sqlyog | 易学教程

MySQL's wait_timeout incorrect in SQLyog

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问题 Following this question, I set the following MySQL parameter in C:\Program Files\MySQL\MySQL Server 5.5\my.ini (the equivalent of Linux's my.cfg ): [mysqld] wait_timeout=2147483 After restarting Windows I used SQLyog to see the effect: SHOW SESSION VARIABLES LIKE 'wait_timeout' gave a result of 28800 SHOW GLOBAL VARIABLES LIKE 'wait_timeout' gave a result of 2147483 How come? I thought the global parameters are used as the default for each new session. 回答1: Bonus answer: I've gone through the

sqlyog export query result as csv

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问题 I'm using SQLyog and I was wonder if would be possible to export query result as csv? What I mean let's say I have query like SELECT * FROM wp_comments WHERE comment_post_ID = 902 and I would get back some rows what I would export as csv. Found it! Right click on the result table and use export! 回答1: In order to make it clear you can see this screenshot. 回答2: To export Query results as CSV with SqLYog is fairly simple: right click on table and export as desired. 来源： https://stackoverflow.com

Error No. 2003. Can't connect to mysql server

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问题 I has had two days searching and exploring solutions regarding the error 2003. Can't connect to mysql server on 'Server name'. The firewall is off and I had added the port 3306, the one that mysql uses. Any recommendation? 回答1: Please refer this FAQ which describes how to solve this issue: http://faq.webyog.com/content/23/15/en/error-no-2003-can_t-connect.html Error No. 2003: Can't connect to MySQL server on 'localhost' (or some other host) simply means that connection is not possible for one

Foreign key as Primary key

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问题 I designed tables like this: table1: students --------------------- PK id name number ... --------------------- table2: students_score --------------------- PK FK student_id math_score english_score ... --------------------- Question 1 If some students doesn't have scores at all, is it good table design? Question 2 If it's good design, then how can I make FK as PK in MySQL? I can't find out how. Everytime I try to make a relation like above SQLYog says this error: Can't create table 'students

Rearrange column order in Sqlyog

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问题 Is it possible to rearrange a table's column order in SQL yog? 回答1: Yes. Table / More Table Operations / Reorder Columns (ctrl shift r) 回答2: Column order is irrelevant to a database, so there isn't any benefit beyond readability to reorganizing column order. The only means of reordering a tables columns is to: Rename the current table to something else, like [tablename]_ORIG. A database won't allow identically named tables Create a new table with the column order you desire Copy the data from

How to on Performance_schema in mysql?

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问题 I want to turn performance_schema ON in mysql to collect statistics. How can I achieve this? 回答1: The following guide is linux-specific, but should easily be adaptable to windows. You have to check if the mysql server version you use, is compiled with support for it: mysqld --verbose --help | grep performance-schema If you can read something there, you are good to go. Enable it on server startup by putting into /etc/mysql/my.cnf [mysqld] performance_schema Afterwards do a service mysqld

关于SQLyog的问题

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以前就经常遇到SQLyog莫名其妙连接不上数据库的问题，今天学习分模块构建maven工程的时候又遇到了。由于东西是老东西但是形式是新的，需要创建很多模块、配置很多pom文件，很繁琐。当时项目跑得起来，tomcat也能部署项目，但是当访问controller跳转页面的时候就出问题了，浏览器一直转圈加载，当时我觉得是数据库或者连接池的问题，因为以前遇到过类似的情况，但是回到idea后发现控制台也没有报错，只有一行log4j的warning 写作：WARN No appenders could be found for logger (com.alibaba.druid.pool.DruidDataSource) 。下意识真的认为是连接池的原因，当时的这个问题困扰了我半个小时左右，百度后也没有头绪。当我重新热部署项目的时候又出现了新的问题，控制台开始疯狂报错。大概是在一直重复 this web application instance has been stopped already(XXXXXXX) 。这搞得我头又大了，从下午三点一直懵逼到吃晚饭，一直在检查pom文件。吃完晚饭觉得是自己之前建项目的时候添加了子模块依赖，后来觉得子模块建的不合适，就又给删掉重建了，但是发现原来删掉的子项目的依赖居然还在。当时以为是这个问题所以就重新建了一个项目

Error No. 2058 Plugin authentication_windows_client could not be loaded: The specified module could not be found

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问题 MySQL has a plugin that allows user authentication against current user’s Windows credentials. The plugin is ‘authentication_windows.dll’ . I get the following error message from SQLyog: Error No. 2058 Plugin authentication_windows_client could not be loaded: The specified module could not be found. The “authentication_windows_client” is a dll that is supposed to be loaded on the client side. Actually I think that SQLyog is looking for an older dll which has been replaced by MySQL with

SQL LIMIT by id column

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问题 I have the following statement: SELECT s.*, u.`fname`, u.`lname`, aif.`airport` FROM services s INNER JOIN airports_in_flight aif ON s.`id` = aif.`service_id` INNER JOIN users u ON s.`service_provider_id` = u.`id` Lets say for example that this is the result I am getting: id | ----- | ------ | ............... 1 | Jack | Jones | ............... 1 | Moses| Cohen | ............... 2 | Tom | Jones | ............... 3 | Luke | SkyWal | ............... So I need to use LIMIT 2 so that I will get

mysql安装与sqlyog安装

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首先是mysql安装，参考下面两个链接 https://www.cnblogs.com/gengyufei/p/11735358.html#_label4 https://www.jb51.net/article/167678.htm 如何检查是否安装成功呢，就是cmd窗口进入安装的bin文件夹，若net start mysql显示运行成功输入mysql -u root -p输入root密码进入数据库输入show databases; 注意分号必须输入就能看到目前运行的数据库情况了然后下载sql图形化界面工具SQLyog（之前有人推荐Navicat，但我发现我下的那个只能用sql server）建立新连接 hostaddress：localhost username：root password：mysql密码 post：3306 databases：先不填，因为如果填写了的话后面创建新的数据库就会无法显示成功连接之后如下图 ‘ 在菜单中选择DB->Create Database，输入database name其他默认即可创建新的数据库。在新建的数据库（例如mysql）中右键创建新的表输入field name，数据类型，长度，默认值，是否主键，是否自增长等参数就能成功创建表格了。最后成果是这样：后面会学习python将excel数据插入数据库和爬虫数据导入数据库 ’