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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:28:19 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-05-05 17:28:19 +0000
commit18657a960e125336f704ea058e25c27bd3900dcb (patch)
tree17b438b680ed45a996d7b59951e6aa34023783f2 /www/uintcseq.html
parentInitial commit. (diff)
downloadsqlite3-18657a960e125336f704ea058e25c27bd3900dcb.tar.xz
sqlite3-18657a960e125336f704ea058e25c27bd3900dcb.zip
Adding upstream version 3.40.1.upstream/3.40.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<div class=fancy>
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+<div class="fancy_title">
+The UINT Collating Sequence
+</div>
+</div>
+
+
+
+
+
+<h1 id="overview"><span>1. </span>Overview</h1>
+
+<p> The UINT collating sequences is a <a href="loadext.html">loadable extension</a> for
+SQLite that implements a new collating sequence that compares text
+containing unsigned integers in numeric order.
+
+</p><p> The UINT collating sequence is not a standard part of SQLite.
+It must be loaded as a separate extension. The source code to
+UINT is in the <a href="https://sqlite.org/src/file/ext/misc/uint.c">uint.c source file</a>
+in the <a href="https://sqlite.org/src/file/ext/misc">ext/misc/ folder</a> of the
+SQLite source tree.
+
+</p><p> The UINT collating sequence is not included in standard builds of
+the SQLite library, but it is loaded by default in the <a href="cli.html">CLI</a>. This
+is typical of the <a href="cli.html">CLI</a> which loads various extensions above and beyond
+what are available in the standard SQLite library.
+
+</p><p> The UINT collating sequence works just like the default
+BINARY collating sequence for text, except that embedded strings
+of digits compare in numeric order.
+
+</p><ul>
+<li><p>
+Leading zeros are handled properly, in the sense that
+they do not mess of the maginitude comparison of embedded
+strings of digits. "x00123y" is equal to "x123y".
+
+</p></li><li><p>
+Only unsigned integers are recognized. Plus and minus
+signs are ignored. Decimal points and exponential notation
+are ignored.
+
+</p></li><li><p>
+Embedded integers can be of arbitrary length. Comparison
+is not limited to integers that can be expressed as a
+64-bit machine integer.
+</p></li></ul>
+
+<h1 id="example_"><span>2. </span>Example:</h1>
+
+<blockquote>
+<table border="1" cellspacing="0" cellpadding="10">
+<tr><th>COLLATE binary</th><th>COLLATE uint</th></tr>
+<tr><td valign="top" align="left"><pre>
+'0000123457'
+'123456'
+'abc0000000010xyz'
+'abc0010xyy'
+'abc10xzz'
+'abc674xyz'
+'abc87xyz'
+'abc9xyz'</pre></td>
+<td valign="top" align="left"><pre>
+'123456'
+'0000123457'
+'abc9xyz'
+'abc0010xyy'
+'abc0000000010xyz'
+'abc10xzz'
+'abc87xyz'
+'abc674xyz'</pre></td>
+</tr></table>
+</blockquote>
+<p align="center"><small><i>This page last modified on <a href="https://sqlite.org/docsrc/honeypot" id="mtimelink" data-href="https://sqlite.org/docsrc/finfo/pages/uintcseq.in?m=36e3e7c849c6d1d72">2020-05-14 00:36:17</a> UTC </small></i></p>
+