prevent Query error: Incorrect table name '' (1103). (#456)

Author: staabm

src/QueryReflection/QueryReflection.php

@@ -228,7 +228,11 @@ private function resolveQueryStringExpr(Expr $queryExpr, Scope $scope, bool $res
         if ($queryExpr instanceof Encapsed) {
             $string = '';
             foreach ($queryExpr->parts as $part) {
-                $string .= $this->resolveQueryStringExpr($part, $scope);
+                $resolvedPart = $this->resolveQueryStringExpr($part, $scope);
+                if (null === $resolvedPart) {
+                    return null;
+                }
+                $string .= $resolvedPart;
             }
 
             return $string;

tests/rules/data/syntax-error-in-prepared-statement.php

@@ -323,4 +323,9 @@ public function preparedNamedParamsSubstitution(Connection $connection)
     {
         $connection->preparedQuery('SELECT email FROM ada WHERE email = :param OR email = :parameter', ['param' => 'abc', 'parameter' => 'def']);
     }
+
+    public function bug442(Connection $conn, string $table)
+    {
+        $conn->executeQuery("SELECT * FROM `$table`");
+    }
 }

tests/rules/data/syntax-error-in-query-function.php

@@ -38,4 +38,9 @@ public function conditionalSyntaxError(\mysqli $mysqli)
 
         mysqli_query($mysqli, $query);
     }
+
+    public function bug442(\mysqli $mysqli, string $table)
+    {
+        mysqli_query($mysqli, "SELECT * FROM `$table`");
+    }
 }

tests/rules/data/syntax-error-in-query-method.php

@@ -117,4 +117,9 @@ public function conditionalSyntaxErrorInQueryUnion(PDO $pdo)
 
         $pdo->query('SELECT email, adaid FROM ada '.$add.' LIMIT 1', PDO::FETCH_ASSOC);
     }
+
+    public function bug442(PDO $pdo, string $table)
+    {
+        $pdo->query("SELECT * FROM `$table`");
+    }
 }