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<a href="intro.html"><h2>SQLite C Interface</h2></a><h2>Virtual Table Configuration Options</h2><blockquote><pre>#define SQLITE_VTAB_CONSTRAINT_SUPPORT 1
</pre></blockquote><p>
These macros define the various options to the
<a href="../c3ref/vtab_config.html">sqlite3_vtab_config()</a> interface that <a href="../vtab.html">virtual table</a> implementations
can use to customize and optimize their behavior.</p>
<p><dl>
<dt>SQLITE_VTAB_CONSTRAINT_SUPPORT
<dd>Calls of the form
<a href="../c3ref/vtab_config.html">sqlite3_vtab_config</a>(db,SQLITE_VTAB_CONSTRAINT_SUPPORT,X) are supported,
where X is an integer. If X is zero, then the <a href="../vtab.html">virtual table</a> whose
<a href="../vtab.html#xcreate">xCreate</a> or <a href="../vtab.html#xconnect">xConnect</a> method invoked <a href="../c3ref/vtab_config.html">sqlite3_vtab_config()</a> does not
support constraints. In this configuration (which is the default) if
a call to the <a href="../vtab.html#xupdate">xUpdate</a> method returns <a href="../rescode.html#constraint">SQLITE_CONSTRAINT</a>, then the entire
statement is rolled back as if <a href="../lang_conflict.html">OR ABORT</a> had been
specified as part of the users SQL statement, regardless of the actual
ON CONFLICT mode specified.</p>
<p>If X is non-zero, then the virtual table implementation guarantees
that if <a href="../vtab.html#xupdate">xUpdate</a> returns <a href="../rescode.html#constraint">SQLITE_CONSTRAINT</a>, it will do so before
any modifications to internal or persistent data structures have been made.
If the <a href="../lang_conflict.html">ON CONFLICT</a> mode is ABORT, FAIL, IGNORE or ROLLBACK, SQLite
is able to roll back a statement or database transaction, and abandon
or continue processing the current SQL statement as appropriate.
If the ON CONFLICT mode is REPLACE and the <a href="../vtab.html#xupdate">xUpdate</a> method returns
<a href="../rescode.html#constraint">SQLITE_CONSTRAINT</a>, SQLite handles this as if the ON CONFLICT mode
had been ABORT.</p>
<p>Virtual table implementations that are required to handle OR REPLACE
must do so within the <a href="../vtab.html#xupdate">xUpdate</a> method. If a call to the
<a href="../c3ref/vtab_on_conflict.html">sqlite3_vtab_on_conflict()</a> function indicates that the current ON
CONFLICT policy is REPLACE, the virtual table implementation should
silently replace the appropriate rows within the xUpdate callback and
return SQLITE_OK. Or, if this is not possible, it may return
SQLITE_CONSTRAINT, in which case SQLite falls back to OR ABORT
constraint handling.
</dl>
</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>
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