ValidateSchema提供OverflowException

我的表有几个int(11)和int(11)可为空的列。我的域对象具有相同的int和int?财产。

当我运行ValidateSchema时,我得到一个异常,但没有很好的错误消息:

   at System.Convert.ToInt32(UInt64 value)
   at System.UInt64.System.IConvertible.ToInt32(IFormatProvider provider)
   at System.Convert.ToInt32(Object value)
   at NHibernate.Dialect.Schema.MySQLColumnMetadata..ctor(DataRow rs)
   at NHibernate.Dialect.Schema.MySQLTableMetadata.GetColumnMetadata(DataRow rs)
   at NHibernate.Dialect.Schema.AbstractTableMetadata.AddColumn(DataRow rs)
   at NHibernate.Dialect.Schema.AbstractTableMetadata.InitColumns(IDataBaseSchema meta)
   at NHibernate.Dialect.Schema.AbstractTableMetadata..ctor(DataRow rs, IDataBaseSchema meta, Boolean extras)
   at NHibernate.Dialect.Schema.MySQLTableMetadata..ctor(DataRow rs, IDataBaseSchema meta, Boolean extras)
   at NHibernate.Dialect.Schema.MySQLDataBaseSchema.GetTableMetadata(DataRow rs, Boolean extras)
   at NHibernate.Tool.hbm2ddl.DatabaseMetadata.GetTableMetadata(String name, String schema, String catalog, Boolean isQuoted)
   at NHibernate.Cfg.Configuration.ValidateSchema(Dialect dialect, DatabaseMetadata databaseMetadata)
   at NHibernate.Tool.hbm2ddl.SchemaValidator.Validate()

这个方法看起来不像是用反射镜做了什么奇怪的事情:

public MySQLColumnMetadata(DataRow rs) : base(rs)
{
    base.Name = Convert.ToString(rs["COLUMN_NAME"]);
    object obj2 = rs["CHARACTER_MAXIMUM_LENGTH"];
    if (obj2 != DBNull.Value)
    {
        base.ColumnSize = Convert.ToInt32(obj2);
    }
    obj2 = rs["NUMERIC_PRECISION"];
    if (obj2 != DBNull.Value)
    {
        base.NumericalPrecision = Convert.ToInt32(obj2);
    }
    base.Nullable = Convert.ToString(rs["IS_NULLABLE"]);
    base.TypeName = Convert.ToString(rs["DATA_TYPE"]);
}

我还有几个约会时间和约会时间?在我的模型上。我知道mysql上的nhibernate在DateTime上有点奇怪。这可能是问题所在吗?