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>
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