Abstract
This section discusses the NdbOperation class.
Parent class. None
Child classes.
NdbIndexOperation,
NdbScanOperation
NdbOperation Subclasses.
The following diagram shows the relationships of
NdbOperation, its subclasses, and their public
types:
Description.
NdbOperation represents a
“generic” data operation. Its subclasses represent
more specific types of operations. See
Section 2.3.25.1.3, “The NdbOperation::Type 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:
| Method | Purpose / Use |
|---|---|
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 |
For detailed descriptions, signatures, and examples of use for each of these methods, see Section 2.3.25.2, “NdbOperation Methods”.
Types.
The NdbOperation class defines three public
types, shown in the following table:
| Type | Purpose / Use |
|---|---|
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 |
For a discussion of each of these types, along with its possible values, see Section 2.3.25.1, “NdbOperation Types”.
Class diagram.
The following diagram shows all the available methods and
enumerated types of the NdbOperation class:
For more information about the use of
NdbOperation, see
Section 1.3.2.3.1, “Single-row operations”.
