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EdmiError edmiVersionGetAttrBN(SdaiInstance instance,
SdaiVersion version,
SdaiString attributeName,
SdaiPrimitiveType valueType,
SdaiVoid value);
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Returns the value of an attribute of a given application instance within a model version other than the current.
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The value type may also have changed between versions of the population. Use edmiVersionGetAttrDatatype to find the value type.
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Arguments
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| 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. |
| SdaiString | attributeName | Specifies the name of the attribute. Attribute names are case insensitive. |
| SdaiPrimitiveType | valueType | The primitive data type of the attribute to be read. |
| SdaiVoid | value | Variable that will receive a pointer to the value of the given attribute of <instance> for the <version> of the edmModel. |
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Return Value
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Options
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Example
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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", |
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"c:/tmp/MyFile.dia", |
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"MySchema", 0, &nWrn, &nErr); |
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/* Create Model */ |
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rstat = edmiGetRepository("MyRepository", &repId); |
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modelId = edmiCreateModelBN(repId, "MyModel", "MySchema", 0); |
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/* Populate Model */ |
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instId = edmiCreateInstanceAndPutAttrsBN(modelId, "MyEntity", 1, |
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"REAL_ATTR", sdaiREAL, 3.14); |
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/* Create version 1 */ |
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rstat = edmiCreateModelVersion("MyRepository", "MyModel", |
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"V1", &modelVersionId); |
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/* Change population */ |
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sdaiPutAttrBN(instId, "REAL_ATTR", sdaiINTEGER, 1); |
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/* Create version 2 */ |
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rstat = edmiCreateModelVersion("MyRepository", "MyModel", |
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NULL, &modelVersionId); |
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/* Get Id of version 1 */ |
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rstat = edmiGetModelVersionIdBN("MyRepository", "MyModel", |
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"V1", &modelVersionId, &version1Id); |
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/* Type is sdaiREAL */ |
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rstat = edmiVersionGetAttrDatatypeBN(instId, version1Id, |
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"REAL_ATTR", &type); |
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/* Value is 3.14 */ |
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if (type != sdaiREAL) goto error; |
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rstat = edmiVersionGetAttrBN(instId, version1Id, "REAL_ATTR", |
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type, &myReal); |
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/* Get Id of version 2 */ |
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attrId = sdaiGetAttrDefinitionBN("MySchema", "MyEntity", "REAL_ATTR"); |
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rstat = edmiGetModelVersionId(modelId, "version2", |
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&modelVersionId, &version2Id); |
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/* Type is now sdaiINTEGER */ |
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rstat = edmiVersionGetAttrDatatype(instId, version2Id, |
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attrId, &type); |
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/* Value is 1 */ |
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if (type != sdaiINTEGER) goto error; |
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rstat = edmiVersionGetAttr(instId, version2Id, attrId, |
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type, &myInteger); |
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/* Roll back to version 1 */ |
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rstat = edmiRollbackModel(modelId, version1Id, |
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KEEP_ALL_MODEL_VERSIONS); |
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/* Delete version 2 */ |
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edmiDeleteModelVersion(modelId, version2Id); |
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error: |
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. . . |
See also
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