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EdmiError edmiStartModelsWriteTransaction(SdaiModel *modelIds);
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Reserves exclusive write privileges to an arbitrary number of models.
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Any number of clients may open a model for write access at the same time. This is possible because all
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persistent changes within models must be done within a model write transactions. Conflicts are avoided by only allowing one open model write transaction within each model at any point of time. If a client attempts to start a model write transaction on a selected group of models while an other client has already reserved exclusive write privileges for him self by starting a model write transaction within one or more of these models, the first client will have to wait until the ongoing transaction is either committed or aborted.
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In order to start a model write transaction on a selected group of models, all the models must be opened for write.
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Ordinary transactions may be nested within a model write transaction with edmiStartTransaction. However, model write transactions may not be nested within ordinary transactions.
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Closing a model write transaction is done by one of the following EDMInterface operations; edmiCommitTransaction, edmiAbortTransaction, edmiCommitAllTransactions, edmiAbortAllTransactions
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Arguments
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| Type | Name | Comment | ||
| SdaiModel | modelIds | Zero terminated buffer of modelIds. | Numeric modelIDs uniquely identify data models in the EDMdatabase . | The modelID is returned from the functions: sdaiCreateModel , sdaiCreateModelBN , sdaiOpenModelBN , edmiGetModel , edmiGetModelBN , sdaiGetInstanceModel |
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Return Value
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Options
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Example
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EdmiError rstat; SdaiModel modId[3]; |
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. . . |
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modId[0] = edmiGetModelBN("ourRepository", "myModel"); |
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modId[1] = edmiGetModelBN("ourRepository", "yourModel"); |
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modId[2] = 0; |
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/* Start outer model write X-action */ |
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if (edmiStartModelsWriteTransaction(modId)) { |
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printf("\nError %d in edmiStartModelsWriteTransaction: %s, rstat, |
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edmiGetErrorText(rstat)); |
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goto error; |
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} /* Nested X-actions */ |
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edmiStartTransaction(); |
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. . . |
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if (rstat) { |
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edmiAbortTransaction(); |
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} else { |
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edmiCommitTransaction(); |
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} /* Commit outer model write X-action */ |
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edmiCommitTransaction(); |
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. . . |
See also
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