Updating multiple rows in mysql Skype sex chat online paypal

Posted by / 06-Dec-2019 11:39

As My SQL doesn’t have inherent support for updating more than one rows or records with a single update query as it does for insert query, in a situation which needs us to perform updating to tens of thousands or even millions of records, one update query for each row seems to be too much.Reducing the number of SQL database queries is the top tip for optimizing SQL applications.So, we should create another column with user’s list view for checkbox input.

The result is that col1 and col2 have the same value. UPDATE t1 SET col1 = col1 1, col2 = col1; select now(); select now(), sleep(10), now(); select now(); --------------------- | now() | --------------------- | 2018-11-05 | --------------------- 1 row in set (0.00 sec) --------------------- ----------- --------------------- | now() | sleep(10) | now() | --------------------- ----------- --------------------- | 2018-11-05 | 0 | 2018-11-05 | --------------------- ----------- --------------------- 1 row in set (10.00 sec) --------------------- | now() | --------------------- | 2018-11-05 | --------------------- 1 row in set (0.00 sec) This way you can use the variables as many times as you can, not only in mysql statements but also in the server-side scripting-language(like PHP) you are using in your project.By iterating over this multidimensional array, each user record will be updated by setting current iteration values to My SQL UPDATE query.After successful update, the page will be redirected to list view by using PHP location header. Because we need not show any user interface and it requires only the array of selected row ids.With these steps, we should make little changes on list_and edit_For each users row, we need to add checkbox input while iterating over a loop with the query result.

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For multi-row delete also we are submitting selected rows by using Javascript.

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