Stream Class

You use a Stream to read or write streamed data (usually LONG).

• A read-able stream is used to obtain streamed data from a result set or OUT bind variable from a stored procedure call. A read-able stream must be read completely until the end of data is reached or it should be closed to discard any unwanted data.
• A write-able stream is used to provide streamed data (usually LONG) to parameterized statements including callable statements.

  Stream()
  enum Status 
     {
         READY_FOR_READ, 
         READY_FOR_WRITE, 
         INACTIVE
     };
  

Summary of Stream Methods

Table 8-21 Stream Methods  

Method	Summary
readBuffer()	Reads the stream and returns the amount of data read from the Stream object.
readLastBuffer()	Reads last buffer from Stream.
writeBuffer()	Writes data from buffer to the stream.
writeLastBuffer()	Writes the last data from buffer to the stream.
status()	Returns the current status of the stream.

readBuffer()

Reads data from Stream. The size parameter specifies the maximum number of byte characters to read. Returns the amount of data read from the Stream object. -1 means end of data on the stream.

Syntax

int readBuffer(char *buffer,
   unsigned int size);

Parameters

buffer

Pointer to data buffer; must be allocated and freed by caller

size

Size of the buffer.

readLastBuffer()

This method reads the last buffer from the Stream. It can also be called top discard unread data.

The size parameter specifies the maximum number of byte characters to read. Returns the amount of data read from the Stream object. -1 means end of data on the stream.

Syntax

int readLastBuffer(char *buffer,
   unsigned int size);

Parameters

buffer

Pointer to data buffer; must be allocated and freed by caller.

size

Specifies the maximum number of bytes to be read.

writeBuffer()

Writes data from buffer to the stream. The amount of data written is determined by size.

Syntax

void writeBuffer(char *buffer,
   unsigned int size);

Parameters

buffer

Pointer to data buffer.

size

Number of char's in the buffer.

writeLastBuffer()

This method writes the last data buffer to the stream. It can also be called to write the last chunk of data.

The amount of data written is determined by size.

Syntax

void writeLastBuffer(char *buffer,
   unsigned int size);

Parameters

buffer

Pointer to data buffer.

size

Specifies the number of bytes to be written.

status()

Returns the current status of the streams, which can be one of the following:

• READY_FOR_READ
• READY_FOR_WRITE
• INACTIVE

Syntax

Status status() const;