setNull(String parameterName, int sqlType)

Syntax:

void setNull(String parameterName,
             int sqlType)
             throws SQLException

Description:

Sets the designated parameter to SQL NULL.

Note: You must specify the parameter's SQL type.

Parameters:

parameterName

the name of the parameter

sqlType

the SQL type code defined in java.sql.Types

Throws:

SQLException - if a database access error occurs, parameterName is not a valid parameter name, or the prepared statement has been closed

Reference:

For more information, reference JDBC documentation for: CallableStatement.setNull(String, int)