The MySQL Cluster API Developer Guide :: 2 The NDB API :: 2.3 NDB API Classes, Interfaces, and Structures :: 2.3.30 The Key_part_ptr Structure
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- 2.3 NDB API Classes, Interfaces, and Structures
- 2.3.1 The Column Class
- 2.3.2 The Datafile Class
- 2.3.3 The Dictionary Class
- 2.3.4 The Event Class
- 2.3.5 The Index Class
- 2.3.6 The LogfileGroup Class
- 2.3.7 The List Class
- 2.3.8 The Ndb Class
- 2.3.9 The NdbBlob Class
- 2.3.10 The NdbDictionary Class
- 2.3.11 The NdbEventOperation Class
- 2.3.12 The NdbIndexOperation Class
- 2.3.13 The NdbIndexScanOperation Class
- 2.3.14 The NdbInterpretedCode Class
- 2.3.15 The NdbOperation Class
- 2.3.16 The NdbRecAttr Class
- 2.3.17 The NdbScanFilter Class
- 2.3.18 The NdbScanOperation Class
- 2.3.19 The NdbTransaction Class
- 2.3.20 The Object Class
- 2.3.21 The Table Class
- 2.3.22 The Tablespace Class
- 2.3.23 The Undofile Class
- 2.3.24 The Ndb_cluster_connection Class
- 2.3.25 The NdbRecord Interface
- 2.3.26 The AutoGrowSpecification Structure
- 2.3.27 The Element Structure
- 2.3.28 The GetValueSpec Structure
- 2.3.29 The IndexBound Structure
- 2.3.30 The Key_part_ptr Structure
- 2.3.31 The NdbError Structure
- 2.3.32 The OperationOptions Structure
- 2.3.33 The PartitionSpec Structure
- 2.3.34 The RecordSpecification Structure
- 2.3.35 The ScanOptions Structure
- 2.3.36 The SetValueSpec Structure
Abstract
This section describes the Key_part_ptr
structure.
Parent class. Ndb
Description.
Key_part_ptr provides a convenient way to
define key-part data when starting transactions and computing hash
values, by passing in pointers to distribution key values. When
the distribution key has multiple parts, they should be passed as
an array, with the last part's pointer set equal to
NULL. See
Section 2.3.8.1.8, “Ndb::startTransaction()”, and
Section 2.3.8.1.10, “Ndb::computeHash()”, for more information about
how this structure is used.
Attributes.
A Key_part_ptr has the attributes shown in the
following table:
| Attribute | Type | Initial Value | Description |
|---|---|---|---|
ptr |
const void* |
none | Pointer to one or more distribution key values |
len |
unsigned |
none | The length of the pointer |
