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Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 27 |
1 files changed, 19 insertions, 8 deletions
@@ -4,7 +4,7 @@ A DSL for [Clojure][1] to compose queries using the constructs of [Relational Algebra][2]. The RA constructs are then compiled into an SQL query to be run on a DBMS. `clojure-sql` doesn't connect to a database itself, but rather can be configured to perform an action -when a query is dereferenced. +when a query is to be executed. `clojure-sql` provides some utility functions beyond strict RA to allow for data to be inserted, updated and deleted. @@ -26,28 +26,39 @@ queries to be entirely special-cased per database. By default (require '[clojure-sql.core :as s]) - (-> (s/table :users) + (-> (s/table :users) ;; tables are automatically given internal aliases (s/project [:id :username])) - ; => ["SELECT \"users\".\"id\", \"users\".\"username\" FROM \"users\""] + ; => ["SELECT \"users1234\".\"id\", \"users1234\".\"username\" FROM \"users\" AS \"users1234\""] - (-> (s/table {:users :u}) + (-> (s/table :users) (s/project [:id :username]) (s/rename {:id :uid}) - (s/join (-> (s/table {:people :p}) + (s/join (-> (s/table :people) (s/project {:id :pid, :fname :first}) (s/select '(= :first "Henry"))) '(= :uid :pid)) (s/project [:username])) - ; => ["SELECT \"u\".\"username\" FROM \"users\" AS \"u\" JOIN \"people\" AS \"p\" ON (\"u\".\"id\" = \"p\".\"id\") WHERE (\"p\".\"fname\" = ?)" "Henry")] + ; => ["SELECT \"users1234\".\"username\" FROM \"users\" AS \"users1234\" JOIN \"people\" AS \"people1234\" ON (\"users1234\".\"id\" = \"people1234\".\"id\") WHERE (\"people1234\".\"fname\" = ?)" "Henry")] + + + +[clojure.java.jdbc][3] support is provided, but must be included explicitly. (require '[clojure-sql.jdbc :as jdbc]) - ; => nil + (jdbc/use-jdbc! "postgres://user:pass@localhost:5432/db") ; => nil + (deref (-> (s/table :users) + (s/project [:id :username]))) + ; => [{:id 5, :username "mange"}] + +Results are returned from queries in an eager vector. + +[3]: https://github.com/clojure/java.jdbc ## License -Copyright © 2013 FIXME +Copyright © 2013 Carlo Zancanaro Distributed under the Eclipse Public License, the same as Clojure. |