How to change a lot of items using php and mysql

Question

This is my items table in mysql

----------- -------------
|    id    |    k_id    |
----------- -------------
|    1     | 12,2,65,98 |
----------- -------------
|    2     | 2,5,77,234 |
----------- -------------
|    3     | 48,125,119 |
----------- -------------

And this table has 120000 rows.

now I want to change all values in k_id column like this one:

----------- ---------------------
|    id    |        k_id        |
----------- ---------------------
|    1     | "12","2","65","98" |
----------- ---------------------
|    2     | "2","5","77","234" |
----------- ---------------------
|    3     | "48","125","119"   |
----------- ---------------------

How can do this? Can do this using php? Can do this in phpmyadmin in cpanel?

please help me with best way.

Answer 1

没有检查，但是像这样

UPDATE tablename SET k_id = CONCAT('"', REPLACE(k_id, ',', '","'), '"')

Answer 2

UPDATE tablename SET k_id = CONCAT('"', REPLACE(k_id,',','","'), '"');

Answer 3

I'm assuming you want the data in separate strings like that so that you can use it in an IN() statement... its not necessary as MySQL has a method to handle that exact type of data (aka comma separated list)

SELECT id FROM table WHERE FIND_IN_SET('5', k_id) > 0;

this will return id 3.. however I would recommend you normalize your database... storing comma separated values is always a bad idea..

Normalize It!

CREATE TEMPORARY TABLE IF NOT EXISTS normalized_table AS 
(   SELECT
      id,
      SUBSTRING_INDEX(SUBSTRING_INDEX(k_id, ',', n.digit+1), ',', -1) column2
    FROM test
    JOIN(SELECT 0 digit UNION ALL SELECT 1 UNION ALL SELECT 2 UNION ALL SELECT 3 UNION ALL SELECT 4) n
        ON LENGTH(REPLACE(k_id, ',' , '')) <= LENGTH(k_id)-n.digit
    ORDER BY id, n.digit
);

DROP table test; -- test is just a dummy name for the name of your table
CREATE table test (id int, k_id int);
INSERT INTO test (id, k_id) 
SELECT id, k_id FROM normalized_table;

Answer 4

在MySQL中使用此Use Concat函数并替换函数

update TableName set k_id=CONCAT('"', REPLACE(',', '","', k_id, '"');

Answer 5

Another way would be to get all the values, do the string manipulation in PHP, and reinsert - but I like Cheery's way better. Though if you need to put your integers into strings in your database, it sounds like you might have a different problem somewhere else that could be addressed without changing all the values like this.

Answer 6

    try

UPDATE my_table SET k_id = CONCAT('"', REPLACE(k_id, ',', '","'), '"')

    UPDATE my_table SET  k_id = CONCAT( k_id, ", ", "999") ;

        //Use the function mysql CONCAT_WS() -> Concatenate With Separator

    UPDATE TABLE_NAME SET FIELD_NAME = CONCAT_WS(",",k_id)