Php Mysql 简明教程

PHP & MySQL - Update Records Example

PHP 使用 mysqli query() 或 mysql_query() 函数来更新 MySQL 表中的记录。此函数接收两个参数，成功时返回 TRUE，失败时返回 FALSE。

PHP uses mysqli query() or mysql_query() function to update records in a MySQL table. This function takes two parameters and returns TRUE on success or FALSE on failure.

Syntax

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

Sr.No.

Parameter & Description

1

$sql Required - SQL query to update records in a MySQL table.

2

$resultmode Optional - Either the constant MYSQLI_USE_RESULT or MYSQLI_STORE_RESULT depending on the desired behavior. By default, MYSQLI_STORE_RESULT is used.

Example

尝试使用以下示例来更新表中的记录-

Try the following example to update a record in a table −

将以下示例复制粘贴为 mysql_example.php：

Copy and paste the following example as 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>

Output

访问在 apache web 服务器上部署的 mysql_example.php，并验证输出。在运行选择脚本之前，我们在此表中输入了多条记录。

Access the mysql_example.php deployed on apache web server and verify the output. Here we’ve entered multiple records in the table before running the select script.

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