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EdmiError edmiGetMethodSignatureId(SdaiString methodType
SdaiString methodName,
SdaiString schemaName
SdaiInstance *methodId);
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Returns the instance of EDM_METHOD in the ExpressDataManager model that describes a given method.
A method is either an Express-X Schema Map or a query function. Related functions: edmiDefineMethodSignature, edmiDeleteMethodSignature, edmiDeleteMethodSignatureBN, edmiGetMethodSignature , edmiModifyMethodSignature edmiListMethodSignatures, edmiGetMethodSignatureBN.
Header:
#include "sdai.h"
Prototype:
EdmiError edmiGetMethodSignatureId(SdaiString methodType
SdaiString methodName,
SdaiString schemaName
SdaiInstance *methodId);
Arguments:
Arguments
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| Type | Name | Comment | |||
| SdaiString | methodType |
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| SdaiString | methodName | If the method is an Express-X Schema Map, this shall be the method name that was assigned to the method when it was defined with edmiDefineMethodSignature. | If the method is a query function, the method name shall be the name of the query function it self. | ||
| SdaiString | schemaName | If the method is an Express-X Schema Map, this variable shall be the name of the mapping schema. E.g "MySchemaMap". | If the method is a query function, this variable shall be the name of the query schema containing the query in question, qualified with the name of the parent Express schema | . E. | g: "MySchema.MyQuerySchema" |
| SdaiInstance | methodId | Variable that will receive the instance Id of the method. This is an instance of the EDM_METHOD entity in the ExpressDataManager model |
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Return Value
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Options
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Example
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EdmiError rstat; SdaiInteger nErr, nWrn; SdaiInstance qexMethodId; /* Define Schemas */ rstat = edmiDefineSchema("c:/data/person.exp", |
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"c:/temp/person.dia", |
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"Person", 0, &nWrn, &nErr); |
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rstat = edmiDefineQuerySchema("c:/data/person_queries.qex", |
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"c:/data/person_queries.dia", |
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0, &nWrn, &nErr); |
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/* Get Signature Ids */ |
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rstat = edmiGetMethodSignatureId("QEX", "SexHeavierThan", |
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"Person.Queries", &qexMethodId); |
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. . |
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. Express Schema - -------------------------------------------------------------- - |
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File : c:/data/person.exp |
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- -------------------------------------------------------------- |
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SCHEMA person; |
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ENTITY aperson; |
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name : STRING; |
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sex : STRING; |
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weight : REAL; |
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END_ENTITY; |
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END_SCHEMA; |
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Query Schema. - -------------------------------------------------------------- |
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- File : c:/data/person_queries.qex |
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- -------------------------------------------------------------- |
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QUERY_SCHEMA queries FOR person; |
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GLOBAL |
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DECLARE src INSTANCE OF person; |
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END_GLOBAL; |
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VIEW_ENTITY PersonView; |
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name : STRING; |
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sex : INTEGER; |
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weight : REAL; |
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END_VIEW_ENTITY; |
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QUERY_FUNCTION SexHeavierThan ( p_sex:INTEGER; p_weight:REAL) |
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: SET OF PersonView; |
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LOCAL |
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result : SET of PersonView; |
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currView : PersonView; |
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END_LOCAL; |
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FROM(s:src::aperson) |
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WHEN TRUE; |
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BEGIN |
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IF((s.sex = p_sex) AND (s.weight > p_weight)) THEN |
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NEW currView; |
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currView.name := s.name; |
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currView.sex := s.sex; |
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currView.weight := s.weight; |
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result ++ currView; |
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END_IF; |
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END; |
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RETURN(result); |
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END_QUERY_FUNCTION; |
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END_QUERY_SCHEMA; |
See also
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