Question

var form = document.getElementById('some_form')
form.addEventListener('submit', function (event) {
  console.log('Form elements', form.elements)
  event.preventDefault()
  // Do your Chrome Storage stuff here with form elements
})

Answer 1

请注意， mysql _ 已弃用，但您可以使用限制：

mysql_query("DELETE FROM l2 WHERE
data IN ( 
   SELECT Top 10  data
   FROM l2
   ORDER BY data desc
   LIMIT 10
)", $con);

Answer 2

正如其他人所提到的，你真的应该使用更现代的扩展来连接MySQL数据库。 PDO是一个不错的选择：

<?php
$dbConn = new \PDO(
    'mysql:host=localhost;dbname=my_db;charset=utf8',
    'user',
    'password',
    [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION]
);

$sql = <<<SQL
DELETE FROM l2 WHERE data NOT IN (
    SELECT data FROM (SELECT data FROM l2 ORDER BY data DESC LIMIT 10) d
)
SQL;

$dbConn->exec($sql);

Answer 3

<?php

$dbh = new PDO('mysql:host=localhost;dbname=deletelimit10', "root", "");

$query = $dbh->query("DELETE FROM content
WHERE
  name NOT IN (
    SELECT * FROM (
      SELECT name
      FROM content
      ORDER BY name DESC
      LIMIT 10) k
  )"); // Run your query

?>

运行complet PDO后，我们只有10行。

完成PDO：

$attributes = array(
            'config' => array(
                'conditions' => array()
            ),
            "effects" => array(array(
                "attributes" => array(array(
                    'attribute_id' => "comment.value",
                    'label' => "Comment",
                    'required' => true,
                    'substitutions' => array(),
                    'type' => "text",
                    'value' => "This is a test comment from flow"
                )),
                'type' => "comment.create",
            )),
            'name' => 'Test Flow via API',
            'type' => 'item.create'
        );

这＆＃34; k＆＃34;是：每个派生表（AKA子查询）必须确实有一个别名。即括号中的每个查询都必须给出一个别名（AS无论如何），可以用来在外部查询的其余部分中引用它。我的表名是＆＃34; name＆＃34;表中的列名称为＆＃34; name＆＃34;。

如何使用Sql从表中删除前10行

3 个答案: