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
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>LargeObject – Large Objects — PyGreSQL 5.0 documentation</title>
<link rel="stylesheet" href="../../_static/cloud.css" type="text/css" />
<link rel="stylesheet" href="../../_static/pygments.css" type="text/css" />
<link rel="stylesheet" href="../../_static/pygresql.css" type="text/css" />
<link rel="stylesheet" href="//fonts.googleapis.com/css?family=Noticia+Text|Open+Sans|Droid+Sans+Mono" type="text/css" />
<script type="text/javascript">
var DOCUMENTATION_OPTIONS = {
URL_ROOT: '../../',
VERSION: '5.0.3',
COLLAPSE_INDEX: false,
FILE_SUFFIX: '.html',
HAS_SOURCE: true
};
</script>
<script type="text/javascript" src="../../_static/jquery.js"></script>
<script type="text/javascript" src="../../_static/underscore.js"></script>
<script type="text/javascript" src="../../_static/doctools.js"></script>
<script type="text/javascript" src="../../_static/jquery.cookie.js"></script>
<script type="text/javascript" src="../../_static/cloud.js"></script>
<link rel="shortcut icon" href="../../_static/favicon.ico"/>
<link rel="copyright" title="Copyright" href="../../copyright.html" />
<link rel="top" title="PyGreSQL 5.0 documentation" href="../index.html" />
<link rel="up" title="pg — The Classic PyGreSQL Interface" href="index.html" />
<link rel="next" title="The Notification Handler" href="notification.html" />
<link rel="prev" title="Query methods" href="query.html" />
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body role="document">
<div class="pageheader related" role="navigation" aria-label="related navigation">
<ul>
<li><a href="../../index.html">Home</a></li>
<li><a href="../../download/index.html">Download</a></li>
<li><a href="../index.html">Documentation</a></li>
<li><a href="../../community/index.html">Community</a></li>
</ul>
<div class="logo">
<a href="../../index.html">PyGreSQL</a>
</div>
</div>
</div>
<div class="relbar-top">
<div class="related" role="navigation" aria-label="related navigation">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="../../genindex.html" title="General Index"
accesskey="I">index</a></li>
<li class="right" >
<a href="../../py-modindex.html" title="Python Module Index"
>modules</a> </li>
<li class="right" >
<a href="notification.html" title="The Notification Handler"
accesskey="N">next</a> </li>
<li class="right" >
<a href="query.html" title="Query methods"
accesskey="P">previous</a> </li>
<li><a href="../index.html">PyGreSQL 5.0 documentation</a> »</li>
<li class="nav-item nav-item-1"><a href="index.html" accesskey="U"><code class="docutils literal"><span class="pre">pg</span></code> — The Classic PyGreSQL Interface</a> »</li>
</ul>
</div>
</div>
<div class="document">
<div class="documentwrapper">
<div class="bodywrapper">
<div class="body" role="main">
<div class="section" id="largeobject-large-objects">
<h1>LargeObject – Large Objects<a class="headerlink" href="#largeobject-large-objects" title="Permalink to this headline">¶</a></h1>
<dl class="class">
<dt id="pg.LargeObject">
<em class="property">class </em><code class="descclassname">pg.</code><code class="descname">LargeObject</code><a class="headerlink" href="#pg.LargeObject" title="Permalink to this definition">¶</a></dt>
<dd></dd></dl>
<p>Objects that are instances of the class <a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> are used to handle
all the requests concerning a PostgreSQL large object. These objects embed
and hide all the “recurrent” variables (object OID and connection), exactly
in the same way <a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a> instances do, thus only keeping significant
parameters in function calls. The <a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> instance keeps a
reference to the <a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a> object used for its creation, sending
requests though with its parameters. Any modification but dereferencing the
<a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a> object will thus affect the <a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> instance.
Dereferencing the initial <a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a> object is not a problem since
Python won’t deallocate it before the <a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> instance
dereferences it. All functions return a generic error message on call error,
whatever the exact error was. The <code class="xref py py-attr docutils literal"><span class="pre">error</span></code> attribute of the object allows
to get the exact error message.</p>
<p>See also the PostgreSQL programmer’s guide for more information about the
large object interface.</p>
<div class="section" id="open-open-a-large-object">
<h2>open – open a large object<a class="headerlink" href="#open-open-a-large-object" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="pg.LargeObject.open">
<code class="descclassname">LargeObject.</code><code class="descname">open</code><span class="sig-paren">(</span><em>mode</em><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.open" title="Permalink to this definition">¶</a></dt>
<dd><p>Open a large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><p class="first"><strong>mode</strong> (<em>int</em>) – open mode definition</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection, bad parameter type, or too many parameters</li>
<li><strong>IOError</strong> – already opened object, or open error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This method opens a large object for reading/writing, in the same way than the
Unix open() function. The mode value can be obtained by OR-ing the constants
defined in the <a class="reference internal" href="index.html#module-pg" title="pg"><code class="xref py py-mod docutils literal"><span class="pre">pg</span></code></a> module (<a class="reference internal" href="module.html#pg.INV_READ" title="pg.INV_READ"><code class="xref py py-const docutils literal"><span class="pre">INV_READ</span></code></a>, <a class="reference internal" href="module.html#pg.INV_WRITE" title="pg.INV_WRITE"><code class="xref py py-const docutils literal"><span class="pre">INV_WRITE</span></code></a>).</p>
</div>
<div class="section" id="close-close-a-large-object">
<h2>close – close a large object<a class="headerlink" href="#close-close-a-large-object" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="pg.LargeObject.close">
<code class="descclassname">LargeObject.</code><code class="descname">close</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.close" title="Permalink to this definition">¶</a></dt>
<dd><p>Close a large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection</li>
<li><strong>TypeError</strong> – too many parameters</li>
<li><strong>IOError</strong> – object is not opened, or close error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This method closes a previously opened large object, in the same way than
the Unix close() function.</p>
</div>
<div class="section" id="read-write-tell-seek-unlink-file-like-large-object-handling">
<h2>read, write, tell, seek, unlink – file-like large object handling<a class="headerlink" href="#read-write-tell-seek-unlink-file-like-large-object-handling" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="pg.LargeObject.read">
<code class="descclassname">LargeObject.</code><code class="descname">read</code><span class="sig-paren">(</span><em>size</em><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.read" title="Permalink to this definition">¶</a></dt>
<dd><p>Read data from large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><p class="first"><strong>size</strong> (<em>int</em>) – maximal size of the buffer to be read</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the read buffer</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">bytes</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection, invalid object,
bad parameter type, or too many parameters</li>
<li><strong>ValueError</strong> – if <cite>size</cite> is negative</li>
<li><strong>IOError</strong> – object is not opened, or read error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This function allows to read data from a large object, starting at current
position.</p>
<dl class="method">
<dt id="pg.LargeObject.write">
<code class="descclassname">LargeObject.</code><code class="descname">write</code><span class="sig-paren">(</span><em>string</em><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.write" title="Permalink to this definition">¶</a></dt>
<dd><p>Read data to large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><p class="first"><strong>string</strong> (<em>bytes</em>) – string buffer to be written</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection, bad parameter type, or too many parameters</li>
<li><strong>IOError</strong> – object is not opened, or write error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This function allows to write data to a large object, starting at current
position.</p>
<dl class="method">
<dt id="pg.LargeObject.seek">
<code class="descclassname">LargeObject.</code><code class="descname">seek</code><span class="sig-paren">(</span><em>offset</em>, <em>whence</em><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.seek" title="Permalink to this definition">¶</a></dt>
<dd><p>Change current position in large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
<li><strong>offset</strong> (<em>int</em>) – position offset</li>
<li><strong>whence</strong> (<em>int</em>) – positional parameter</li>
</ul>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">new position in object</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">int</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection or invalid object,
bad parameter type, or too many parameters</li>
<li><strong>IOError</strong> – object is not opened, or seek error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This method allows to move the position cursor in the large object.
The valid values for the whence parameter are defined as constants in the
<a class="reference internal" href="index.html#module-pg" title="pg"><code class="xref py py-mod docutils literal"><span class="pre">pg</span></code></a> module (<a class="reference internal" href="module.html#pg.SEEK_SET" title="pg.SEEK_SET"><code class="xref py py-const docutils literal"><span class="pre">SEEK_SET</span></code></a>, <a class="reference internal" href="module.html#pg.SEEK_CUR" title="pg.SEEK_CUR"><code class="xref py py-const docutils literal"><span class="pre">SEEK_CUR</span></code></a>, <a class="reference internal" href="module.html#pg.SEEK_END" title="pg.SEEK_END"><code class="xref py py-const docutils literal"><span class="pre">SEEK_END</span></code></a>).</p>
<dl class="method">
<dt id="pg.LargeObject.tell">
<code class="descclassname">LargeObject.</code><code class="descname">tell</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.tell" title="Permalink to this definition">¶</a></dt>
<dd><p>Return current position in large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">current position in large object</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">int</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection or invalid object</li>
<li><strong>TypeError</strong> – too many parameters</li>
<li><strong>IOError</strong> – object is not opened, or seek error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This method allows to get the current position in the large object.</p>
<dl class="method">
<dt id="pg.LargeObject.unlink">
<code class="descclassname">LargeObject.</code><code class="descname">unlink</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.unlink" title="Permalink to this definition">¶</a></dt>
<dd><p>Delete large object</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection or invalid object</li>
<li><strong>TypeError</strong> – too many parameters</li>
<li><strong>IOError</strong> – object is not closed, or unlink error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This methods unlinks (deletes) the PostgreSQL large object.</p>
</div>
<div class="section" id="size-get-the-large-object-size">
<h2>size – get the large object size<a class="headerlink" href="#size-get-the-large-object-size" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="pg.LargeObject.size">
<code class="descclassname">LargeObject.</code><code class="descname">size</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.size" title="Permalink to this definition">¶</a></dt>
<dd><p>Return the large object size</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">the large object size</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">int</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection or invalid object</li>
<li><strong>TypeError</strong> – too many parameters</li>
<li><strong>IOError</strong> – object is not opened, or seek/tell error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This (composite) method allows to get the size of a large object. It was
implemented because this function is very useful for a web interfaced
database. Currently, the large object needs to be opened first.</p>
</div>
<div class="section" id="export-save-a-large-object-to-a-file">
<h2>export – save a large object to a file<a class="headerlink" href="#export-save-a-large-object-to-a-file" title="Permalink to this headline">¶</a></h2>
<dl class="method">
<dt id="pg.LargeObject.export">
<code class="descclassname">LargeObject.</code><code class="descname">export</code><span class="sig-paren">(</span><em>name</em><span class="sig-paren">)</span><a class="headerlink" href="#pg.LargeObject.export" title="Permalink to this definition">¶</a></dt>
<dd><p>Export a large object to a file</p>
<table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><p class="first"><strong>name</strong> (<em>str</em>) – file to be created</p>
</td>
</tr>
<tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body"><p class="first">None</p>
</td>
</tr>
<tr class="field-odd field"><th class="field-name">Raises:</th><td class="field-body"><ul class="first last simple">
<li><strong>TypeError</strong> – invalid connection or invalid object,
bad parameter type, or too many parameters</li>
<li><strong>IOError</strong> – object is not closed, or export error</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>
<p>This methods allows to dump the content of a large object in a very simple
way. The exported file is created on the host of the program, not the
server host.</p>
</div>
<div class="section" id="object-attributes">
<h2>Object attributes<a class="headerlink" href="#object-attributes" title="Permalink to this headline">¶</a></h2>
<p><a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> objects define a read-only set of attributes that allow
to get some information about it. These attributes are:</p>
<dl class="attribute">
<dt id="pg.LargeObject.oid">
<code class="descclassname">LargeObject.</code><code class="descname">oid</code><a class="headerlink" href="#pg.LargeObject.oid" title="Permalink to this definition">¶</a></dt>
<dd><p>the OID associated with the large object (int)</p>
</dd></dl>
<dl class="attribute">
<dt id="pg.LargeObject.pgcnx">
<code class="descclassname">LargeObject.</code><code class="descname">pgcnx</code><a class="headerlink" href="#pg.LargeObject.pgcnx" title="Permalink to this definition">¶</a></dt>
<dd><p>the <a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a> object associated with the large object</p>
</dd></dl>
<dl class="attribute">
<dt id="pg.LargeObject.error">
<code class="descclassname">LargeObject.</code><code class="descname">error</code><a class="headerlink" href="#pg.LargeObject.error" title="Permalink to this definition">¶</a></dt>
<dd><p>the last warning/error message of the connection (str)</p>
</dd></dl>
<div class="admonition warning">
<p class="first admonition-title">Warning</p>
<p class="last">In multi-threaded environments, <a class="reference internal" href="#pg.LargeObject.error" title="pg.LargeObject.error"><code class="xref py py-attr docutils literal"><span class="pre">LargeObject.error</span></code></a> may be modified by
another thread using the same <a class="reference internal" href="connection.html#pg.Connection" title="pg.Connection"><code class="xref py py-class docutils literal"><span class="pre">Connection</span></code></a>. Remember these object
are shared, not duplicated. You should provide some locking to be able
if you want to check this. The <a class="reference internal" href="#pg.LargeObject.oid" title="pg.LargeObject.oid"><code class="xref py py-attr docutils literal"><span class="pre">LargeObject.oid</span></code></a> attribute is very
interesting, because it allows you to reuse the OID later, creating the
<a class="reference internal" href="#pg.LargeObject" title="pg.LargeObject"><code class="xref py py-class docutils literal"><span class="pre">LargeObject</span></code></a> object with a <a class="reference internal" href="connection.html#pg.Connection.getlo" title="pg.Connection.getlo"><code class="xref py py-meth docutils literal"><span class="pre">Connection.getlo()</span></code></a> method call.</p>
</div>
</div>
</div>
</div>
</div>
</div>
<div class="sphinxsidebar" role="navigation" aria-label="main navigation">
<div class="sphinxsidebarwrapper">
<p class="logo"><a href="../index.html" title="contents/index">
<img class="logo" src="../../_static/pygresql.png" alt="Logo"/>
</a></p><div class="sphinxlocaltoc">
<h3><a href="../../index.html">Page contents</a></h3>
<ul>
<li><a class="reference internal" href="#">LargeObject – Large Objects</a><ul>
<li><a class="reference internal" href="#open-open-a-large-object">open – open a large object</a></li>
<li><a class="reference internal" href="#close-close-a-large-object">close – close a large object</a></li>
<li><a class="reference internal" href="#read-write-tell-seek-unlink-file-like-large-object-handling">read, write, tell, seek, unlink – file-like large object handling</a></li>
<li><a class="reference internal" href="#size-get-the-large-object-size">size – get the large object size</a></li>
<li><a class="reference internal" href="#export-save-a-large-object-to-a-file">export – save a large object to a file</a></li>
<li><a class="reference internal" href="#object-attributes">Object attributes</a></li>
</ul>
</li>
</ul>
</div>
<div class="sphinxprev">
<h4>Previous page</h4>
<p class="topless"><a href="query.html"
title="Previous page">← Query methods</a></p>
</div>
<div class="sphinxnext">
<h4>Next page</h4>
<p class="topless"><a href="notification.html"
title="Next page">→ The Notification Handler</a></p>
</div>
<div role="note" aria-label="source link">
<h3>This Page</h3>
<ul class="this-page-menu">
<li><a href="../../_sources/contents/pg/large_objects.txt"
rel="nofollow">Show Source</a></li>
</ul>
</div>
<div id="searchbox" style="display: none" role="search">
<h3>Quick search</h3>
<form class="search" action="../../search.html" method="get">
<input type="text" name="q" />
<input type="submit" value="Go" />
<input type="hidden" name="check_keywords" value="yes" />
<input type="hidden" name="area" value="default" />
</form>
</div>
<script type="text/javascript">$('#searchbox').show(0);</script>
</div>
</div>
<div class="clearer"></div>
</div>
<div class="relbar-bottom">
<div class="related" role="navigation" aria-label="related navigation">
<h3>Navigation</h3>
<ul>
<li class="right" style="margin-right: 10px">
<a href="../../genindex.html" title="General Index"
>index</a></li>
<li class="right" >
<a href="../../py-modindex.html" title="Python Module Index"
>modules</a> </li>
<li class="right" >
<a href="notification.html" title="The Notification Handler"
>next</a> </li>
<li class="right" >
<a href="query.html" title="Query methods"
>previous</a> </li>
<li><a href="../index.html">PyGreSQL 5.0 documentation</a> »</li>
<li class="nav-item nav-item-1"><a href="index.html" ><code class="docutils literal"><span class="pre">pg</span></code> — The Classic PyGreSQL Interface</a> »</li>
</ul>
</div>
</div>
<div class="footer" role="contentinfo">
© <a href="../../copyright.html">Copyright</a> 2016, The PyGreSQL team.
Created using <a href="http://sphinx-doc.org/">Sphinx</a> 1.4.1.
</div>
<!-- cloud_sptheme 1.4 -->
</body>
</html>
|
