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2.3.9.2 NdbBlob Methods »
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2.3.9.1. NdbBlob Types

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2.3.9.1.1. The NdbBlob::ActiveHook Type
2.3.9.1.2. The NdbBlob::State Type

Abstract

This section details the public types belonging to the NdbBlob class.

2.3.9.1.1. The NdbBlob::ActiveHook Type

Abstract

ActiveHook is a datatype defined for use as a callback for the setActiveHook() method. (See Section 2.3.9.2.4, “NdbBlob::setActiveHook()”.)

Definition.  ActiveHook is a custom datatype 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. ActiveHook() returns a nonzero value in the event of an error.

2.3.9.1.2. The NdbBlob::State Type

Abstract

This is an enumerated datatype which represents the possible states of an NdbBlob instance.

Description.  An NdbBlob may assume any one of these states

Enumeration values. 

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.