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2.3.29 The IndexBound Structure »
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2.3.28. The GetValueSpec Structure

Parent class.  NdbOperation

Description.  This structure is used to specify an extra value to obtain as part of an NdbRecord operation.

Members.  The makeup of this structure is shown here:

NdbOperation::GetValueSpec structure

The individual members are described in more detail in the following table:

Name Type Description
column const NdbDictionary::Column* To specify an extra value to read, the caller must provide this, as well as (optionally NULL) appStorage pointer.
appStorage void* If this pointer is null, then the received value is stored in memory managed by the NdbRecAttr object. Otherwise, the received value is stored at the location pointed to (and is still accessable via the NdbRecAttr object).

Important

It is the caller's responsibility to ensure that

  • appStorage points to sufficient space to store any returned data.

  • Memory pointed to by appStorage is not reused or freed until after the execute() call returns.

recAttr NdbRecAttr* After the operation is defined, recAttr contains a pointer to the NdbRecAttr object for receiving the data.

Important

Currently, blob reads cannot be specified using GetValueSpec.

For more information, see Section 2.3.25, “The NdbRecord Interface”.