标签:mysql asp-net-mvc entity-framework asp-net entity-framework-6
我有使用链接到MySQL数据库的Code First Entity Framework 6的Asp.Net MVC 5应用程序.
当我第一次创建数据库时,它工作正常.但是,当我对模型进行更改时,请添加迁移. (Update-Database)之后显示错误.
这是错误:
PM> Update-Database
System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at MySql.Data.MySqlClient.MySqlConnectionStringBuilder.<>c.<.cctor>b__2_7(MySqlConnectionStringBuilder msb, MySqlConnectionStringOption sender)
at MySql.Data.MySqlClient.MySqlConnectionStringBuilder.get_Item(String keyword)
at MySql.Data.MySqlClient.MySqlConnectionStringBuilder.GetConnectionString(Boolean includePass)
at MySql.Data.MySqlClient.MySqlConnection.get_ConnectionString()
at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<GetConnectionString>b__12(DbConnection t, DbConnectionInterceptionContext`1 c)
at System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch[TTarget, TInterceptionContext, TResult](TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed)
at System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.GetConnectionString(DbConnection connection, DbInterceptionContext interceptionContext)
at System.Data.Entity.Internal.InternalConnection.GetStoreConnectionString(DbConnection connection)
at System.Data.Entity.Internal.InternalConnection.OnConnectionInitialized()
at System.Data.Entity.Internal.EagerInternalConnection..ctor(DbContext context, DbConnection existingConnection, Boolean connectionOwned)
at System.Data.Entity.DbContext..ctor(DbConnection existingConnection, Boolean contextOwnsConnection)
at System.Data.Entity.Migrations.History.HistoryContext..ctor(DbConnection existingConnection, String defaultSchema)
at MySql.Data.Entity.MySqlHistoryContext..ctor(DbConnection existingConnection, String defaultSchema)
at code_first_mysql.Migrations.Configuration.<>c.<.ctor>b__0_0(DbConnection conn, String schema) in C:\Users\User\Documents\Tree\New Backend\code first mysql\Migrations\Configuration.cs:line 16
at System.Data.Entity.Migrations.History.HistoryRepository.CreateContext(DbConnection connection, String schema)
at System.Data.Entity.Migrations.History.HistoryRepository.<GetUpgradeOperations>d__16.MoveNext()
at System.Linq.Enumerable.Any[TSource](IEnumerable`1 source)
at System.Data.Entity.Migrations.DbMigrator.UpdateInternal(String targetMigration)
at System.Data.Entity.Migrations.DbMigrator.<>c__DisplayClassc.<Update>b__b()
at System.Data.Entity.Migrations.Infrastructure.MigratorScriptingDecorator.EnsureDatabaseExists(Action mustSucceedToKeepDatabase)
at System.Data.Entity.Migrations.DbMigrator.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorBase.Update(String targetMigration)
at System.Data.Entity.Migrations.Infrastructure.MigratorScriptingDecorator.ScriptUpdate(String sourceMigration, String targetMigration)
at System.Data.Entity.Migrations.Design.ToolingFacade.ScriptUpdateRunner.Run()
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.AppDomain.DoCallBack(CrossAppDomainDelegate callBackDelegate)
at System.Data.Entity.Migrations.Design.ToolingFacade.Run(BaseRunner runner)
at System.Data.Entity.Migrations.Design.ToolingFacade.ScriptUpdate(String sourceMigration, String targetMigration, Boolean force)
at System.Data.Entity.Migrations.UpdateDatabaseCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
The given key was not present in the dictionary.
这些是我的MySQL配置类:
internal sealed class Configuration : DbMigrationsConfiguration<ApplicationDbContext>
{
public Configuration()
{
AutomaticMigrationsEnabled = false;
SetSqlGenerator("MySql.Data.MySqlClient", new MySqlMigrationSqlGenerator());
SetHistoryContextFactory("MySql.Data.MySqlClient", (conn, schema) => new MySqlHistoryContext(conn, schema));
CodeGenerator = new MySqlMigrationCodeGenerator();
}
protected override void Seed(ApplicationDbContext context)
{}
}
public class MySqlConfiguration: DbConfiguration
{
public MySqlConfiguration()
{
SetHistoryContext("MySql.Data.MySqlClient", (conn, schema) => new MySqlHistoryContext(conn, schema));
}
}
public class MySqlHistoryContext : HistoryContext
{
public MySqlHistoryContext(DbConnection existingConnection, string defaultSchema) : base(existingConnection, defaultSchema)
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<HistoryRow>().Property(h => h.MigrationId).HasMaxLength(100).IsRequired();
modelBuilder.Entity<HistoryRow>().Property(h => h.ContextKey).HasMaxLength(200).IsRequired();
}
}
public class MySqlInitializer : IDatabaseInitializer<ApplicationDbContext>
{
public void InitializeDatabase(ApplicationDbContext context)
{
if (!context.Database.Exists())
{
// if database did not exist before - create it
context.Database.Create();
}
else
{
// query to check if MigrationHistory table is present in the database
var migrationHistoryTableExists = ((IObjectContextAdapter)context).ObjectContext.ExecuteStoreQuery<int>(
string.Format(
"SELECT COUNT(*) FROM information_schema.tables WHERE table_schema = '{0}' AND table_name = '__MigrationHistory'", "mydb"));
// if MigrationHistory table is not there (which is the case first time we run) - create it
if (migrationHistoryTableExists.FirstOrDefault() == 0)
{
context.Database.Delete();
context.Database.Create();
}
}
}
}
解决方法:
从错误的第一行可以看出,
MySql.Data.MySqlClient.MySqlConnectionStringBuilder.<>c.<.cctor>b__2_7(MySqlConnectionStringBuilder
msb, MySqlConnectionStringOption sender)
at MySql.Data.MySqlClient.MySqlConnectionStringBuilder.get_Item(String
keyword)
该错误与ConnectionString有关.问题是ConnectionString包含无法读取的键.
尝试清理ConnectionString,使其仅具有
>服务器
>用户ID
>密码
>数据库
就我而言,ConnectionString具有额外的密钥集成安全性.删除此选项后,Update-Database开始正常运行.但是,根据您的情况,这可能是(也可能不是)导致错误的关键.
因此,再次提出我提出并有保证的解决方案,通过ConnectionString对其进行简化,使其仅包含上述4个键.
标签:mysql,asp-net-mvc,entity-framework,asp-net,entity-framework-6 来源: https://codeday.me/bug/20191012/1904036.html
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