How do you connect Oracle from C?

To connect to Oracle from C, you typically use the Oracle Call Interface (OCI). First, you need to include the OCI header files and link against the OCI libraries. Then, you can initialize the environment using OCIEnvCreate, allocate a handles for the connection, and use OCIHandleAlloc to create a service context. Finally, you can connect to the database using OCILogon, providing the username, passWord, and database identifier.