mariadb

Unrecognized statement type. (near “WITH” at position 0)

由 梦想的初衷 提交于 2020-01-06 05:22:06
问题 I'm using mysql phpmyadmin, version 10.1.34-maraiDB. i cant execute the folling cte code. the code error shown when i run the code WITH cte (Employee_ID, First_Name, Last_Name,Email, Phone, Hire_Date, Manager_ID, Job_Title) AS ( SELECT Employee_ID, First_Name, Last_Name,Email, Phone, Hire_Date, Manager_ID, Job_Title FROM employees ) SELECT * FROM cteEmp; 回答1: The WITH common table expression clause is only supported starting with MariaDB version 10.2.1 . From the documentation: Common Table

what does “Not a PersistText value” mean?

由 半城伤御伤魂 提交于 2020-01-06 02:11:11
问题 I'm new to yesod and I'm trying to make the same blog project from this screencast: https://www.youtube.com/watch?v=SadfV-qbVg8 with the only difference being that I'm using MariaDB instead of PostgreSQL. Every time I add a new blog post and redirect to the page that shows it I see this error: [Error#yesod-core] get BlogPostKey {unBlogPostKey = SqlBackendKey {unSqlBackendKey = 5}}: field article: Not a PersistText value @(yesod-core-1.4.12:Yesod.Core.Class.Yesod ./Yesod/Core/Class/Yesod.hs

what does “Not a PersistText value” mean?

由 折月煮酒 提交于 2020-01-06 02:10:23
问题 I'm new to yesod and I'm trying to make the same blog project from this screencast: https://www.youtube.com/watch?v=SadfV-qbVg8 with the only difference being that I'm using MariaDB instead of PostgreSQL. Every time I add a new blog post and redirect to the page that shows it I see this error: [Error#yesod-core] get BlogPostKey {unBlogPostKey = SqlBackendKey {unSqlBackendKey = 5}}: field article: Not a PersistText value @(yesod-core-1.4.12:Yesod.Core.Class.Yesod ./Yesod/Core/Class/Yesod.hs

数据库介绍与分类

由 匆匆过客 提交于 2020-01-06 00:30:57
第1章 数据库介绍与分类 1.1 数据库介绍 什么是数据库 简单的说，数据库就是一个存放计算机数据的仓库，这个仓库是按照一定的数据结构（数据结构是指数据的组织形式或数据之间的联系）来对数据进行组织和存储的，我们可以通过数据库提供的多种方法来管理其中的数据。 1.2 数据库的种类 按照早期的数据库理论，比较流行的数据库模型有三种，分别为层次式数据库、网状数据库和关系型数据库。而在当今的互联网企业中，最常用的数据库模式主要有两种，即关系型数据库和非关系型数据库。 1.2.1 关系型数据库介绍 （1）关系型数据库由来 虽然网状数据库和层次数据库已经很好地解决了数据的集中和共享问题，但是在数据独立和抽象级别上仍有很大欠缺。用户在对这两种数据库进行存取时，仍然需要明确数据的存储结构，指出存取路径。而关系数据库就可以比较好地解决这些问题。 （2）关系型数据库介绍 关系型数据库模型是把复杂的数据结构归结为简单的二元关系（即二维表格形式）。在关系型数据库中，对数据的操作几乎全部建立在一个或多个关系表格上，通过这些关联的表格分类、合并、连接或选取等运算来实现数据的管理。 关系型数据库诞生距今已有40多年了，从理论产生到发展到实现产品，例如：常见的MySQL和Oracle数据库，oracle在数据库领域里上升到了霸主地位，形成每年高达数百亿美元的庞大产业市场，而MySQL也是不容忽视的数据库

简单web架构实例应用

由 拥有回忆 提交于 2020-01-05 10:57:58
一、架构图 dns完成解析web1,web2来实现负载均衡 web1,web2使用后台的mysql数据库 web1,web2的页面数据全部放在nfs数据上，实现自动挂载 nfs服务器为web1,web2提供网页数据 10.7.2. 准备工作 设置ip信息 nmcli con add ifname ens33 con-name ens33 type ethernet ipv4.method manual \ ipv4.address 192.158.46.150/24 ipv4.gateway 192.168.46.1 Note 我使用的nmcli修改的ip，当然也是可以手工修改的。 10.7.3. ansible的配置 10.7.3.1. 安装ansible [root@localhost ~]# yum install ansible 10.7.3.2. 添加主机 需要添加如下内容到/etc/ansible/hosts文件中去。 [client] 192.168.46.159 [dns] 192.168.46.158 [web] 192.168.46.157 192.168.46.156 [db] 192.168.46.155 [nfs] 192.168.46.154 [self] 192.168.46.150 10.7.3.3. 配置免密码登陆

MariaDB Error creating Function when it worked on MySQL

由 泄露秘密 提交于 2020-01-05 08:43:56
问题 Please consider the following function defination. I created and set it up on MySQL 5.1 but it's failing in MariaDB 5.5 CREATE DEFINER=`root`@`127.0.0.1` FUNCTION `weighted_mean_by_kpi`(`KPIID` INT, `employee_id` INT, `date` DATE) RETURNS decimal(6,3) LANGUAGE SQL DETERMINISTIC READS SQL DATA SQL SECURITY DEFINER BEGIN DECLARE done INT DEFAULT 0; DECLARE rating_number INT DEFAULT 0; DECLARE rating_count INT DEFAULT 0; DECLARE rating_total INT DEFAULT 0; DECLARE weighted_total DOUBLE DEFAULT 0

MariaDB Error creating Function when it worked on MySQL

由 ≡放荡痞女 提交于 2020-01-05 08:41:23
问题 Please consider the following function defination. I created and set it up on MySQL 5.1 but it's failing in MariaDB 5.5 CREATE DEFINER=`root`@`127.0.0.1` FUNCTION `weighted_mean_by_kpi`(`KPIID` INT, `employee_id` INT, `date` DATE) RETURNS decimal(6,3) LANGUAGE SQL DETERMINISTIC READS SQL DATA SQL SECURITY DEFINER BEGIN DECLARE done INT DEFAULT 0; DECLARE rating_number INT DEFAULT 0; DECLARE rating_count INT DEFAULT 0; DECLARE rating_total INT DEFAULT 0; DECLARE weighted_total DOUBLE DEFAULT 0

Unable to complete SST transfer due to “WSREP: SST position can't be set in past.” error

由 随声附和 提交于 2020-01-05 08:36:07
问题 I am using "MariaDB 10.3.8" and "MariaBackup" for state transfer.wsrep_sst_method=Mariabackup. I have a donor node and "galera_new_cluster" is running. I want to add another node(joiner) to the cluster. After the mariabackup SST transfer finishes, I receive the error as follows WSREP: SST position can't be set in past. What's kind of error is this? How can I solve this? here is the log Joiner: 2019-02-13 9:57:54 0 [Note] WSREP: Signalling provider to continue. 2019-02-13 9:57:54 0 [Warning]

How to alter INFORMATION_SCHEMA or add triggers or foreign keys to it?

由 孤街醉人 提交于 2020-01-05 08:01:34
问题 I'm trying to create some meta-data to extend mysql functionality but I can't create tables in the database INFORMATION_SCHEMA. I thought that I could just create another database and have my metadata in there but I need some foreign keys from my tables to some tables in the INFORMATION_SCHEMA DB. Nevertheless, I get errors when trying to create them. Then I thought I could create a trigger to get notified of changes but since triggers are associated to a table and I can't alter that database

How to determine start/end time for events from status logs stored every 2 minutes

由 大城市里の小女人 提交于 2020-01-05 03:48:11
问题 MariaDB version: version: 10.0.38-MariaDB-0+deb8u1 I have a table where every 2 minutes is reported the status for a device (ON/OFF) with it's timestamp in unix time. select * from devices_stats where device_id = 'LivingLight' AND timestamp BETWEEN 1570080242 AND 1570084922; +-------+-------------+--------+------------+-------------+ | id | device_id | status | timestamp | device_iddr | +-------+-------------+--------+------------+-------------+ | 16416 | LivingLight | OFF | 1570080242 | 1 |
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