我无法在使用Clojure代码的应用程序中使用hikari-cp库创建连接池。
我尝试了以下代码:
(def ^:private connection-pool (atom nil))
(defn initialize! []
(reset!
connection-pool
{:datasource (hikari/make-datasource (config/db-spec))}))
config / db-spec正在获取适当的配置参数,因为我能够使用我用于make-datasource的参数连接到PostgreSQL。
我正在使用[hikari-cp“ 1.6.1”]
并且我遇到以下错误:
[INFO ] 2018-07-31 18:03:18,735 [main] com.zaxxer.hikari.HikariDataSource:<init>: db-pool - is starting.
[INFO ] 2018-07-31 18:03:48,845 [main] com.zaxxer.hikari.pool.HikariPool:shutdown: db-pool - is closing down.
Exception in thread "main" com.zaxxer.hikari.pool.HikariPool$PoolInitializationException: Exception during pool initialization: db-pool - Connection is not available, request timed out after 30009ms., compiling:<>
at com.zaxxer.hikari.pool.HikariPool.initializeConnections(HikariPool.java:526)
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:136)
at com.zaxxer.hikari.HikariDataSource.<init>(HikariDataSource.java:71)
at hikari_cp.core$make_datasource.invokeStatic(core.clj:183)
at hikari_cp.core$make_datasource.invoke(core.clj:180)
答案 0 :(得分:0)
这里是an example repo,用于将Hikari和JDBC与H2本地数据库一起进行测试。它使用当前版本:[hikari-cp "2.3.0"]
。
只需克隆存储库并运行lein test
:
~/expr/demo-jdbc > lein test
lein test _bootstrap
----------------------------------
Clojure 1.9.0 Java 10.0.1
----------------------------------
lein test demo.core
lein test tst.demo.core
lein test tst.demo.jdbc
result-0 =>
({:lang "Clojure", :desc "ancients"}
{:lang "Clojure", :desc "1.8"}
{:lang "Clojure", :desc "1.9"})
lein test tst.demo.jdbc-pool
all tests finished
Ran 4 tests containing 10 assertions.
0 failures, 0 errors.
相关部分是:
(ns xyz
(:require
[clojure.java.jdbc :as jdbc]
[hikari-cp.core :as pool]
))
(def datasource-options-sample {:auto-commit true
:read-only false
:connection-timeout 30000
:validation-timeout 5000
:idle-timeout 600000
:max-lifetime 1800000
:minimum-idle 10
:maximum-pool-size 10
:pool-name "db-pool"
:adapter "h2" ; "postgresql"
:username "sa"
:password ""
:database-name "database"
:server-name "localhost"
:port-number 5432
:register-mbeans false})
(def datasource-options {:adapter "h2"
:url "jdbc:h2:mem:demo;DB_CLOSE_DELAY=-1"
:username "sa"
:password ""})
(def ^:dynamic db-conn nil)
(defn with-connection-pool
"Creates and uses a connection for test function"
[tst-fn]
(let [datasource (pool/make-datasource datasource-options)]
(binding [db-conn {:datasource datasource}]
(tst-fn)
(pool/close-datasource datasource)))) ; close the connection - also closes/destroys the in-memory database
(use-fixtures
:once with-connection-pool) ; use the same db connection pool for all tests