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MySQL NDB Cluster API Developer Guide
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2.3.18.1 NdbBlob::ActiveHook

Abstract

ActiveHook is a data type defined for use as a callback for the setActiveHook() method. (See Section 2.3.18.16, “NdbBlob::setActiveHook()”.)

Definition.  ActiveHook is a custom data type defined as shown here:

typedef int ActiveHook
    (
      NdbBlob* me,
      void*    arg
    )

Description.  This is a callback for NdbBlob::setActiveHook(), and is invoked immediately once the prepared operation has been executed (but not committed). Any calls to getValue() or setValue() are performed first. The BLOB handle is active so readData() or writeData() can be used to manipulate the BLOB value. A user-defined argument is passed along with the NdbBlob. setActiveHook() returns a nonzero value in the event of an error.


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