我有以下查询,用于从预购遍历数据库中插入和删除记录。我正在使用codeigniter,不知道如何在其中激发多个查询。我尝试了以下查询,但在codeigniters中没有正确激发,而是使用phpmyadmin正确激发。
查询是否将记录插入数据库:
$level = $_GET['level'] + 1;
$rgt = $_GET['rgt'] + 1;
if ($_GET['level'] == 0) {
$sql = "UPDATE xp_subunit SET lft = lft+2, rgt=rgt+2 WHERE rgt > " . $_GET['rgt'] . "; ";
$sql .="INSERT INTO xp_subunit SET level=" . $level . ", lft =" . $_GET['rgt'] . ", rgt = " . $rgt . " , name = '" . $_GET['name'] . "', unit_id='" . $_GET['unit_id'] . "', description='" . $_GET['description'] . "';";
echo $sql;
} else {
$sql = "UPDATE xp_subunit SET rgt = rgt+2 WHERE rgt > " . $_GET['lft'] . "; ";
$sql .="INSERT INTO xp_subunit SET level=" . $level . ", lft =" . $_GET['rgt'] . ", rgt = " . $rgt . " , name = '" . $_GET['name'] . "', unit_id='" . $_GET['unit_id'] . "', description='" . $_GET['description'] . "';";
echo $sql;
}
echo $query = $this->db->insert($this->tablename, $sql);
从数据库中删除记录的查询:
$sql .= "SELECT @myLeft := " . $_GET['lft'] . ", @myRight := " . $_GET['rgt'] . ", @myWidth := " . $_GET['lft'] . " - lft + 1
FROM xp_subunit WHERE id =" . $_GET['id'] . "; ";
$sql .= "DELETE FROM xp_subunit WHERE lft BETWEEN @myLeft AND @myRight; ";
$sql .= "UPDATE xp_subunit SET rgt = rgt - @myWidth WHERE rgt > @myRight; ";
$sql .= "UPDATE xp_subunit SET lft = lft - @myWidth WHERE lft > @myRight; ";
echo $query = $this->db->mysqli_multi_query($sql);
以上查询有什么问题?
有可用的批量更新和插入功能-请参阅下面的
$data = array(
array(
'title' => 'My title' ,'name' => 'My Name 2' , 'date' => 'My date 2'
),
array(
'title' => 'Another title' ,'name' => 'Another Name 2' , 'date' => 'Another date 2'
)
);
$this->db->update_batch('mytable', $data, 'title');
// Produces:
// UPDATE `mytable` SET `name` = CASE
// WHEN `title` = 'My title' THEN 'My Name 2'
// WHEN `title` = 'Another title' THEN 'Another Name 2'
// ELSE `name` END,
// `date` = CASE
// WHEN `title` = 'My title' THEN 'My date 2'
// WHEN `title` = 'Another title' THEN 'Another date 2'
// ELSE `date` END
// WHERE `title` IN ('My title','Another title')
插入
$this->db->insert_batch('mytable', $data);
还有$this->db->query()函数可用$this->db->query('YOUR QUERY HERE');
To Update and Insert - You'll need to execute them separately
//更新
$data = array(
'title' => $title,'name' => $name,'date' => $date);
$this->db->where('id', $id);
$this->db->update('mytable', $data);
//插入
$data = array(
'title' => 'My title' ,'name' => 'My Name' ,'date' => 'My date');
$this->db->insert('mytable', $data);
//删除
$this->db->delete('mytable', array('id' => $id));
请注意
使用而不是$_GET
$this->input->get(NULL, TRUE); // returns all GET items with XSS filter
或
$this->input->get('some_data', TRUE);
参考编号:http://codeigniter.com/user_guide/database/active_record.html
http://codeigniter.com/user_guide/libraries/input.html
除了潜在的sql注入($_GET['…'])之外,在第一个查询中使用$this->db->insert()。这是失败的,因为insert()是ActiveRecord库的一部分,用于构造查询,而不是执行查询。
至于为什么mysqli_multi_query失败,我不知道。然而,我建议不要使用任何驱动程序特定的函数,因为Code Igniter允许您从数据库中进行抽象。因此,您应该使用$this->db->query()分别执行每个查询。
话虽如此,我强烈建议使用ActiveRecord。它允许您编写查询,而不必担心数据库之间的小语法差异。此外,它会自动转义输入。
编辑
第一个更新查询是:
$this->db->set('lft', 'lft+2', false);
$this->db->set('rgt', 'rgt+2', false);
$this->db->where('rgt >', $_GET['rgt']);
$this->db->update('xp_subunit');
第一个插件:
$this->db->set('level', $level);
$this->db->set('lft', $_GET['rgt']);
...
$this->db->insert('xp_subunit');
等等。(查看文档)
可用的是已使用的批更新和插入功能。代码点火器的使用指南将帮助您。尝试以下链接:
http://codeigniter.com/user_guide/database/active_record.html