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A CTDB_ON_DATABASE_CONNECT callback is invoked after a successful database connect but before the ctdbConnect() function returns. The handle passed as a parameter with this callback is a database handle and you can safely typecast the handle parameter to a pCTDBDATABASE structure pointer.
The database connect callback can be used as an indication that the database connection is now active and that table processing may occur. This callback is a good place to set database-wide parameters that may be active until a database disconnect is performed.
Below is an example demonstrating the database connect callback to set table open and table close callbacks.
c-treeDB C API Example
CTDBRET ctdbDECL OnDatabaseConnect(CTHANDLE Handle)
{
CTDBRET Retval = CTDBRET_OK;
pCTDBDATABASE pDatabase = (pCTDBDATABASE)Handle;
if (!pDatabase)
Retval = CTDBRET_NOTDATABASE;
else
{
Retval = ctdbSetCallback(Handle, CTDB_ON_TABLE_OPEN, onTableOpen);
if (Retval == CTDBRET_OK)
Retval = ctdbSetCallback(Handle, CTDB_ON_TABLE_CLOSE, onTableClose);
}
return Retval;
}
