169 lines
5.0 KiB
HTML
169 lines
5.0 KiB
HTML
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<div class="fancy_title">
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The UINT Collating Sequence
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<h1 id="overview"><span>1. </span>Overview</h1>
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<p> The UINT collating sequences is a <a href="loadext.html">loadable extension</a> for
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SQLite that implements a new collating sequence that compares text
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containing unsigned integers in numeric order.
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</p><p> The UINT collating sequence is not a standard part of SQLite.
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It must be loaded as a separate extension. The source code to
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UINT is in the <a href="https://sqlite.org/src/file/ext/misc/uint.c">uint.c source file</a>
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in the <a href="https://sqlite.org/src/file/ext/misc">ext/misc/ folder</a> of the
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SQLite source tree.
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</p><p> The UINT collating sequence is not included in standard builds of
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the SQLite library, but it is loaded by default in the <a href="cli.html">CLI</a>. This
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is typical of the <a href="cli.html">CLI</a> which loads various extensions above and beyond
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what are available in the standard SQLite library.
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</p><p> The UINT collating sequence works just like the default
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BINARY collating sequence for text, except that embedded strings
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of digits compare in numeric order.
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</p><ul>
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<li><p>
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Leading zeros are handled properly, in the sense that
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they do not mess of the maginitude comparison of embedded
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strings of digits. "x00123y" is equal to "x123y".
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</p></li><li><p>
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Only unsigned integers are recognized. Plus and minus
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signs are ignored. Decimal points and exponential notation
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are ignored.
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</p></li><li><p>
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Embedded integers can be of arbitrary length. Comparison
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is not limited to integers that can be expressed as a
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64-bit machine integer.
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</p></li></ul>
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<h1 id="example_"><span>2. </span>Example:</h1>
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<blockquote>
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<table border="1" cellspacing="0" cellpadding="10">
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<tr><th>COLLATE binary</th><th>COLLATE uint</th></tr>
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<tr><td valign="top" align="left"><pre>
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'0000123457'
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'123456'
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'abc0000000010xyz'
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'abc0010xyy'
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'abc10xzz'
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'abc674xyz'
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'abc87xyz'
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'abc9xyz'</pre></td>
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<td valign="top" align="left"><pre>
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'123456'
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'0000123457'
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'abc9xyz'
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'abc0010xyy'
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'abc0000000010xyz'
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'abc10xzz'
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'abc87xyz'
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'abc674xyz'</pre></td>
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</tr></table>
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</blockquote>
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