刚刚安装的数据库系统,按照默认安装的话,很可能在 进行 远程 连接 时报错,通常是错误:"在 连接 到 SQL Server 2005 时,在默认的设置下 SQL Server 不 允许 进行 远程 连接 可能会导致此失败。 (provider: 命名管道提供程序, error: 40 - 无法打开到 SQL
刚刚安装的数据库系统,按照默认安装的话,很可能在进行远程连接时报错,通常是错误:"在连接到 SQL Server 2005 时,在默认的设置下 SQL Server 不允许进行远程连接可能会导致此失败。
(provider: 命名管道提供程序, error: 40 - 无法打开到 SQL Server的连接) ",现在针对此问题总结如下:
明白了SQL Server是个网络数据库就可迎刃而解了,简单的分为下面的几种情况。
◆1.数据库引擎没有启动。有两种启动方式:
(1)开始->程序->Microsoft SQL Server 2005->SQL Server 2005外围应用配置器,在打开的界面单击"服务的连接的外围应用配置器",在打开的界面中找到Database Engine,单击"服务",在右侧查看是否已启动,如果没有启动可单击"启动",并确保"启动类型"为自动,不要为手动,否则下次开机时又要手动启动;
(2)可打开:开始->程序->Microsoft SQL Server 2005->配置工具->SQL Server Configuration Manager,选中SQL Server 2005服务中SQL Server(MSSQLSERVER) ,并单击工具栏中的"启动服务"按钮把服务状态改为启动;
使用上面两种方式时,有时候在启动的时候可能会出现错误,不能启动,这时就要查看"SQL Server 2005配置管理器"中的SQL Server 2005网络配置->MSSQLSERVER协议中的VIA是否已启用,如果已启用,则把它禁止.然后再执行上述一种方式操作就可以了.
◆2.是否已经允许远程连接。这个部分可以简单的分为4个方面,分别是在 SQL Server上启用远程连接、启用SQL Server 浏览服务、在Windows 防火墙中为SQL Server 2005 创建例外和在Windows 防火墙中为“SQLBrowser”创建例外。下面是几个具体的操作方式:
在SQLServer 实例上启用远程连接
◆1.指向“开始->程序->Microsoft SQL Server 2005->配置工具->SQL Server 外围应用配置器”
◆2.在“SQL Server 2005 外围应用配置器”页, 单击“服务和连接的外围应用配置器”
◆3.然后单击展开“数据库引擎”, 选中“远程连接”,在右边选中“本地连接和远程连接”,
再选择要使用的协议,( 这个地方应当启用TCP/IP 和命名管道服务!)单击“应用”,您会看到下消息:
“直到重新启动数据库引擎服务后,对连接设置所做的更改才会生效。”,单击“确定”按钮返回
◆4.展开“数据库引擎”, 选中“服务”,在右边单击“停止”,等到 MSSQLSERVER 服务停止,
然后单击“启动”,重新启动MSSQLSERVER 服务。
启用SQLServer 浏览器服务
◆1.指向“开始->程序->Microsoft SQL Server 2005->配置工具->SQL Server 外围应用配置器”
◆2.在“SQL Server 2005 外围应用配置器”页, 单击“服务和连接的外围应用配置器”
◆3.然后单击展开“SQL Server Browser”, 选中“服务”,在右边“启动类型”选择“自动”,
再单击“启动”,单击“确定”按钮返回
在Windows 防火墙中为“SQL Server 2005”创建例外
◆1.在 Windows 防火墙设置界面中,选择“ 例外” 选项卡,然后单击“添加程序”
◆2.在“添加程序窗口”中单击“浏览”
◆3.然后找到“C:\ProgramFiles\Microsoft Files\Microsoft SQL Server\ MSSQL.1 \MSSQL\Binn\sqlservr.exe”,
单击“确定”返回
注意 : 路径可能会根据 SQL Server 2005 安装不同而不同。 MSSQL.1 是占位符,对应数据库实例ID。
◆4.对每个需要打开远程访问的SQL Server 2005 实例,重复步骤 1 至 3。
在Windows 防火墙中为“SQLBrowser”创建例外
◆1.在 Windows 防火墙设置界面中,选择“ 例外” 选项卡,然后单击“添加程序”
◆2.在“添加程序窗口”中单击“浏览”
◆3.然后找到“C:\ProgramFiles\Microsoft Files\Microsoft SQL Server\90\Shared\sqlbrowser.exe”,
单击“确定”返回
注意 :路径可能会根据 SQL Server 2005 安装不同而不同。在使用.NET开发进行时,会遇到使用连接字符串连接SQL Server 2005数据库使用机器名称和localhost都能连接,但是使用IP地址却不能连接的问题,解决的办法是在SQL Server实例上启用本地和远程连接,并且在选择协议的时候使用TCP/IP和命名管道服务即可解决

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In MySQL, sorting uses the ORDERBY clause, and ranking uses the RANK(), DENSE_RANK(), and ROW_NUMBER() functions. 1. Sort: Use ORDERBY clause, such as SELECT*FROMemployeesORDERBYsalaryDESC; 2. Ranking: Use window functions, such as SELECTemployee_name, salary, RANK()OVER(ORDERBYsalaryDESC)ASrankFROMemployees; these operations are based on SQL query optimizer and execution engine, and are often used to sort quickly or merge sort, and ranking depends on window function calculation.

To create and call stored procedures in MySQL, follow the following steps: 1. Create stored procedures: Use the CREATEPROCEDURE statement to define stored procedures, including names, parameters, and SQL statements. 2. Compile stored procedures: MySQL compiles stored procedures into executable code and stores them. 3. Call stored procedure: use CALL statement and pass parameters. 4. Execute stored procedures: MySQL executes the SQL statements in it, processes parameters and returns the result.

The MySQL service can be set to automatically start on Windows, Linux, and macOS. 1) On Windows, use the command "scconfigmysqlstart=auto" to configure. 2) On Linux, enable it using "sudosystemctlenablemysql". 3) On macOS, create and load the launchd configuration file to achieve automatic startup.

The methods to view the MySQL table structure include: 1. Use the DESCRIBE command to view column information; 2. Use the SHOWCREATETABLE command to view table creation statements; 3. Use information_schema to query more detailed information. These methods help to quickly understand table structure and improve work efficiency.

Installing MySQL on macOS can be achieved through the following steps: 1. Install Homebrew, using the command /bin/bash-c"$(curl-fsSLhttps://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)". 2. Update Homebrew and use brewupdate. 3. Install MySQL and use brewinstallmysql. 4. Start MySQL service and use brewservicesstartmysql. After installation, you can use mysql-u


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