174 lines
6.1 KiB
HTML
174 lines
6.1 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>Find all elements on the right-hand side of an IN constraint.</title>
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<!-- path=../ -->
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</head>
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<body>
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<div class=nosearch>
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<a href="../index.html">
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<ul>
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<li><a href='../about.html'>About</a>
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<li><a href='../docs.html'>Documentation</a>
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<li><a href='../download.html'>Download</a>
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<li><a href='../support.html'>Support</a>
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<li><a href='../prosupport.html'>Purchase</a>
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window.onbeforeunload = function(e){div_off("submenu");}
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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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function antiRobotDefense(){
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document.body.onmousedown=function(){
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antiRobot |= 2;
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antiRobot |= 2;
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document.body.onmousemove=null;
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}
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setTimeout(function(){
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antiRobot |= 1;
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antiRobotGo();
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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_in_first sqlite3_vtab_in_next -->
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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>Find all elements on the right-hand side of an IN constraint.</h2>
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</div>
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<blockquote><pre>
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int sqlite3_vtab_in_first(sqlite3_value *pVal, sqlite3_value **ppOut);
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int sqlite3_vtab_in_next(sqlite3_value *pVal, sqlite3_value **ppOut);
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</pre></blockquote>
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<p>
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These interfaces are only useful from within the
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<a href="../vtab.html#xfilter">xFilter() method</a> of a <a href="../vtab.html">virtual table</a> implementation.
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The result of invoking these interfaces from any other context
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is undefined and probably harmful.</p>
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<p>The X parameter in a call to sqlite3_vtab_in_first(X,P) or
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sqlite3_vtab_in_next(X,P) should be one of the parameters to the
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xFilter method which invokes these routines, and specifically
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a parameter that was previously selected for all-at-once IN constraint
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processing use the <a href="../c3ref/vtab_in.html">sqlite3_vtab_in()</a> interface in the
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<a href="../vtab.html#xbestindex">xBestIndex method</a>. If the X parameter is not
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an xFilter argument that was selected for all-at-once IN constraint
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processing, then these routines return <a href="../rescode.html#error">SQLITE_ERROR</a>.</p>
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<p>Use these routines to access all values on the right-hand side
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of the IN constraint using code like the following:</p>
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<p><blockquote><pre>
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for(rc=sqlite3_vtab_in_first(pList, &pVal);
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rc==SQLITE_OK && pVal;
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rc=sqlite3_vtab_in_next(pList, &pVal)
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){
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// do something with pVal
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}
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if( rc!=SQLITE_OK ){
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// an error has occurred
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}
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</pre></blockquote></p>
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<p>On success, the sqlite3_vtab_in_first(X,P) and sqlite3_vtab_in_next(X,P)
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routines return SQLITE_OK and set *P to point to the first or next value
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on the RHS of the IN constraint. If there are no more values on the
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right hand side of the IN constraint, then *P is set to NULL and these
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routines return <a href="../rescode.html#done">SQLITE_DONE</a>. The return value might be
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some other value, such as SQLITE_NOMEM, in the event of a malfunction.</p>
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<p>The *ppOut values returned by these routines are only valid until the
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next call to either of these routines or until the end of the xFilter
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method from which these routines were called. If the virtual table
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implementation needs to retain the *ppOut values for longer, it must make
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copies. The *ppOut values are <a href="../c3ref/value.html">protected</a>.
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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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