实体框架Oracle 00932错误“预期-得到NCLOB”

Question

这确实使我发疯。如下面的图片所示，我创建了一个表格：

这是User实体的流畅配置：

//this is the User entity model class
public class User
{
    public long Id { get; set; }
    public string EmailAddress { get; set; }
    public string HashedPassword { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int IsAdmin { get; set; }
}

public class UserEntityModelBuilder : IEntityModelBuilder
{
    public void Build(DbModelBuilder modelBuilder)
    {
        var config = modelBuilder.Entity<User>();

        config.Property(e => e.Id).HasColumnName("ID");
        config.Property(e => e.EmailAddress).HasColumnName("EMAIL");
        config.Property(e => e.HashedPassword).HasColumnName("PASSWORD");
        config.Property(e => e.FirstName).HasColumnName("NOME");
        config.Property(e => e.LastName).HasColumnName("COGNOME");
        config.Property(e => e.IsAdmin).HasColumnName("ADMIN");

        config.ToTable("UTENTIEROGAZIONE").HasKey(e => e.Id);
    }
}

现在，我正在运行一个非常简单的LINQ语句，只是为了测试登录名，它会抛出以下奇怪的异常消息：

事实是我只使用VARCHAR2字段，我不明白到底发生了什么...任何线索？

编辑（添加了DbContext初始化）：

public BarcodePrinterDbContext(IConnectionStringProvider connectionStringProvider, 
    IEnumerable<IEntityModelBuilder> entityModelBuilders) 
    : base(connectionStringProvider.GetConnectionString())
{
    _entityModelBuilders = entityModelBuilders ?? 
        throw new ArgumentNullException(nameof(entityModelBuilders));

    Database.SetInitializer(
        new NullDatabaseInitializer<BarcodePrinterDbContext>());
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    //setting the schema for Oracle DB
    SchemaSetup.SetupSchema(modelBuilder);

    //registering all entities fluent configurations on the model builder
    foreach (var entityModelBuilder in _entityModelBuilders)
        entityModelBuilder.Build(modelBuilder);

    /*
    * I googled out something on wrong mappings on string types, 
    * so I tried to set all string fields to a maximum of 2000 
    * characters, unfortunately with no success.
    */

    modelBuilder
        .Properties()
        .Where(p => p.PropertyType == typeof(string) &&
                    p.GetCustomAttributes(typeof(MaxLengthAttribute), false).Length == 0)
        .Configure(p => p.HasMaxLength(2000));
}

Answer 1

仅供参考，这全都与目标架构设置有关：我正在向旧的SchemaSetup对象注入不同的架构，而不是“ IMPEGNATIVE”。不幸的是，我能够对它运行查询，因为我对db用户设置了各种特权，因此出现了错误（该其他模式中的表实际上有个NCLOB字段）。

因此，请始终检查您的目标架构！