Retrieves the value of the designated parameter as a java.io.Reader object in the Java programming language. It is intended for use when accessing NCHAR,NVARCHAR and LONGNVARCHAR parameters.

Parameters:

parameterName

the name of the parameter

Returns:  a java.io.Reader object that contains the parameter value; if the value is SQL NULL, the value returned is null in the Java programming language

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:  1.6