edmiVersionGetAttr

EdmiError edmiVersionGetAttr(SdaiInstance      instance,
                              SdaiVersion       version,
                              SdaiAttr          attributeId,
                              SdaiPrimitiveType valueType,
                              SdaiVoid          value);

Returns the value of an attribute of a given application instance within a model version other than the current. The value type may also have changed between versions of the population. Use edmiVersionGetAttrDatatype to find the value type.

Arguments

Type	Name	Comment
SdaiInstance	instance	The instanceID of an application instance in the edmModel for which an attribute shall be read in from an earlier version of the model.
SdaiVersion	version	The version number of the edmModel in question. The version number is a sequence number counting from one with an increment of one for each new model version created.
SdaiAttr	attributeId	The attributeID that uniquely identifies the attribute definition instance in the EDMdatabase. The attributeID is returned from the sdaiGetAttrDefinition and sdaiGetAttrDefinitionBN functions.
SdaiPrimitiveType	valueType	The primitive data type of the attribute to be read. Legal data types are: sdaiINTEGER, sdaiREAL, sdaiSTRING, sdaiBOOLEAN, sdaiLOGICAL, sdaiBINARY, sdaiENUMERATION, sdaiAGGR, sdaiINSTANCE, sdaiADB .
SdaiVoid	value	Variable that will receive a pointer to the value of the given attribute of <instance> for the <version> of the edmModel.

Return Value

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Options

Example

EdmiError rstat;
 SdaiInteger nWrn, nErr;
 SdaiRepository repId;
 SdaiModel modelId;
 SdaiVersion version1Id, version2Id;
 SdaiModelVersion modelVersionId;
 SdaiInteger myInteger;
 SdaiReal myReal;
 SdaiInstance instId;
 SdaiAttr attrId;
 SdaiPrimitiveType type;
  
 /* Compile schema */
 rstat = edmiCompileFile("c:/data/MyFile.exp",
 "c:/tmp/MyFile.dia", 
 "MySchema", 0, &nWrn, &nErr); 
 /* Create Model */
 rstat = edmiGetRepository("MyRepository", &repId);
 modelId = edmiCreateModelBN(repId, "MyModel", "MySchema", 0);
 /* Populate Model */
 instId = edmiCreateInstanceAndPutAttrsBN(modelId, "MyEntity", 1,
 "REAL_ATTR", sdaiREAL, 3.14);  
 /* Create version 1 */
 rstat = edmiCreateModelVersion("MyRepository", "MyModel",
 "V1", &modelVersionId); 
 /* Change population */
 sdaiPutAttrBN(instId, "REAL_ATTR", sdaiINTEGER, 1);
 /* Create version 2 */
 rstat = edmiCreateModelVersion("MyRepository", "MyModel",
 NULL, &modelVersionId); 
 /* Get Id of version 1 */
 rstat = edmiGetModelVersionIdBN("MyRepository", "MyModel",
 "V1", &modelVersionId, &version1Id); 
 /* Type is sdaiREAL */
 rstat = edmiVersionGetAttrDatatypeBN(instId, version1Id,
 "REAL_ATTR", &type);
 /* Value is 3.14 */ 
 if (type != sdaiREAL) goto error;
 rstat = edmiVersionGetAttrBN(instId, version1Id, "REAL_ATTR",
 type, &myReal); 
 /* Get Id of version 2 */
 attrId = sdaiGetAttrDefinitionBN("MySchema", "MyEntity", "REAL_ATTR");
 rstat = edmiGetModelVersionId(modelId, "version2",
 &modelVersionId, &version2Id); 
 /* Type is now sdaiINTEGER */
 rstat = edmiVersionGetAttrDatatype(instId, version2Id,
 attrId, &type); 
 /* Value is 1 */
 if (type != sdaiINTEGER) goto error;
 rstat = edmiVersionGetAttr(instId, version2Id, attrId,
 type, &myInteger);
 /* Roll back to version 1 */
 rstat = edmiRollbackModel(modelId, version1Id,
 KEEP_ALL_MODEL_VERSIONS); 
 /* Delete version 2 */
 edmiDeleteModelVersion(modelId, version2Id);
 error:
 . . .

EDMsix

edmiVersionGetAttr

Arguments

Return Value

Options

Example

See also

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