Open Database Connectivity (ODBC) — Core Purpose and Components Which statement best captures what ODBC provides and requires across different database systems?
-
AEach vendor desiring to be ODBC-compliant provides an ODBC driver.
-
BRequires certain criteria to be met in order to establish an ODBC connection.
-
CProvides a programming interface that offers a common way for applications to access SQL databases independent of the specific RDBMS.
-
DAll of the above.
-
EODBC removes the need for any database driver on the client machine.
Answer
Correct Answer: All of the above.
Explanation
Introduction:ODBC (Open Database Connectivity) is a widely adopted standard that allows applications to access different relational databases through a uniform API. This question tests whether you recognize both the API's goal (vendor neutrality) and the practical requirements (drivers and connection criteria).
Given Data / Assumptions:
- ODBC defines a common function-call interface for SQL database access.
- Vendors supply ODBC drivers that translate generic ODBC calls into DBMS-specific protocols.
- Connections require configuration (DSN/DSN-less), credentials, and driver selection.
Concept / Approach:Evaluate whether each statement reflects ODBC realities: vendor drivers are necessary; connections require parameters (driver, server, credentials); and the API abstracts DBMS details so the same code can target multiple systems with appropriate drivers.
Step-by-Step Solution:1) Confirm ODBC's purpose: common API across heterogeneous DBMSs.2) Verify the driver model: vendors implement drivers to bridge ODBC calls to their engines.3) Validate connection prerequisites: connection strings/DSNs and authentication data are required.4) Since all three are true, choose “All of the above.”
Verification / Alternative check:Typical connection strings specify Driver, Server, Database, UID, and PWD. Without a suitable driver, ODBC cannot communicate with the DBMS.
Why Other Options Are Wrong:
- Vendor driver only: True but incomplete.
- Criteria to connect only: True but incomplete.
- Common API only: True but incomplete.
- Removes the need for any driver: False; the driver layer is essential.
Common Pitfalls:Assuming ODBC magically removes drivers or configuration; it standardizes the interface but still depends on drivers and correct connection parameters.
Final Answer:All of the above.