From 78908906a5ebedba5762cb6ac392bfed651c7c7c Mon Sep 17 00:00:00 2001
From: Yves Fischer <yvesf-git@xapek.org>
Date: Sun, 4 Mar 2012 22:22:51 +0100
Subject: ebus-racket: inserter.rkt , overall improvements

---
 ebus-racket/db.rkt | 79 ++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 62 insertions(+), 17 deletions(-)

(limited to 'ebus-racket/db.rkt')

diff --git a/ebus-racket/db.rkt b/ebus-racket/db.rkt
index 9ebdfa9..54de8f7 100644
--- a/ebus-racket/db.rkt
+++ b/ebus-racket/db.rkt
@@ -1,40 +1,85 @@
 #lang racket/base
 (require (prefix-in db: (planet ryanc/db:1:5)))
+(require (prefix-in db: (planet ryanc/db:1:5/util/connect)))
+
+(define logger (make-logger 'ebus-db (current-logger)))
+
+(define con-user? (make-parameter "ebus"))
+(define con-password? (make-parameter "ebus"))
+(define con-database? (make-parameter "ebus"))
+(define con-server? (make-parameter "localhost"))
 
 (define pgc
-  (db:postgresql-connect #:user "ebus"
-                         #:database "ebus"
-                         #:password "ebus"
-                         #:server "10.2.2.26"))
+  (db:virtual-connection
+   (lambda ()
+     (log-message logger 'info (format "Connect to Database: user=~a database=~a server=~a" 
+				       (con-user?) (con-database?) (con-server?)) #t)
+     (db:postgresql-connect #:user (con-user?)
+			    #:database (con-database?)
+			    #:password (con-password?)
+			    #:server (con-server?)))))
+
+;; Test Database Connection
+;; Returns #t on success, #f otherwise
+(define (pgc-test)
+  (with-handlers ([exn:fail? (lambda (exn) #f)])
+    (= (db:query-value pgc "SELECT 1") 1)))
 
 ;; Query ID of sensor given by sensor-name
 ;; Returns null if sensor is undefined
 (define (get-sensor-id sensor-name)
+  (define sql-stmt "SELECT id FROM sensor WHERE name = $1")
   (with-handlers ([exn:fail?  (lambda (exn) (void))])
-    (db:query-value pgc "SELECT id FROM sensor WHERE name = $1" sensor-name)))
+    (db:query-value pgc sql-stmt sensor-name)))
 
 ;; Create Sensor-ID with given name
 ;; returns id
 (define (create-sensor-id sensor-name)
-  (db:query-exec "INSERT INTO sensor(name) VALUES ($1)" sensor-name)
+  (log-message logger 'info (format "create sensor id for ~a" sensor-name) #t)
+  (db:query-exec pgc "INSERT INTO sensor(name) VALUES ($1)" sensor-name)
   (get-sensor-id sensor-name))
 
 ;; Get ID of sensor given by sensor-name
 ;; define sensor if needed
-(define (sensor-id sensor-name)
+(define (get-or-create-sensor-id sensor-name)
   (define id (get-sensor-id sensor-name))
-  (cond ((void? id) (create-sensor-id sensor-id))
+  (cond ((void? id) (create-sensor-id sensor-name))
 	(else id)))
 
+;; Insert Field in Database
+;; Decide Database-Datatype from Ebus-Datatype
+;; then calls 'insert`
+(define (insert-field sensor-name datatype offset value)
+  (cond ((member datatype (list "data1c" "data2b" "data2c"))
+  	 ;; float
+  	 (insert sensor-name value db:sql-null db:sql-null))
+  	((member datatype (list "bit" "byte" "data1b" "word" "bcd"))
+  	 ;; int
+  	 (insert sensor-name db:sql-null value db:sql-null))
+  	((member datatype (list "byteEnum"))
+  	 ;; string
+  	 (insert sensor-name db:sql-null db:sql-null value))
+  	(else (log-message logger 'error (format "Datatype ~a is not support by DB" datatype) #t))))
+
 (define (insert sensor-name value-float value-int value-string)
-  (define sensor-id (sensor-id sensor-name))
-  (define type (cond ((not (void? value-string)) "string")
-                    ((not (void? value-float)) "float")
-                    ((not (void? value-int)) "int")))
-  (db:query-exec (string-append "INSERT INTO value(timestamp, sensor_id, type, value_float, value_int, value_string) "
-				"VALUES (now(), $1, $2, $3, $4, $5)")
-		 sensor-id type value-float value-int value-string))
+  (define sensor-id (get-or-create-sensor-id sensor-name))
+  (define type (cond ((not (db:sql-null? value-string)) "string")
+		     ((not (db:sql-null? value-float)) "float")
+		     ((not (db:sql-null? value-int)) "int")))
+  (define sql-stmt 
+    (string-append "INSERT INTO value(timestamp, sensor_id, type, value_float, value_int, value_string) "
+		   "VALUES (now(), $1, $2, $3, $4, $5)"))
+  (log-message logger 'info (string-append sql-stmt "\n\t\t"
+					   (format
+					    "sensor-id=~a type=~a value-float=~a value-int=~a value-string=~a"
+					    sensor-id type value-float value-int value-string)) #t)
+  (db:query-exec sql-stmt sensor-id type value-float value-int value-string))
 
 (provide
- (prefix-out db- insert))
-
+ (prefix-out db- logger)
+ (prefix-out db- con-user?)
+ (prefix-out db- con-password?)
+ (prefix-out db- con-database?)
+ (prefix-out db- con-server?)
+ (prefix-out db- pgc-test)
+ (prefix-out db- insert-field))
-- 
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