ChangeDatabase(string databaseName):更改当前数据库连接所使用的数据库。 属性: ConnectionString:获取或设置用于打开数据库连接的连接字符串。 State:获取当前连接的状态(如打开、关闭等)。 ServerVersion:获取连接到的 PostgreSQL 服务器的版本。 5. 提供 NpgsqlConnection 的常见错误处理方法和最佳实践 常见错误处理...
NpgsqlConnection conn = new NpgsqlConnection(connString); conn.Open(); 构造一个SQL插入语句,指定要插入的数据和目标表的名称。示例代码如下: 代码语言:txt 复制 string insertQuery = "INSERT INTO table_name (column1, column2, column3) VALUES (@value1, @value2, @value3)"; ...
EN1.装好Postgres 2.开启远程访问 配置postgresql.conf文件 listen_addresses = '*' 配置pg_hba.co...
在Npgsql.NpgsqlConnection.<>c__DisplayClass32_0.<<Open>g__OpenLong|0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- 在System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() 在System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebugger...
could not send data to client: Connection timed out (pqcomm.c:1347) connection to client lost The previous session was reset because its gang was disconnected (session id = 283075). The new session id = 284678 We have tried using Connection strings with and without keep alive as follows, ...
varcon =newNpgsqlConnection( connectionString:"Server=localhost;Port=5432;User Id=postgres;Password=passw0rd;Database=testdb;"); con.Open();usingvar cmd =newNpgsqlCommand(); cmd.Connection = con; cmd.CommandText =$"DROP TABLE IF EXISTS teachers");awaitcmd.ExecuteNonQueryAsync(); ...
at Npgsql.NpgsqlConnection.g__OpenAsync|45_0(Boolean async, CancellationToken cancellationToken) Exception data: Severity: FATAL SqlState: 3D000 MessageText: database "sampledb" does not exist File: postinit.c Line: 875 Routine: InitPostgres|{4262820c-ec1a-4f47-a48e-feedcccf366b}:133235094305210...
NpgsqlConnection conn = new NpgsqlConnection("Server=127.0.0.1;Port=5432;User Id=joe;Password=secret;Database=joedata;"); conn.Open(); conn.Close(); } } Connection String parameters 连接字符串参数 当建立连接,NpgsqlConnection接受许多参数改变其行为。这里是目前已有的参数可以修改:(到 Npg...
```csharp using System; using Npgsql; class Program { static void Main(string[] args) { string connectionString = "Host=localhost;Port=5432;Database=mydatabase;User Id=myuser;Password=mypassword;"; NpgsqlConnection connection = new NpgsqlConnection(connectionString); connection.Open(); NpgsqlCo...
4.code string strConn = ConfigurationManager.ConnectionStrings["npgsql"].ConnectionString;