Sybase Powerdesigner Conceptual Data Model 分析器

Sybase PowerDesigner是一个卓越的数据建模工具，它用Physical model描述特定数据库的数据模型，用Conceptual Model更抽象的描述数据库无关的数据模型。我们可以从概念模型入手进行建型，再根据不同的需要生成物理模型，进而生成库结构。也可以从现有数据库导出物理模型再转换成概念模型，然后转换成另一种数据库的物理模型......
在使用程序生成持久层的实体类和描述文件的时候，使用概念模型可以避免直接与不同的数据库打交道，当时代价是需要花点时间从数据库导出物理模型再转换成概念模型。下文提供分析Sybase CDM文件的代码，作为实体类生成工具的一个扩展。
首先是定义存储概念模型的类。

import namespaces#region import namespaces
using System;
using System.Collections;

using NBool = Nullables.NullableBoolean;
using NByte = Nullables.NullableByte;
using NDateTime = Nullables.NullableDateTime;
using NDecimal = Nullables.NullableDecimal;
using NDouble = Nullables.NullableDouble;
using NGuid = Nullables.NullableGuid;
using NInt16 = Nullables.NullableInt16;
using NInt32 = Nullables.NullableInt32;
using NInt64 = Nullables.NullableInt64;
using NSbyte = Nullables.NullableSByte;
using NSingle = Nullables.NullableSingle;

using Generator;
#endregion


namespace Generator.Utils.CDM {
    /**//// <summary>
    /// Entity 的摘要说明。
    /// </summary>
    public class Entity {

        properties#region properties
        
        protected int _id;
        public int ID {
            get {
                return this._id;
            }
            set {
                this._id = value;
            }
        }


        protected string _code;
        public string Code {
            get {
                return this._code;
            }
            set {
                this._code = value;
            }
        }
        
        
        protected string _name;
        public string Name {
            get {
                return this._name;
            }
            set {
                this._name = value;
            }
        }
        
        
        protected string _comment;
        public string Comment {
            get {
                return this._comment;
            }
            set {
                this._comment = value;
            }
        }


        protected string _objectID;
        public string ObjectID {
            get {
                return this._objectID;
            }
            set {
                this._objectID = value;
            }
        }
        
        
        protected Entity _parentEntity;
        public Entity ParentEntity {
            get {
                return this._parentEntity;
            }
            set {
                this._parentEntity = value;
            }
        }


        protected IList _entityAttributes = new ArrayList();
        public IList EntityAttributes {
            get {
                return this._entityAttributes;
            }
            set {
                this._entityAttributes = value;
            }
        }


        protected IList _entityIdentifiers = new ArrayList();
        public IList EntityIdentifiers {
            get {
                return this._entityIdentifiers;
            }
            set {
                this._entityIdentifiers = value;
            }
        }


        protected IList _fromEntityRelationships = new ArrayList();
        public IList FromEntityRelationships {
            get {
                return this._fromEntityRelationships;
            }
            set {
                this._fromEntityRelationships = value;
            }
        }

        
        protected IList _toEntityRelationships = new ArrayList();
        public IList ToEntityRelationships {
            get {
                return this._toEntityRelationships;
            }
            set {
                this._toEntityRelationships = value;
            }
        }

        
        public EntityIdentifier PrimaryIdentifier {
            get {
                foreach( object obj in this.EntityIdentifiers ) {
                    EntityIdentifier identifier = (EntityIdentifier)obj;
                    if( identifier.IsPrimaryKey.Value ) {
                        return identifier;
                    }
                }
                return null;
            }
        }
        
        
        protected IList _childEntities = new ArrayList();
        public IList ChildEntities {
            get {
                return this._childEntities;
            }
        }


        protected IList _siblingEntities = new ArrayList();
        public IList Siblings {
            get {
                return this._siblingEntities;
            }
        }


        #endregion

        public Entity() {
        }
    }
    public class DataItem {
        
        properties#region properties
        protected string _objectID;
        public string ObjectID {
            get {
                return this._objectID;
            }
            set {
                this._objectID = value;
            }
        }

        
        protected string _code;
        public string Code {
            get {
                return this._code;
            }
            set {
                this._code = value;
            }
        }


        protected string _name;
        public string Name {
            get {
                return this._name;
            }
            set {
                this._name = value;
            }
        }


        protected string _comment;
        public string Comment {
            get {
                return this._comment;
            }
            set {
                this._comment = value;
            }
        }
        
        
        protected string _dataType;
        public string DataType {
            get {
                return this._dataType;
            }
            set {
                this._dataType = value;
            }
        }
        
        
        protected NInt32 _length;
        public NInt32 Length {
            get {
                return this._length;
            }
            set {
                this._length = value;
            }
        }
        
        
        protected NInt32 _precision;
        public NInt32 Precision {
            get {
                return this._precision;
            }
            set {
                this._precision = value;
            }
        }
        
        
        protected string _defaultValue;
        public string DefaultValue {
            get {
                return this._defaultValue;
            }
            set {
                this._defaultValue = value;
            }
        }
        

        protected string _minValue;
        public string MinValue {
            get {
                return this._minValue;
            }
            set {
                this._minValue = value;
            }
        }
        

        protected string _maxValue;
        public string MaxValue {
            get {
                return this._maxValue;
            }
            set {
                this._maxValue = value;
            }
        }
        
        
        protected IList _entityAttributes = new ArrayList();
        public IList EntityAttributes {
            get {
                return this._entityAttributes;
            }
            set {
                this._entityAttributes = value;
            }
        }


        #endregion

        
        public DataItem() {
        }

    }
    public class EntityAttribute {

        properties#region properties
        protected string _objectID;
        public string ObjectID {
            get {
                return this._objectID;
            }
            set {
                this._objectID = value;
            }
        }


        protected IList _entities = new ArrayList();
        public IList Entities {
            get {
                return this._entities;
            }
            set {
                this._entities = value;
            }
        }


        protected DataItem _dataItem;
        public DataItem DataItem {
            get {
                return this._dataItem;
            }
            set {
                this._dataItem = value;
            }
        }


        protected NBool _isMandatory;
        public NBool IsMandatory {
            get {
                return this._isMandatory;
            }
            set {
                this._isMandatory = value;
            }
        }
        
        protected NBool _isSequence = false;
        public NBool IsSequence {
            get {
                return this._isSequence;
            }
            set {
                this._isSequence = value;
            }
        }
        
        
        #endregion

        public EntityAttribute() {
        }
    }
    public class EntityIdentifier {

        properties#region properties
        protected string _code;
        public string Code {
            get {
                return this._code;
            }
            set {
                this._code = value;
            }
        }
        
        
        protected string _name;
        public string Name {
            get {
                return this._name;
            }
            set {
                this._name = value;
            }
        }
        
        
        protected NBool _isPrimaryKey;
        public NBool IsPrimaryKey {
            get {
                return this._isPrimaryKey;
            }
            set {
                this._isPrimaryKey = value;
            }
        }


        protected string _objectID;
        public string ObjectID {
            get {
                return this._objectID;
            }
            set {
                this._objectID = value;
            }
        }
        
        
        protected Entity _entity;
        public Entity Entity {
            get {
                return this._entity;
            }
            set {
                this._entity = value;
            }
        }


        private IList _entityAttributes = new ArrayList();
        public IList EntityAttributes {
            get {
                return this._entityAttributes;
            }
            set {
                this._entityAttributes = value;
            }
        }
        #endregion

        public EntityIdentifier() {
        }
    }
    public class EntityRelationship {

        properties#region properties
        protected string _objectID;
        public string ObjectID {
            get {
                return this._objectID;
            }
            set {
                this._objectID = value;
            }
        }


        protected Entity _entity1;
        public Entity Entity1 {
            get {
                return this._entity1;
            }
            set {
                this._entity1 = value;
            }
        }
        
        
        protected Entity _entity2;
        public Entity Entity2 {
            get {
                return this._entity2;
            }
            set {
                this._entity2 = value;
            }
        }
        
        
        protected string _name;
        public string Name {
            get {
                return this._name;
            }
            set {
                this._name = value;
            }
        }


        protected string _code;
        public string Code {
            get {
                return this._code;
            }
            set {
                this._code = value;
            }
        }


        protected int _entity1CardinalityMin;
        public int Entity1CardinalityMin {
            get {
                return this._entity1CardinalityMin;
            }
            set {
                this._entity1CardinalityMin = value;
            }
        }


        protected int _entity1CardinalityMax;
        public int Entity1CardinalityMax {
            get {
                return this._entity1CardinalityMax;
            }
            set {
                this._entity1CardinalityMax = value;
            }
        }


        protected int _entity2CardinalityMin;
        public int Entity2CardinalityMin {
            get {
                return this._entity2CardinalityMin;
            }
            set {
                this._entity2CardinalityMin = value;
            }
        }


        protected int _entity2CardinalityMax;
        public int Entity2CardinalityMax {
            get {
                return this._entity2CardinalityMax;
            }
            set {
                this._entity2CardinalityMax = value;
            }
        }


        protected EntityRelationshipTypes _relationshipType;
        public EntityRelationshipTypes RelationshipType {
            get {
                return this._relationshipType;
            }
            set {
                this._relationshipType = value;
            }
        }


        #endregion
        
        public EntityRelationship() {
        }
    }
    public class ConceptualDataModel {

        properties#region properties
        private IDictionary _entities = new Hashtable();
        public IDictionary Entities {
            get {
                return this._entities;
            }
            set {
                this._entities = value;
            }
        }


        private IDictionary _dataItems = new Hashtable();
        public IDictionary DataItems {
            get {
                return this._dataItems;
            }
            set {
                this._dataItems = value;
            }
        }


        private IDictionary _attributes = new Hashtable();
        public IDictionary Attributes {
            get {
                return this._attributes;
            }
            set {
                this._attributes = value;
            }
        }


        private IDictionary _identifiers = new Hashtable();
        public IDictionary Identifiers {
            get {
                return this._identifiers;
            }
            set {
                this._identifiers = value;
            }
        }


        private IDictionary _relationships = new Hashtable();
        public IDictionary Relationships {
            get {
                return this._relationships;
            }
            set {
                this._relationships = value;
            }
        }


        #endregion

        public ConceptualDataModel() {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }
    }


}

然后是分析CDM文件的工具类

import namespaces#region import namespaces
using System;
using System.Xml;
using System.Collections;

using Generator.Utils.CDM;

using NBool = Nullables.NullableBoolean;
using NByte = Nullables.NullableByte;
using NDateTime = Nullables.NullableDateTime;
using NDecimal = Nullables.NullableDecimal;
using NDouble = Nullables.NullableDouble;
using NGuid = Nullables.NullableGuid;
using NInt16 = Nullables.NullableInt16;
using NInt32 = Nullables.NullableInt32;
using NInt64 = Nullables.NullableInt64;
using NSbyte = Nullables.NullableSByte;
using NSingle = Nullables.NullableSingle;

using System.Diagnostics;
#endregion

namespace Generator.Utils {
    public delegate void ProgressStatus( String message);

    public class SybaseCDMParser {

        StatusChanged event#region StatusChanged event
        public event ProgressStatus StatusChanged;
        protected virtual void OnStatusChanged( String message ) {
            if( StatusChanged != null ) {
                StatusChanged( message );
            }
        }

        #endregion

        local variables#region local variables
        protected XmlDocument _cdmDocument;
        protected XmlNamespaceManager _nsmgr;
        #endregion

        properties#region properties
        private ConceptualDataModel _model = new ConceptualDataModel();
        #endregion
        
        constructors#region constructors
        public SybaseCDMParser( string conceptualDataModelFilePath ) {
            this._cdmDocument = new XmlDocument();
            this.OnStatusChanged( "正加载文件" );
            this._cdmDocument.Load( conceptualDataModelFilePath );
            this.OnStatusChanged("成功加载文件.");
            this._nsmgr = new XmlNamespaceManager( this._cdmDocument.NameTable );
            this._nsmgr.AddNamespace("c", "collection");
            this._nsmgr.AddNamespace("o", "object");
            this._nsmgr.AddNamespace("a", "attribute");
        }

        #endregion
        
        public methods#region public methods
        public virtual ConceptualDataModel processCDM() {
            this.GetEntities();
            this.GetDataItems();

            foreach( object entityOID in this._model.Entities.Keys ) {
                Entity entity = (Entity)this._model.Entities[ entityOID ];
                entity = this.GetEntityAttributes( entity );
            }
            
            foreach( object entityOID in this._model.Entities.Keys ) {
                Entity entity = (Entity)this._model.Entities[ entityOID ];
                entity = this.GetEntityIdentifiers( entity );
            }
            
            this.GetEntityRelationships();
            
            return this._model;
        }

        #endregion
        
        helper methods#region helper methods
        protected void GetEntities() {
            this.OnStatusChanged("开始处理实体(entities)");

            XmlDocument xDoc = this._cdmDocument;

            XmlNode entityNodes = xDoc.SelectSingleNode( "//c:Entities", this._nsmgr );
            
            foreach( XmlNode entityNode in entityNodes.ChildNodes ) {
                Entity entity = new Entity();

                entity.ObjectID = entityNode.Attributes.GetNamedItem( "Id" ).Value;
                entity.Code = this.GetXmlNodeInnerTextAsString( entityNode, "a:Code" );
                entity.Name = this.GetXmlNodeInnerTextAsString( entityNode, "a:Name" );
                entity.Comment = this.GetXmlNodeInnerTextAsString( entityNode, "a:Comment" );

                this._model.Entities.Add( entity.ObjectID, entity );
                this.OnStatusChanged( entity.Code );
            }
            this.OnStatusChanged("实体(entities)处理结束.");
        }
    
    
        protected void GetDataItems() {
            this.OnStatusChanged("开始处理数据项(dataitems)");

            XmlNode dataItemNodes = this._cdmDocument.SelectSingleNode( "//c:DataItems", this._nsmgr );
            
            foreach( XmlNode dataItemNode in dataItemNodes.ChildNodes ) {
                DataItem dataitem = new DataItem();
                
                dataitem.ObjectID = dataItemNode.Attributes.GetNamedItem( "Id" ).Value;
                dataitem.Code = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:Code" );
                dataitem.Name = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:Name" );
                dataitem.Comment = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:Comment" );
                dataitem.DataType = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:DataType" );
                dataitem.MinValue = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:LowValue" );
                dataitem.MaxValue = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:HighValue" );
                dataitem.DefaultValue = this.GetXmlNodeInnerTextAsString( dataItemNode, "a:DefaultValue" );
                try {
                    dataitem.Length = Int32.Parse( this.GetXmlNodeInnerTextAsString( dataItemNode, "a:Length" ) );
                } catch {
                    dataitem.Length = null;
                }
                try {
                    dataitem.Precision = Int32.Parse( this.GetXmlNodeInnerTextAsString( dataItemNode, "a:Precision" ) );
                } catch {
                    dataitem.Precision = null;
                }

                String temp = dataitem.DataType;
                if( dataitem.Length != null ) {
                    temp = temp.Replace( dataitem.Length.Value.ToString(), String.Empty );
                }
                if( dataitem.Precision != null ) {
                    temp = temp.Replace( dataitem.Precision.Value.ToString(), String.Empty );
                }
                temp = temp.Replace( ",", String.Empty );
                dataitem.DataType = temp;
                
                this._model.DataItems.Add( dataitem.ObjectID, dataitem );
                this.OnStatusChanged( dataitem.Code );
            }
            this.OnStatusChanged("数据项(dataitems)处理结束.");
        }
    
        
        protected Entity GetEntityAttributes(Entity entity ) {
            this.OnStatusChanged("开始处理实体属性(attributes)");
            XmlNodeList attributeNodes = this._cdmDocument.SelectNodes( 
                String.Format( "//c:Entities/o:Entity[@Id='{0}']/c:Attributes/*", entity.ObjectID ), this._nsmgr );
            
            foreach( XmlNode attributeNode in attributeNodes ) {
                EntityAttribute attr = new EntityAttribute();
                DataItem dataItem = null;

                String relDataItemObjectID = attributeNode.SelectSingleNode( "c:DataItem/o:DataItem/@Ref", this._nsmgr ).InnerText;
                dataItem = (DataItem)this._model.DataItems[ relDataItemObjectID ];

                attr.ObjectID = attributeNode.Attributes.GetNamedItem( "Id" ).Value;
                attr.DataItem = dataItem;
                if( attributeNode.SelectSingleNode( "a:Mandatory", this._nsmgr ) != null &&
                    attributeNode.SelectSingleNode( "a:Mandatory", this._nsmgr ).InnerText != null ) {
                    attr.IsMandatory = ( attributeNode.SelectSingleNode( "a:Mandatory", this._nsmgr ).InnerText == "1" );
                }  else {
                    attr.IsMandatory = false;
                }
                
                attr.IsSequence = dataItem.DataType.Trim().ToUpper().Equals( "NO".ToUpper() );
            
                entity.EntityAttributes.Add( attr );
                this._model.Attributes.Add( attr.ObjectID, attr );
                this.OnStatusChanged(entity.Code + " - " + attr.DataItem.Code);
            }
            this.OnStatusChanged("实体属性(attributes)处理结束.");
            return entity;

        }
    
        
        protected Entity GetEntityIdentifiers( Entity entity ) {
            this.OnStatusChanged("开始处理实体键(Identifiers)");

            XmlNodeList identifierNodes = this._cdmDocument.SelectNodes( 
                String.Format( "//c:Entities/o:Entity[@Id='{0}']/c:Identifiers/*", entity.ObjectID ), this._nsmgr );
            
            foreach( XmlNode identifierNode in identifierNodes ) {
                EntityIdentifier identifier = new EntityIdentifier();
                EntityAttribute attr = null;
                
                identifier.ObjectID = identifierNode.Attributes.GetNamedItem( "Id" ).Value;
                identifier.Code = identifierNode.SelectSingleNode( "a:Code", this._nsmgr ).InnerText;
                identifier.Name = identifierNode.SelectSingleNode( "a:Name", this._nsmgr ).InnerText;
                identifier.Entity = entity;
                
                XmlNodeList relAttrs = identifierNode.SelectNodes( "c:Identifier.Attributes/*", this._nsmgr );

                foreach( XmlNode relAttr in relAttrs ) {
                    String relAttrObjectID = relAttr.Attributes.GetNamedItem( "Ref" ).Value;

                    attr = (EntityAttribute)this._model.Attributes[ relAttrObjectID ];

                    identifier.EntityAttributes.Add( attr );

                }
                
                identifier.IsPrimaryKey = this.IsPrimaryIdentifier( identifier.Entity.ObjectID, identifier.ObjectID );
                
                entity.EntityIdentifiers.Add( identifier );
                this._model.Identifiers.Add( identifier.ObjectID, identifier );
                this.OnStatusChanged(entity.Code + " - " + identifier.Code);
            }
            this.OnStatusChanged("实体键(Identifiers)处理结束.");

            return entity;

        }

        
        protected void GetEntityRelationships() {
            this.OnStatusChanged("开始处理实体关系(relationships)");
            XmlNodeList relationshipNodes = this._cdmDocument.SelectNodes( "//c:Relationships/*", this._nsmgr );

            foreach( XmlNode relationshipNode in relationshipNodes ) {
                EntityRelationship relationship = new EntityRelationship();

                relationship.ObjectID = relationshipNode.Attributes.GetNamedItem( "Id" ).Value;
                relationship.Code = relationshipNode.SelectSingleNode( "a:Code", this._nsmgr ).InnerText;
                relationship.Name = relationshipNode.SelectSingleNode( "a:Name", this._nsmgr ).InnerText;

                String entity1ObjectID = relationshipNode.SelectSingleNode( "c:Object1/o:Entity/@Ref", this._nsmgr ).InnerText;
                String entity2ObjectID = relationshipNode.SelectSingleNode( "c:Object2/o:Entity/@Ref", this._nsmgr ).InnerText;

                Entity entity1 = (Entity)this._model.Entities[ entity1ObjectID ];
                Entity entity2 = (Entity)this._model.Entities[ entity2ObjectID ];

                relationship.Entity1 = entity1;
                relationship.Entity2 = entity2;

                String e1Cardinality =    relationshipNode.SelectSingleNode( "a:Entity2ToEntity1RoleCardinality", this._nsmgr ).InnerText;
                String e2Cardinality =    relationshipNode.SelectSingleNode( "a:Entity1ToEntity2RoleCardinality", this._nsmgr ).InnerText;

                String e1cMin = e1Cardinality.Split( ',' )[0];
                String e1cMax = e1Cardinality.Split( ',' )[1];
                String e2cMin = e2Cardinality.Split( ',' )[0];
                String e2cMax = e2Cardinality.Split( ',' )[1];

                if( e1cMin.Equals( "n" ) ) {
                    relationship.Entity1CardinalityMin = Int32.MaxValue;
                } else {
                    relationship.Entity1CardinalityMin = Int32.Parse( e1cMin );
                }
                if( e1cMax.Equals( "n" ) ) {
                    relationship.Entity1CardinalityMax = Int32.MaxValue;
                } else {
                    relationship.Entity1CardinalityMax = Int32.Parse( e1cMax );
                }
                if( e2cMin.Equals( "n" ) ) {
                    relationship.Entity2CardinalityMin = Int32.MaxValue;
                } else {
                    relationship.Entity2CardinalityMin = Int32.Parse( e2cMin );
                }
                if( e2cMax.Equals( "n" ) ) {
                    relationship.Entity2CardinalityMax = Int32.MaxValue;
                } else {
                    relationship.Entity2CardinalityMax = Int32.Parse( e2cMax );
                }

                if( relationship.Entity1CardinalityMax == 1 && relationship.Entity2CardinalityMax == 1 ) {
                    relationship.RelationshipType = EntityRelationshipTypes.OneToOne;
                } else if( relationship.Entity1CardinalityMax > 1 && relationship.Entity2CardinalityMax > 1 ) {
                    relationship.RelationshipType = EntityRelationshipTypes.ManyToMany;
                } else if( relationship.Entity1CardinalityMax == 1 && relationship.Entity2CardinalityMin > 1 ){
                    relationship.RelationshipType = EntityRelationshipTypes.OneToMany;
                } else {
                    relationship.RelationshipType = EntityRelationshipTypes.ManyToOne;
                }

                this._model.Relationships.Add( relationship.ObjectID, relationship );

                entity1.FromEntityRelationships.Add( relationship );
                entity2.ToEntityRelationships.Add( relationship );

                EntityAttribute tempAttr = null;

                switch( (EntityRelationshipTypes)relationship.RelationshipType )    {
                    case EntityRelationshipTypes.OneToOne :
                        foreach( object obj in entity2.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity1.EntityAttributes.Add(tempAttr);
                        }
                        foreach( object obj in entity1.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity2.EntityAttributes.Add(tempAttr);
                        }

                        entity1.Siblings.Add( entity2 );
                        entity2.Siblings.Add( entity1 );
                        break;
                    case  EntityRelationshipTypes.OneToMany :
                        foreach( object obj in entity1.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity2.EntityAttributes.Add(tempAttr);
                        }

                        entity1.ChildEntities.Add( entity2 );
                        entity2.Siblings.Add( entity1 );
                        break;
                    case  EntityRelationshipTypes.ManyToOne :
                        foreach( object obj in entity2.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity1.EntityAttributes.Add(tempAttr);
                        }

                        entity1.Siblings.Add( entity2 );
                        entity2.ChildEntities.Add( entity1 );
                        break;
                    case  EntityRelationshipTypes.ManyToMany :
                        foreach( object obj in entity2.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity1.EntityAttributes.Add(tempAttr);
                        }
                        foreach( object obj in entity1.PrimaryIdentifier.EntityAttributes ) {
                            tempAttr = (EntityAttribute)obj;
                            entity2.EntityAttributes.Add(tempAttr);
                        }

                        entity1.ChildEntities.Add( entity2 );
                        entity2.ChildEntities.Add( entity1 );
                        break;
                    default :
                        break;
                }

                this._model.Entities[ entity1ObjectID ] = entity1;
                this._model.Entities[ entity2ObjectID ] = entity2;

                this.OnStatusChanged( relationship.Code );
            }
            this.OnStatusChanged("实体关系(relationships)处理结束.");
        }
        
        
        private bool IsPrimaryIdentifier( String entityObjectID, String identifierObjectID ) {
            XmlNode primary = this._cdmDocument.SelectSingleNode( 
                String.Format( "//c:Entities/o:Entity[@Id='{0}']/c:PrimaryIdentifier/o:Identifier[@Ref='{1}']", entityObjectID, identifierObjectID), 
                this._nsmgr );
            return ( primary != null );
        }


        private String GetXmlNodeInnerTextAsString( XmlNode node, string xPathExp ) {
            if( node == null ) {
                return null;
            }

            if( node.SelectSingleNode( xPathExp, this._nsmgr ) == null ) {
                return null;
            }

            return node.SelectSingleNode( xPathExp, this._nsmgr ).InnerText;
        }

        
        #endregion
    
    }
}

最后是调用的示例代码：

            SybaseCDMParser parser = new SybaseCDMParser( fileName );
            parser.StatusChanged += new ProgressStatus(this.parser_StatusChanged);
            ConceptualDataModel model = parser.processCDM();

            foreach( object obj in model.Entities.Values ) {
                String entityString = String.Empty;
                Entity entity = (Entity)obj;

                entityString += "Entity Code:" + entity.Code + ", Entity Name:" + entity.Name + "\r\n Attributes: ";
                foreach( object attrObj in entity.EntityAttributes ) {
                    EntityAttribute attr = (EntityAttribute)attrObj;
                    entityString += attr.DataItem.Code + "[" + attr.IsMandatory.ToString() + "], ";
                }
                entityString += "\r\n Identifiers:";

                foreach( object idenObj in entity.EntityIdentifiers ) {
                    EntityIdentifier iden = (EntityIdentifier)idenObj;
                    entityString += iden.Code + "[" + iden.IsPrimaryKey.ToString() + "], ";
                }
                
                entityString += "\r\n Relationships:";
                foreach( object relObj in entity.FromEntityRelationships ) {
                    EntityRelationship rel = (EntityRelationship)relObj;
                    entityString += rel.Code + "[" + rel.Entity1.Code + "], ";
                }
                entityString += "\r\n";
                foreach( object relObj in entity.ToEntityRelationships ) {
                    EntityRelationship rel = (EntityRelationship)relObj;
                    entityString += rel.Code + "[" + rel.Entity2.Code + "], ";
                }
                entityString += "\r\n";

                this.textBox1.Text += "\r\n" + entityString;