;;;; Original code by Pierre R. Mai
;;;; Date Started: Feb 2002
;;;;
-;;;; $Id: sql.cl,v 1.7 2002/03/26 14:11:59 kevin Exp $
+;;;; $Id: sql.cl,v 1.13 2002/04/27 20:58:11 kevin Exp $
;;;;
;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
;;;; and Copyright (c) 1999-2001 by Pierre R. Mai
;;; Simple implementation of SQL along the lines of Harlequin's Common SQL
-;;; Conditions
-(define-condition clsql-condition ()
- ())
-
-(define-condition clsql-error (error clsql-condition)
- ())
-
-(define-condition clsql-simple-error (simple-condition clsql-error)
- ())
-
-(define-condition clsql-warning (warning clsql-condition)
- ())
-
-(define-condition clsql-simple-warning (simple-condition clsql-warning)
- ())
-
-(define-condition clsql-invalid-spec-error (clsql-error)
- ((connection-spec :initarg :connection-spec
- :reader clsql-invalid-spec-error-connection-spec)
- (database-type :initarg :database-type
- :reader clsql-invalid-spec-error-database-type)
- (template :initarg :template
- :reader clsql-invalid-spec-error-template))
- (:report (lambda (c stream)
- (format stream "The connection specification ~A~%is invalid for database type ~A.~%The connection specification must conform to ~A"
- (clsql-invalid-spec-error-connection-spec c)
- (clsql-invalid-spec-error-database-type c)
- (clsql-invalid-spec-error-template c)))))
-
-(defmacro check-connection-spec (connection-spec database-type template)
- "Check the connection specification against the provided template,
-and signal an clsql-invalid-spec-error if they don't match."
- `(handler-case
- (destructuring-bind ,template ,connection-spec
- (declare (ignore ,@template))
- t)
- (error () (error 'clsql-invalid-spec-error
- :connection-spec ,connection-spec
- :database-type ,database-type
- :template (quote ,template)))))
-
-(define-condition clsql-connect-error (clsql-error)
- ((database-type :initarg :database-type
- :reader clsql-connect-error-database-type)
- (connection-spec :initarg :connection-spec
- :reader clsql-connect-error-connection-spec)
- (errno :initarg :errno :reader clsql-connect-error-errno)
- (error :initarg :error :reader clsql-connect-error-error))
- (:report (lambda (c stream)
- (format stream "While trying to connect to database ~A~% using database-type ~A:~% Error ~D / ~A~% has occurred."
- (database-name-from-spec
- (clsql-connect-error-connection-spec c)
- (clsql-connect-error-database-type c))
- (clsql-connect-error-database-type c)
- (clsql-connect-error-errno c)
- (clsql-connect-error-error c)))))
-
-(define-condition clsql-sql-error (clsql-error)
- ((database :initarg :database :reader clsql-sql-error-database)
- (expression :initarg :expression :reader clsql-sql-error-expression)
- (errno :initarg :errno :reader clsql-sql-error-errno)
- (error :initarg :error :reader clsql-sql-error-error))
- (:report (lambda (c stream)
- (format stream "While accessing database ~A~% with expression ~S:~% Error ~D / ~A~% has occurred."
- (clsql-sql-error-database c)
- (clsql-sql-error-expression c)
- (clsql-sql-error-errno c)
- (clsql-sql-error-error c)))))
-
-(define-condition clsql-database-warning (clsql-warning)
- ((database :initarg :database :reader clsql-database-warning-database)
- (message :initarg :message :reader clsql-database-warning-message))
- (:report (lambda (c stream)
- (format stream "While accessing database ~A~% Warning: ~A~% has occurred."
- (clsql-database-warning-database c)
- (clsql-database-warning-message c)))))
-
-(define-condition clsql-exists-condition (clsql-condition)
- ((old-db :initarg :old-db :reader clsql-exists-condition-old-db)
- (new-db :initarg :new-db :reader clsql-exists-condition-new-db
- :initform nil))
- (:report (lambda (c stream)
- (format stream "In call to ~S:~%" 'connect)
- (cond
- ((null (clsql-exists-condition-new-db c))
- (format stream
- " There is an existing connection ~A to database ~A."
- (clsql-exists-condition-old-db c)
- (database-name (clsql-exists-condition-old-db c))))
- ((eq (clsql-exists-condition-new-db c)
- (clsql-exists-condition-old-db c))
- (format stream
- " Using existing connection ~A to database ~A."
- (clsql-exists-condition-old-db c)
- (database-name (clsql-exists-condition-old-db c))))
- (t
- (format stream
- " Created new connection ~A to database ~A~% ~
-although there is an existing connection (~A)."
- (clsql-exists-condition-new-db c)
- (database-name (clsql-exists-condition-new-db c))
- (clsql-exists-condition-old-db c)))))))
-
-(define-condition clsql-exists-warning (clsql-exists-condition
- clsql-warning)
- ())
-
-(define-condition clsql-exists-error (clsql-exists-condition
- clsql-error)
- ())
-
-(define-condition clsql-closed-error (clsql-error)
- ((database :initarg :database :reader clsql-closed-error-database))
- (:report (lambda (c stream)
- (format stream "The database ~A has already been closed."
- (clsql-closed-error-database c)))))
;;; Database Types
(defvar *loaded-database-types* nil
"Contains a list of database types which have been defined/loaded.")
+(defmethod database-type-load-foreign :after (database-type)
+ (when (database-type-library-loaded database-type)
+ (pushnew database-type *loaded-database-types*)))
+
(defun reload-database-types ()
"Reloads any foreign code for the loaded database types after a dump."
(mapc #'database-type-load-foreign *loaded-database-types*))
-(defgeneric database-type-load-foreign (database-type)
- (:documentation
- "The internal generic implementation of reload-database-types.")
- (:method :after (database-type)
- (pushnew database-type *loaded-database-types*)))
-
-(defgeneric database-type-library-loaded (database-type)
- (:documentation
- "The internal generic implementation for checking if
-database type library loaded successfully."))
-
(defvar *default-database-type* nil
"Specifies the default type of database. Currently only :mysql is
supported.")
(push database-type *initialized-database-types*)
t)))
-(defgeneric database-initialize-database-type (database-type)
- (:documentation
- "The internal generic implementation of initialize-database-type."))
;;; Database handling
(defvar *default-database* nil
"Specifies the default database to be used.")
-(defclass database ()
- ((name :initarg :name :reader database-name))
- (:documentation
- "This class is the supertype of all databases handled by CLSQL."))
-
-(defmethod print-object ((object database) stream)
- (print-unreadable-object (object stream :type t :identity t)
- (write-string (if (slot-boundp object 'name)
- (database-name object)
- "<unbound>")
- stream)))
-
-(defclass closed-database ()
- ((name :initarg :name :reader database-name))
- (:documentation
- "This class represents all databases after they are closed via
-`disconnect'."))
-
-(defmethod print-object ((object closed-database) stream)
- (print-unreadable-object (object stream :type t :identity t)
- (write-string (if (slot-boundp object 'name)
- (database-name object)
- "<unbound>")
- stream)))
-
-(defun signal-closed-database-error (database)
- (cerror "Ignore this error and return nil."
- 'clsql-closed-error
- :database database))
+
(defun find-database (database &optional (errorp t))
(etypecase database
(defun connect (connection-spec
&key (if-exists *connect-if-exists*)
- (database-type *default-database-type*))
+ (database-type *default-database-type*)
+ (pool nil))
"Connects to a database of the given database-type, using the type-specific
connection-spec. if-exists is currently ignored."
(let* ((db-name (database-name-from-spec connection-spec database-type))
(old-db (find-database db-name nil))
(result nil))
- (if old-db
- (case if-exists
- (:new
- (setq result
- (database-connect connection-spec database-type)))
- (:warn-new
- (setq result
- (database-connect connection-spec database-type))
- (warn 'clsql-exists-warning :old-db old-db :new-db result))
- (:error
- (restart-case
- (error 'clsql-exists-error :old-db old-db)
- (create-new ()
- :report "Create a new connection."
- (setq result
- (database-connect connection-spec database-type)))
- (use-old ()
- :report "Use the existing connection."
- (setq result old-db))))
- (:warn-old
- (setq result old-db)
- (warn 'clsql-exists-warning :old-db old-db :new-db old-db))
- (:old
- (setq result old-db)))
+ (if pool
+ (setq result (acquire-from-pool connection-spec database-type))
+ (if old-db
+ (case if-exists
+ (:new
+ (setq result
+ (database-connect connection-spec database-type)))
+ (:warn-new
+ (setq result
+ (database-connect connection-spec database-type))
+ (warn 'clsql-exists-warning :old-db old-db :new-db result))
+ (:error
+ (restart-case
+ (error 'clsql-exists-error :old-db old-db)
+ (create-new ()
+ :report "Create a new connection."
+ (setq result
+ (database-connect connection-spec database-type)))
+ (use-old ()
+ :report "Use the existing connection."
+ (setq result old-db))))
+ (:warn-old
+ (setq result old-db)
+ (warn 'clsql-exists-warning :old-db old-db :new-db old-db))
+ (:old
+ (setq result old-db)))
(setq result
- (database-connect connection-spec database-type)))
+ (database-connect connection-spec database-type))))
(when result
(pushnew result *connected-databases*)
(setq *default-database* result)
result)))
-(defgeneric database-name-from-spec (connection-spec database-type)
- (:documentation
- "Returns the name of the database that would be created if connect
-was called with the connection-spec."))
-
-(defgeneric database-connect (connection-spec database-type)
- (:documentation "Internal generic implementation of connect."))
-(defun disconnect (&key (database *default-database*))
+(defun disconnect (&key (database *default-database*)
+ (pool nil))
"Closes the connection to database. Resets *default-database* if that
database was disconnected and only one other connection exists."
- (when (database-disconnect database)
- (setq *connected-databases* (delete database *connected-databases*))
- (when (eq database *default-database*)
- (setq *default-database* (car *connected-databases*)))
- (change-class database 'closed-database)
- t))
-
-(defgeneric database-disconnect (database)
- (:method ((database closed-database))
- (signal-closed-database-error database))
- (:documentation "Internal generic implementation of disconnect."))
+ (if pool
+ (release-to-pool database)
+ (when (database-disconnect database)
+ (setq *connected-databases* (delete database *connected-databases*))
+ (when (eq database *default-database*)
+ (setq *default-database* (car *connected-databases*)))
+ (change-class database 'closed-database)
+ t)))
;;; Basic operations on databases
Returns a list of lists of values of the result of that expression."
(database-query query-expression database types))
-(defgeneric database-query (query-expression database types)
- (:method (query-expression (database closed-database) types)
- (declare (ignore query-expression types))
- (signal-closed-database-error database))
- (:documentation "Internal generic implementation of query."))
+
(defmethod execute-command (sql-expression &key (database *default-database*))
"Execute the SQL command expression sql-expression on the given database.
Returns true on success or nil on failure."
(database-execute-command sql-expression database))
-(defgeneric database-execute-command (sql-expression database)
- (:method (sql-expression (database closed-database))
- (declare (ignore sql-expression))
- (signal-closed-database-error database))
- (:documentation "Internal generic implementation of execute-command."))
-
-;;; Mapping and iteration
-(defgeneric database-query-result-set
- (query-expression database &key full-set types)
- (:method (query-expression (database closed-database) &key full-set types)
- (declare (ignore query-expression full-set types))
- (signal-closed-database-error database)
- (values nil nil nil))
- (:documentation
- "Internal generic implementation of query mapping. Starts the
-query specified by query-expression on the given database and returns
-a result-set to be used with database-store-next-row and
-database-dump-result-set to access the returned data. The second
-value is the number of columns in the result-set, if there are any.
-If full-set is true, the number of rows in the result-set is returned
-as a third value, if this is possible (otherwise nil is returned for
-the third value). This might have memory and resource usage
-implications, since many databases will require the query to be
-executed in full to answer this question. If the query produced no
-results then nil is returned for all values that would have been
-returned otherwise. If an error occurs during query execution, the
-function should signal a clsql-sql-error."))
-
-(defgeneric database-dump-result-set (result-set database)
- (:method (result-set (database closed-database))
- (declare (ignore result-set))
- (signal-closed-database-error database))
- (:documentation "Dumps the received result-set."))
-
-(defgeneric database-store-next-row (result-set database list)
- (:method (result-set (database closed-database) list)
- (declare (ignore result-set list))
- (signal-closed-database-error database))
- (:documentation
- "Returns t and stores the next row in the result set in list or
-returns nil when result-set is finished."))
-
(defun map-query (output-type-spec function query-expression
,@body))
(database-dump-result-set ,result-set ,db)))))))
+;;; Marc Battyani : Large objects support
+
+(defun create-large-object (&key (database *default-database*))
+ "Creates a new large object in the database and returns the object identifier"
+ (database-create-large-object database))
+
+(defun write-large-object (object-id data &key (database *default-database*))
+ "Writes data to the large object"
+ (database-write-large-object object-id data database))
+(defun read-large-object (object-id &key (database *default-database*))
+ "Reads the large object content"
+ (database-read-large-object object-id database))
+(defun delete-large-object (object-id &key (database *default-database*))
+ "Deletes the large object in the database"
+ (database-delete-large-object object-id database))