1Ace::Local(3)         User Contributed Perl Documentation        Ace::Local(3)
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NAME

6       Ace::Local - use giface, tace or gifaceclient to open a local
7       connection to an Ace database
8

SYNOPSIS

10         use Ace::Local
11         my $ace = Ace::Local->connect(-path=>'/usr/local/acedb/elegans');
12         $ace->query('find author Se*');
13         die "Query unsuccessful" unless $ace->status;
14         $ace->query('show');
15         while ($ace->encore) {
16           print $ace->read;
17         }
18

DESCRIPTION

20       This class is provided for low-level access to local (non-networked)
21       Ace databases via the giface program.  You will generally not need to
22       access it directly.  Use Ace.pm instead.
23
24       For the sake of completeness, the method can also use the aceclient
25       program for its access.  However the Ace::AceDB class is more efficient
26       for this purpose.
27

METHODS

29   connect()
30         $accessor = Ace::Local->connect(-path=>$path_to_database);
31
32       Connect to the database at the indicated path using giface and return a
33       connection object (an "accessor").  Giface must be on the current
34       search path.  Multiple accessors may be open simultaneously.
35
36       Arguments include:
37
38       -path
39           Path to the database (location of the "wspec/" directory).
40
41       -program
42           Used to indicate the location of the desired giface or gifaceclient
43           executable.  You may also use tace or aceclient, but in that case
44           the asGIF() functionality will nog work.  Can be used to override
45           the search path.
46
47       -host
48           Used when invoking gifaceclient.  Indicates the host to connect to.
49
50       -port
51           Used when invoking gifaceclient.  Indicates the port to connect to.
52
53       -nosync
54           Ordinarily Ace::Local synchronizes with the tace/giface prompt,
55           throwing out all warnings and copyright messages.  If this is set,
56           Ace::Local will not do so.  In this case you must call the
57           low_read() method until it returns undef in order to synchronize.
58
59   query()
60         $status = $accessor->query('query string');
61
62       Send the query string to the server and return a true value if
63       successful.  You must then call read() repeatedly in order to fetch the
64       query result.
65
66   read()
67       Read the result from the last query sent to the server and return it as
68       a string.  ACE may return the result in pieces, breaking between whole
69       objects.  You may need to read repeatedly in order to fetch the entire
70       result.  Canonical example:
71
72         $accessor->query("find Sequence D*");
73         die "Got an error ",$accessor->error() if $accessor->status == STATUS_ERROR;
74         while ($accessor->status == STATUS_PENDING) {
75            $result .= $accessor->read;
76         }
77
78   low_read()
79       Read whatever data's available, or undef if none.  This is only used by
80       the ace.pl replacement for giface/tace.
81
82   status()
83       Return the status code from the last operation.  Status codes are
84       exported by default when you use Ace.pm.  The status codes you may see
85       are:
86
87         STATUS_WAITING    The server is waiting for a query.
88         STATUS_PENDING    A query has been sent and Ace is waiting for
89                           you to read() the result.
90         STATUS_ERROR      A communications or syntax error has occurred
91
92   error()
93       May return a more detailed error code supplied by Ace.  Error checking
94       is not fully implemented.
95
96   encore()
97       This method will return true after you have performed one or more
98       read() operations, and indicates that there is more data to read.
99       encore() is functionally equivalent to:
100
101          $encore = $accessor->status == STATUS_PENDING;
102
103       In fact, this is how it's implemented.
104
105   auto_save()
106       Sets or queries the auto_save variable.  If true, the "save" command
107       will be issued automatically before the connection to the database is
108       severed.  The default is true.
109
110       Examples:
111
112          $accessor->auto_save(1);
113          $flag = $accessor->auto_save;
114

SEE ALSO

116       Ace, Ace::Object, Ace::Iterator, Ace::Model
117

AUTHOR

119       Lincoln Stein <lstein@w3.org> with extensive help from Jean Thierry-
120       Mieg <mieg@kaa.crbm.cnrs-mop.fr>
121
122       Copyright (c) 1997-1998, Lincoln D. Stein
123
124       This library is free software; you can redistribute it and/or modify it
125       under the same terms as Perl itself.  See DISCLAIMER.txt for
126       disclaimers of warranty.
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130perl v5.34.0                      2022-01-20                     Ace::Local(3)
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