;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
;;;; *************************************************************************
;;;;
-;;;; $Id$
-;;;;
;;;; Generic ODBC layer, used by db-odbc and db-aodbc backends
;;;;
;;;; This file is part of CLSQL.
(in-package #:clsql-sys)
(defclass generic-odbc-database (database)
- ()
+ ((dbi-package :initarg :dbi-package :reader dbi-package)
+ (odbc-conn :initarg :odbc-conn :initform nil :accessor odbc-conn)
+ (disconnect-fn :reader disconnect-fn)
+ (sql-fn :reader sql-fn)
+ (close-query-fn :reader close-query-fn)
+ (fetch-row :reader fetch-row-fn)
+ (list-all-database-tables-fn :reader list-all-database-tables-fn)
+ (list-all-table-columns-fn :reader list-all-table-columns-fn))
(:documentation "Encapsulate same behavior across odbc and aodbc backends."))
+(defmethod initialize-instance :after ((db generic-odbc-database)
+ &rest all-keys)
+ (declare (ignore all-keys))
+ (unless (slot-boundp db 'dbi-package)
+ (error "dbi-package not specified."))
+ (let ((pkg (slot-value db 'dbi-package)))
+ (unless pkg
+ (error "dbi-package is nil."))
+ (setf (slot-value db 'disconnect-fn)
+ (intern (symbol-name '#:disconnect) pkg)
+ (slot-value db 'sql-fn)
+ (intern (symbol-name '#:sql) pkg)
+ (slot-value db 'close-query-fn)
+ (intern (symbol-name '#:close-query) pkg)
+ (slot-value db 'fetch-row)
+ (intern (symbol-name '#:fetch-row) pkg)
+ (slot-value db 'list-all-database-tables-fn)
+ (intern (symbol-name '#:list-all-database-tables) pkg)
+ (slot-value db 'list-all-table-columns-fn)
+ (intern (symbol-name '#:list-all-table-columns) pkg))))
+
+;;; Object methods
+
(defmethod read-sql-value (val (type (eql 'boolean))
- (database generic-odbc-database)
- (db-type (eql :postgresql)))
+ (database generic-odbc-database)
+ (db-type (eql :postgresql)))
+ (if (string= "0" val) nil t))
+
+(defmethod read-sql-value (val (type (eql 'generalized-boolean))
+ (database generic-odbc-database)
+ (db-type (eql :postgresql)))
(if (string= "0" val) nil t))
+(defmethod read-sql-value (val (type (eql 'boolean)) database
+ (db-type (eql :mssql)))
+ (declare (ignore database))
+ (etypecase val
+ (string (if (string= "0" val) nil t))
+ (integer (if (zerop val) nil t))))
+
+(defmethod read-sql-value (val (type (eql 'generalized-boolean)) database
+ (db-type (eql :mssql)))
+ (declare (ignore database))
+ (etypecase val
+ (string (if (string= "0" val) nil t))
+ (integer (if (zerop val) nil t))))
+
+;;; Type methods
+
+(defmethod database-get-type-specifier ((type symbol) args database
+ (db-type (eql :mssql)))
+ "Special database types for MSSQL backends"
+ (declare (ignore database db-type args))
+ (case type
+ (wall-time "DATETIME")
+ (date "SMALLDATETIME")
+ ((generalized-boolean boolean) "BIT")
+ ((longchar text) "ntext")
+ ((varchar string)
+ (if args
+ (format nil "NVARCHAR(~A)" (car args))
+ (format nil "NVARCHAR(~D)" *default-string-length*)))
+ (t (call-next-method))))
+
+;;; Generation of SQL strings from lisp expressions
+
+(defmethod database-output-sql ((tee (eql t)) (database generic-odbc-database))
+ (case (database-underlying-type database)
+ (:mssql "1")
+ (t "'Y'")))
+
+;;; Database backend capabilities
+
+(defmethod db-type-use-fully-qualified-column-on-drop-index? ((db-type (eql :mssql)))
+ t)
+
+(defmethod db-type-has-boolean-where? ((db-type (eql :mssql)))
+ nil)
+
+(defmethod db-type-has-intersect? ((db-type (eql :mssql)))
+ nil)
+
+(defmethod db-type-has-except? ((db-type (eql :mssql)))
+ nil)
+
+;;; Backend methods
+
+(defmethod database-disconnect ((database generic-odbc-database))
+ (funcall (disconnect-fn database) (odbc-conn database))
+ (setf (odbc-conn database) nil)
+ t)
+
+(defmethod database-query (query-expression (database generic-odbc-database)
+ result-types field-names)
+ (handler-case
+ (funcall (sql-fn database)
+ query-expression :db (odbc-conn database)
+ :result-types result-types
+ :column-names field-names)
+ #+ignore
+ (error ()
+ (error 'sql-database-data-error
+ :database database
+ :expression query-expression
+ :message "Query failed"))))
+
+
+(defmethod database-execute-command (sql-expression (database generic-odbc-database))
+ (handler-case
+ (funcall (sql-fn database)
+ sql-expression :db (odbc-conn database))
+ #+ignore
+ (sql-error (e)
+ (error e))
+ #+ignore
+ (error ()
+ (error 'sql-database-data-error
+ :database database
+ :expression sql-expression
+ :message "Execute command failed"))))
+
+
+(defstruct odbc-result-set
+ (query nil)
+ (types nil)
+ (full-set nil :type boolean))
+
+
+
+
+(defmethod database-query-result-set ((query-expression string)
+ (database generic-odbc-database)
+ &key full-set result-types)
+ (handler-case
+ (multiple-value-bind (query column-names)
+ (funcall (sql-fn database)
+ query-expression
+ :db (odbc-conn database)
+ :row-count nil
+ :column-names t
+ :query t
+ :result-types result-types)
+ (values
+ (make-odbc-result-set :query query :full-set full-set
+ :types result-types)
+ (length column-names)
+ nil ;; not able to return number of rows with odbc
+ ))
+ (error ()
+ (error 'sql-database-data-error
+ :database database
+ :expression query-expression
+ :message "Query result set failed"))))
+
+(defmethod database-dump-result-set (result-set (database generic-odbc-database))
+ (funcall (close-query-fn database) (odbc-result-set-query result-set))
+ t)
+
+(defmethod database-store-next-row (result-set
+ (database generic-odbc-database)
+ list)
+ (let ((row (funcall (fetch-row-fn database)
+ (odbc-result-set-query result-set) nil 'eof)))
+ (if (eq row 'eof)
+ nil
+ (progn
+ (loop for elem in row
+ for rest on list
+ do
+ (setf (car rest) elem))
+ list))))
+
+
+(defun %database-list-* (database type owner)
+ "Internal function used by database-list-tables and
+database-list-views"
+ (multiple-value-bind (rows col-names)
+ (funcall (list-all-database-tables-fn database) :db (odbc-conn database))
+ (declare (ignore col-names))
+ ;; http://msdn.microsoft.com/en-us/library/ms711831%28VS.85%29.aspx
+ ;; TABLE_SCHEM is hard-coded in second column by ODBC Driver Manager
+ ;; TABLE_NAME in third column, TABLE_TYPE in fourth column
+ (loop for (category schema name ttype . rest) in rows
+ when (and (string-equal type ttype)
+ (or (null owner) (string-equal owner schema))
+ ;; unless requesting by name, skip system schema
+ (not (and (null owner)
+ (member schema '("information_schema" "sys")
+ :test #'string-equal)))
+ ;; skip system specific tables in mssql2000
+ (not (and (eql :mssql (database-underlying-type database))
+ (member name '("dtproperties" "sysconstraints"
+ "syssegments")
+ :test #'string-equal))))
+ collect name)))
+
+(defmethod database-list-tables ((database generic-odbc-database)
+ &key (owner nil))
+ "Since ODBC doesn't expose the owner we use that parameter to filter
+on schema since that's what tends to be exposed. Some DBs like mssql
+2000 conflate the two so at least there it works nicely."
+ (%database-list-* database "TABLE" owner))
+
+
+(defmethod database-list-views ((database generic-odbc-database)
+ &key (owner nil))
+ "Since ODBC doesn't expose the owner we use that parameter to filter
+on schema since that's what tends to be exposed. Some DBs like mssql
+2000 conflate the two so at least there it works nicely."
+ (%database-list-* database "VIEW" owner))
+
+
+(defmethod database-list-attributes ((table %database-identifier) (database generic-odbc-database)
+ &key (owner nil)
+ &aux (table (unescaped-database-identifier table)))
+ (declare (ignore owner))
+ (multiple-value-bind (rows col-names)
+ (funcall (list-all-table-columns-fn database) table
+ :db (odbc-conn database))
+ (declare (ignore col-names))
+ ;; COLUMN_NAME is hard-coded by odbc spec as fourth position
+ (loop for row in rows
+ collect (fourth row))))
+
+(defmethod database-attribute-type ((attribute %database-identifier) (table %database-identifier)
+ (database generic-odbc-database)
+ &key (owner nil)
+ &aux (table (unescaped-database-identifier table))
+ (attribute (unescaped-database-identifier attribute)))
+ (declare (ignore owner))
+ (multiple-value-bind (rows col-names)
+ (funcall (list-all-table-columns-fn database) table
+ :db (odbc-conn database))
+ (declare (ignore col-names))
+ ;; COLUMN_NAME is hard-coded by odbc spec as fourth position
+ ;; TYPE_NAME is the sixth column
+ ;; PRECISION/COLUMN_SIZE is the seventh column
+ ;; SCALE/DECIMAL_DIGITS is the ninth column
+ ;; NULLABLE is the eleventh column
+ (loop for row in rows
+ when (string-equal attribute (fourth row))
+ do
+ (let ((size (seventh row))
+ (precision (ninth row))
+ (scale (nth 10 row)))
+ (return (values (ensure-keyword (sixth row))
+ (when size (parse-integer size))
+ (when precision (parse-integer precision))
+ (when scale (parse-integer scale))))))))
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