160 lines
5.6 KiB
HTML
160 lines
5.6 KiB
HTML
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<!DOCTYPE html>
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<html><head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<link href="../sqlite.css" rel="stylesheet">
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<title>Determine The Collation For a Virtual Table Constraint</title>
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<li><a href='../download.html'>Download</a>
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function antiRobotGo(){
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if( antiRobot!=3 ) return;
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antiRobot = 7;
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if(j && j.hasAttribute("data-href")) j.href=j.getAttribute("data-href");
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}
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document.body.onmousedown=function(){
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antiRobot |= 2;
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antiRobotGo();
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document.body.onmousedown=null;
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}
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antiRobot |= 2;
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}
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antiRobot |= 1;
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}, 100)
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antiRobotGo();
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}
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antiRobotDefense();
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</script>
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<!-- keywords: sqlite3_vtab_collation -->
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<div class=nosearch>
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<a href="../c3ref/intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Determine The Collation For a Virtual Table Constraint</h2>
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</div>
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<blockquote><pre>
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const char *sqlite3_vtab_collation(sqlite3_index_info*,int);
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</pre></blockquote>
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<p>
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This function may only be called from within a call to the <a href="../vtab.html#xbestindex">xBestIndex</a>
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method of a <a href="../vtab.html">virtual table</a>. This function returns a pointer to a string
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that is the name of the appropriate collation sequence to use for text
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comparisons on the constraint identified by its arguments.</p>
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<p>The first argument must be the pointer to the <a href="../c3ref/index_info.html">sqlite3_index_info</a> object
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that is the first parameter to the xBestIndex() method. The second argument
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must be an index into the aConstraint[] array belonging to the
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sqlite3_index_info structure passed to xBestIndex.</p>
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<p>Important:
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The first parameter must be the same pointer that is passed into the
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xBestMethod() method. The first parameter may not be a pointer to a
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different <a href="../c3ref/index_info.html">sqlite3_index_info</a> object, even an exact copy.</p>
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<p>The return value is computed as follows:</p>
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<p><ol>
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<li><p> If the constraint comes from a WHERE clause expression that contains
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a <a href="../lang_expr.html#collateop">COLLATE operator</a>, then the name of the collation specified by
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that COLLATE operator is returned.
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<li><p> If there is no COLLATE operator, but the column that is the subject
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of the constraint specifies an alternative collating sequence via
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a <a href="../lang_createtable.html#collateclause">COLLATE clause</a> on the column definition within the CREATE TABLE
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statement that was passed into <a href="../c3ref/declare_vtab.html">sqlite3_declare_vtab()</a>, then the
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name of that alternative collating sequence is returned.
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<li><p> Otherwise, "BINARY" is returned.
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</ol>
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</p><p>See also lists of
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<a href="../c3ref/objlist.html">Objects</a>,
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<a href="../c3ref/constlist.html">Constants</a>, and
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<a href="../c3ref/funclist.html">Functions</a>.</p>
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