PHP前端开发

将数据更新到 MySQL 数据库

百变鹏仔 3天前 #PHP
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通过 PHP 函数 mysql_query 执行 SQL UPDATE 语句,可以将数据更新到 MySQL 表中。下面是一个将记录更新到员工表中的简单示例。要更新任何表中的记录,需要使用条件子句来定位该记录。下面的示例使用主键来匹配员工表中的记录。

示例

尝试以下示例来了解更新操作。您需要提供员工 ID 才能更新员工工资。

<html>      <head>      <title>Update a Record in MySQL Database</title>   </head>      <body>      <?php         if(isset($_POST['update'])) {            $dbhost = 'localhost:3036';            $dbuser = 'root';            $dbpass = 'rootpassword';                        $conn = mysql_connect($dbhost, $dbuser, $dbpass);                        if(! $conn ) {               die('Could not connect: ' . mysql_error());            }                        $emp_id = $_POST['emp_id'];            $emp_salary = $_POST['emp_salary'];                        $sql = "UPDATE employee ". "SET emp_salary = $emp_salary ".                "WHERE emp_id = $emp_id" ;            mysql_select_db('test_db');            $retval = mysql_query( $sql, $conn );                        if(! $retval ) {               die('Could not update data: ' . mysql_error());            }            echo "Updated data successfullyn";                        mysql_close($conn);         }else {            ?>               <form method = "post" action = "<?php $_PHP_SELF ?>">                  <table width = "400" border =" 0" cellspacing = "1"                      cellpadding = "2">                                       <tr>                        <td width = "100">Employee ID</td>                        <td><input name = "emp_id" type = "text"                            id = "emp_id"></td>                     </tr>                                       <tr>                        <td width = "100">Employee Salary</td>                        <td><input name = "emp_salary" type = "text"                            id = "emp_salary"></td>                     </tr>                                       <tr>                        <td width = "100"> </td>                        <td> </td>                     </tr>                                       <tr>                        <td width = "100"> </td>                        <td>                           <input name = "update" type = "submit"                               id = "update" value = "Update">                        </td>                     </tr>                                    </table>               </form>            <?php         }      ?>         </body></html>