mysql

SQL Query to return filters applicable to products contained in category AND filters that apply from remaining products once 1+ filters active

由 天涯浪子 提交于 2021-02-11 14:01:01
问题 I'm displaying a list of product filters. Product filters are only displayed if they are applicable to the products contained within a chosen category. I want to expand that further so once a filter has been activated, the non-applicable filters are not outputted. So from the data sample below in products_filters_to_products: Once Orange has been selected as a Colour Only Small from Size should be made available Query so far returns applicable filter categories, filters belonging to those

Implementing Spilover system in mlm binary plan to join a user on last available child on selected side

由 懵懂的女人 提交于 2021-02-11 13:59:24
问题 I am new to PHP, MySQL and I was practicing on a binary MLM project. The problem is, I want to implement spillover system in this MLM system so that if root user of the tree already has two child "LEFT" & "RIGHT" and if he refers another user to left then it should go to the left empty child's left side and if he refers the new user to right then it should go to the right empty child's right side. I have tried many function examples from StackOverflow and other resources but I didn't find the

Implementing Spilover system in mlm binary plan to join a user on last available child on selected side

由 ﹥＞﹥吖頭↗ 提交于 2021-02-11 13:58:18
问题 I am new to PHP, MySQL and I was practicing on a binary MLM project. The problem is, I want to implement spillover system in this MLM system so that if root user of the tree already has two child "LEFT" & "RIGHT" and if he refers another user to left then it should go to the left empty child's left side and if he refers the new user to right then it should go to the right empty child's right side. I have tried many function examples from StackOverflow and other resources but I didn't find the

Get every n-hour data from database with tolerance

由 笑着哭i 提交于 2021-02-11 13:56:41
问题 I have a MySQL database in which I write data every 10 minutes. i.e.: +---------------------+ | datetime | +---------------------+ | 2018-09-03 13:01:49 | | 2018-09-03 12:51:49 | | 2018-09-03 12:41:49 | +---------------------+ In my Python code I want to get just rows which are "exactly" n-hour old, i.e.: +---------------------+ | datetime | +---------------------+ | 2018-09-03 13:01:49 | | 2018-09-03 12:01:49 | | 2018-09-03 11:01:49 | | 2018-09-03 10:01:49 | | 2018-09-03 09:01:49 | | 2018-09

Java工程师必备书单

由 会有一股神秘感。 提交于 2021-02-11 13:54:45
本文出自我的公众号：程序员江湖。 江湖路险，你我同行。 Java开发工程师一般负责后端开发，当然也有专门做Java Web的工程师，但是随着前后端的分离，越来越多的Java工程师需要往大后端方向发展。 今天我们就来介绍一下Java后端开发者的书单。 首先要感谢一下江南白衣大大的后端书架，让我在初学阶段读到了很多好书，直到现在都印象深刻。 我在两年的学习历程中看了很多的书，其中不乏XXX入门到精通，XXX王者归来，XXX指南什么的。 虽然这类书确实毛病很多，但是作为非科班的我来说，当时还是看的津津有味。直到后来我看到一些优秀的书籍，以及白衣哥的书架，我才逐渐认识到看一些精品书籍的好处。 所以我们今天就从这些精品书籍中挑选一些优秀书籍来推荐给大家，当然其中有一些书我自己也没有时间看完。 接下来我们按照后端技术栈各个部分的内容来推荐书籍。 网络 1 TCP/IP卷一 这本其实我刚开始没看太懂，可能是当时太水的原因，但是一般是大牛力荐的书。 2 计算机网络：自顶向下 这本从应用层讲到物理层，感觉这种方式学起来更轻松，我比较推荐小白看这本。 3 图解HTTP和图解TCP/IP 相较于前两本大厚书，这两本书更加亲民，小白可以买来看看，还是很适合入门的。 4 计算机网络 没错，就是这本教材，作为非科班选手自己看这本书，那叫一个欲仙欲死啊，看完就忘记了。 操作系统 1 深入理解计算机系统

knex migration fail, but doesnt revert changes

由 六眼飞鱼酱① 提交于 2021-02-11 13:54:07
问题 I want to use knex in my ts project. migration looks like this: export async function up(knex: Knex): Promise<any> { return knex.schema.createTable('first_table', (t) => { t.integer('first_table_id').primary(); }).createTable('second_table', (t) => { t.integer('id'); // simulation sql error, duplicate in this case. t.integer('id'). }) } Migration already fail. I wait transaction rollback for all changes but i have successfully created first_table. I do not understand something or Knex behaves

How to implement Roll Back Transaction and Error Message in MYSQL

由 血红的双手。 提交于 2021-02-11 13:53:59
问题 I Have sample procedure . CREATE PROCEDURE `sample_procedure ` ( IN IDIn bigint(20), IN MainIDIn bigint(20), IN NameIn varchar(20) ) READS SQL DATA DETERMINISTIC BEGIN INSERT INTO tbl_DEPT ( ID, Name) Select 1,'Mohan'; IF NOT EXISTS (SELECT ID FROM tbl_emp te WHERE te.ID = IDIn) THEN INSERT INTO tbl_emp ( MainID, Name) VALUES (MainIDIn, NameIn); ELSE IF EXISTS (SELECT ID FROM tbl_emp te WHERE te.ID = IDIn) THEN UPDATE tbl_emp set MainID =MainIDIn, name = NameIn WHERE te.ID= IDIn; END IF; END

MySQL - Avoid to select, and update, the same record on repeatable_read

由 巧了我就是萌 提交于 2021-02-11 13:52:46
问题 i'm developping a PHP service that need to get a unique TOKEN from a MySQL table. The table is like: ID TOKEN ID_PROCESS 1 AAAAA 0 2 BBBBB 0 3 CCCCC 0 The table has millions of records with already generated TOKEN. I need to be extra sure that, for example, the record with ID = 1 is selected and then updated ( UPDATE table set ID_PROCESS = 123 WHERE ID = 1) from one user and that nobody else could select it and then update it overwriting the former update. For selecting an available TOKEN i

MySQL - Avoid to select, and update, the same record on repeatable_read

由 半城伤御伤魂 提交于 2021-02-11 13:51:21
问题 i'm developping a PHP service that need to get a unique TOKEN from a MySQL table. The table is like: ID TOKEN ID_PROCESS 1 AAAAA 0 2 BBBBB 0 3 CCCCC 0 The table has millions of records with already generated TOKEN. I need to be extra sure that, for example, the record with ID = 1 is selected and then updated ( UPDATE table set ID_PROCESS = 123 WHERE ID = 1) from one user and that nobody else could select it and then update it overwriting the former update. For selecting an available TOKEN i

How to implement Roll Back Transaction and Error Message in MYSQL

由 谁都会走 提交于 2021-02-11 13:51:04
问题 I Have sample procedure . CREATE PROCEDURE `sample_procedure ` ( IN IDIn bigint(20), IN MainIDIn bigint(20), IN NameIn varchar(20) ) READS SQL DATA DETERMINISTIC BEGIN INSERT INTO tbl_DEPT ( ID, Name) Select 1,'Mohan'; IF NOT EXISTS (SELECT ID FROM tbl_emp te WHERE te.ID = IDIn) THEN INSERT INTO tbl_emp ( MainID, Name) VALUES (MainIDIn, NameIn); ELSE IF EXISTS (SELECT ID FROM tbl_emp te WHERE te.ID = IDIn) THEN UPDATE tbl_emp set MainID =MainIDIn, name = NameIn WHERE te.ID= IDIn; END IF; END
订阅 mysql