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EdmiError edmiRemoteOpenSession(SdaiServerContext serverContextId,
SdaiInstance *sessionId,
SdaiInvocationId *edmiInvocationId);
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Opens an
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EDMserver
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session. This feature has been implemented to provide all EDMInterface functionality through the remote EDMInterface calls. This function is only
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applicable for the LOCAL_CONTEXT communication type.
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No access to data in a local
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EDMdatabase
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_ is permitted before an
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EDMserver
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session is opened by this operation. If the caller is not already connected to an EDMserver
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by the edmiRemoteConnect operation, this operation will connect the caller to the EDMserver
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serverContextId
with the default EDMuser account 'sdai-user' and the EDMgroup account 'sdai-group'.
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Arguments
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| Type | Name | Comment | |
| SdaiServerContext | serverContextId | Context identification, from edmiDefineServerContext | |
| SdaiInstance | sessionId | A variable that will receive the sessionId. A sessionId is an instance of the entity SDAI_SESSION within the SDAI_SessionModel. This is a handle to all repositories and models in the EDMdatabase. | |
| SdaiInvocationId | edmiInvocationId | Currently not used. |
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Return Value
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Options
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Example
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EdmiError rstat; SdaiSession sessionId; SdaiServerContext myLocalContext; SdaiRepository repId; SdaiModel modId; SdaiAggr aggrId; SdaiInteger nInst; SdaiString unavailMsg; /* Define Remote Server Context */ rstat = edmiDefineServerContext("MyLocalContext", |
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NULL, NULL, NULL, "LOCAL_CONTEXT", NULL, NULL, |
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NULL, NULL, NULL, NULL, NULL, &myLocalContext); |
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/* Connect to a local database. This operation will |
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connect the EDMthick client to the EDMserver. |
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It
will fail if the server has no more available
named users. After the connect, the client may
be identified on the server by edmiRemoteWhoIsOn() */
rstat = edmiRemoteConnect(myLocalContext, "Johnny",
"Supervisor", "cf37ftr", &unavailMsg, NULL);
/* Open a session in the local database */
rstat = edmiRemoteOpenSession(myLocalContext, &sessionId, NULL);
/* Open the 'MyRepository' repository */
rstat = edmiRemoteOpenRepository(myLocalContext,
"MyRepository", sdaiRW, NULL, 0, 0, &repId, NULL);
/* Open the 'MyModel' model. This loads a
copy of the model to the local file system. */
rstat = edmiRemoteOpenModel(myLocalContext, "MyRepository",
"MyModel", sdaiRW, NULL, 0, 0, &modId, NULL);
. . .
/* The local copy of 'MyModel' is loaded when
the model is opened. It remains unchanged
until a transaction is started. Then the local
copy will be syncronized with the EDMserver to
include any changes made by other users in the
meantime */
rstat = edmiStartTransaction();
/* Count the current number of instances
of type MyEntity in MyModel */
rstat = edmiRemoteGetEntityExtentBN(myLocalContext,
"MyRepository", "MyModel", "MyEntity", 0,
&aggrId, &nInst, NULL, NULL);
printf("\n%d instances of MyEntity in MyModel.", nInst);
/* Terminate the transaction */
rstat = edmiAbortTransaction();
/* Close the model. Some operations may not be
performed on the model by other users for
as long as it is opened by this client. */
rstat = edmiRemoteCloseModel(myLocalContext,
"MyRepository", "MyModel", NULL, 0, 0, NULL);
. . .
/* Close the repository. This would implicitely have
closed the model as well. Some operations may not be
performed on the repository by other users for
as long as it is opened by this client. */
rstat = edmiRemoteCloseRepository(myLocalContext,
"MyRepository", NULL, 0, 0, NULL);
. . .
/* Close the session. This will implicitely
close all open models and repositories. */
rstat = edmiRemoteCloseSession(myLocalContext, NULL);
/* Disconnect. The occupied named user on the
EDMserver will be released. */
rstat = edmiRemoteDisconnect(myLocalContext, NULL);
. . . |
See also
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