如何让emacs sql-mode使用mysql的配置文件(.my.cnf)？

Question

如何让emacs sql-mode使用mysql的配置文件(.my.cnf)？

mysqlemacssql-mode

8

当我在bash提示符下输入mysql dbname时，我可以自动连接到dbname数据库，并且包含在我的.my.cnf文件中的username、password和host信息。

当我在emacs中使用M-x sql-mysql时，我需要再次输入所有这些信息。

是否有一种方法可以让emacs sql模式使用我的.my.cnf文件中的信息？

- David LeBauer

4个回答

4

当然是可以的。不过，这需要一些工作。

大致步骤如下：

1. 使用 ini.el 读取和解析 ini 文件。 2. 将不同主机的配置与客户端的配置合并，因为后者是全局应用的。 3. 将每个主机转换为适合 sql-connection-alist 的格式。 4. 填充 sql-connection-alist。 5. 使用 M-x sql-connect（自动完成！）。

以下代码还包括一个 .pgpass 解析器，以防万一。您会注意到实现更为简单。

;;; .pgpass parser
(defun read-file (file)
  "Returns file as list of lines."
  (with-temp-buffer
    (insert-file-contents file)
    (split-string (buffer-string) "\n" t)))

(defun pgpass-to-sql-connection (config)
  "Returns a suitable list for sql-connection-alist from a pgpass file."
          (let ((server (lambda (host port db user _pass)
                          (list
                           (concat db ":" user ":" port ":" host)
                           (list 'sql-product ''postgres)
                           (list 'sql-server host)
                           (list 'sql-user user)
                           (list 'sql-port (string-to-number port))
                           (list 'sql-database db))))
                (pgpass-line (lambda (line)
                               (apply server (split-string line ":" t)))))
            (mapcar pgpass-line config)))

;;; .my.cnf parser
;;; Copied verbatim from https://github.com/daniel-ness/ini.el/blob/master/ini.el
(defun ini-decode (ini_text) 
  ;; text -> alist
  (interactive)
  (if (not (stringp ini_text))
      (error "Must be a string"))
  (let ((lines (split-string ini_text "\n"))
    (section)
    (section-list)
    (alist))
    (dolist (l lines)
      ;; skip comments
      (unless (or (string-match "^;" l)
          (string-match "^[ \t]$" l))
    ;; catch sections
    (if (string-match "^\\[\\(.*\\)\\]$" l)
        (progn 
          (if section
          ;; add as sub-list
          (setq alist (cons `(,section . ,section-list) alist))
        (setq alist section-list))
          (setq section (match-string 1 l))
          (setq section-list nil)))
          ;; catch properties
          (if (string-match "^\\([^\s\t]+\\)[\s\t]*=[\s\t]*\\(.+\\)$" l)
          (let ((property (match-string 1 l))
            (value (match-string 2 l)))
            (progn 
              (setq section-list (cons `(,property . ,value) section-list)))))))
    (if section
    ;; add as sub-list
    (setq alist (cons `(,section . ,section-list) alist))
      (setq alist section-list))
    alist))

(defun read-ini (file)
  "Returns ini file as alist."
  (with-temp-buffer
    (insert-file-contents file)
    (ini-decode (buffer-string))))

(defun filter-alist (wanted-members alist)
  "Returns a copy of given alist, with only fields from wanted-members."
  (let ((result nil)
        (add-if-member (lambda (elt)
                         (when (member (car elt) wanted-members)
                           (add-to-list 'result elt t)))))
    (mapc add-if-member alist)
    result))

(defun merge-alist (original override)
  "Returns a union of original and override alist. On key conflict, the latter wins."
  (let ((result (copy-alist override))
        (add (lambda (elt)
               (setq result (add-to-list
                             'result elt t
                             (lambda (left right) (equal (car left) (car right))))))))
    (mapc add original)
    result))
    
(defun parse-mycnf-hosts (file-path)
  "Returns list of hosts with clients' section applied to all hosts."
  (let ((hosts nil)
        (global nil)
        (fields '("user" "host" "database" "password" "port"))
        (section-parse (lambda(section)
                         (if (equal (car section) "client")
                             (setq global (filter-alist fields (cdr section)))
                           (let ((host (car section))
                                 (config (filter-alist fields (cdr section))))
                             (when config (add-to-list 'hosts (cons host config) t))))))
        (merge-host-with-global (lambda (host)
                                  (cons (car host) (merge-alist global (cdr host))))))
    (mapc section-parse (read-ini file-path))
    (mapcar merge-host-with-global hosts)))

(defun mycnf-to-sql-connection (config)
  (let ((add-sql-product
     (lambda (config)
       (let ((head (car config))
             (tail (cdr config)))
         (cons head (append tail (list (list 'sql-product ''mysql)))))))
    (parse-keys-and-values
     (lambda (config)
       (let ((head (car config))
             (tail (cdr config)))
         (cons
          head
          (mapcar
           (lambda (element)
            (let ((key (car element))
                  (value (cdr element)))
              (cond ((equal key "host") (list 'sql-server value))
                    ((equal key "port") (list 'sql-port (string-to-number value)))
                    ((equal key "user") (list 'sql-user value))
                    ((equal key "password") (list 'sql-password value))
                    ((equal key "database") (list 'sql-database value))
                    (t (error (format "Unknown key %s" key))))))
           tail))))))
  (mapcar add-sql-product (mapcar parse-keys-and-values config))))

;;; Actually populating sql-connection-alist
(setq sql-connection-alist
      (append
       (mycnf-to-sql-connection (parse-mycnf-hosts "~/.my.cnf"))
       (pgpass-to-sql-connection (read-file "~/.pgpass"))
       ))

使用以下 .my.cnf 文件：

[client]
user=me

[host1]
database=db1
host=db.host1.com

[host2]
database=db2
user=notme
host=db.host2.com

执行表达式(mycnf-to-sql-connection (parse-mycnf-hosts "~/.my.cnf"))会给我返回以下结果（手动美化输出）：

(("host2" ((sql-server "db.host2.com")
           (sql-user "notme")
           (sql-database "db2")))
 ("host1" ((sql-server "db.host1.com")
           (sql-database "db1")
           (sql-user "me"))))

最后，不要使用M-x sql-mysql，而是使用M-x sql-connect，这样你就可以使用别名进行连接，并且具有自动补全功能。

- ibizaman

1

为了实现这一点，我们需要“欺骗”sql-mode运行mysql --login-path=some-connection-name some-db-name（其中--login-path是sql-mode默认不传递的参数）。

通过以下命令在sql端创建您的命名连接（默认情况下存储在.mylogin.cnf中）： mysql_config_editor set --login-path=wow --host=127.0.0.1 --port=3306 --user=root --password 然后在emacs端将连接标记如下（在您的init.el中）：

(setq sql-connection-alist
  '((wow-local
     (sql-product 'mysql)
     (sql-mysql-options '("--login-path=wow")) ; Note: use the login-path specified earlier
     (sql-server "") ; Note: All of these empty string parameters prevent being prompted for these values and are ignored.
     (sql-user "")
     (sql-password "")
     (sql-database "wowza"))
    (wow-local-test
     (sql-product 'mysql)
     (sql-mysql-options '("--login-path=wow")) ; Note: You can have multiple connections using the same login-path just with different parameters
     (sql-server "")
     (sql-user "")
     (sql-password "")
     (sql-database "wowza-test"))
    (production
     (sql-product 'mysql)
     (sql-mysql-options '("--login-path=production"))
     (sql-server "")
     (sql-port 0) ; Note: 0 ignores, anything else overrides your .cnf
     (sql-user "")
     (sql-password "")
     (sql-database "wowza_prod"))))

最终，我们创建了SQL连接，并在emacs端标记了我们的连接，我们可以运行M-x sql-connect，然后会提示您选择一个连接。

注意：

设置emacs变量sql-mysql-options允许您使用在.mylogin.cnf文件中定义的连接（对于其他.cnf文件可能会有所不同）（您还可以使用此选项传递任何mysql参数）
将sql-server、sql-user等设置为空字符串可防止提示输入该值
将sql-server、sql-user等设置为非空字符串将覆盖.cnf中设置的值
有关忽略参数的逻辑，请参见sql.el文件中的M-x (describe-variable sql-mysql-options)和M-x (describe-function sql-comint-mysql)

TLDR：使用sql-mysql-options和--login-path=<your-login-path>魔法。

- emactaggart

-3

只需按回车键，它将默认被捕获。

- Dan Bolser

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可以查看英文原文，
原文链接

- Bozhidar Batsov · Accepted Answer

我认为这是不可能的，但你可以在模式配置中设置这样的内容：

(setq sql-connection-alist
'((pool-a
(sql-product 'mysql)
(sql-server "1.2.3.4")
(sql-user "me")
(sql-password "mypassword")
(sql-database "thedb")
(sql-port 3306))
(pool-b
(sql-product 'mysql)
(sql-server "1.2.3.4")
(sql-user "me")
(sql-password "mypassword")
(sql-database "thedb")
(sql-port 3307))))

(defun sql-connect-preset (name)
  "Connect to a predefined SQL connection listed in `sql-connection-alist'"
  (eval `(let ,(cdr (assoc name sql-connection-alist))
    (flet ((sql-get-login (&rest what)))
      (sql-product-interactive sql-product)))))

(defun sql-pool-a ()
  (interactive)
  (sql-connect-preset 'pool-a))

可以查看这篇文章获取更多信息。