PHP & MySQL – 更新记录示例

PHP & MySQL – 更新记录示例


PHP 使用mysqli query()mysql_query()函数来更新 MySQL 表中的记录。此函数采用两个参数,成功时返回 TRUE,失败时返回 FALSE。

句法

$mysqli->query($sql,$resultmode)

Sr.No. 参数及说明
1

$sql

必需 – 用于更新 MySQL 表中记录的 SQL 查询。

2

$resultmode

可选 – 常量 MYSQLI_USE_RESULT 或 MYSQLI_STORE_RESULT 取决于所需的行为。默认情况下,使用 MYSQLI_STORE_RESULT。

例子

尝试以下示例来更新表中的记录 –

将以下示例复制并粘贴为 mysql_example.php –

<html>
   <head>
      <title>Updating MySQL Table</title>
   </head>
   <body>
      <?php
         $dbhost = 'localhost';
         $dbuser = 'root';
         $dbpass = 'root@123';
         $dbname = 'TUTORIALS';
         $mysqli = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
         
         if($mysqli->connect_errno ) {
            printf("Connect failed: %s<br />", $mysqli->connect_error);
            exit();
         }
         printf('Connected successfully.<br />');
		 
         if ($mysqli->query('UPDATE tutorials_tbl set tutorial_title = "Learning Java" where tutorial_id = 4')) {
            printf("Table tutorials_tbl updated successfully.<br />");
         }
         if ($mysqli->errno) {
            printf("Could not update table: %s<br />", $mysqli->error);
         }
   
         $sql = "SELECT tutorial_id, tutorial_title, tutorial_author, submission_date FROM tutorials_tbl";
		 
         $result = $mysqli->query($sql);
           
         if ($result->num_rows > 0) {
            while($row = $result->fetch_assoc()) {
               printf("Id: %s, Title: %s, Author: %s, Date: %d <br />", 
                  $row["tutorial_id"], 
                  $row["tutorial_title"], 
                  $row["tutorial_author"],
                  $row["submission_date"]);               
            }
         } else {
            printf('No record found.<br />');
         }
         mysqli_free_result($result);
         $mysqli->close();
      ?>
   </body>
</html>

输出

访问部署在 apache web 服务器上的 mysql_example.php 并验证输出。在这里,我们在运行选择脚本之前在表中输入了多条记录。

Connected successfully.
Table tutorials_tbl updated successfully.
Id: 1, Title: MySQL Tutorial, Author: Mahesh, Date: 2021
Id: 2, Title: HTML Tutorial, Author: Mahesh, Date: 2021
Id: 3, Title: PHP Tutorial, Author: Mahesh, Date: 2021
Id: 4, Title: Learning Java, Author: Mahesh, Date: 2021
Id: 5, Title: Apache Tutorial, Author: Suresh, Date: 2021

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