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MySQL NDB Cluster API Developer Guide
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2.3.18.9 NdbBlob::getNull()

Description.  This method checks whether the blob's value is NULL.

Signature. 

int getNull
    (
      int& isNull
    )

Parameters.  A reference to an integer isNull. Following invocation, this parameter has one of the following values, interpreted as shown here:

  • -1: The blob is undefined. If this is a nonevent blob, this result causes a state error.

  • 0: The blob has a nonnull value.

  • 1: The blob's value is NULL.

Return value.  None.