MySQLi - 字段计数

语法

int mysqli_field_count ( mysqli $link )

定义和用法

它会返回最近一次查询的列数。

范例

尝试一下以下范例 −

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

   if ($conn->connect_error) {
      die('Connect Error (' . mysqli_connect_errno() . ') '. mysqli_connect_error());
      exit();
   } 
   if (!mysqli_query($conn, "SET a = 1")) {
      printf("Errorcode: %d\n", mysqli_error($conn));
   }
   echo 'Success... ' . mysqli_get_host_info($conn) . "\n";
   mysqli_dump_debug_info($conn);
   mysqli_autocommit($conn,FALSE);
   mysqli_query($conn,"SELECT * FROM tutorials_auto");
   mysqli_field_count($conn);
   mysqli_commit($conn);
   
   mysqli_close($conn);
?>

上述代码的样例输出应该如下所示 −

Errorcode: 0 Success... localhost:3306 via TCP/IP