5

按照这个例子

https://github.com/clojure/java.jdbc/blob/master/doc/clojure/java/jdbc/ConnectionPooling.md

的 jdbc 连接池,我在 Clojure 应用程序中设置了一个连接池到 SQLServer,如下所示

;; Database Connection Handling.
(ns myapp.db
    (:import [com.mchange.v2.c3p0 ComboPooledDataSource]))

;; ### specification
;; Defines the database connection parameters.
(def specification {
    :classname "com.microsoft.sqlserver.jdbc.SQLServerDriver"
    :subprotocol "sqlserver"
    :subname "//some;info;here"
})

;; ### pooled-data-source
;; Creates a database connection pool using the
;; <a href="https://github.com/swaldman/c3p0">c3p0</a> JDBC
;; connection pooling library.
(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}))

;; ### connection-pool
;; Creates the connection pool when first called.
(def connection-pool
    (delay
        (pooled-data-source specification)))

;; ### connection
;; Get a connection from the connection pool.
(defn connection [] @connection-pool)

我知道如何使用连接进行选择和插入语句等,我的问题是我将如何使用它来调用存储过程并收集输出,这些输出可能是各种形状和大小的记录?

;; ### Definitions of queries.
(ns myapp.query
     (:require [myapp.db]))

;; HOW DO I CALL THIS PROC THROUGH A POOLED CONNECTION?
(defn call-the-stored-proc []
    (str "{ call someStoredProcForMyApp("...")}"))
4

1 回答 1

3

对于不需要 OUT 参数的基本存储过程,您可以使用db-do-prepared.

(require '[clojure.java.jdbc :as j])
(j/db-do-prepared (connection) "EXEC YourStoredProc ?" [COLUMN_NAME])

它调用您的connection函数,这与文档所说的调用相同。

我已经开始致力于为 JDBC 添加完整的可调用语句支持,但我还没有时间完成这项工作。这是Clojue 的 JIRA 中的问题JDBC-48 ,我的进度在我的 fork 的 sprocs 分支中

于 2013-07-03T01:09:58.790 回答