更新一行，但如果 codeigniter 中不存在行，则插入 [英] Update a row, but insert if row doesn't exist in codeigniter

问题描述

我想在表中插入一行，如下所示:

I want to do an insert of row in a table, like this:

$this->db->update_batch($this->table_name, $update, 'image_id');

if ($this->db->affected_rows() === 0) {
    $this->db->insert_batch($this->table_name, $update);
}

但如果它存在我不想做任何事情.但是上面的这段代码插入了另一行，因为没有行受到影响

but if it exists I don't want to do anything. But this code above inserts another row because no row is affected

我想我可以做一个INSERT IGNORE INTO，但我更喜欢使用 CodeIgniters upate_batch 和 insert_batch.

I guess I could do a INSERT IGNORE INTO but I would prefer using CodeIgniters upate_batch and insert_batch.

$update - 变量类似于

$update = array(
   array('id' => 1, 'name' => 'Gustav'),
   array('id' => 2, 'name' => 'Peter'),
   array('id' => 3, 'name' => 'Lisa')
)

更新

根据我得到的答案，我对自己想要的东西不够清楚.(我认为我不够清楚我想要什么，所以这是我更新的问题，我希望它更清楚)

By the answers I get that I wasn't clear enough in what I wanted. (and I didn't think I was clear enough what I wanted so here is my updated question which I hope is clearer)

//This will insert Gustav, Peter and Lisa

$update = array(
   array('image_id' => 1, 'name' => 'Gustav'),
   array('image_id' => 2, 'name' => 'Peter'),
   array('image_id' => 3, 'name' => 'Lisa')
)
$this->db->insert_batch($update);


//If I do this it would insert Party Gustav, Peter and Lisa.
$update = array(
   array('image_id' => 1, 'name' => 'Party Gustav'),
   array('image_id' => 2, 'name' => 'Peter'),
   array('image_id' => 3, 'name' => 'Lisa')
)
$this->db->insert_batch($update);

//Above will create 6 rows

但我想要发生的是

$update = array(
   array('image_id' => 1, 'name' => 'Gustav'),
   array('image_id' => 2, 'name' => 'Peter'),
   array('image_id' => 3, 'name' => 'Lisa')
)
$this->db->insert_batch($update);

$update = array(
   array('image_id' => 1, 'name' => 'Party Gustav'),
   array('image_id' => 2, 'name' => 'Peter'),
   array('image_id' => 3, 'name' => 'Lisa')
)


//Insert batch but when existing image_ids just change the name 
//from Gustav to Party Gustav (in this case)
$this->db->insert_batch($update); 

//Above will create 3 rows

我想对于 insert_batch 来说，它等于 on key duplicate 之类的东西.

I guess it will equal to something like on key duplicate for insert_batch.

推荐答案

首先从表中选择所有 image_id.

$data = $this->db->select(`image_id`)->get($this->table_name)->result_array();

将 image_id 列出到一个数组中.

$image_ids=array();

foreach($data as $key => $value):

$image_ids[$key]=$value[`image_id`];

endforeach;

$update = array(
   array('image_id' => 1, 'name' => 'Party Gustav'),
   array('image_id' => 2, 'name' => 'Peter'),
   array('image_id' => 3, 'name' => 'Lisa')
)

检查 image_id 是否存在:

$update_query= $this->db->where_in(`image_ids`,$image_ids)
               ->get($this->table_name)->result();

if($update_query->num_rows() > 0):

  $this->db->update_batch($update,$this->table_name);//update if ids exist
else
   $this->db->insert_batch($update,$this->table_name);//insert if does not exist
endif;

这篇关于更新一行，但如果 codeigniter 中不存在行，则插入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！