I/O function sets and related types

The following table specifies the I/O functions that you must implement for the nondefault case, and their related data types.

Table 1. Nondefault I/O functions and types table
Function set Data format SQL buffer type Java™ buffer type Java™ stream implementation
Server UDR UDT Internal Representation IfxDataPointer IfmxSQLInStream IfmxSQLOutStream
Input Output Text LVARCHAR String (String Buffer) IfmxTextInStream IfmxTextOutStream
Send Receive Client Binary SENDRECV IfxDataPointer IfmxSRInStream IfmxSROutStream
Import Export Text IMPEXP IfxDataPointer IfmxIEInsStream IfmxIEOutStream
Binary Import Export Client Binary IMPEXBIN IfxDataPointer IfmxIEBinStream IfmxIEBOutStream
The columns in the preceding table represent the following:
  • Function set

    Names the type of function in conformance with UDT specifications

  • Data format

    A conceptual description of the format of the data in the SQL buffer that is being converted

  • Buffer type
    Names the actual data types being read or written
    • SQLBuffer is the SQL (or database-server) type for this data.
    • JavaBuffer is the Java™ type to which the SQLBuffer is transformed before being passed to (or returned from) the I/O method.

      It is an intermediate type that is contained in and manipulated by a Java™ Stream. It is also the argument type for input methods and the return type for output methods.

  • Java™ Stream implementation

    Names the actual stream type that is passed to the SQLData interface when the default I/O functions are used. Each of the streams implements IfmxUDTSQLInput or IfmxUDTSQLOutput.