C# MappingEntity类代码示例

 public override string GetColumnDbType(MappingEntity entity, MemberInfo member)
 {
     AttributeMappingMember mm = ((AttributeMappingEntity)entity).GetMappingMember(member.Name);
     if (mm != null && mm.Column != null && !string.IsNullOrEmpty(mm.Column.DbType))
         return mm.Column.DbType;
     return null;
 }

		public override bool IsAssociationRelationship(MappingEntity entity, MemberInfo member)
		{
			if (IsMapped(entity, member) && !IsColumn(entity, member))
			{
				Type otherType = TypeHelper.GetElementType(TypeHelper.GetMemberType(member));
				return !this.IsScalar(otherType);
			}
			return false;
		}

 public override IEnumerable<MemberInfo> GetAssociationKeyMembers(MappingEntity entity, MemberInfo member)
 {
     AttributeMappingEntity thisEntity = (AttributeMappingEntity)entity;
     AttributeMappingMember mm = thisEntity.GetMappingMember(member.Name);
     if (mm != null && mm.Association != null)
     {
         return this.GetReferencedMembers(thisEntity, mm.Association.KeyMembers, "Association.KeyMembers", thisEntity.EntityType);
     }
     return base.GetAssociationKeyMembers(entity, member);
 }

		public override bool IsPrimaryKey(MappingEntity entity, MemberInfo member)
		{
			// Customers has CustomerID, Orders has OrderID, etc
			if (this.IsColumn(entity, member))
			{
				string name = NameWithoutTrailingDigits(member.Name);
				return member.Name.EndsWith("ID")
				       && member.DeclaringType.Name.StartsWith(member.Name.Substring(0, member.Name.Length - 2));
			}
			return false;
		}

 public override bool IsPrimaryKey(MappingEntity entity, MemberInfo member)
 {
     // Customers has CustomerID, Orders has OrderID, etc
     //if (this.IsColumn(entity, member)) 
     //{
     //    string name = NameWithoutTrailingDigits(member.Name);
     //    return member.Name.EndsWith("ID") && member.DeclaringType.Name.StartsWith(member.Name.Substring(0, member.Name.Length - 2)); 
     //}
     //return false;
     //TODO: 2010-7.17 更改 获取主键的方式;
     return base.IsPrimaryKey(entity, member);
 }

 public override bool IsNestedEntity(MappingEntity entity, MemberInfo member)
 {
     AttributeMappingMember mm = ((AttributeMappingEntity)entity).GetMappingMember(member.Name);
     return mm != null && mm.NestedEntity != null;
 }

        /// <summary>
        /// Generate a SQL SELECT distinct for the specific mapping using the Dataset query
        /// </summary>
        /// <param name="mapping">
        /// The mapping to generate the SQL for
        /// </param>
        /// <param name="sqlWhere">
        /// The SQL Query WHERE keyword and where clauses or empty
        /// </param>
        /// <returns>
        /// String with the SQL Query
        /// </returns>
        private string GenerateSql(MappingEntity mapping, string sqlWhere)
        {
            var columnList = new StringBuilder();
            foreach (DataSetColumnEntity col in mapping.Columns)
            {
                columnList.AppendFormat(" {0},", col.Name);
            }

            columnList.Length = columnList.Length - 1;
            return string.Format(
                CultureInfo.InvariantCulture, 
                "SELECT DISTINCT {2} \n FROM ({0}) virtualDataset {1} \n ORDER BY {2} ", 
                this._innerSqlQuery, 
                sqlWhere, 
                columnList);
        }

		private void GetAssociationKeys(
			MappingEntity entity, MemberInfo member, out List<MemberInfo> keyMembers, out List<MemberInfo> relatedKeyMembers)
		{
			MappingEntity entity2 = GetRelatedEntity(entity, member);

			// find all members in common (same name)
			var map1 = this.GetMappedMembers(entity).Where(m => this.IsColumn(entity, m)).ToDictionary(m => m.Name);
			var map2 = this.GetMappedMembers(entity2).Where(m => this.IsColumn(entity2, m)).ToDictionary(m => m.Name);
			var commonNames = map1.Keys.Intersect(map2.Keys).OrderBy(k => k);
			keyMembers = new List<MemberInfo>();
			relatedKeyMembers = new List<MemberInfo>();
			foreach (string name in commonNames)
			{
				keyMembers.Add(map1[name]);
				relatedKeyMembers.Add(map2[name]);
			}
		}

		public override bool IsRelationshipTarget(MappingEntity entity, MemberInfo member)
		{
			if (IsAssociationRelationship(entity, member))
			{
				if (typeof(IEnumerable).IsAssignableFrom(TypeHelper.GetMemberType(member)))
				{
					return true;
				}

				// is target of relationship if the assoctions keys are the same as this entities primary key
				var pks = new HashSet<string>(this.GetPrimaryKeyMembers(entity).Select(m => m.Name));
				var keys = new HashSet<string>(this.GetAssociationKeyMembers(entity, member).Select(m => m.Name));
				return keys.IsSubsetOf(pks) && pks.IsSubsetOf(keys);
			}
			return false;
		}

 /// <summary>
 /// 获取列别名
 /// </summary>
 /// <param name="entity"></param>
 /// <param name="member"></param>
 /// <returns></returns>
 public override string GetAlias(MappingEntity entity, MemberInfo member)
 {
     AttributeMappingMember mm = ((AttributeMappingEntity)entity).GetMappingMember(member.Name);
     return (mm != null && mm.Column != null) ? mm.Column.Alias : null;
 }

 /// <summary>
 /// Gets the key member.
 /// </summary>
 /// <param name="entity">The entity.</param>
 /// <param name="member">The member.</param>
 /// <returns></returns>
 private bool GetKeyMember(MappingEntity entity, MemberInfo member)
 {
     var a = member.GetCustomAttribute<AssociationAttribute>(false);
     return a.Any(p => p.RelatedEntityID == entity.TableId.IfEmptyReplace(entity.EntityType.Name));
 }

        private void GetAssociationRelatedKey(MappingEntity entity, MemberInfo member, out List<MemberInfo> relatedKeyMembers)
        {
            //TODO: 2010 - 7- 17 获取 外键引用列
            MappingEntity entity2 = GetRelatedEntity(entity, member);

            //  
            var map1 = this.GetMappedMembers(entity).Where(m => this.IsColumn(entity, m) ).ToDictionary(m => m.Name);
            var map2 = this.GetMappedMembers(entity2).Where(m => this.IsColumn(entity2, m) ).ToDictionary(m => m.Name);

            var keyMembers = new List<MemberInfo>();
            relatedKeyMembers = new List<MemberInfo>();
            //TODO:这边可能暂时有问题 ...待发现.. ..2010-7-17
            //var ats = map1.Values.Where(p => GetKeyMember(entity2, p)).ToList();
            var ats2 = map2.Values.Where(p => GetKeyMember(entity, p)).ToList();
            //if (ats.Count() > 0)
            //    keyMembers.AddRange(ats);//
            if (ats2.Count() > 0)
                relatedKeyMembers.AddRange(ats2);
            // 获取标记了 
            //[Association(Member = "Users", KeyMembers = "RoleID", RelatedEntityID = "Users", RelatedKeyMembers = "RoleID")]
            //的信息
            if (relatedKeyMembers.Count == 0)//&& keyMembers.Count == 0
            {
                var commonNames = map1.Keys.Intersect(map2.Keys).OrderBy(k => k);
                foreach (string name in commonNames)
                {
                    //keyMembers.Add(map1[name]);//
                    relatedKeyMembers.Add(map2[name]);
                }
            }
        }

		public override string GetColumnName(MappingEntity entity, MemberInfo member)
		{
			AttributeMappingMember mm = ((AttributeMappingEntity)entity).GetMappingMember(member.Name);
			if (mm != null && mm.Column != null && !string.IsNullOrEmpty(mm.Column.Name))
			{
				return mm.Column.Name;
			}
			return base.GetColumnName(entity, member);
		}

        /// <summary>
        /// Initialize component mappings for coded components and time dimension used in mappings in the dataflow
        /// </summary>
        /// <param name="dataflowRef">
        /// The dataflow Ref.
        /// </param>
        /// <remarks>
        /// This method should be called only once
        /// </remarks>
        private void Initialize(Sdmx.Model.Registry.DataflowRefBean dataflowRef)
        {
            this._mappingSet = DataAccess.GetMappingSet(
                this._connectionStringSettings, 
                dataflowRef.Id, 
                dataflowRef.Version, 
                dataflowRef.AgencyID, 
                this._allowedDataflows);
            if (this._mappingSet == null)
            {
                return;
            }

            NormallizeDatabaseProvider(this._connectionStringSettings);
            this._mastoreAccess = new StructureAccess(this._connectionStringSettings);
            this._xsMeasureDimensionConstraints.Clear();

            this._componentMapping = new Dictionary<string, ComponentInfo>(this._mappingSet.Mappings.Count);
            this._innerSqlQuery = this._mappingSet.DataSet.Query;
            this._measureComponent = null;
            this._timeTranscoder = null;
            this._timeMapping = null;
            this._timeDimension = null;
            bool measureDimensionMapped = false;

            foreach (MappingEntity mapping in this._mappingSet.Mappings)
            {
                foreach (ComponentEntity component in mapping.Components)
                {
                    if (component.ComponentType == SdmxComponentType.TimeDimension)
                    {
                        this._timeTranscoder = TimeDimensionMapping.Create(
                            mapping, this._mappingSet.DataSet.Connection.DBType);
                        this._timeMapping = mapping;
                        this._timeDimension = component.Concept.Id;
                    }
                    else if (component.CodeList != null)
                    {
                        if (component.MeasureDimension)
                        {
                            measureDimensionMapped = true;
                        }

                        var compInfo = new ComponentInfo();
                        compInfo.Mapping = mapping;
                        compInfo.ComponentMapping = ComponentMapping.CreateComponentMapping(component, mapping);
                        compInfo.CodelistRef.Id = component.CodeList.Id;
                        compInfo.CodelistRef.Version = component.CodeList.Version;
                        compInfo.CodelistRef.AgencyID = component.CodeList.Agency;
                        this._componentMapping.Add(component.Concept.Id, compInfo);
                    }
                }
            }

            if (!measureDimensionMapped)
            {
                foreach (ComponentEntity component in this._mappingSet.Dataflow.Dsd.Dimensions)
                {
                    if (component.MeasureDimension)
                    {
                        this._measureComponent = component.Concept.Id;
                    }
                }

                foreach (ComponentEntity xsMeasure in this._mappingSet.Dataflow.Dsd.CrossSectionalMeasures)
                {
                    this._xsMeasureDimensionConstraints.Add(xsMeasure.Concept.Id, xsMeasure);
                }
            }
        }

 public override MappingEntity GetRelatedEntity(MappingEntity entity, MemberInfo member)
 {
     AttributeMappingEntity thisEntity = (AttributeMappingEntity)entity;
     AttributeMappingMember mm = thisEntity.GetMappingMember(member.Name);
     if (mm != null)
     {
         if (mm.Association != null)
         {
             Type elementType = TypeHelper.GetElementType(TypeHelper.GetMemberType(member));
             Type entityType = (mm.Association.RelatedEntityType != null) ? mm.Association.RelatedEntityType : elementType;
             return this.GetReferencedEntity(elementType, mm.Association.RelatedEntityID, entityType, "Association.RelatedEntityID");
         }
         else if (mm.NestedEntity != null)
         {
             return mm.NestedEntity;
         }
     }
     return base.GetRelatedEntity(entity, member);
 }