c# – Npgsql / EF 6 – json列

2023年6月30日 266次阅读

我正在尝试使用
JSON列创建迁移.这是我试过的：

    [Column(TypeName = "Jsonb")]
    public string Data { get; set; }

    [Column(TypeName = "Json")]
    public string Data { get; set; }

    modelBuilder.Entity<Member>().Property(p => p.Data).HasColumnType("Json");

    modelBuilder.Entity<Member>().Property(p => p.Data).HasColumnType("Jsonb");

什么都没有,这是例外：

System.InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable1 source, Func2 predicate)
at System.Data.Entity.Utilities.DbProviderManifestExtensions.GetStoreTypeFromName(DbProviderManifest providerManifest, String name)
at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.ConfigureColumn(EdmProperty column, EntityType table, DbProviderManifest providerManifest)
at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(EdmProperty column, EntityType table, DbProviderManifest providerManifest, Boolean allowOverride, Boolean fillFromExistingConfiguration)
at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.<>c__DisplayClass4.b__3(Tuple2 pm)
at System.Data.Entity.Utilities.IEnumerableExtensions.Each[T](IEnumerable1 ts, Action1 action)
at System.Data.Entity.ModelConfiguration.Configuration.Properties.Primitive.PrimitivePropertyConfiguration.Configure(IEnumerable1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride, Boolean fillFromExistingConfiguration)
at System.Data.Entity.ModelConfiguration.Configuration.Types.StructuralTypeConfiguration.ConfigurePropertyMappings(IList1 propertyMappings, DbProviderManifest providerManifest, Boolean allowOverride)
at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.ConfigurePropertyMappings(DbDatabaseMapping databaseMapping, EntityType entityType, DbProviderManifest providerManifest, Boolean allowOverride)
at System.Data.Entity.ModelConfiguration.Configuration.Types.EntityTypeConfiguration.Configure(EntityType entityType, DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.ConfigureEntityTypes(DbDatabaseMapping databaseMapping, ICollection1 entitySets, DbProviderManifest providerManifest)
at System.Data.Entity.ModelConfiguration.Configuration.ModelConfiguration.Configure(DbDatabaseMapping databaseMapping, DbProviderManifest providerManifest)
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
at System.Data.Entity.Internal.RetryLazy2.GetValue(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet1.get_InternalContext()
at System.Data.Entity.Internal.Linq.InternalSet1.get_Local()
at System.Data.Entity.DbSet`1.get_Local()
at System.Data.Entity.DbModelBuilderExtensions.RegisterUserAccountChildTablesForDelete[TKey,TAccount,TUserClaim,TLinkedAccount,TLinkedAccountClaim,TPasswordResetSecret,TTwoFactorAuthToken,TUserCertificate](DbContext ctx) in c:\ballen\github\brockallen\BrockAllen.MembershipReboot\src\BrockAllen.MembershipReboot.Ef\DbModelBuilderExtensions.cs:line 26

这是我的配置：

<package id="EntityFramework" version="6.1.1" targetFramework="net452" />
<package id="EntityFramework6.Npgsql" version="3.1.1" targetFramework="net452" />
<package id="Npgsql" version="3.1.6" targetFramework="net452" />

最佳答案 因此,这是完全可行的,但需要修改生成的迁移,而不是注释模型或使用流畅的配置.在生成的迁移中,更改数据列的声明以使用storeType和defaultValueSql参数：

data = c.String(nullable: false, storeType: "jsonb", defaultValueSql: "'{}'::jsonb")

我可以确认这适用于Npgsql 3.1.7与EntityFramework6.Npgsql 3.1.1,并将保存和加载适用的实体没有问题.无法担保早期版本.

点赞