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  • 1、check the manual that corresponds to your MySQL server version for the right syntax to use near ') 语法错误: `turn` TINYINT(2) NULL DEFAULT NULL,  PRIMARY KEY (`id`)  )

    1、check the manual that corresponds to your MySQL server version for the right syntax to use near ')

    语法错误:  `turn` TINYINT(2) NULL DEFAULT NULL,
               PRIMARY KEY (`id`)
                       )COLLATE='utf8_general_ci'
    第二行没有逗号。
    展开全文
  • 信了如下几个报错的邪 ... “Access denied for user 'root'@'localhost'” ...“mysqladmin: connect to server at 'localhost' failed” “mysqladmin: Can't turn off logging; error: 'Access denied; you need (...

    信了如下几个报错的邪

    mysqladmin更改密码无效

    “Access denied for user 'root'@'localhost'”

    “mysqladmin: connect to server at 'localhost' failed”

    “mysqladmin: Can't turn off logging; error: 'Access denied; you need (at least one of) the SUPER privilege(s) for this operation'”

    背景:centos6.10中安装5.5.62

    解决方法:

    1.kill pid         #结束数据库进程

     2.vi /data/3307/mysql        

    #启动文件文件中配置--skip-grant-tables,注释掉mysql_pwd="oldboy123",不需修改my.cnf文件

    3. /data/3307/mysql start

    netstat –lntup

    #启动数据库并检查

    4. mysql -uroot -S /data/3307/mysql.sock       #进入mysql,不要带-p

    执行下面的句子

    mysql>use mysql;

    mysql>delete from user where user='';

    mysql>delete from user where host='localhost.localdomain';

    mysql>update user set password=password('oldboy123') where user='root';

    mysql>update user set host='%' where user='root';   

    #如果报错 ERROR 1062 (23000): Duplicate entry '%-root' for key 'PRIMARY' 不予理会

    mysql>quit;

    5./data/3307/mysql stop       #如果要输入密码,直接enter或者输入'oldboy123'

    6.vi /data/3307/mysql        #删除第1步加入的--skip-grant-tables

    7. /data/3307/mysql start

    netstat –lntup

    #启动数据库并检查

    8. mysql -uroot -S /data/3307/mysql.sock      #确认不需密码是否无法登录

    9. mysql -uroot -p -S /data/3307/mysql.sock   #登录数据库,密码'oldboy123'

     

    /3307/注意替换!

    参考文件:

    https://blog.51cto.com/holy2010/684117

     

    展开全文
  • <p>and these are the pages for the two server-side functions: <p><strong>delete.php</strong></p> <pre><code><?php $servername = "localhost"; $username = "root"; $password = ""; $dbname = "depits...
  • <p>When I submit a variable into a form and submit it to a PHP file which is in turn connected to MySQL server, this happens: <pre><code>Notice: Use of undefined constant project - assumed 'project' ...
  • // turn emulated prepares off $pdo->setAttribute(PDO::ATTR_DEFAULT_FETCH_MODE,PDO::FETCH_ASSOC); // set default fetch mode to assoc so that you don't have to explicitly list the fetch mode every ...
  • <p>I am trying to extract a filepath of an image from a MySQL database and turn it into a URL. However when I pass it through str_replace no changes are been made. I have set up a test document with a...
  • <p>My issue is when the user tries to turn "on" 2 switches. The second switch does not end up in my database but when they only turn on 1 of them separately, they all end up in the right database like...
  • I guess I could turn this into array, but it is still confusing how do I do it and how to make the php string to correctly put everything into right MySQL database tables.</p> <p>Edit: I have some ...
  • <p>What I am trying to do is turn this into an argument. Somewhat like this(this is an example, please don’t judge). <p>PHP:</p> <pre><code>function getLayers(){ $my_layer_string="MyMap_".mb_...
  • This is all on the server side, Linux. The only unique value is the ID, and depending on the number of the ID the webpage will change accordingly. <p>For example: <p>ID: 1, Color: Red. <p>ID: 2, ...
  • This question is sent to a server which in turn sends it to my e-mail. I respond to the question and the response gets sent back to the server. The response is stored in a MySQL database. The user ...
  • So I decided to turn to you all for help. It seems like it should be a simple solution to me but I cannot find it so maybe fresh eyes will help. So here it is I hope someone may be able to assist me....
  • // turn on PDO exception handling $con->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); } catch (PDOException $e) { // enter catch block in event of error in preceding try block echo ...
  • I forgot to mention that I am interacting with the DB through an API server, so instead of directly interacting with the DB, I am sending REST requests to the API which in turn interacting with the ...
  • SQL语句是对数据库进行操作的惟一途径,对数据库系统的性能起着决定性的作用。对于同一条件下的SQL语句写法有很多,其中一些写法往往对性能又有很大影响。但是每个人掌握SQL语言的水平不同,如何才能保证写出高性能...
    SQL语句是对数据库进行操作的惟一途径,对数据库系统的性能起着决定性的作用。对于同一条件下的SQL语句写法有很多,其中一些写法往往对性能又有很大影响。但是每个人掌握SQL语言的水平不同,如何才能保证写出高性能的SQL呢?

    针对这种情况,人工智能自动SQL优化工具应运而生。现在我就向大家介绍这样一款工具:SQLTuning for SQL Server。

    1. SQL Tuning 简介

    SQL Turning是Quest公司出品的Quest Central软件中的一个工具。

    QuestCentral(图1)是一款集成化、图形化、跨平台的数据库管理解决方案,可以同时管理Oracle、DB2 和 SQL server 数据库。它包含了如下的多个工具:

    数据库管理(DBA)
     数据库监控(Monitoring Pack)
     数据库诊断 (Spotlight Diagnostics)
     数据库分析 (Database Analysis)
     SQL优化 (SQL Tuning)
     空间管理 (Space Management)
     压力测试 (Load Generator)
     数据生成 (Data Generator)
     PL/SQL 开发 (TOAD)
     专家建议 (Knowledge Expert)

    今天,我们只介绍其中的SQL优化(SQL Tuning for SQL Server) 的使用方法。

    图1 quest central界面

    2. 使用SQL Tuning 优化SQL

    下面我们用SQLServer自带的Northwind数据库为例,帮助大家了解如何使用SQLTuning优化SQL。

    (1)建立连接。
    在QuestCentral主界面上的“Database”树上选择“SQLServer”,然后在下方出现的“Tools”框中选择“SQLTuning”选项,打开“Lanch SQL Tuning for SQL ServerConnections”对话框(图2)。我们在这里建立数据库服务器的连接,以后的分析工作都会在它上面完成。



    图2 “建立连接”对话框

    双击“NewConnection”图标,在弹出窗口中输入数据库的信息,单击“OK”,然后单击“Connect”即可。

    (2)分析原始SQL语句 。
    在打开窗口的“OriangalSQL”文本框内输入需要分析的原始SQL语句,代码如下:

    1
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    /*查询卖出价个不同的同一货物名称*/
    select DISTINCT c.CompanyName,p.ProductName
    from [Order Details] od1,[Order Details] od2 , Orders o1 , Orderso2,Customers c, Products p
    where od1.UnitPrice<>od2.UnitPrice andod1.ProductID=od2.ProductID
    and od1.OrderID=o1.OrderID
    and od2.OrderID=o2.OrderID
    and o1.CustomerID=o2.CustomerID
    and o1.CustomerID=C.CustomerID

    首先在界面左上方选择数据库,然后点击工具栏上的“Execute”按钮,执行原始的SQL语句,SQLTuning会自动分析SQL的执行计划,并把分析结果显示到界面上(图3)。


    图3 分析原始SQL语句

    (3)优化SQL。

    现在我们点击工具栏上的“Optimize Statement”按钮,让SQLTuning开始优化SQL,完成后,可以看到SQLTuning产生了34条与原始SQL等价的优化方案(图4)。


    图4 SQL优化方案

    (4)获得最优SQL。

    接下来,我们来执行上面产生的优化方案,以选出性能最佳的等效SQL语句。在列表中选择需要执行的优化方案(默认已全部选中),然后点击工具栏上的“Execute”按钮旁边的下拉菜单,选择“ExecuteSelected”。等到所有SQL运行完成后,点击界面左方的“TuningResolution”按钮,可以看到最优的SQL已经出来啦,运行时间竟然可以提高52%!(图5)


    图5 “Tuning Resolution”界面

    (5)学习书写专家级的SQL语句。

    通过上面的步骤,我们已经可以实现自动优化SQL语句,但更重要的是,我们还可以学习如何书写这样高性能的SQL语句。点击界面左方的“CompareScenarios”按钮,我们可以比较优化方案和原始SQL中的任意2条SQL语句,SQLTuning会将它们之间的不同之处以不同颜色表示出来,还可以在下方的“执行计划”中,通过比较两条SQL语句的执行计划的不同,来了解其中的差异(图6)。


    图6 “Compare Scenarios”界面

    3.小结

    SQLTuning等人工智能自动SQL优化工具的出现,为我们节省出大量的时间和精力。借助这些工具的帮助,书写专家级的SQL语句将不再是难事。

    展开全文
  • You can turn off interprocedural optimizations with the following parameter: -PenableLTO=false. ./gradlew assembleBase -PenableLTO=false` Note: Building the Base variant would always build realm-core....
  • Turn your Android devices into a web and database server with Palapa Web Server, a suite of web developer. This application has been designed for low memory consumption and CPU usage, specially used ...
  • 1.登入到MySQL数据库中 2.执行 use mysql;进入到mysql库 3.进入后执行 update user set host = '%' where user = 'root';语句,报错也不用理会 4.执行FLUSH PRIVILEGES;刷新MySQL的权限相关表 mysql> use mysql; ...

    报错
    在这里插入图片描述四步解决:
    1.登入到MySQL数据库中
    2.执行 use mysql;进入到mysql库
    3.进入后执行 update user set host = '%' where user = 'root';语句,报错也不用理会
    4.执行FLUSH PRIVILEGES;刷新MySQL的权限相关表

    mysql> use mysql;
    Reading table information for completion of table and column names
    You can turn off this feature to get a quicker startup with -A
    
    Database changed
    mysql> update user set host = '%' where user = 'root';
    Query OK, 1 row affected (0.00 sec)
    Rows matched: 1  Changed: 1  Warnings: 0
    
    mysql> FLUSH PRIVILEGES;
    Query OK, 0 rows affected (0.00 sec)
    

    如果还是连接不上就删除连接,然后重新新建连接。

    提供简单脚本

    [root@mysqld01 ~]# cat navicat.sh
    #!/bin/bash
    read -p "Please enter your MySQL password:" pass
    
    mysql -uroot -p$pass << EOF
    use mysql;
    update user set host = '%' where user = 'root';
    FLUSH PRIVILEGES;
    EOF
    
    echo "ok!"
    
    
    展开全文
  • It is imperative that your server is synchronized with a time-source such as an NTP server. Especially if your server is running within a virtual machine. Why? Read more here. Do not rely on ...
  • 想支持WebRTC服务器coTurn必须开启long-term credentials mechanism,也就是加上-a选项。..../turnserver -a --no-tls --no-dtls --no-stun -u testuser:testpwd -r myrealm -v ./turnutils_peer -v ./tu...
  • Ourmsg2014

    2016-03-14 20:41:28
    服务器端数据库采用SQLite for .net4版本,并发加入单线程队列写数据库,多线程读数据库(用户规模在万人以内完全能够应对),如果想要使用SQL Server、Oracle、My sql等数据库,请自行开发,数据结构参见服务器...
  • 数据格式:{“ id”:1,/ *始终为一个/“ direction”:[1-3],/将接受任何整数,PUT以1表示Left,2表示Forward,3表示Right /“ turn”:[ 0-1],/生产者为0,使用者又为1,则将其PUT要求输入。* /} 注意:请勿...
  • Server version: 5.7.25 MySQL Community Server (GPL) Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved. Oracle is a registered trademark of Oracle Corporation and/or its...
  • 然后我在xp自己装的Mysql数据库,用黑窗口导出来的数据是下面这样的,求大神解答一下啊!为什么xp黑窗口导出来的数据不是表里面的数据呢? mysql Ver 14.14 Distrib 5.5.22, for Win32 (x86) Copyright (c) 2000, ...
  • 在容器中导入数据库的命令行: <code class="language-bash">/opt/lampp/bin/mysql -u root --password="" match_database < /opt/lampp/htdocs/sqlfile.sql </code></pre> 在命令行执行很...
  • 2012-06-06 11:51:34,921 INFO [org.jasig.cas.web.flow.InitialFlowSetupAction] - <Setting path for cookies to: /casServer/> [/quote] [color=red][b]跳转到登录页面后输入账号密码出现cas服务端的信息...
  • This is a kernel-mode driver that demonstrates keyboard input filtering just above the keyboard class driver in order to turn caps-locks into control keys. Filtering at this level allows conversion ...
  • You can turn off this feature to get a quicker startup with -A Database changed mysql> select User from user; +--------+ | User | +--------+ | root | | | | root | | | | root | | wpuser | +--------+ 6...

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