MySQL: Support CHECK constraint

added list of check constraints to mysql table view

added create, alter, drop check constraints (mysql)

chore: use the correct function to sql-escape

fix: feature detection for check constraints (mysql)

fix: get check constraint info (mysql)

correct the capitalization of a section title

to be consistent with the other section titles

added a missing `</thead>`

adminer/check.inc.php

@@ -0,0 +1,35 @@
+<?php
+$TABLE = $_GET["check"];
+$name = $_GET["name"];
+$row = $_POST;
+
+if ($row && !$error) {
+	$result = ($name == "" || queries("ALTER TABLE " . table($TABLE) . " DROP CHECK " . idf_escape($name)));
+	if (!$row["drop"] && $result) {
+		$result = queries("ALTER TABLE " . table($TABLE) . " ADD" . ($row["name"] != "" ? " CONSTRAINT " . idf_escape($row["name"]) . "" : "") . " CHECK ($row[clause])"); //! SQL injection
+	}
+	queries_redirect(
+		ME . "table=" . urlencode($TABLE),
+		($row["drop"] ? lang('Check has been dropped.') : ($name != "" ? lang('Check has been altered.') : lang('Check has been created.'))),
+		$result
+	);
+}
+
+page_header(($name != "" ? lang('Alter check') . ": " . h($name) : lang('Create check')), $error, array("table" => $TABLE));
+
+if (!$row) {
+	$checks = check_constraints($TABLE);
+	$row = array("name" => $name, "clause" => $checks[$name]);
+}
+?>
+
+<form action="" method="post">
+<p><?php echo lang('Name'); ?>: <input name="name" value="<?php echo h($row["name"]); ?>" data-maxlength="64" autocapitalize="off"><?php echo doc_link(array(
+	'sql' => 'create-table-check-constraints.html',
+	'mariadb' => 'constraint/',
+)); ?>
+<p><?php textarea("clause", $row["clause"]); ?>
+<p><input type="submit" value="<?php echo lang('Save'); ?>">
+<?php if ($name != "") { ?><input type="submit" name="drop" value="<?php echo lang('Drop'); ?>"><?php echo confirm(lang('Drop %s?', $name)); ?><?php } ?>
+<input type="hidden" name="token" value="<?php echo $token; ?>">
+</form>