This method defines a bound on an index key used in a range
scan, and sets bounds for index scans defined using
"Old" API usage (prior to introduction of NdbRecord). Each index key can have a lower bound, upper bound, or both. Setting the key equal to a value defines both upper and lower bounds. Bounds can be defined in any order. Conflicting definitions gives rise to an error.
Bounds must be set on initial sequences of index keys, and all but possibly the last bound must be nonstrict. This means, for example, that “a >= 2 AND b > 3” is permissible, but “a > 2 AND b >= 3” is not.
The scan may currently return tuples for which the bounds are not
satisfied. For example, a
<= 2 && b <=
3 not only scans the index up to
b=3), but also returns any
When setting bounds based on equality, it is better to use
BoundEQ instead of the equivalent pair
BoundGE. This is
especially true when the table partition key is a prefix of the
NULL is considered less than any
NULL value and equal to another
NULL value. To perform comparisons with
setBound() with a
null pointer (
An index also stores all-
NULL keys as well, and
performing an index scan with an empty bound set returns all
tuples from the table.
Signature (“Old” API). Using the “old” API, this method could be called in either of two ways. Both of these use the bound type and value; the first also uses the name of the bound, as shown here:
int setBound ( const char* name, int type, const void* value )
The second way to invoke this method under the “old” API uses the bound's ID rather than the name, as shown here:
int setBound ( Uint32 id, int type, const void* value )
Parameters (“Old” API). This method takes 3 parameters:
idof the attribute on which the bound is to be set.
type—see Section 22.214.171.124, “NdbIndexScanOperation::BoundType”.
A pointer to the bound
As used with NdbRecord.
This method is called to add a range to an index scan operation
which has been defined with a call to
add more than one range, the index scan operation must have been
defined with the
SF_MultiRange flag set. (See
Section 126.96.36.199, “NdbScanOperation::ScanFlag”.)
Where multiple numbered ranges are defined with multiple calls
setBound(), and the scan is ordered, the
range number for each range must be larger than the range number
for the previously defined range.
int setBound ( const NdbRecord* keyRecord, const IndexBound& bound )
As used with
method takes 2 parameters, listed here:
An additional version of this method can be used when the
application knows that rows in-range will be found only within a
particular partition. This is the same as that shown previously,
except for the addition of a
PartitionSpec. Doing so limits
the scan to a single partition, improving system efficiency.
Signature (when specifying a partition).
int setBound ( const NdbRecord* keyRecord, const IndexBound& bound, const Ndb::PartitionSpec* partInfo, Uint32 sizeOfPartInfo = 0 )
Parameters (when specifying a partition). This method can also be invoked with the following four parameters:
keyRecord: This is an
NdbRecordstructure corresponding to the key on which the index is defined.
boundto be added to the scan (see Section 2.3.12, “The IndexBound Structure”).
partInfo: This is a pointer to a
PartitionSpec, which provides extra information making it possible to scan a reduced set of partitions.
sizeOfPartInfo: The length of the partition specification.
bound are defined and used in the
same way as with the 2-parameter version of this method.
0 on success,