1.4.1 Core NDB API Classes

The NDB API is an NDB Cluster application interface that implements transactions. It consists of the following fundamental classes:

• Ndb_cluster_connection represents a connection to a cluster.

• Ndb is the main class, and represents a connection to a database.

• NdbDictionary provides meta-information about tables and attributes.

• NdbTransaction represents a transaction.

• NdbOperation represents an operation using a primary key.

• NdbScanOperation represents an operation performing a full table scan.

• NdbIndexOperation represents an operation using a unique hash index.

• NdbIndexScanOperation represents an operation performing a scan using an ordered index.

• NdbRecAttr represents an attribute value.

In addition, the NDB API defines an NdbError structure, which contains the specification for an error.

It is also possible to receive events triggered when data in the database is changed. This is accomplished through the NdbEventOperation class.

The NDB event notification API is not supported prior to MySQL 5.1.

For more information about these classes as well as some additional auxiliary classes not listed here, see Section 2.3, “NDB API Classes, Interfaces, and Structures”.