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问题表象:我的mysql中的 my.ini文件配置:
[csharp]#Path to installation directory. All paths are usually resolved relative to this. basedir="D:/software_builder/mysql/" #Path to the database root datadir="C:/ProgramData/MySQL/MySQL Server 5.5/Data/" 我在 datadir的路径下找到.err文件,查看错误原因 [html]121022 15:21:06 [Note] Plugin 'FEDERATED' is disabled. D:/software_builder/mysql/bin/mysqld: Table 'mysql.plugin' doesn't exist 121022 15:21:06 [ERROR] Can't open the mysql.plugin table. Please run mysql_upgrade to create it. 121022 15:21:06 InnoDB: The InnoDB memory heap is disabled 121022 15:21:06 InnoDB: Mutexes and rw_locks use Windows interlocked functions 121022 15:21:06 InnoDB: Compressed tables use zlib 1.2.3 121022 15:21:06 InnoDB: Initializing buffer pool, size = 500.0M 121022 15:21:06 InnoDB: Completed initialization of buffer pool 121022 15:21:06 InnoDB: Log file ./ib_logfile0 did not exist: new to be created InnoDB: Setting log file ./ib_logfile0 size to 100 MB InnoDB: Database physically writes the file full: wait... InnoDB: Progress in MB: 100 121022 15:21:07 InnoDB: Log file ./ib_logfile1 did not exist: new to be created InnoDB: Setting log file ./ib_logfile1 size to 100 MB InnoDB: Database physically writes the file full: wait... InnoDB: Progress in MB: 100 121022 15:21:10 InnoDB: highest supported file format is Barracuda. InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 121022 15:21:10 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 121022 15:21:10 InnoDB: Waiting for the background threads to start 121022 15:21:11 InnoDB: 1.1.8 started; log sequence number 3700748 121022 15:21:11 [ERROR] Fatal error: Can't open and lock privilege tables: Table 'mysql.host' doesn't exist 尝试过无数种网络搜索的解决方法,有过重装mysql的念头,也有过砸电脑的冲动,但最后还是天不负有心人,终于找到了解决方法; 第一步:在mysql的安装目录下 basedir="D:/software_builder/mysql/的data文件夹里“D:/software_builder/mysql/data”" 下面还有一个mysql的文件夹(如图),
把“mysql文件夹”拷贝到数据库的数据存放位置的data文件夹下(我的是:C:/ProgramData/MySQL/MySQL Server 5.5/data)
然后在服务里面启动mysql服务,结果:“I get it !”
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本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于架构原理的相关内容,MySQL Server架构自顶向下大致可以分网络连接层、服务层、存储引擎层和系统文件层,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用char()和REPLACE()函数来替换换行符;REPLACE()函数可以用新字符串替换列中的换行符,而换行符可使用“char(13)”来表示,语法为“replace(字段名,char(13),'新字符串') ”。

方法:1、利用right函数,语法为“update 表名 set 指定字段 = right(指定字段, length(指定字段)-1)...”;2、利用substring函数,语法为“select substring(指定字段,2)..”。

mysql的msi与zip版本的区别:1、zip包含的安装程序是一种主动安装,而msi包含的是被installer所用的安装文件以提交请求的方式安装;2、zip是一种数据压缩和文档存储的文件格式,msi是微软格式的安装包。

转换方法:1、利用cast函数,语法“select * from 表名 order by cast(字段名 as SIGNED)”;2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于MySQL复制技术的相关问题,包括了异步复制、半同步复制等等内容,下面一起来看一下,希望对大家有帮助。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了mysql高级篇的一些问题,包括了索引是什么、索引底层实现等等问题,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用REGEXP运算符判断数据是否是数字类型,语法为“String REGEXP '[^0-9.]'”;该运算符是正则表达式的缩写,若数据字符中含有数字时,返回的结果是true,反之返回的结果是false。


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