLException

Returns the String required to initialize a BlobLocator object in an Oracle database. Since you modify the BlobLocator object in the database instead of writing to the column directly, this helps to identify the method used to create one in a PreparedStatement such as INSERT INTO BLOB_TABLE ( ID, BLOBS ) VALUES ( ?, empty_blob() ).

Specified by:

getEmptyBlobInitializer in interface Database

Overrides:

getEmptyBlobInitializer in class GenericDatabase

Returns:

String method used to create a BlobLocator in an Oracle database.

Throws:

SQLException - on an error.

getEmptyClobInitializer

public String getEmptyClobInitializer()
                               throws SQLException

Specified by:

getEmptyClobInitializer in interface Database

Overrides:

getEmptyClobInitializer in class GenericDatabase

Throws:

SQLException

setClob

public boolean setClob(PreparedStatement stmt,
                       int index,
                       Clob clob,
                       String data)
                throws SQLException

Write to a CLOB. Write the input stream containing the ASCII data associated with the passed String to the CLOB's output stream. Streams support for updating CLOB columns is not addressed by JDBC 2.0 so this method uses an extension implemented in the delegate. This will always return false, since the Clob is written directly to the database.

Specified by:

setClob in interface Database

Overrides:

setClob in class GenericDatabase

Parameters:

stmt - the PreparedStatement

index - the paramater index

clob - the CLOB locator

Returns:

boolean executeRequired. If false then a delegate was used to directly set the CLOB in the database without using the PreparedStatement. If true then no delegate was used, or the delegate set the Clob value on the statement and the PreparedStatement must be executed to update the database.

Throws:

SQLException - on an error

trimClob

protected void trimClob(Clob clob,
                        long newLength)
                 throws SQLException

Trim a CLOB to desired size. This method does not commit the connection. In normal use, you will call this method with a connection that has auto-commit disabled. After you have called this method with such a connection you can then commit it (if you are finished with the CLOB).

If the newLength is greater than or equal to the current CLOB length (determined from Clob.length()) then nothing is done.

This trim is required because Oracle has some strange behavior for CLOB UPDATEs:

If you use UPDATE to put a small CLOB into a field that contains a larger CLOB, then the CLOB size remains unchanged. In other words, the new small CLOB data overlaps the large CLOB data and the end of the CLOB consists of the old data from the end of the large CLOB.

Throws:

SQLException

updateClob

public void updateClob(ClobKey key,
                       String data)
                throws SQLException

Updates a CLOB in the database managed tables for CLOB persistence

Throws:

SQLException