All UltraLite C/C++ interfaces utilize the same UltraLite run time engine. The APIs each provide access to the same underlying functionality.
All UltraLite C/C++ interfaces share the same basic data structure for marshaling data between the UltraLite runtime and your application. This data structure is the SQL Communications Area or SQLCA. Each SQLCA has a current connection, and separate threads cannot share a common SQLCA.
Your application code must carry out the following tasks before connecting to a database:
Initialize a SQLCA. This prepares your application for communication with the UltraLite runtime.
Register your error callback function.
Start a database. This operation can be carried out as part of opening the connection.
The following functions are equivalent ways of carrying out these tasks.
| Task | Interface | Function |
|---|---|---|
| Initialize SQLCA | Embedded SQL | db_init |
| C++ | ULSqlca::Initialize | |
| Initialize SQLCA and start database | Embedded SQL |
db_init db_start_database |
| C++ | The database is started as part of the connection function in UltraLite_DatabaseManager |
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