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.
2.3.15.1.2. The NdbBlob::State Type
Abstract
This is an enumerated data type which represents the possible
states of an NdbBlob
instance.
Description.
An NdbBlob may assume any one
of these states
Enumeration values.
Possible values are shown, along with descriptions, in the
following table:
Value
Description
Idle
The NdbBlob has not yet been prepared
for use with any operations.
Prepared
This is the state of the NdbBlob prior
to operation execution.
Active
This is the BLOB handle's state following execution
or the fetching of the next result, but before the
transaction is committed.
Closed
This state occurs after the transaction has been committed.
Invalid
This follows a rollback or the close of a transaction.
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