1;; Postgresql C library interface, example program 3, using the xedit
2;; lisp interface
3
4;;  Test the binary cursor interface
5;;
6;; populate a database by doing the following:
7;;
8;; CREATE TABLE test1 (i int4, d real, p polygon);
9;;
10;; INSERT INTO test1 values (1, 3.567, polygon '(3.0, 4.0, 1.0, 2.0)');
11;;
12;; INSERT INTO test1 values (2, 89.05, polygon '(4.0, 3.0, 2.0, 1.0)');
13;;
14;; the expected output is:
15;;
16;; tuple 0: got i = (4 bytes) 1, d = (4 bytes) 3.567000, p = (4
17;; bytes) 2 points   boundbox = (hi=3.000000/4.000000, lo =
18;; 1.000000,2.000000) tuple 1: got i = (4 bytes) 2, d = (4 bytes)
19;; 89.050003, p = (4 bytes) 2 points   boundbox =
20;; (hi=4.000000/3.000000, lo = 2.000000,1.000000)
21
22;;  Output of the lisp code:
23;;
24;; type[0] = 23, size[0] = 4
25;; type[1] = 700, size[1] = 4
26;; type[2] = 604, size[2] = -1
27;; tuple 0: got
28;;  i = (4 bytes) 1
29;;  d = (4 bytes) 3.567
30;;  p = (4 bytes) 2 points boundbox = (hi=3.0/4.0, lo = 1.0/2.0)
31;; tuple 1: got
32;;  i = (4 bytes) 2
33;;  d = (4 bytes) 89.05
34;;  p = (4 bytes) 2 points boundbox = (hi=4.0/3.0, lo = 2.0/1.0)
35
36
37(require "psql")
38
39(defun exit-nicely (conn)
40    (pq-finish conn)
41    (quit 1)
42)
43
44;; begin, by setting the parameters for a backend connection if the
45;; parameters are null, then the system will try to use reasonable
46;; defaults by looking up environment variables or, failing that,
47;; using hardwired constants
48(setq pghost nil)		; host name of the backend server
49(setq pgport nil)		; port of the backend server
50(setq pgoptions nil)		; special options to start up the backend server
51(setq pgtty nil)		; debugging tty for the backend server
52(setq pgdbname "test")		; change this to the name of your test database
53				;; XXX Note: getenv not yet implemented in the
54				 ; lisp interpreter
55
56;; make a connection to the database
57(setq conn (pq-setdb pghost pgport pgoptions pgtty pgdbname))
58
59;; check to see that the backend connection was successfully made
60(when (= (pq-status conn) pg-connection-bad)
61    (format t "Connection to database '~A' failed.~%" pgdbname)
62    (format t "~A" (pq-error-message conn))
63    (exit-nicely conn))
64
65(setq res (pq-exec conn "BEGIN"))
66(when (= (pq-status conn) pg-connection-bad)
67    (format t "BEGIN command failed~%")
68    (pq-clear res)
69    (exit-nicely conn))
70
71;; Should PQclear PGresult whenever it is no longer needed to avoid memory leaks
72(pq-clear res)
73
74(setq res (pq-exec conn "DECLARE mycursor BINARY CURSOR FOR select * from test1"))
75(when (= (pq-status conn) pg-connection-bad)
76    (format t "DECLARE CURSOR command failed~%")
77    (pq-clear res)
78    (exit-nicely conn))
79(pq-clear res)
80
81(setq res (pq-exec conn "FETCH ALL in mycursor"))
82(when (or (null res) (not (= (pq-result-status res) pgres-tuples-ok)))
83    (format t "FETCH ALL command didn't return tuples properly~%")
84    (pq-clear res)
85    (exit-nicely conn))
86
87(setq i-fnum (pq-fnumber res "i"))
88(setq d-fnum (pq-fnumber res "d"))
89(setq p-fnum (pq-fnumber res "p"))
90
91(dotimes (i 3)
92    (format t "type[~D] = ~D, size[~D] = ~D~%"
93     i (pq-ftype res i) i (pq-fsize res i))
94)
95
96(dotimes (i (pq-ntuples res))
97    (setq i-val (pq-getvalue res i i-fnum 'int32))
98    (setq d-val (pq-getvalue res i d-fnum 'float))
99    (setq p-val (pq-getvalue res i p-fnum 'pg-polygon))
100    (format t "tuple ~D: got~%" i)
101    (format t " i = (~D bytes) ~D~%" (pq-getlength res i i-fnum) i-val)
102    (format t " d = (~D bytes) ~D~%" (pq-getlength res i d-fnum) d-val)
103    (format t " p = (~D bytes) ~D points~,8@Tboundbox = (hi=~F/~F, lo = ~F/~F)~%"
104     (pq-getlength res i d-fnum) (pg-polygon-num-points p-val)
105     (pg-point-x (pg-box-high (pg-polygon-boundbox p-val)))
106     (pg-point-y (pg-box-high (pg-polygon-boundbox p-val)))
107     (pg-point-x (pg-box-low (pg-polygon-boundbox p-val)))
108     (pg-point-y (pg-box-low (pg-polygon-boundbox p-val))))
109)
110(pq-clear res)
111
112(setq res (pq-exec conn "CLOSE mycursor"))
113(pq-clear res)
114
115(setq res (pq-exec conn "COMMIT"))
116(pq-clear res)
117
118(pq-finish conn)
119