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+<title>Evaluate An SQL Statement</title>
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+<!-- keywords: sqlite3_step -->
+<div class=nosearch>
+<a href="intro.html"><h2>SQLite C Interface</h2></a>
+<h2>Evaluate An SQL Statement</h2>
+</div>
+<blockquote><pre>
+int sqlite3_step(sqlite3_stmt*);
+</pre></blockquote>
+<p>
+After a <a href="../c3ref/stmt.html">prepared statement</a> has been prepared using any of
+<a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>, <a href="../c3ref/prepare.html">sqlite3_prepare_v3()</a>, <a href="../c3ref/prepare.html">sqlite3_prepare16_v2()</a>,
+or <a href="../c3ref/prepare.html">sqlite3_prepare16_v3()</a> or one of the legacy
+interfaces <a href="../c3ref/prepare.html">sqlite3_prepare()</a> or <a href="../c3ref/prepare.html">sqlite3_prepare16()</a>, this function
+must be called one or more times to evaluate the statement.</p>
+
+<p>The details of the behavior of the sqlite3_step() interface depend
+on whether the statement was prepared using the newer "vX" interfaces
+<a href="../c3ref/prepare.html">sqlite3_prepare_v3()</a>, <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>, <a href="../c3ref/prepare.html">sqlite3_prepare16_v3()</a>,
+<a href="../c3ref/prepare.html">sqlite3_prepare16_v2()</a> or the older legacy
+interfaces <a href="../c3ref/prepare.html">sqlite3_prepare()</a> and <a href="../c3ref/prepare.html">sqlite3_prepare16()</a>.  The use of the
+new "vX" interface is recommended for new applications but the legacy
+interface will continue to be supported.</p>
+
+<p>In the legacy interface, the return value will be either <a href="../rescode.html#busy">SQLITE_BUSY</a>,
+<a href="../rescode.html#done">SQLITE_DONE</a>, <a href="../rescode.html#row">SQLITE_ROW</a>, <a href="../rescode.html#error">SQLITE_ERROR</a>, or <a href="../rescode.html#misuse">SQLITE_MISUSE</a>.
+With the "v2" interface, any of the other <a href="../rescode.html">result codes</a> or
+<a href="../rescode.html#extrc">extended result codes</a> might be returned as well.</p>
+
+<p><a href="../rescode.html#busy">SQLITE_BUSY</a> means that the database engine was unable to acquire the
+database locks it needs to do its job.  If the statement is a <a href="../lang_transaction.html">COMMIT</a>
+or occurs outside of an explicit transaction, then you can retry the
+statement.  If the statement is not a <a href="../lang_transaction.html">COMMIT</a> and occurs within an
+explicit transaction then you should rollback the transaction before
+continuing.</p>
+
+<p><a href="../rescode.html#done">SQLITE_DONE</a> means that the statement has finished executing
+successfully.  sqlite3_step() should not be called again on this virtual
+machine without first calling <a href="../c3ref/reset.html">sqlite3_reset()</a> to reset the virtual
+machine back to its initial state.</p>
+
+<p>If the SQL statement being executed returns any data, then <a href="../rescode.html#row">SQLITE_ROW</a>
+is returned each time a new row of data is ready for processing by the
+caller. The values may be accessed using the <a href="../c3ref/column_blob.html">column access functions</a>.
+sqlite3_step() is called again to retrieve the next row of data.</p>
+
+<p><a href="../rescode.html#error">SQLITE_ERROR</a> means that a run-time error (such as a constraint
+violation) has occurred.  sqlite3_step() should not be called again on
+the VM. More information may be found by calling <a href="../c3ref/errcode.html">sqlite3_errmsg()</a>.
+With the legacy interface, a more specific error code (for example,
+<a href="../rescode.html#interrupt">SQLITE_INTERRUPT</a>, <a href="../rescode.html#schema">SQLITE_SCHEMA</a>, <a href="../rescode.html#corrupt">SQLITE_CORRUPT</a>, and so forth)
+can be obtained by calling <a href="../c3ref/reset.html">sqlite3_reset()</a> on the
+<a href="../c3ref/stmt.html">prepared statement</a>.  In the "v2" interface,
+the more specific error code is returned directly by sqlite3_step().</p>
+
+<p><a href="../rescode.html#misuse">SQLITE_MISUSE</a> means that the this routine was called inappropriately.
+Perhaps it was called on a <a href="../c3ref/stmt.html">prepared statement</a> that has
+already been <a href="../c3ref/finalize.html">finalized</a> or on one that had
+previously returned <a href="../rescode.html#error">SQLITE_ERROR</a> or <a href="../rescode.html#done">SQLITE_DONE</a>.  Or it could
+be the case that the same database connection is being used by two or
+more threads at the same moment in time.</p>
+
+<p>For all versions of SQLite up to and including 3.6.23.1, a call to
+<a href="../c3ref/reset.html">sqlite3_reset()</a> was required after sqlite3_step() returned anything
+other than <a href="../rescode.html#row">SQLITE_ROW</a> before any subsequent invocation of
+sqlite3_step().  Failure to reset the prepared statement using
+<a href="../c3ref/reset.html">sqlite3_reset()</a> would result in an <a href="../rescode.html#misuse">SQLITE_MISUSE</a> return from
+sqlite3_step().  But after <a href="../releaselog/3_6_23_1.html">version 3.6.23.1</a> (2010-03-26,
+sqlite3_step() began
+calling <a href="../c3ref/reset.html">sqlite3_reset()</a> automatically in this circumstance rather
+than returning <a href="../rescode.html#misuse">SQLITE_MISUSE</a>.  This is not considered a compatibility
+break because any application that ever receives an SQLITE_MISUSE error
+is broken by definition.  The <a href="../compile.html#omit_autoreset">SQLITE_OMIT_AUTORESET</a> compile-time option
+can be used to restore the legacy behavior.</p>
+
+<p><b>Goofy Interface Alert:</b> In the legacy interface, the sqlite3_step()
+API always returns a generic error code, <a href="../rescode.html#error">SQLITE_ERROR</a>, following any
+error other than <a href="../rescode.html#busy">SQLITE_BUSY</a> and <a href="../rescode.html#misuse">SQLITE_MISUSE</a>.  You must call
+<a href="../c3ref/reset.html">sqlite3_reset()</a> or <a href="../c3ref/finalize.html">sqlite3_finalize()</a> in order to find one of the
+specific <a href="../rescode.html">error codes</a> that better describes the error.
+We admit that this is a goofy design.  The problem has been fixed
+with the "v2" interface.  If you prepare all of your SQL statements
+using <a href="../c3ref/prepare.html">sqlite3_prepare_v3()</a> or <a href="../c3ref/prepare.html">sqlite3_prepare_v2()</a>
+or <a href="../c3ref/prepare.html">sqlite3_prepare16_v2()</a> or <a href="../c3ref/prepare.html">sqlite3_prepare16_v3()</a> instead
+of the legacy <a href="../c3ref/prepare.html">sqlite3_prepare()</a> and <a href="../c3ref/prepare.html">sqlite3_prepare16()</a> interfaces,
+then the more specific <a href="../rescode.html">error codes</a> are returned directly
+by sqlite3_step().  The use of the "vX" interfaces is recommended.
+</p><p>See also lists of
+  <a href="objlist.html">Objects</a>,
+  <a href="constlist.html">Constants</a>, and
+  <a href="funclist.html">Functions</a>.</p>
+