2.3.25 The NdbOperation Class

Abstract

This section discusses the NdbOperation class.

Parent class. None

Child classes. NdbIndexOperation, NdbScanOperation

Description. NdbOperation represents a “generic” data operation. Its subclasses represent more specific types of operations. See Section 2.3.25.18, “NdbOperation::Type” for a listing of operation types and their corresponding NdbOperation subclasses.

Methods. The following table lists the public methods of this class and the purpose or use of each method:

Table 2.52 NdbOperation class methods and descriptions

Name	Description
`deleteTuple()`	Removes a tuple from a table
`equal()`	Defines a search condition using equality
`getBlobHandle()`	Used to access blob attributes
`getLockHandle()`	Gets a lock handle for the operation
`getLockMode()`	Gets the operation's lock mode
`getNdbError()`	Gets the latest error
`getNdbErrorLine()`	Gets the number of the method where the latest error occurred
`getTableName()`	Gets the name of the table used for this operation
`getTable()`	Gets the table object used for this operation
`getNdbTransaction()`	Gets the `NdbTransaction` object for this operation
`getType()`	Gets the type of operation
`getValue()`	Allocates an attribute value holder for later access
`insertTuple()`	Adds a new tuple to a table
`readTuple()`	Reads a tuple from a table
`setValue()`	Defines an attribute to set or update
`updateTuple()`	Updates an existing tuple in a table
`writeTuple()`	Inserts or updates a tuple

Note

This class has no public constructor. To create an instance of NdbOperation, you must use NdbTransaction::getNdbOperation().

Types. The NdbOperation class defines three public types, shown in the following table:

Table 2.53 NdbOperation class types and descriptions

Name	Description
`AbortOption()`	Determines whether a failed operation causes failure of the transaction of which it is part
`LockMode()`	The type of lock used when performing a read operation
`Type()`	Operation access types

Note

For more information about the use of NdbOperation, see Section 1.3.2.3.2, “Single-row operations”.