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diff --git a/www/c3ref/last_insert_rowid.html b/www/c3ref/last_insert_rowid.html new file mode 100644 index 0000000..0b165a4 --- /dev/null +++ b/www/c3ref/last_insert_rowid.html @@ -0,0 +1,186 @@ +<!DOCTYPE html> +<html><head> +<meta name="viewport" content="width=device-width, initial-scale=1.0"> +<meta http-equiv="content-type" content="text/html; charset=UTF-8"> +<link href="../sqlite.css" rel="stylesheet"> +<title>Last Insert Rowid</title> +<!-- path=../ --> +</head> +<body> +<div class=nosearch> +<a href="../index.html"> +<img class="logo" src="../images/sqlite370_banner.gif" alt="SQLite" border="0"> +</a> +<div><!-- IE hack to prevent disappearing logo --></div> +<div class="tagline desktoponly"> +Small. Fast. 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The rowid is always available +as an undeclared column named ROWID, OID, or _ROWID_ as long as those +names are not also used by explicitly declared columns. If +the table has a column of type <a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> then that column +is another alias for the rowid.</p> + +<p>The sqlite3_last_insert_rowid(D) interface usually returns the <a href="../lang_createtable.html#rowid">rowid</a> of +the most recent successful <a href="../lang_insert.html">INSERT</a> into a rowid table or <a href="../vtab.html">virtual table</a> +on database connection D. Inserts into <a href="../withoutrowid.html">WITHOUT ROWID</a> tables are not +recorded. If no successful <a href="../lang_insert.html">INSERT</a>s into rowid tables have ever occurred +on the database connection D, then sqlite3_last_insert_rowid(D) returns +zero.</p> + +<p>As well as being set automatically as rows are inserted into database +tables, the value returned by this function may be set explicitly by +<a href="../c3ref/set_last_insert_rowid.html">sqlite3_set_last_insert_rowid()</a></p> + +<p>Some virtual table implementations may INSERT rows into rowid tables as +part of committing a transaction (e.g. to flush data accumulated in memory +to disk). In this case subsequent calls to this function return the rowid +associated with these internal INSERT operations, which leads to +unintuitive results. Virtual table implementations that do write to rowid +tables in this way can avoid this problem by restoring the original +rowid value using <a href="../c3ref/set_last_insert_rowid.html">sqlite3_set_last_insert_rowid()</a> before returning +control to the user.</p> + +<p>If an <a href="../lang_insert.html">INSERT</a> occurs within a trigger then this routine will +return the <a href="../lang_createtable.html#rowid">rowid</a> of the inserted row as long as the trigger is +running. Once the trigger program ends, the value returned +by this routine reverts to what it was before the trigger was fired.</p> + +<p>An <a href="../lang_insert.html">INSERT</a> that fails due to a constraint violation is not a +successful <a href="../lang_insert.html">INSERT</a> and does not change the value returned by this +routine. Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK, +and INSERT OR ABORT make no changes to the return value of this +routine when their insertion fails. When INSERT OR REPLACE +encounters a constraint violation, it does not fail. The +INSERT continues to completion after deleting rows that caused +the constraint problem so INSERT OR REPLACE will always change +the return value of this interface.</p> + +<p>For the purposes of this routine, an <a href="../lang_insert.html">INSERT</a> is considered to +be successful even if it is subsequently rolled back.</p> + +<p>This function is accessible to SQL statements via the +<a href="../lang_corefunc.html#last_insert_rowid">last_insert_rowid() SQL function</a>.</p> + +<p>If a separate thread performs a new <a href="../lang_insert.html">INSERT</a> on the same +database connection while the <a href="../c3ref/last_insert_rowid.html">sqlite3_last_insert_rowid()</a> +function is running and thus changes the last insert <a href="../lang_createtable.html#rowid">rowid</a>, +then the value returned by <a href="../c3ref/last_insert_rowid.html">sqlite3_last_insert_rowid()</a> is +unpredictable and might not equal either the old or the new +last insert <a href="../lang_createtable.html#rowid">rowid</a>. +</p><p>See also lists of + <a href="../c3ref/objlist.html">Objects</a>, + <a href="../c3ref/constlist.html">Constants</a>, and + <a href="../c3ref/funclist.html">Functions</a>.</p> + |