MySQLi - Warning Count

语法

int mysqli_warning_count ( mysqli $link )

定义和用法

它返回给定链接的最后一次查询的警告数量

示例

尝试以下示例 −

<?php
   $servername = "localhost:3306";
   $username = "root";
   $password = "";
   $dbname = "TUTORIALS";
   $conn = new mysqli($servername, $username, $password, $dbname);

   if (!$conn->real_connect($servername, $username, $password, $dbname)) {
      die('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
   }
   echo "Database connected";
   mysqli_query($conn, "CREATE TABLE send18 LIKE tutorials_auto");
   $query = "INSERT INTO myCity (id,name) VALUES(
      1,'Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch')";

   mysqli_query($conn, $query);

   if (mysqli_warning_count($conn)) {
      if ($result = mysqli_query($conn, "SHOW WARNINGS")) {
         $row = mysqli_fetch_row($result);
         printf("%s (%d): %s
", $row[0], $row[1], $row[2]);
         mysqli_free_result($result);
      }
   }

   mysqli_close($conn);
?>

mysqli_useful_functions.html