我的數據庫不會更新，我的連接字符串有問題

Question

我多年來一直試圖弄清楚這一點，我嘗試了不同的方法，但似乎沒有任何效果。 我已經成功完成了遷移，現在我的項目有了一個遷移文件。 我正在嘗試更新我的數據庫，但每次嘗試都失敗。

作為記錄，我正在使用 Macbook 並在項目中使用 Visual Code。 我在命令行中輸入了這個

dotnet ef database update InitialCreate

我也試過這個：

dotnet ef database update -c LoanContext Development

這是我輸入上述內容時在命令行中顯示的內容

Build started...
Build succeeded.
info: Microsoft.EntityFrameworkCore.Infrastructure[10403]  

Entity Framework Core 2.2.6-servicing-10079 initialized 'LoanContext' using provider 'Microsoft.EntityFrameworkCore.SqlServer' with options: None

System.Data.SqlClient.SqlException (0x80131904)：建立與 SQL Server 的連接時發生與網絡相關或特定於實例的錯誤。 服務器未找到或無法訪問。 驗證實例名稱是否正確以及 SQL Server 是否配置為允許遠程連接。 （提供者：TCP 提供者，錯誤：25 - 連接字符串無效）

System.Net.Sockets.SocketException (0x80004005): 未定義錯誤: 0

在 System.Data.SqlClient.SNI.SSRP.GetPortByInstanceName(String browserHostName, String instanceName)
在 System.Data.SqlClient.SNI.SNIProxy.CreateTcpHandle(DataSource details, Int64 timerExpire, Object callbackObject, Boolean parallel) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, SqlCredential credential, Object providerInfo, String newPassword, SecureString newSecurePassword, Boolean redirectedUserInstance, SqlConnectionString userConnectionOptions, SessionData reconnectSessionData, Boolean applyTransientFaultHandling, String accessToken) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool ownConnectionOption pool) System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnectionPool pool, DbConnection owningObject, DbConnectionOptions options, DbConnectionPoolKey poolKey, DbConnectionOptions userOptions) 在 System.Data.Provid erBase.DbConnectionPool.CreateObject(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) 在 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject, DbConnectionOptions userOptions, DbConnectionInternal oldConnection) 在 System.Data.ProviderBase.DbConnectionPool.Try owningConnection(UI32GetConnection) waitForMultipleObjectsTimeout, Boolean allowCreate, Boolean onlyOneCheckConnection, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionPool.TryGetConnection(DbConnection owningObject, TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource owningObject, TaskCompletionSource 1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource在 System.Data.ProviderBase.DbConnectionIntern 上擁有連接1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) at System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource 1 重試、DbConnectionOptions userOptions、DbConnectionInternal oldConnection、DbConnectionInternal& connection) al.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry, DbConnectionOptions userOptions) at System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource 1 retry, DbConnectionOptions userDataConnections) at System.Client TryOpen(TaskCompletionSource 1 retry) at System.Data.SqlClient.SqlConnection.Open() at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.OpenDbConnection(Boolean errorsExpected) at Microsoft.EntityFrameworkCore.Storage.RelationalConnection.Open(Boolean errorsExpected) at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerDatabaseCreator.<>c__DisplayClass18_0.<Exists>b__0(DateTime giveUp) at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.<>c__DisplayClass12_0 2.b__0(DbContext c, TState s) 在 Microsoft.EntityFrameworkCore.SqlServer.Storage內部.SqlServerExecut ionStrategy.Execute[TState,TResult](TState state, Func 3 operation, Func 3 verifySucceeded) at Microsoft.EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, Func 2 operation, Func 2 verifySucceeded, TState state) at Microsoft .EntityFrameworkCore.ExecutionStrategyExtensions.Execute[TState,TResult](IExecutionStrategy strategy, TState state, Func`2 operation) at Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerDatabaseCreator.Exists(Boolean retryOnNotExists) at Microsoft.EntityFrameworkCore.SqlServer.Storage。 Internal.SqlServerDatabaseCreator.Exists() 在 Microsoft.EntityFrameworkCore.Migrations.HistoryRepository.Exists() 在 Microsoft.EntityFrameworkCore.Migrations.Internal.Migrator.Migrate(String targetMigration) 在 Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.UpdateDatabase(String targetMigration) , String contextType) 在 Microsoft.EntityFrameworkCore.Design.OperationExecutor.UpdateDatabase.<>c__DisplayC lass0_1.<.ctor>b__0() 在 Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)

ClientConnectionId:00000000-0000-0000-0000-000000000000

與 SQL Server 建立連接時發生與網絡相關或特定於實例的錯誤。 服務器未找到或無法訪問。 驗證實例名稱是否正確以及 SQL Server 是否配置為允許遠程連接。 （提供者：TCP 提供者，錯誤：25 - 連接字符串無效）

這是我的appsettings.json文件

"Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
},
"AllowedHosts": "*",
"connectionStrings": {
    "DevConnection": "server=(local)\\sqlexpress;Database=LoanDB;Trusted_Connection=True;MultipleActiveResultSets=True"
}

我的 startup.cs 文件中的代碼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using WebAPI.Models;

namespace WebAPI
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            services.AddDbContext<LoanContext>(options =>
            options.UseSqlServer(Configuration.GetConnectionString("DevConnection")));
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseMvc();
        }
    }
}

我還嘗試通過此站點https://www.connectionstrings.com/sql-server-2012/更改連接字符串。 沒有任何效果，對此的任何幫助將不勝感激。

Answer 1

您是否為 SQL Server 實例啟用了 TCP？

啟動 SQL Server 配置管理器並展開 SQL Server 網絡配置和協議並檢查值。 以下示例顯示 TCP/IP 已禁用 - 如果是，則右鍵單擊它並將其設置為啟用並重新啟動您的實例。