138 lines
4.9 KiB
HTML
138 lines
4.9 KiB
HTML
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Collation Needed Callbacks</h2>
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</div>
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<blockquote><pre>
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int sqlite3_collation_needed(
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sqlite3*,
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void*,
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void(*)(void*,sqlite3*,int eTextRep,const char*)
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);
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int sqlite3_collation_needed16(
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sqlite3*,
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void*,
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void(*)(void*,sqlite3*,int eTextRep,const void*)
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);
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</pre></blockquote>
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<p>
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To avoid having to register all collation sequences before a database
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can be used, a single callback function may be registered with the
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<a href="../c3ref/sqlite3.html">database connection</a> to be invoked whenever an undefined collation
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sequence is required.</p>
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<p>If the function is registered using the sqlite3_collation_needed() API,
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then it is passed the names of undefined collation sequences as strings
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encoded in UTF-8. If sqlite3_collation_needed16() is used,
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the names are passed as UTF-16 in machine native byte order.
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A call to either function replaces the existing collation-needed callback.</p>
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<p>When the callback is invoked, the first argument passed is a copy
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of the second argument to sqlite3_collation_needed() or
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sqlite3_collation_needed16(). The second argument is the database
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connection. The third argument is one of <a href="../c3ref/c_any.html">SQLITE_UTF8</a>, <a href="../c3ref/c_any.html">SQLITE_UTF16BE</a>,
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or <a href="../c3ref/c_any.html">SQLITE_UTF16LE</a>, indicating the most desirable form of the collation
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sequence function required. The fourth parameter is the name of the
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required collation sequence.</p>
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<p>The callback function should register the desired collation using
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<a href="../c3ref/create_collation.html">sqlite3_create_collation()</a>, <a href="../c3ref/create_collation.html">sqlite3_create_collation16()</a>, or
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<a href="../c3ref/create_collation.html">sqlite3_create_collation_v2()</a>.
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</p><p>See also lists of
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<a href="objlist.html">Objects</a>,
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<a href="constlist.html">Constants</a>, and
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<a href="funclist.html">Functions</a>.</p>
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