2、IsAutoCloseConnection=true 需要设置true 3、异步方法wait存在漏写, 一个不能少 。解决方案:找到漏掉的await不想找就用db.CopyNew()。 4、使用await 返回值必须有Task,不能是Void 这种(表达式中异步只能是Func<Task>不能是Action<X> ,比如List.Forech就是Action要改普通forech) ,不想修改 db改成db.Copy...
Npgsql.NpgsqlOperationInProgressException 异常表示在尝试执行一个新的数据库命令时,前一个命令仍在执行中。这是 Npgsql(PostgreSQL 的 .NET 数据提供程序)的一个限制,因为它不支持在单个连接上同时执行多个命令(也称为 Multiple Active Result Sets,MARS)。 可能原因 多个命令并发执行:在同一个数据库连接上,尝试同...
The error "command already in progress" indicates that the same connection is being used concurrently. In EF Core this would generally mean that you're trying to use the same DbContext instance twice at the same time. It seems from your code sample that you're keeping a reference to the ...
But this should not be the case for the connection even if I am performing multiple commands using separate Npgsql.Command A single connection should allow multiple commands as it was allowing till 4.0.7 Exception message: Npgsql.NpgsqlOperationInProgressException: A command is already in progress ...
PostgreSQL 一、缓冲区类型 数据访问层 这一层主要是数据库引擎中对于数据的逻辑使用的层次,如用户查询数据,数据通过索引被访问到,索引不是直接从存储介质上请求 IO,而是从数据缓存层中读取,如果缓存中没有,则由缓存层负责向底层(数据存储层)获取相应的数据。
How to Create a Trigger in PostgreSQL? Following are the steps that we need to follow to create a trigger in Postgresql: First, We create a “trigger function” using the CREATE FUNCTION command. Second, we use the CREATE TRIGGER statement to connect/bind the trigger function to the table....
The destination PolarDB for PostgreSQL cluster is created. The available storage space of the destination PolarDB for PostgreSQL cluster is larger than the total size of the data in the source ApsaraDB RDS for PostgreSQL instance. For more information, see Create...
HELP!!! An asynchronous read operation is already in progress on the StandardOutput stream HELP!!! How do I send an ACK packet in TCP IP Listener c# Hex in StreamReader and StreamWriter Hex leading zero; Is there a better way hexadecimal value 0x20, cannot be included !!! Hi have to...
You might already have MySQL or PostgreSQL configuration settings tuned for performance and scalability in your current environment. The Aurora storage subsystem is adapted and tuned for a distributed cloud-based environment with a high-speed storage subsystem. As a result, many former database engine...
See https://fl.vu/mysql-conn-reuseMySqlConnector.Core.ServerSession.StartQuerying(ICancellableCommand command) in ServerSession.cs, line 285error is in this line 复制 var product = await applicationDBContext.ProductsDB.FindAsync(productInCart.ProductID); how i connected to mysql server...