Pomelo.EntityFrameworkCore.MySql -连接字符串
Pomelo.EntityFrameworkCore.MySql -连接字符串
提问于 2021-08-02 00:49:09
我是dotnet和EF的新手。
目前，我正在启动一个控制台应用程序，并已收到错误。
DBContext
protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
{
optionsBuilder.UseMySql(ServerVersion.AutoDetect(
"server=localhost; port=3306; database=DB; user=root; password=test; Persist Security Info=False; Connect Timeout=300"));
}错误
System.InvalidOperationException: A relational store has been configured without specifying either the DbConnection or connection string to use.
at Pomelo.EntityFrameworkCore.MySql.Internal.MySqlOptions.GetConnectionSettings(MySqlOptionsExtension relationalOptions)
at Pomelo.EntityFrameworkCore.MySql.Internal.MySqlOptions.Initialize(IDbContextOptions options)
at Microsoft.EntityFrameworkCore.Internal.SingletonOptionsInitializer.EnsureInitialized(IServiceProvider serviceProvider, IDbContextOptions options)
at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.<>c__DisplayClass4_0.<GetOrAdd>g__BuildServiceProvider|3()
at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.<>c__DisplayClass4_0.<GetOrAdd>b__2(Int64 k)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at Microsoft.EntityFrameworkCore.Internal.ServiceProviderCache.GetOrAdd(IDbContextOptions options, Boolean providerRequired)
at Microsoft.EntityFrameworkCore.DbContext.get_InternalServiceProvider()
at Microsoft.EntityFrameworkCore.DbContext.Microsoft.EntityFrameworkCore.Infrastructure.IInfrastructure<System.IServiceProvider>.get_Instance()
at Microsoft.EntityFrameworkCore.Infrastructure.Internal.InfrastructureExtensions.GetService[TService](IInfrastructure`1 accessor)
at Microsoft.EntityFrameworkCore.Infrastructure.AccessorExtensions.GetService[TService](IInfrastructure`1 accessor)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(Func`1 factory)
at Microsoft.EntityFrameworkCore.Design.Internal.DbContextOperations.CreateContext(String contextType)
at Microsoft.EntityFrameworkCore.Design.Internal.MigrationsOperations.AddMigration(String name, String outputDir, String contextType, String namespace)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigrationImpl(String name, String outputDir, String contextType, String namespace)
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.AddMigration.<>c__DisplayClass0_0.<.ctor>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.<>c__DisplayClass3_0`1.<Execute>b__0()
at Microsoft.EntityFrameworkCore.Design.OperationExecutor.OperationBase.Execute(Action action)
A relational store has been configured without specifying either the DbConnection or connection string to use.Stack Overflow用户
发布于 2022-05-31 08:26:59
我也有同样的错误信息。
var serverVersion = new MySqlServerVersion(new Version(8, 0, 27));
services.AddDbContext<AppDbContext>(options => options.UseMySql("server=localhost;user=user;password=password;database=db", serverVersion));
有了这段代码，它就能工作了。有关更多信息，请参见来自Pomelo的官方文档：
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/68615394
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