.net core 5 with EF LINQ (NPGSQL) Timestamp 参数在函数中导致 Npgsql.PostgresException (0x80004005)

Question

尝试使用时间戳参数调用函数（尝试使用和不使用时区），我收到此错误。

Npgsql.PostgresException (0x80004005): 22007: invalid input syntax for type timestamp: "@p1"
   at Npgsql.NpgsqlConnector.<ReadMessage>g__ReadMessageLong|194_0(NpgsqlConnector connector, Boolean async, DataRowLoadingMode dataRowLoadingMode, Boolean readingNotifications, Boolean isReadingPrependedMessage)
   at Npgsql.NpgsqlDataReader.NextResult(Boolean async, Boolean isConsuming, CancellationToken cancellationToken)
   at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
   at Npgsql.NpgsqlCommand.ExecuteReader(CommandBehavior behavior, Boolean async, CancellationToken cancellationToken)
   at Npgsql.NpgsqlCommand.ExecuteDbDataReaderAsync(CommandBehavior behavior, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReaderAsync(RelationalCommandParameterObject parameterObject, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.Internal.FromSqlQueryingEnumerable`1.AsyncEnumerator.InitializeReaderAsync(DbContext _, Boolean result, CancellationToken cancellationToken)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlExecutionStrategy.ExecuteAsync[TState,TResult](TState state, Func`4 operation, Func`4 verifySucceeded, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.Query.Internal.FromSqlQueryingEnumerable`1.AsyncEnumerator.MoveNextAsync()
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Microsoft.EntityFrameworkCore.EntityFrameworkQueryableExtensions.ToListAsync[TSource](IQueryable`1 source, CancellationToken cancellationToken)
   at Rainman.Data.Repositories.RoutePlanRepository.GetCustomerRoutingCacheAsync(Int64 id) in C:\Users\sam_w\source\repos\rainman_api\lib\rainmanLibrary\Rainman.Data\Repositories\RoutePlanRepository.cs:line 893
   at Rainman.Services.RoutePlanService.GetCustomerRoutingCaches(Int64 id) in C:\Users\sam_w\source\repos\rainman_api\lib\rainmanLibrary\Rainman.Services\RoutePlanService.cs:line 184
   at Rainman.Api.Controllers.RoutePlanController.GetCustomerRoutingCache(Int64 id) in C:\Users\sam_w\source\repos\rainman_api\Rainman.Api\Controllers\RoutePlanController.cs:line 137
   at lambda_method5(Closure , Object )
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.AwaitableObjectResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeActionMethodAsync>g__Awaited|12_0(ControllerActionInvoker invoker, ValueTask`1 actionResultValueTask)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeNextActionFilterAsync>g__Awaited|10_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
   at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
  Exception data:
    Severity: ERROR
    SqlState: 22007
    MessageText: invalid input syntax for type timestamp: "@p1"
    Position: 51
    File: datetime.c
    Line: 3761
    Routine: DateTimeParseError

这是出错的代码：

        FormattableString query = $"SELECT public.fn_test_lcr_custom('{routePlan.DeckApplyCustomer.tg_id}', timestamp '{routePlan.effective_date.ToString("u")}');";
        Console.WriteLine($"\n\nQUERY:\n{query}\n\n");
        List<CustomerRoutingCache> tmpList = await RainmanDbContext.CustomerRoutingCaches.FromSqlInterpolated(query).ToListAsync();

我尝试了几种不同的字符串格式，但没有任何效果。 我什至有一个使用相同格式获取时间戳的示例。

            string query = $"SELECT fnlcr_custom('{tg.tg_id}', timestamp '{asOfTS.ToString("u")}');";
            return await RainmanDbContext.Database.ExecuteSqlRawAsync(query);

任何帮助，将不胜感激！！！

顺便说一句使用

.net 核心 5

Microsoft.EntityFrameworkCore v5.0.8

NPgSQL v5.0.7

Answer 1

通常，您应该从查询文本中删除单引号和timestamp ，并使用FromSqlInterpolated 。 它将为内插字符串中的每个标记绑定一个具有适当类型的参数（映射可以在 Npgsql 文档的.NET 类型和 PostgreSQL 类型部分中看到），例如

var query = db.Set<CustomerRoutingCache>().FromSqlInterpolated(
    $"select * from public.fn_test_lcr_custom({routePlan.DeckApplyCustomer.tg_id}, {routePlan.effective_date})"
);

Console.WriteLine(query.ToQueryString());

var result = await query.ToListAsync();