;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
-;;;; Name: sql.cl
+;;;; Name: sql.lisp
;;;; Purpose: High-level SQL interface
;;;; Authors: Kevin M. Rosenberg based on code by Pierre R. Mai
;;;; Date Started: Feb 2002
;;;;
-;;;; $Id: sql.lisp,v 1.5 2003/05/06 02:27:08 kevin Exp $
+;;;; $Id$
;;;;
-;;;; This file, part of CLSQL, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;; This file, part of CLSQL, is Copyright (c) 2002-2004 by Kevin M. Rosenberg
;;;; and Copyright (c) 1999-2001 by Pierre R. Mai
;;;;
;;;; CLSQL users are granted the rights to distribute and use this software
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
-(eval-when (:compile-toplevel)
- (declaim (optimize (debug 3) (speed 3) (safety 1) (compilation-speed 0))))
-
(in-package #:clsql-sys)
-;;; Database handling
-
-(defvar *connect-if-exists* :error
- "Default value for the if-exists parameter of connect calls.")
-
-(defvar *connected-databases* nil
- "List of active database objects.")
-
-(defun connected-databases ()
- "Return the list of active database objects."
- *connected-databases*)
-
-(defvar *default-database* nil
- "Specifies the default database to be used.")
-
-(defun find-database (database &optional (errorp t))
- (etypecase database
- (database
- ;; Return the database object itself
- database)
- (string
- (or (find database (connected-databases)
- :key #'database-name
- :test #'string=)
- (when errorp
- (cerror "Return nil."
- 'clsql-simple-error
- :format-control "There exists no database called ~A."
- :format-arguments (list database)))))))
-
-(defun connect (connection-spec
- &key (if-exists *connect-if-exists*)
- (database-type *default-database-type*)
- (pool nil))
- "Connects to a database of the given database-type, using the type-specific
-connection-spec.
-If pool is t the connection will be taken from the general pool,
-if pool is a conn-pool object the connection will be taken from this pool.
-"
- (if pool
- (acquire-from-pool connection-spec database-type pool)
- (let* ((db-name (database-name-from-spec connection-spec database-type))
- (old-db (unless (eq if-exists :new) (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)))
- (setq result
- (database-connect connection-spec database-type)))
- (when result
- (pushnew result *connected-databases*)
- (setq *default-database* result)
- result))))
-
-
-(defun disconnect (&key (database *default-database*))
- "Closes the connection to database. Resets *default-database* if that
-database was disconnected and only one other connection exists.
-if the database is from a pool it will be released to this pool."
- (if (conn-pool database)
- (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
-
-(defgeneric query (expression &key database types))
-(defmethod query (query-expression &key (database *default-database*)
- types)
- "Execute the SQL query expression query-expression on the given database.
-Returns a list of lists of values of the result of that expression."
- (database-query query-expression database types))
+;;; Row processing macro
+
+(defmacro for-each-row (((&rest fields) &key from order-by where distinct limit) &body body)
+ (let ((d (gensym "DISTINCT-"))
+ (bind-fields (loop for f in fields collect (car f)))
+ (w (gensym "WHERE-"))
+ (o (gensym "ORDER-BY-"))
+ (frm (gensym "FROM-"))
+ (l (gensym "LIMIT-"))
+ (q (gensym "QUERY-")))
+ `(let ((,frm ,from)
+ (,w ,where)
+ (,d ,distinct)
+ (,l ,limit)
+ (,o ,order-by))
+ (let ((,q (query-string ',fields ,frm ,w ,d ,o ,l)))
+ (loop for tuple in (query ,q)
+ collect (destructuring-bind ,bind-fields tuple
+ ,@body))))))
+
+(defun query-string (fields from where distinct order-by limit)
+ (concatenate
+ 'string
+ (format nil "select ~A~{~A~^,~} from ~{~A~^ and ~}"
+ (if distinct "distinct " "") (field-names fields)
+ (from-names from))
+ (if where (format nil " where ~{~A~^ ~}"
+ (where-strings where)) "")
+ (if order-by (format nil " order by ~{~A~^, ~}"
+ (order-by-strings order-by)))
+ (if limit (format nil " limit ~D" limit) "")))
+
+(defun lisp->sql-name (field)
+ (typecase field
+ (string field)
+ (symbol (string-upcase (symbol-name field)))
+ (cons (cadr field))
+ (t (format nil "~A" field))))
+
+(defun field-names (field-forms)
+ "Return a list of field name strings from a fields form"
+ (loop for field-form in field-forms
+ collect
+ (lisp->sql-name
+ (if (cadr field-form)
+ (cadr field-form)
+ (car field-form)))))
+
+(defun from-names (from)
+ "Return a list of field name strings from a fields form"
+ (loop for table in (if (atom from) (list from) from)
+ collect (lisp->sql-name table)))
+
+
+(defun where-strings (where)
+ (loop for w in (if (atom (car where)) (list where) where)
+ collect
+ (if (consp w)
+ (format nil "~A ~A ~A" (second w) (first w) (third w))
+ (format nil "~A" w))))
+
+(defun order-by-strings (order-by)
+ (loop for o in order-by
+ collect
+ (if (atom o)
+ (lisp->sql-name o)
+ (format nil "~A ~A" (lisp->sql-name (car o))
+ (lisp->sql-name (cadr o))))))
-(defgeneric execute-command (expression &key database))
-(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))
-
-
-
-(defun map-query (output-type-spec function query-expression
- &key (database *default-database*)
- (types nil))
- "Map the function over all tuples that are returned by the query in
-query-expression. The results of the function are collected as
-specified in output-type-spec and returned like in MAP."
- ;; DANGER Will Robinson: Parts of the code for implementing
- ;; map-query (including the code below and the helper functions
- ;; called) are highly CMU CL specific.
- ;; KMR -- these have been replaced with cross-platform instructions above
- (macrolet ((type-specifier-atom (type)
- `(if (atom ,type) ,type (car ,type))))
- (case (type-specifier-atom output-type-spec)
- ((nil)
- (map-query-for-effect function query-expression database types))
- (list
- (map-query-to-list function query-expression database types))
- ((simple-vector simple-string vector string array simple-array
- bit-vector simple-bit-vector base-string
- simple-base-string)
- (map-query-to-simple output-type-spec function query-expression database types))
- (t
- (funcall #'map-query (cmucl-compat:result-type-or-lose output-type-spec t)
- function query-expression :database database :types types)))))
-
-(defun map-query-for-effect (function query-expression database types)
- (multiple-value-bind (result-set columns)
- (database-query-result-set query-expression database :full-set nil
- :types types)
- (when result-set
- (unwind-protect
- (do ((row (make-list columns)))
- ((not (database-store-next-row result-set database row))
- nil)
- (apply function row))
- (database-dump-result-set result-set database)))))
-
-(defun map-query-to-list (function query-expression database types)
- (multiple-value-bind (result-set columns)
- (database-query-result-set query-expression database :full-set nil
- :types types)
- (when result-set
- (unwind-protect
- (let ((result (list nil)))
- (do ((row (make-list columns))
- (current-cons result (cdr current-cons)))
- ((not (database-store-next-row result-set database row))
- (cdr result))
- (rplacd current-cons (list (apply function row)))))
- (database-dump-result-set result-set database)))))
-
-
-(defun map-query-to-simple (output-type-spec function query-expression database types)
- (multiple-value-bind (result-set columns rows)
- (database-query-result-set query-expression database :full-set t
- :types types)
- (when result-set
- (unwind-protect
- (if rows
- ;; We know the row count in advance, so we allocate once
- (do ((result
- (cmucl-compat:make-sequence-of-type output-type-spec rows))
- (row (make-list columns))
- (index 0 (1+ index)))
- ((not (database-store-next-row result-set database row))
- result)
- (declare (fixnum index))
- (setf (aref result index)
- (apply function row)))
- ;; Database can't report row count in advance, so we have
- ;; to grow and shrink our vector dynamically
- (do ((result
- (cmucl-compat:make-sequence-of-type output-type-spec 100))
- (allocated-length 100)
- (row (make-list columns))
- (index 0 (1+ index)))
- ((not (database-store-next-row result-set database row))
- (cmucl-compat:shrink-vector result index))
- (declare (fixnum allocated-length index))
- (when (>= index allocated-length)
- (setq allocated-length (* allocated-length 2)
- result (adjust-array result allocated-length)))
- (setf (aref result index)
- (apply function row))))
- (database-dump-result-set result-set database)))))
-
-(defmacro do-query (((&rest args) query-expression
- &key (database '*default-database*)
- (types nil))
- &body body)
- (let ((result-set (gensym))
- (columns (gensym))
- (row (gensym))
- (db (gensym)))
- `(let ((,db ,database))
- (multiple-value-bind (,result-set ,columns)
- (database-query-result-set ,query-expression ,db
- :full-set nil :types ,types)
- (when ,result-set
- (unwind-protect
- (do ((,row (make-list ,columns)))
- ((not (database-store-next-row ,result-set ,db ,row))
- nil)
- (destructuring-bind ,args ,row
- ,@body))
- (database-dump-result-set ,result-set ,db)))))))
-
;;; Marc Battyani : Large objects support
(defun create-large-object (&key (database *default-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))
+
+
projects / clsql.git / blobdiff