1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
R version 3.3.1 (2016-06-21) -- "Bug in Your Hair"
Copyright (C) 2016 The R Foundation for Statistical Computing
Platform: x86_64-pc-linux-gnu (64-bit)
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
>
> ## Test of date and datetime types, based on earlier version in inst/devTests
> ##
> ## Dirk Eddelbuettel, 21 Oct 2008
>
> dbTypeTests <- function(con, dateclass="timestamp without time zone") {
+ cat("\n\n**** Trying with ", dateclass, "\n")
+
+ if (dbExistsTable(con, "tempostgrestable"))
+ dbRemoveTable(con, "tempostgrestable")
+
+ dbGetQuery(con, paste("create table tempostgrestable (tt ", dateclass, ", zz integer);", sep=""))
+ dbGetQuery(con, "insert into tempostgrestable values('2008-07-01 14:15:16.123', 1);")
+
+ now <- ISOdatetime(2000,1,2,3,4,5.678)
+ dbGetQuery(con, paste("insert into tempostgrestable values('", format(now), "', 2);", sep=""))
+
+ res <- dbReadTable(con, "tempostgrestable")
+ print(res)
+
+ res <- dbSendQuery(con, "select tt from tempostgrestable;")
+ data <- fetch(res, n=-1)
+ print(dbColumnInfo(res))
+
+ times <- data[,1]
+ print(times)
+ print(class(times[1]))
+
+ print(diff(times))
+
+ dbRemoveTable(con, "tempostgrestable")
+ invisible(NULL)
+ }
>
> ## only run this if this env.var is set correctly
> if ((Sys.getenv("POSTGRES_USER") != "") &
+ (Sys.getenv("POSTGRES_HOST") != "") &
+ (Sys.getenv("POSTGRES_DATABASE") != "")) {
+
+ ## try to load our module and abort if this fails
+ stopifnot(require(RPostgreSQL))
+
+ ## Force a timezone to make the tests comparable at different locations
+ Sys.setenv("PGDATESTYLE"="German")
+ Sys.setenv("TZ"="UTC")
+
+ ## load the PostgresSQL driver
+ drv <- dbDriver("PostgreSQL")
+ ## can't print result as it contains process id which changes print(summary(drv))
+
+ ## connect to the default db
+ con <- dbConnect(drv,
+ user=Sys.getenv("POSTGRES_USER"),
+ password=Sys.getenv("POSTGRES_PASSWD"),
+ host=Sys.getenv("POSTGRES_HOST"),
+ dbname=Sys.getenv("POSTGRES_DATABASE"),
+ port=ifelse((p<-Sys.getenv("POSTGRES_PORT"))!="", p, 5432))
+
+ dbTypeTests(con, "timestamp")
+ # dbTypeTests(con, "timestamp with time zone")
+ # output differs depending on the compute environment
+ dbTypeTests(con, "date")
+
+ dbDisconnect(con)
+ }
Loading required package: RPostgreSQL
Loading required package: DBI
**** Trying with timestamp
tt zz
1 2008-07-01 14:15:16 1
2 2000-01-02 03:04:05 2
name Sclass type len precision scale nullOK
1 tt POSIXct TIMESTAMP 8 -1 -1 TRUE
[1] "2008-07-01 14:15:16 UTC" "2000-01-02 03:04:05 UTC"
[1] "POSIXct" "POSIXt"
Time difference of -3103.466 days
**** Trying with date
tt zz
1 2008-07-01 1
2 2000-01-02 2
name Sclass type len precision scale nullOK
1 tt Date DATE 4 -1 -1 TRUE
[1] "2008-07-01" "2000-01-02"
[1] "Date"
Time difference of -3103 days
[1] TRUE
>
>
> proc.time()
user system elapsed
0.500 0.040 0.586
|
