162 lines
6.9 KiB
HTML
162 lines
6.9 KiB
HTML
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<title>Last Insert Rowid</title>
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<!-- keywords: sqlite3_last_insert_rowid -->
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<a href="intro.html"><h2>SQLite C Interface</h2></a>
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<h2>Last Insert Rowid</h2>
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</div>
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<blockquote><pre>
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sqlite3_int64 sqlite3_last_insert_rowid(sqlite3*);
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</pre></blockquote>
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<p>
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Each entry in most SQLite tables (except for <a href="../withoutrowid.html">WITHOUT ROWID</a> tables)
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has a unique 64-bit signed
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integer key called the <a href="../lang_createtable.html#rowid">"rowid"</a>. The rowid is always available
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as an undeclared column named ROWID, OID, or _ROWID_ as long as those
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names are not also used by explicitly declared columns. If
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the table has a column of type <a href="../lang_createtable.html#rowid">INTEGER PRIMARY KEY</a> then that column
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is another alias for the rowid.</p>
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<p>The sqlite3_last_insert_rowid(D) interface usually returns the <a href="../lang_createtable.html#rowid">rowid</a> of
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the most recent successful <a href="../lang_insert.html">INSERT</a> into a rowid table or <a href="../vtab.html">virtual table</a>
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on database connection D. Inserts into <a href="../withoutrowid.html">WITHOUT ROWID</a> tables are not
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recorded. If no successful <a href="../lang_insert.html">INSERT</a>s into rowid tables have ever occurred
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on the database connection D, then sqlite3_last_insert_rowid(D) returns
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zero.</p>
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<p>As well as being set automatically as rows are inserted into database
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tables, the value returned by this function may be set explicitly by
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<a href="../c3ref/set_last_insert_rowid.html">sqlite3_set_last_insert_rowid()</a></p>
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<p>Some virtual table implementations may INSERT rows into rowid tables as
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part of committing a transaction (e.g. to flush data accumulated in memory
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to disk). In this case subsequent calls to this function return the rowid
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associated with these internal INSERT operations, which leads to
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unintuitive results. Virtual table implementations that do write to rowid
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tables in this way can avoid this problem by restoring the original
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rowid value using <a href="../c3ref/set_last_insert_rowid.html">sqlite3_set_last_insert_rowid()</a> before returning
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control to the user.</p>
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<p>If an <a href="../lang_insert.html">INSERT</a> occurs within a trigger then this routine will
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return the <a href="../lang_createtable.html#rowid">rowid</a> of the inserted row as long as the trigger is
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running. Once the trigger program ends, the value returned
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by this routine reverts to what it was before the trigger was fired.</p>
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<p>An <a href="../lang_insert.html">INSERT</a> that fails due to a constraint violation is not a
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successful <a href="../lang_insert.html">INSERT</a> and does not change the value returned by this
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routine. Thus INSERT OR FAIL, INSERT OR IGNORE, INSERT OR ROLLBACK,
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and INSERT OR ABORT make no changes to the return value of this
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routine when their insertion fails. When INSERT OR REPLACE
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encounters a constraint violation, it does not fail. The
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INSERT continues to completion after deleting rows that caused
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the constraint problem so INSERT OR REPLACE will always change
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the return value of this interface.</p>
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<p>For the purposes of this routine, an <a href="../lang_insert.html">INSERT</a> is considered to
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be successful even if it is subsequently rolled back.</p>
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<p>This function is accessible to SQL statements via the
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<a href="../lang_corefunc.html#last_insert_rowid">last_insert_rowid() SQL function</a>.</p>
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<p>If a separate thread performs a new <a href="../lang_insert.html">INSERT</a> on the same
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database connection while the <a href="../c3ref/last_insert_rowid.html">sqlite3_last_insert_rowid()</a>
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function is running and thus changes the last insert <a href="../lang_createtable.html#rowid">rowid</a>,
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then the value returned by <a href="../c3ref/last_insert_rowid.html">sqlite3_last_insert_rowid()</a> is
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unpredictable and might not equal either the old or the new
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last insert <a href="../lang_createtable.html#rowid">rowid</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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