1. 用SqlConnection 连接SQLServer数据库 try { string sqlConn = "server=DELL-PC/SQLEXPRESS1;database=OPGWDB;uid=sa;pwd=sa"; SqlConnection conn = new SqlConnection(sqlConn); conn.Open(); DataTable dt = new DataTable(); string sql = "Select * from dbo.Yhjsb"; SqlDataAdapter ad = new...
usingSystem.Data.SqlClient;classProgram{staticvoidMain(){stringconnectionString="Server=.\\SQLEXPRESS;Database=YourDatabase;User Id=YourUser;Password=YourPassword;";using(SqlConnectionconnection=newSqlConnection(connectionString)){try{connection.Open();Console.WriteLine("Successfully connected to SQL Server...
stringconnectionString="Server=YOUR_SERVER_NAME\\INSTANCE_NAME;Database=YOUR_DATABASE_NAME;User Id=YOUR_USERNAME;Password=YOUR_PASSWORD;"; 1. 流程图 下图展示了解决“Error 40”的基本流程: 是否是否检查 SQL Server 服务服务是否运行?检查连接字符串启动 SQL Server 服务连接字符串正确?检查防火墙设置修正连...
connectionstring,发现Data Source上存在括号,虽然不知道括号的真正作用,但是我知道有时候是需要的,而有时候又是不需要的,我去除了括号变成 <connectionStrings> <add name="Sql2005Conn"connectionString="Data Source=192.168.2.102;Initial Catalog=master;User ID=sa;Password=123456"providerName="System.Data.SqlClien...
1、确定服务器可连通，确定SQL端口开放。2、注意防火墙。3、查看你的连接字符串。4、开始->>SQLServer2005->>配置工具->>SQLServer外围应用配置器->>服务和外围连接的应用配置器->>点击"远程连接"->>本地连接和远程连接->>同时使用TCP/IP和named Pipes->>点"确定"->>重启SQLserver服务 ...
string SqlStr = "Server=(localhost);User Id=sa;Pwd=;DataBase=pubs";SqlConnection con = new SqlConnection(SqlStr);再试试
error: 40 - Could not open a connection to SQL Server 04-01-2022 10:51 AM Hi all. have an issue with connection to SQL server. and this just start happens recently. before it works perfect. I can connect to server succesfully via MSSMS but not via Power BI, ...
The connection string is looking for a database server on the web server.Copy "ConnectionStrings": { "myDb1": "data source=.;initial catalog = Northwind; integrated security = true; " I assume the web serer does not have a database server running. Only you know the answer to this ...
Engine 节点,先择"远程连接",接下建议选择"同时使用TCP/IP和named pipes",确定后,重启数据库服务就可以了.如果还出现错误的话 那么请你检查一下所写的代码connectionString中的Data Source这个属性填写的值是否正确 本机默认填写.\SQLEXPRESS 或者换成 计算机名\SQLEXPRESS ......
string connectionString = "Server=\\.\\SQLEXPRESS;Database=YourDatabase;Integrated Security=True;"; // 注意:这里的\\.\\SQLEXPRESS表示使用本地机器上的SQLEXPRESS实例,\\表示本地机器 // 如果您正在连接到远程服务器或不同的实例,请相应地修改Server属性 using (SqlConnection connection = new SqlConnect...