1 (in-package :meta-model
)
3 (eval-when (:compile-toplevel
:load-toplevel
:execute
)
6 (export 'def-meta-model-from-table
)
7 (export 'def-meta-models
)
8 (export 'def-view-class
/meta
)
9 (export 'list-base-classes
)
13 (defmethod sync-instance ((view clsql
:standard-db-object
) &key
(database *default-database
*))
14 (labels ((sym->sql
(sym) (string-downcase (substitute #\_
#\-
(string sym
))))
15 (get-def (slot) (caar (query
16 (format nil
"SELECT DISTINCT adsrc from pg_attrdef join pg_attribute on attnum = adnum where adrelid = (select oid from pg_class where relname = '~A') and attname = '~A'" (sym->sql
(class-name (class-of view
))) (sym->sql slot
)))))
17 (get-default-value (slot)
18 (let ((def (get-def slot
)))
20 (caar (query (format nil
"SELECT ~A" def
)))
21 (error "No default value for primary key : ~A" slot
)))))
23 (dolist (slot (list-slots view
))
24 (when (and (primary-key-p view slot
)
25 (or (not (slot-boundp view slot
))
26 (equal (slot-value view slot
) nil
)))
27 (setf (slot-value view slot
) (get-default-value slot
)))))
28 (update-records-from-instance view
:database database
)
29 (update-instance-from-records view
:database database
)
30 (update-objects-joins (list view
)))
34 (defparameter *clsql-base-classes
* (list) )
36 (defmethod list-base-classes ((type (eql :clsql
)))
39 (defmethod def-base-class-expander ((model meta-model-class
) (base-type (eql :clsql
)) (name t
) (args t
))
40 `(def-view-class ,name
()
41 ,(meta-model.metadata model
)))
43 (defmethod def-base-class-expander :after
((model meta-model-class
) (base-type (eql :clsql
)) (name t
) (args t
))
44 (unless (member name
*clsql-base-classes
*)
45 (setf *clsql-base-classes
* (cons name
*clsql-base-classes
*))))
47 (defparameter *sql-type-map
* '((:INT4 integer
) (:TEXT string
) (:VARCHAR string
) (:TIMESTAMP clsql-sys
::wall-time
) (:NUMERIC number
)(:BYTEA string
)))
49 (defun gen-type (table column
)
53 (list-attribute-types table
)
57 (defun sql->sym
(name &optional
(package nil
))
59 (string-upcase (substitute #\-
#\_ x
))))
61 (intern (xform (string name
)) package
)
62 (intern (xform (string name
))))))
64 (defun table->slots
(table pkey
)
68 :accessor
,(sql->sym col
)
69 :initarg
,(sql->sym col
"KEYWORD")
70 :type
,(gen-type table col
)
72 ,(if (equalp col pkey
)
75 (list-attributes table
)))
77 (defun view-class-definition-list ()
78 (mapcar #'(lambda (x) `(def-meta-model-from-table ,x
))
81 (defmacro def-meta-models
()
82 (let ((defs (view-class-definition-list)))
88 (dolist (row (get-pkeys-query))
89 (setf keys
(acons (car row
) (list (cadr row
)) keys
)))
92 (defun get-pkeys-query()
94 "SELECT pg_class.relname, pg_attribute.attname, pg_catalog.quote_ident(conname) AS constraint_n
95 , pg_catalog.pg_get_indexdef(d.objid) AS constraint_definition
97 WHEN contype = 'p' THEN
101 END as constraint_type
103 pg_class, pg_attribute,
104 pg_catalog.pg_constraint AS c
105 JOIN pg_catalog.pg_depend AS d ON (d.refobjid = c.oid)
106 WHERE contype IN ('p', 'u')
108 and conrelid = pg_class.oid
109 and pg_attribute.attnum = ANY (c.conkey)
110 and pg_attribute.attrelid = pg_class.oid"))
112 ;;here is how this works
113 ;;from the postgres system tables we get
114 ;;list of all the has-a relationships.
115 ;;the inverse of a has-a is an implicit has-many
116 ;;and any relation having more than one foreign key
117 ;;is a join table hosting a many-to-many relationship
119 (defun get-fkey-explosions ()
120 (let ((key-table (get-fkey-explosions-query))
122 (dolist (row key-table
)
123 (setf row
(mapcar #'(lambda (x)
126 ;;this one does the has-a
127 (setf keys
(acons (car row
) (gen-has-a row
)
129 ;;the inverse of the previous represents a has-many.
131 (acons (fourth row
) (gen-has-many row
)
136 (remove-if #'(lambda (r) (or (not (equal (car row
) (car r
)))
137 (equal (last row
) (last r
))))
138 (mapcar #'(lambda (x)
139 (mapcar #'sql-
>sym x
))
141 (setf keys
(acons (fourth row
)
142 (gen-many-to-many mrow
(third row
) (second row
))
147 (defun get-fkey-explosions-query ()
148 ;;these query's are a mess, i don't even know how they work :)
150 SELECT pg_class.relname,
151 pg_attribute.attname,
159 WHERE pg_class.relname in (select tablename from pg_tables where schemaname = 'public')
160 AND pg_class.oid = pg_constraint.conrelid
161 AND pg_attribute.attnum = ANY (pg_constraint.conkey)
162 AND pg_attribute.attrelid = pg_class.oid
163 AND f.oid = confrelid
164 AND fa.attrelid = f.oid
165 AND fa.attnum = ANY (pg_constraint.confkey)"))
168 ;; i chose keyword args here so as to make the code more understandable.
169 ;; it didn't really work.
170 (defun gen-join-slot (&key name home-key foreign-key join-class
(set nil
))
172 :accessor
,(intern name
)
174 :db-info
(:join-class
,join-class
176 :foreign-key
,foreign-key
179 (defun gen-has-a (row)
182 (format nil
"~A->~A" (string (car row
))(string (second row
)))
183 :home-key
(second row
)
184 :foreign-key
(third row
)
185 :join-class
(fourth row
)))
187 (defun gen-has-many (row)
190 (format nil
"~A->~A" (string (car row
))(string (second row
)))
191 :home-key
(third row
)
192 :foreign-key
(second row
)
193 :join-class
(car row
)
196 (defun gen-many-to-many (row home-key foreign-key
)
197 (let ((name (sql->sym
(string-upcase (format nil
"~A->~A" (string (car row
)) (string (second row
)))))))
198 (setf row
(mapcar #'sql-
>sym row
))
202 :db-info
(:join-class
,(car row
)
204 :foreign-key
,foreign-key
208 (defmacro def-view-class
/meta
(name supers slots
&rest args
)
210 (let* ((m (def-meta-model model-name
,supers
,slots
,args
))
211 (i (make-instance m
)))
212 (prog1 (eval (def-base-class-expander i
:clsql
',name
',args
))
213 (defmethod meta-model.metadata
((self ,name
))
214 (meta-model.metadata i
))))))
217 (defmacro def-view-class
/table
(table &optional name
)
218 "takes the name of a table as a string and
219 creates a clsql view-class"
220 (let* ((pkey (cadr (assoc table
(get-pkeys) :test
#'equalp
)))
221 (table-slots (table->slots table pkey
))
224 (dolist (exp (get-fkey-explosions))
225 (when (equalp (car exp
) (sql->sym table
))
226 (setf slots
(cons (cdr exp
) slots
))))
228 `(def-view-class/meta
,(if name name
(sql->sym table
))
230 ,(append table-slots join-slots
))))