Retrieves the value of a JDBC BLOB parameter as a java.sql.Blob object in the Java programming language.

Parameters:

parameterName

the name of the parameter

Returns:  the parameter value as a Blob object in the Java programming language. If the value was SQL NULL, the value null is returned.

Exceptions:

SQLException		if parameterName does not correspond to a named parameter; if a database access error occurs or this method is called on a closed CallableStatement
SQLFeatureNotSupportedException		if the JDBC driver does not support this method

Since:  1.4