Question 1

How to set up clojure.jdbc with PostgreSQL in a Clojure project?

Accepted Answer

Add the clojure.jdbc dependency to your project.clj or deps.edn, and include the PostgreSQL JDBC driver. Then, define a database spec with connection details and use it in queries. The documentation has basic examples to get started.

Question 2

clojure.jdbc vs next.jdbc: which should I use?

Accepted Answer

clojure.jdbc offers a more functional, idiomatic API aligned with Clojure principles, while next.jdbc is newer, often faster, and has a simpler design. Choose clojure.jdbc if you value functional composability; opt for next.jdbc for performance and ease of adoption.

Question 3

How to handle transactions with clojure.jdbc?

Accepted Answer

Use the transaction macro or functions provided by the library to wrap operations, ensuring atomicity. It supports nested transactions and rollback on errors, making it straightforward to manage data integrity in a functional style.

Question 4

Does clojure.jdbc support connection pooling with HikariCP?

Accepted Answer

Yes, you can integrate HikariCP or other pooling libraries by configuring the connection spec appropriately. The library's extensibility allows for custom connection management, though setup might require additional configuration compared to built-in solutions.

Question 5

clojure.jdbc performance compared to raw Java JDBC?

Accepted Answer

Performance is nearly equivalent to raw JDBC since it adds a thin functional layer with minimal overhead. For most applications, the difference is negligible, but complex queries might benefit from direct JDBC tuning in performance-critical scenarios.

Question 6

How to execute a parameterized query to prevent SQL injection in clojure.jdbc?

Accepted Answer

Use the query function with parameterized SQL strings and a vector of parameters, similar to JDBC prepared statements. This ensures safe execution by avoiding string concatenation, as detailed in the library's examples.

clojure.jdbc

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