Batch_update主键联接表

Question

i'm having a problem with batch update function with codeigniter, i'm using a joining table for my products and categories, as I have a many to many relationship. I have searched high and low for an answer but still nothing so i have come here to ask more senior technicians for help.

I have 2 columns in a table "product_category" with "product_id" & "category_id" so I can link 1 product to many categories. I have managed to perform the insert query which inserts all the id's fine, but the update is not working. Here's my code:

model:

 function update_product_cat($product, $cat_id) { $data = array(); foreach( $product as $index => $value ) { $data[] = array( 'product_id' => $value , 'category_id' => $cat_id[ $index ] ); } $this->db->update_batch('product_category', $data, 'product_id'); } 

array:

 Array ( [0] => Array ( [product_id] => 327 [category_id] => 3 ) [1] => Array ( [product_id] => 327 [category_id] => 5 ) [2] => Array ( [product_id] => 327 [category_id] => 7 )) 

My error code:

Error Number: 1062

Duplicate entry '327-3' for key 'PRIMARY' UPDATE product_category SET category_id = CASE WHEN product_id = '327' THEN '3' WHEN product_id = '327' THEN '5' WHEN product_id = '327' THEN '7' ELSE category_id END WHERE product_id IN ('327','327','327') Any help would be greatly appreciated:

thanks

Answer 1

I'm not 100% sure this is your entire problem, but it looks like the product_category table has product_id set as a primary key - where it looks like you are trying to enter many identical product_id's. If that were the case you should probably just be using a regular update not batch, not to mention removing/replacing the primary key.