1 ;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
2 ;;;; *************************************************************************
5 (in-package #:clsql-base-sys)
9 (defgeneric query (query-expression &key database result-types flatp)
11 "Execute the SQL query expression QUERY-EXPRESSION on the given
12 DATABASE which defaults to *default-database*. RESULT-TYPES is a list
13 of symbols such as :string and :integer, one for each field in the
14 query, which are used to specify the types to return. The FLATP
15 argument, which has a default value of nil, specifies if full
16 bracketed results should be returned for each matched entry. If FLATP
17 is nil, the results are returned as a list of lists. If FLATP is t,
18 the results are returned as elements of a list, only if there is only
19 one result per row. Returns a list of lists of values of the result of
20 that expression and a list of field names selected in sql-exp."))
22 (defmethod query ((query-expression string) &key (database *default-database*)
23 (result-types nil) (flatp nil))
24 (record-sql-command query-expression database)
25 (let* ((res (database-query query-expression database result-types))
26 (res (if (and flatp (= (length
27 (slot-value query-expression 'selections))
31 (record-sql-result res database)
36 (defgeneric execute-command (expression &key database)
38 "Executes the SQL command specified by EXPRESSION for the database
39 specified by DATABASE, which has a default value of
40 *DEFAULT-DATABASE*. The argument EXPRESSION may be any SQL statement
41 other than a query. To run a stored procedure, pass an appropriate
42 string. The call to the procedure needs to be wrapped in a BEGIN END
45 (defmethod execute-command ((sql-expression string)
46 &key (database *default-database*))
47 (record-sql-command sql-expression database)
48 (let ((res (database-execute-command sql-expression database)))
49 (record-sql-result res database))
53 (defmacro do-query (((&rest args) query-expression
54 &key (database '*default-database*) (types nil))
56 "Repeatedly executes BODY within a binding of ARGS on the attributes
57 of each record resulting from QUERY. The return value is determined by
58 the result of executing BODY. The default value of DATABASE is
60 (let ((result-set (gensym))
64 `(let ((,db ,database))
65 (multiple-value-bind (,result-set ,columns)
66 (database-query-result-set ,query-expression ,db
67 :full-set nil :types ,types)
70 (do ((,row (make-list ,columns)))
71 ((not (database-store-next-row ,result-set ,db ,row))
73 (destructuring-bind ,args ,row
75 (database-dump-result-set ,result-set ,db)))))))
77 (defun map-query (output-type-spec function query-expression
78 &key (database *default-database*)
80 "Map the function over all tuples that are returned by the query in
81 query-expression. The results of the function are collected as
82 specified in output-type-spec and returned like in MAP."
83 (macrolet ((type-specifier-atom (type)
84 `(if (atom ,type) ,type (car ,type))))
85 (case (type-specifier-atom output-type-spec)
87 (map-query-for-effect function query-expression database types))
89 (map-query-to-list function query-expression database types))
90 ((simple-vector simple-string vector string array simple-array
91 bit-vector simple-bit-vector base-string
93 (map-query-to-simple output-type-spec function query-expression database types))
95 (funcall #'map-query (cmucl-compat:result-type-or-lose output-type-spec t)
96 function query-expression :database database :types types)))))
98 (defun map-query-for-effect (function query-expression database types)
99 (multiple-value-bind (result-set columns)
100 (database-query-result-set query-expression database :full-set nil
104 (do ((row (make-list columns)))
105 ((not (database-store-next-row result-set database row))
107 (apply function row))
108 (database-dump-result-set result-set database)))))
110 (defun map-query-to-list (function query-expression database types)
111 (multiple-value-bind (result-set columns)
112 (database-query-result-set query-expression database :full-set nil
116 (let ((result (list nil)))
117 (do ((row (make-list columns))
118 (current-cons result (cdr current-cons)))
119 ((not (database-store-next-row result-set database row))
121 (rplacd current-cons (list (apply function row)))))
122 (database-dump-result-set result-set database)))))
125 (defun map-query-to-simple (output-type-spec function query-expression database types)
126 (multiple-value-bind (result-set columns rows)
127 (database-query-result-set query-expression database :full-set t
132 ;; We know the row count in advance, so we allocate once
134 (cmucl-compat:make-sequence-of-type output-type-spec rows))
135 (row (make-list columns))
136 (index 0 (1+ index)))
137 ((not (database-store-next-row result-set database row))
139 (declare (fixnum index))
140 (setf (aref result index)
141 (apply function row)))
142 ;; Database can't report row count in advance, so we have
143 ;; to grow and shrink our vector dynamically
145 (cmucl-compat:make-sequence-of-type output-type-spec 100))
146 (allocated-length 100)
147 (row (make-list columns))
148 (index 0 (1+ index)))
149 ((not (database-store-next-row result-set database row))
150 (cmucl-compat:shrink-vector result index))
151 (declare (fixnum allocated-length index))
152 (when (>= index allocated-length)
153 (setq allocated-length (* allocated-length 2)
154 result (adjust-array result allocated-length)))
155 (setf (aref result index)
156 (apply function row))))
157 (database-dump-result-set result-set database)))))