데이터베이스와 통신해야하는 웹 서비스에서 작업 중이므로 기본 라이브러리를 도구로 사용하여 데스크탑의 postgres에 액세스 할 수있게되었습니다. 내 DB 라이브러리에서Clojure JDBC : Postgres 드라이버를 찾지 못했습니다.
Jun 5, 2013 1:27:46 PM com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask run
WARNING: [email protected]da -- Acquisition
Attempt Failed!!! Clearing pending acquires.
While trying to acquire a needed new resource, we failed to succeed more than the maximum number of allowed acquisition attempts (30).
Last acquisition attempt exception:
java.sql.SQLException: No suitable driver
at java.sql.DriverManager.getDriver(DriverManager.java:264)
나는 내 단위 테스트에서 다음
(ns myapp.db
(:import [com.mchange.v2.c3p0 ComboPooledDataSource]))
(def specification {
:classname "postgresql"
:subprotocol "org.postgresql.Driver"
:subname "//localhost:5432;database=test"
})
(defn pooled-data-source [specification]
(let [datasource (ComboPooledDataSource.)]
(.setDriverClass datasource (:classname specification))
(.setJdbcUrl datasource (str "jdbc:" (:subprotocol specification) ":" (:subname specification)))
(.setUser datasource (:user specification))
(.setPassword datasource (:password specification))
(.setMaxIdleTimeExcessConnections datasource (* 30 60))
(.setMaxIdleTime datasource (* 3 60 60))
{:datasource datasource}))
(def connection-pool
(delay
(pooled-data-source specification)))
(defn connection [] @connection-pool)
을 다음 있습니다 :
(ns myapp.db-test
(:use clojure.test)
(:require [myapp.db]
[clojure.java.jdbc :as jdbc]))
(let [db (myapp.db/connection)]
(jdbc/with-connection db)
(jdbc/with-query-results rs ["select * from foo"]
(doseq [row rs]
(println row)))))
그러나이 때문에 적어도 나는 데이터베이스가있는 REPL에서 작업을 아는가 연결 수락 :
user=> (require '[clojure.java.jdbc :as sql])
user=> (sql/with-connection "postgresql://localhost:5432/test"
(sql/with-query-results results ["select * from foo"]
(doseq [result results] (println result))))
{:y 2, :x 1}
nil
user=>
도움을 주시면 대단히 감사하겠습니다!
(defproject myapp "0.1.0"
:description "myapp"
:dependencies [
[org.clojure/clojure "1.5.1"]
[org.clojure/java.jdbc "0.3.0-alpha4"]
[postgresql "9.1-901.jdbc4"]
[c3p0/c3p0 "0.9.1.2"]])