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http://www.zorba-xquery.com/modules/store/static/indexes/dml
import module namespace idml = "http://www.zorba-xquery.com/modules/store/static/indexes/dml";
This module defines a set of functions to probe and refresh indexes which are declared in the prolog of a module.
This module is part of Zorba's XQuery Data Definition Facility. All the indexes managed by this module have to be pre-declared in the prolog of a library module. Please refer to the general documentation for more information and examples.
Zorba Team
xquery version "3.0" encoding "utf-8";
- the XQuery module can be found here.
For more details please also see:
- Data Lifecycle
- XQuery Data Definition Facility
- http://www.zorba-xquery.com/modules/store/static/indexes/ddl
- http://www.zorba-xquery.com/modules/store/static/collections/dml
- http://www.zorba-xquery.com/modules/store/static/collections/ddl
- http://www.zorba-xquery.com/modules/store/static/integrity_constraints/ddl
- http://www.zorba-xquery.com/modules/store/static/integrity_constraints/dml
- http://www.zorba-xquery.com/errors
ann | http://www.zorba-xquery.com/annotations |
idml | http://www.zorba-xquery.com/modules/store/static/indexes/dml |
ver | http://www.zorba-xquery.com/options/versioning |
zerr | http://www.zorba-xquery.com/errors |
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probe-index-point-general
(
$name as xs:QName,
$key as xs:anyAtomicType*
) as node()* external The probe-index-point-general function retrieves from an index the domain nodes associated by general equality with a given search sequence . |
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probe-index-point-value
(
$name as xs:QName,
$key_i as xs:anyAtomicType?
) as node()* external The probe-index-point-value function retrieves from an index the domain nodes associated by value equality with a given search tuple. |
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probe-index-range-general
(
$name as xs:QName,
$lowerBound as xs:anyAtomicType*,
$upperBound as xs:anyAtomicType*,
$haveLowerBound as xs:boolean,
$haveUpperBound as xs:boolean,
$lowerBoundIncluded as xs:boolean,
$upperBoundIncluded as xs:boolean
) as node()* external The probe-index-range-general function retrieves the domain nodes associated by general order-comparison (operators <=, <, >=, >) with one or two search sequences. |
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probe-index-range-value
(
$name as xs:QName,
$lowerBound-i as xs:anyAtomicType?,
$upperBound-i as xs:anyAtomicType?,
$haveLowerBound-i as xs:boolean,
$haveUpperBound-i as xs:boolean,
$lowerBoundIncluded-i as xs:boolean,
$upperBoundIncluded-i as xs:boolean
) as node()* external The probe-index-range-value function retrieves the domain nodes associated by value order-comparison (operators le, lt, ge, gt) with a given search box. |
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refresh-index
(
$name as xs:QName
) external The refresh-index function is an updating function which updates the index with the given name. |
declare function idml:probe-index-point-general ( $name as xs:QName, $key as xs:anyAtomicType* ) as node()* external
The probe-index-point-general function retrieves from an index the domain nodes associated by general equality with a given search sequence . The search sequence consists of an arbitrary number of search keys, where each search key is an atomic item. The function is supported by general indexes only. Its result is either an error or the set of domain nodes for which the following xquery expression returns true:
$keys = $node/keyExprwhere keyExpr is the expression specified in the keyspec of the index (remember that for general indexes, there can be only one keyspec).
- $name The QName of the index to probe.
- $key The search sequence.
- The set of domain nodes that satisfy the search condition.
- zerr:ZDDY0021 if the index with name $name is not declared.
- zerr:ZDDY0023 if the index with name $name does not exist.
- zerr:ZDDY0029 if the index is not general.
- err:XPTY0004 if the search sequence contains a search key, whose type does not match the sequence type specified in the keyspec of the index.
declare %ann:variadic function idml:probe-index-point-value ( $name as xs:QName, $key_i as xs:anyAtomicType? ) as node()* external
The probe-index-point-value function retrieves from an index the domain nodes associated by value equality with a given search tuple. The search tuple consists of a number of search keys, where each search key is either an atomic item or the empty sequence. The number of search keys given must be equal to the number of keys declared for the index. Since the number of keys differs from one index to another, this function is variadic.
The result of the function is either an error or the set of domain nodes for which the following xquery expression returns true:
$key1 eq $node/keyExpr1 and ... and $keyM eq $node/keyExprMwhere keyExpri is the expression specified in the i-th keyspec of the index.
- $name The QName of the index to probe
- $key_i the search keys used to probe the index with. The i-th search key corresponds to the i-th key expression in the index declaration.
- The set of domain nodes that satisfy the search condition.
- zerr:ZDDY0021 if the index with name $name is not declared.
- zerr:ZDDY0023 if the index with name $name does not exist.
- zerr:ZDDY0025 if the number of search keys passed as arguments is not the same as the number of keys declared for the index.
- err:XPTY0004 if a non-empty seach key is given, whose type does not match the sequence type specified in the corresponding keyspec.
declare function idml:probe-index-range-general ( $name as xs:QName, $lowerBound as xs:anyAtomicType*, $upperBound as xs:anyAtomicType*, $haveLowerBound as xs:boolean, $haveUpperBound as xs:boolean, $lowerBoundIncluded as xs:boolean, $upperBoundIncluded as xs:boolean ) as node()* external
The probe-index-range-general function retrieves the domain nodes associated by general order-comparison (operators <=, <, >=, >) with one or two search sequences. Each search sequence consists of an arbitrary number of search keys, where each search key is an atomic item. This method is supported by general range indexes only. Its result is either an error or the set of domain nodes for which the following xquery expression returns true:
if ($haveLowerBound and $haveUpperBound) then $lowerBoundKeys lop $node/keyExpr and $node/keyExpr uop $upperBoundKeys else if ($haveLowerBound) then $lowerBoundKeys lop $node/keyExpr else if ($haveUpperBound) then $node/keyExpr uop $upperBoundKeys else fn:true()
where keyExpr is the expression specified in the keyspec of the index, lop is either the <= or the < operator depending on whether $lowerBoundsIncluded is true or false, and uop is either the <= or the < operator depending on whether $upperBoundsIncluded is true or false
.- $name The QName of the index to probe.
- $lowerBound The lower bound search sequence.
- $upperBound The upper bound search sequence.
- $haveLowerBound Whether a lower bound search sequence exists or not.
- $haveUpperBound Whether an upper bound search sequence exists or not.
- $lowerBoundIncluded Whether to use the <= or the < operator when comparing a search key from $lowerBound with an index key.
- $upperBoundIncluded Whether to use the <= or the < operator when comparing an index key with a search key from $upperBound.
- The set of domain nodes that satisfy the search condition
- zerr:ZDDY0021 if the index with name $name is not declared.
- zerr:ZDDY0023 if the index with name $name does not exist.
- zerr:ZDDY0030 if the index is not a general range index.
- err:XPTY0004 if $haveLowerBound is true and $lowerBoundKeys constains an atomic item whose type does not match the sequence type specified by the index keyspec, or $haveUpperBound is true and $upperBoundKeys contains an atomic item whose type does not match the sequence type specified by the index keyspec.
declare %ann:variadic function idml:probe-index-range-value ( $name as xs:QName, $lowerBound-i as xs:anyAtomicType?, $upperBound-i as xs:anyAtomicType?, $haveLowerBound-i as xs:boolean, $haveUpperBound-i as xs:boolean, $lowerBoundIncluded-i as xs:boolean, $upperBoundIncluded-i as xs:boolean ) as node()* external
The probe-index-range-value function retrieves the domain nodes associated by value order-comparison (operators le, lt, ge, gt) with a given search box. The search box is specified as a number M of rangespecs , where each rangespec consists of six values. The number M must be greater than 0 and less than or equal to the number N of keyspecs found in the index declaration. If M is less than N, then the "missing" rangespecs are assumed to have the following value: [(), (), false, false, false, false]. As a result, we can assume that M is equal to N (Remember that for general indexes, there can be only one IndexKeySpec, and as a result, for general indexes, M = N = 1). Since the number of keys differs from one index to another, this function is variadic.
The ith rangespec corresponds to the ith keyspec, and specifies a search condition on the key values that are produced by evaluating that keyspec for every domain node. Specifically, we define the ith rangespec result as the set of domain nodes for which the following xquery expression returns true:
if ($haveLowerBound-i and $haveUpperBound-i) then $lowerBound-i lop $node/keyExpr-i and $node/keyExpr-i uop $upperBound-i else if ($haveLowerBound-i) then $lowerBound-i lop $node/keyExpr-i else if ($haveUpperBound-i) then $node/keyExpr-i uop $upperBound-i else fn:true()
where keyExpr-i is the expression specified by the ith keyspec of the index, lop is either the le or the lt operator depending on whether $lowerBoundsIncluded-i is true or false, and uop is either the le or the lt operator depending on whether $upperBoundsIncluded-i is true or false.
The result of the probe-index-range-value function is either an error, or the intersection of all the rangespec results.
- $name The QName of the index to probe
- $lowerBound-i The lower bound in a range of key values.
- $upperBound-i The upper bound in a range of key values.
- $haveLowerBound-i If false, then there is no lower bound, or equivalently, the lower bound is -INFINITY. Otherwise, the lower bound is the one given by the lowerBound-i value.
- $haveUpperBound-i If false, then there is no upper bound, or equivalently, the upper bound is +INFINITY. Otherwise, the upper bound is the one given by the upperBound-i value.
- $lowerBoundIncluded-i If false, then the range is open from below, i.e., the lowerBound-i value is not considered part of the range. Otherwise, the range is closed from below, i.e., the lowerBound-i value is part of the range.
- $upperBoundIncluded-i If false, then the range is open from above, i.e., the upperBound-i value is not considered part of the range. Otherwise, the range is closed from above, i.e., the upperBound-i value is part of the range.
- The set of domain nodes that satisfy the search condition.
- zerr:ZDDY0021 if the index with name $name is not declared.
- zerr:ZDDY0023 if the index with name $name does not exist.
- zerr:ZDDY0025 if the number of rangespecs passed as arguments is zero or greater than the number of keys declared for the index.
- zerr:ZDDY0026 if the index is not a range index.
- err:XPTY0004 if $haveLowerBound-i is true and $lowerBound-i is an atomic item whose type does not match the sequence type specified by the ith keyspec, or $haveUpperBound-i is true and $upperBound-i is an atomic item whose type does not match the sequence type specified by the ith keyspec.
- zerr:ZDDY0034 if (a) the index is general (in which case there is only one rangespac), (b) the index is untyped, (c) there is both a lower and an upper bound, and (d) if T1 and T2 are the types of the lower and upper bound, neither T1 is a subtype of T2 nor T2 is a subtype of T1.
declare updating function idml:refresh-index (
$name as xs:QName
) external
The refresh-index function is an updating function which updates the index with the given name. Note that if the maintenance property of the index is automatic, this function is a NOP.
- $name The QName of the index to refresh.
- The result of the function is an empty XDM instance and a pending update list which, when applied, refreshes the contents of the index.that consists of a
- zerr:ZDDY0021 if the index with name $name is not declared.
- zerr:ZDDY0023 if the index with name $name does not exist.