Data-AddIn/EDMDesigner: Support for composite PKs & FKs (Association resolution buggy)

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@4904 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/DatabaseObjects/Column.cs

@@ -64,15 +64,16 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
                 else
                     allowsNull = "not null";
 
-                if (_parentTable != null && _parentTable.Constraints != null)
+                bool isForeignKey = IsForeignKey;
-                {
+
-                    IConstraint constraint = _parentTable.Constraints.FirstOrDefault(constr => constr.FKColumnName == Name);
+                if (IsPrimaryKey && !isForeignKey)
-
+                    return string.Format("{0} (PK, {1}, {2})", Name, DataType, allowsNull); 
-                    if (constraint != null)
+                else if (!IsPrimaryKey && isForeignKey)
-                        return string.Format("{0} (FK, {1}, {2})", Name, DataType, allowsNull); 
+                    return string.Format("{0} (FK, {1}, {2})", Name, DataType, allowsNull); 
-                }
+                else if (IsPrimaryKey && isForeignKey)
-                
+                    return string.Format("{0} (PK, FK, {1}, {2})", Name, DataType, allowsNull); 
-                return string.Format("{0} ({1}, {2})", Name, DataType, allowsNull); 
+                else
+                    return string.Format("{0} ({1}, {2})", Name, DataType, allowsNull); 
             }
         }
 
@@ -190,7 +191,7 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
         {
             get
             {
-                IConstraint constraint = _parentTable.Constraints.FirstOrDefault(constr => constr.FKColumnName == Name);
+                IConstraint constraint = _parentTable.Constraints.FirstOrDefault(constr => constr.FKColumns.FirstOrDefault(column => column.ColumnId == ColumnId && column.Name == Name) != null);
 
                 if (constraint == null)
                     return false;
@@ -269,6 +270,17 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
             }
         }
 
+        public bool IsUserDefinedDataType
+        {
+            get
+            {
+                if (string.IsNullOrEmpty(_systemType))
+                    return false;
+                else
+                    return true;
+            }
+        }
+
         public bool IsXmlIndexable
         {
             get { return _isXmlIndexable; }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/DatabaseObjects/Constraint.cs

@@ -15,22 +15,22 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
     {
         #region Fields
 
-        private string _pkColumnName = string.Empty;
+        private List<string> _pkColumnNames = new List<string>();
         private string _pkTableName = string.Empty;
-        private string _fkColumnName = string.Empty;
+        private List<string> _fkColumnNames = new List<string>();
         private string _fkTableName = string.Empty;
 
         #endregion
 
         #region Properties
 
-        public string PKColumnName 
+        public List<string> PKColumnNames 
         {
-            get { return _pkColumnName; }
+            get { return _pkColumnNames; }
             set
             {
-                _pkColumnName = value;
+                _pkColumnNames = value;
-                OnPropertyChanged("PKColumnName");
+                OnPropertyChanged("PKColumnNames");
             }
         }
 
@@ -44,13 +44,13 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
             }
         }
 
-        public string FKColumnName 
+        public List<string> FKColumnNames 
         {
-            get { return _fkColumnName; }
+            get { return _fkColumnNames; }
             set
             {
-                _fkColumnName = value;
+                _fkColumnNames = value;
-                OnPropertyChanged("FKColumnName");
+                OnPropertyChanged("FKColumnNames");
             }
         }
 
@@ -64,14 +64,14 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
             }
         }
 
-        public IColumn PKColumn 
+        public DatabaseObjectsCollection<IColumn> PKColumns
         {
             get
             {
                 ITable table = PKTable;
 
                 if (table != null)
-                    return GetColumnFromTableByName(table, PKColumnName);
+                    return GetColumnsFromTableByName(table, PKColumnNames);
                 else
                     return null;
             }
@@ -86,25 +86,27 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
         {
             get
             {
-                if (!FKColumn.IsPrimaryKey && FKColumn.IsNullable)
+                IColumn fkColumn = FKColumns.First();
+
+                if (!fkColumn.IsPrimaryKey && fkColumn.IsNullable)
                     return Cardinality.ZeroToOne;
-                else if (!FKColumn.IsPrimaryKey && !FKColumn.IsNullable)
+                else if (!fkColumn.IsPrimaryKey && !fkColumn.IsNullable)
                     return Cardinality.One;
-                else if (!FKColumn.IsPrimaryKey)
+                else if (!fkColumn.IsPrimaryKey)
                     return Cardinality.Many;
                 else
                     return Cardinality.One;
             }
         }
 
-        public IColumn FKColumn 
+        public DatabaseObjectsCollection<IColumn> FKColumns
         {
             get 
             {
                 ITable table = FKTable;
 
                 if (table != null)
-                    return GetColumnFromTableByName(table, FKColumnName);
+                    return GetColumnsFromTableByName(table, FKColumnNames);
                 else
                     return null;
             }
@@ -119,12 +121,16 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
         {
             get
             {
-                if (PKColumn.IsPrimaryKey)
+                IColumn pkColumn = PKColumns.First();
-                    return Cardinality.Many;
+
-                else if (!PKColumn.IsPrimaryKey && !FKColumn.IsNullable)
+                if (!pkColumn.IsPrimaryKey && !FKColumns.First().IsNullable)
                     return Cardinality.One;
-                else // !PKColumn.IsPrimaryKey && FKColumn.IsNullable
+                if (pkColumn.IsPrimaryKey && pkColumn.IsForeignKey)
-                    return Cardinality.ZeroToOne;
+                    return Cardinality.One; 
+                if (pkColumn.IsPrimaryKey)
+                    return Cardinality.Many;
+                
+                return Cardinality.ZeroToOne;
             }
         }
 
@@ -149,9 +155,9 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
             return null;
         }
 
-        private IColumn GetColumnFromTableByName(ITable table, string columnName)
+        private DatabaseObjectsCollection<IColumn> GetColumnsFromTableByName(ITable table, List<string> columnNames)
         {     
-            return table.Items.FirstOrDefault(c => c.Name == columnName);
+            return table.Items.Where(c => columnNames.Contains(c.Name)).ToDatabaseObjectsCollection();
         }
 
         #endregion

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/DatabaseObjects/Database.cs

@@ -23,7 +23,6 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
         private DatabaseObjectBase<IView> _views = null;
         private DatabaseObjectBase<IProcedure> _procedures = null;
         private DatabaseObjectBase<IConstraint> _constraints = null;
-        private DatabaseObjectBase<IUserDefinedDataType> _userDefinedDataTypes = null;
 
         #endregion
 
@@ -83,17 +82,6 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
             }
         }
 
-        public DatabaseObjectsCollection<IUserDefinedDataType> UserDefinedDataTypes
-        {
-            get
-            {
-                if (_userDefinedDataTypes != null)
-                    return _userDefinedDataTypes.Items;
-                else
-                    return null;
-            }
-        }
-
         #endregion
 
         #region Constructor
@@ -114,9 +102,6 @@ namespace ICSharpCode.Data.Core.DatabaseObjects
                 _constraints = new DatabaseObjectBase<IConstraint>();
                 _constraints.Name = "Constraints";
 
-                _userDefinedDataTypes = new DatabaseObjectBase<IUserDefinedDataType>();
-                _userDefinedDataTypes.Name = "UserDefinedDataTypes";
-
                 _tables = new DatabaseObjectBase<ITable>();
                 _tables.Name = "Tables";
                 _tables.Items = Datasource.DatabaseDriver.LoadTables(this);

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/ICSharpCode.Data.Core.csproj

@@ -83,7 +83,6 @@
     <Compile Include="Common\Enumerable.cs" />
     <Compile Include="Common\Helper.cs" />
     <Compile Include="DatabaseObjects\TableType.cs" />
-    <Compile Include="DatabaseObjects\UserDefinedDataType.cs" />
     <Compile Include="DatabaseObjects\View.cs" />
     <Compile Include="Enums\Cardinality.cs" />
     <Compile Include="Enums\ParameterMode.cs" />
@@ -98,7 +97,6 @@
     <Compile Include="Interfaces\IProcedure.cs" />
     <Compile Include="Interfaces\IProcedureParameter.cs" />
     <Compile Include="Interfaces\ITable.cs" />
-    <Compile Include="Interfaces\IUserDefinedDataType.cs" />
     <Compile Include="Interfaces\IView.cs" />
     <Compile Include="Common\Objects.cs" />
     <Compile Include="Properties\AssemblyInfo.cs">

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/Interfaces/IColumn.cs

@@ -1,8 +1,12 @@
-using System;
+#region Usings
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
+#endregion
+
 namespace ICSharpCode.Data.Core.Interfaces
 {
     public interface IColumn : IDatabaseObjectBase
@@ -16,6 +20,7 @@ namespace ICSharpCode.Data.Core.Interfaces
         bool IsComputed { get; set; }
         bool IsCursorType { get; set; }
         bool IsDeterministic { get; set; }
+        bool IsForeignKey { get; }
         bool IsFulltextIndexed { get; set; }
         bool IsIdentity { get; set; }
         bool IsIdNotForRepl { get; set; }
@@ -25,6 +30,7 @@ namespace ICSharpCode.Data.Core.Interfaces
         bool IsPrecise { get; set; }
         bool IsPrimaryKey { get; set; }
         bool IsRowGuidCol { get; set; }
+        bool IsUserDefinedDataType { get; }
         bool IsSystemVerified { get; set; }
         bool IsXmlIndexable { get; set; }
         int Precision { get; set; }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/Interfaces/IConstraint.cs

@@ -5,6 +5,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using ICSharpCode.Data.Core.Enums;
+using ICSharpCode.Data.Core.DatabaseObjects;
 
 #endregion
 
@@ -12,13 +13,13 @@ namespace ICSharpCode.Data.Core.Interfaces
 {
     public interface IConstraint : IDatabaseObjectBase
     {
-        string PKColumnName { get; set; }
+        List<string> PKColumnNames { get; set; }
         string PKTableName { get; set; }
-        string FKColumnName { get; set; }
+        List<string> FKColumnNames { get; set; }
         string FKTableName { get; set; }
-        IColumn PKColumn { get; }
+        DatabaseObjectsCollection<IColumn> PKColumns { get; }
         ITable PKTable { get; }
-        IColumn FKColumn { get; }
+        DatabaseObjectsCollection<IColumn> FKColumns { get; }
         ITable FKTable { get; }
         Cardinality PKCardinality { get; }
         Cardinality FKCardinality { get; }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.Core/Interfaces/IDatabase.cs

@@ -19,7 +19,6 @@ namespace ICSharpCode.Data.Core.Interfaces
         DatabaseObjectsCollection<IView> Views { get; }
         DatabaseObjectsCollection<IProcedure> Procedures { get; }
         DatabaseObjectsCollection<IConstraint> Constraints { get; }
-        DatabaseObjectsCollection<IUserDefinedDataType> UserDefinedDataTypes { get; }
 
         bool LoadDatabase();
     }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core.UI/DisplayBinding/EDMDesignerViewContent.cs

@@ -107,6 +107,8 @@ namespace ICSharpCode.Data.EDMDesigner.Core.UI.DisplayBinding
 
                 if (wizard.DialogResult == true)
                     _edmView = new EDMView(wizard.EDMXDocument, readMoreAction);
+                else
+                    return;
             }
 
             // Load or generate DesignerView and EntityTypeDesigners

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core/EDMObjects/Common/EventedObservableCollection.cs

@@ -3,6 +3,7 @@
 using System;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
+using System.Collections.Generic;
 
 #endregion
 
@@ -52,4 +53,21 @@ namespace ICSharpCode.Data.EDMDesigner.Core.EDMObjects.Common
 
         #endregion
     }
+
+    public static class EventedObservableCollection
+    {
+        #region Extension methods
+
+        public static EventedObservableCollection<T> ToEventedObservableCollection<T>(this IEnumerable<T> source)
+        {
+            EventedObservableCollection<T> dest = new EventedObservableCollection<T>();
+
+            foreach (T item in source)
+                dest.Add(item);
+
+            return dest;
+        }
+
+        #endregion
+    }
 }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core/EDMObjects/SSDL/Association/Role.cs

@@ -15,6 +15,11 @@ namespace ICSharpCode.Data.EDMDesigner.Core.EDMObjects.SSDL.Association
     {
         public EntityType.EntityType Type { get; set; }
         public Cardinality Cardinality { get; set; }
-        public Property.Property Property { get; set; }
+        public EventedObservableCollection<Property.Property> Properties { get; set; }
+
+        public Role()
+        {
+            Properties = new EventedObservableCollection<Property.Property>();
+        }
     }
 }

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core/IO/SSDLIO.cs

@@ -123,17 +123,22 @@ namespace ICSharpCode.Data.EDMDesigner.Core.IO
                         new XElement(ssdlNamespace + "End", new XAttribute("Role", association.Role1.Name), new XAttribute("Type", string.Concat(entityContainerNamespace, association.Role1.Type.Name)), new XAttribute("Multiplicity", CardinalityStringConverter.CardinalityToSTring(association.Role1.Cardinality))),
                         new XElement(ssdlNamespace + "End", new XAttribute("Role", role2Name), new XAttribute("Type", string.Concat(entityContainerNamespace, association.Role2.Type.Name)), new XAttribute("Multiplicity", CardinalityStringConverter.CardinalityToSTring(association.Role2.Cardinality))));
 
-                string dependantRoleName = association.DependantRole.Name;
+                string dependentRoleName = association.DependantRole.Name;
 
                 // If the assocation end properties are the same properties
                 if (association.PrincipalRole.Name == association.DependantRole.Name && association.PrincipalRole.Type.Name == association.DependantRole.Type.Name)
-                    dependantRoleName += "1";
+                    dependentRoleName += "1";
 
-                associationElement.Add(new XElement(ssdlNamespace + "ReferentialConstraint",
+                XElement principalRoleElement = new XElement(ssdlNamespace + "Principal", new XAttribute("Role", association.PrincipalRole.Name));
-                    new XElement(ssdlNamespace + "Principal", new XAttribute("Role", association.PrincipalRole.Name),
+                foreach (Property property in association.PrincipalRole.Properties)
-                        new XElement(ssdlNamespace + "PropertyRef", new XAttribute("Name", association.PrincipalRole.Property.Name))),
+                    principalRoleElement.Add(new XElement(ssdlNamespace + "PropertyRef", new XAttribute("Name", property.Name)));
-                    new XElement(ssdlNamespace + "Dependent", new XAttribute("Role", dependantRoleName),
+
-                        new XElement(ssdlNamespace + "PropertyRef", new XAttribute("Name", association.DependantRole.Property.Name)))));
+                XElement dependentRoleElement = new XElement(ssdlNamespace + "Dependent", new XAttribute("Role", dependentRoleName));
+                foreach (Property property in association.DependantRole.Properties)
+                    dependentRoleElement.Add(new XElement(ssdlNamespace + "PropertyRef", new XAttribute("Name", property.Name)));
+
+                XElement referentialConstraintElement = new XElement(ssdlNamespace + "ReferentialConstraint", principalRoleElement, dependentRoleElement);
+                associationElement.Add(referentialConstraintElement);
 
                 schema.Add(associationElement);
             }
@@ -250,13 +255,13 @@ namespace ICSharpCode.Data.EDMDesigner.Core.IO
                         {
                             isPrincipal = true;
                             association.PrincipalRole = role;
-                            role.Property = role.Type.Properties.Where(p => p.Name == principalElement.Element(XName.Get("PropertyRef", ssdlNamespace.NamespaceName)).Attribute("Name").Value).First();
+                            role.Properties = role.Type.Properties.Where(p => p.Name == principalElement.Element(XName.Get("PropertyRef", ssdlNamespace.NamespaceName)).Attribute("Name").Value).ToEventedObservableCollection();
                         }
                         else
                         {
                             isPrincipal = false;
                             association.DependantRole = role;
-                            role.Property = role.Type.Properties.Where(p => p.Name == referentialConstraintElement.Element(XName.Get("Dependent", ssdlNamespace.NamespaceName)).Element(XName.Get("PropertyRef", ssdlNamespace.NamespaceName)).Attribute("Name").Value).First();
+                            role.Properties = role.Type.Properties.Where(p => p.Name == referentialConstraintElement.Element(XName.Get("Dependent", ssdlNamespace.NamespaceName)).Element(XName.Get("PropertyRef", ssdlNamespace.NamespaceName)).Attribute("Name").Value).ToEventedObservableCollection();
                         }
                     }
                     if (isPrincipal)

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core/ObjectModelConverters/EDMConverter.cs

@@ -56,15 +56,16 @@ namespace ICSharpCode.Data.EDMDesigner.Core.ObjectModelConverters
                 filenameRump, objectContextName, objectContextNamespace);
             processStartInfo.UseShellExecute = false;
             processStartInfo.ErrorDialog = false;
+            processStartInfo.RedirectStandardOutput = true;
             processStartInfo.RedirectStandardError = true;
             process.StartInfo = processStartInfo;
             process.Start();
+            string outputMessage = process.StandardOutput.ReadToEnd();
             process.WaitForExit();
             
             if (process.ExitCode != 0)
             {
-            	TextReader textReader = process.StandardError;
+            	throw new Exception("An error occured during generating the EDMX file.", new Exception(outputMessage));
-            	throw new Exception("An error occured during generating the EDMX file.", new Exception(textReader.ReadToEnd()));
             }
 
             XDocument csdlXDocument = XDocument.Load(filenameRump + ".csdl");

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.EDMDesigner.Core/ObjectModelConverters/SSDLConverter.cs

@@ -127,15 +127,19 @@ namespace ICSharpCode.Data.EDMDesigner.Core.ObjectModelConverters
             Property property = new Property(entityType)
             {
                 Name = column.Name,
-                Type = column.DataType,
                 IsKey = column.IsPrimaryKey,
-                Nullable = column.IsNullable,
+                Nullable = column.IsNullable
                 // FixedLength
                 // Collation
                 // DefaultValue
                 // Unicode
             };
 
+            if (!column.IsUserDefinedDataType)
+                property.Type = column.DataType;
+            else
+                property.Type = column.SystemType;
+
             if (column.Length > 0)
                 property.MaxLength = column.Length;
 
@@ -167,9 +171,12 @@ namespace ICSharpCode.Data.EDMDesigner.Core.ObjectModelConverters
                 Cardinality = (Cardinality)constraint.PKCardinality
             };
 
-            Property role1Property = CreateSSDLProperty(constraint.PKColumn, CreateSSDLEntityType(constraint.PKTable));
+            foreach (IColumn pkColumn in constraint.PKColumns)
-            role1.Property = role1Property;
+            {
-            role1.Type = role1Property.EntityType;
+                Property role1Property = CreateSSDLProperty(pkColumn, CreateSSDLEntityType(constraint.PKTable));
+                role1.Properties.Add(role1Property);
+                role1.Type = role1Property.EntityType;
+            }
 
             association.Role1 = role1;
             association.PrincipalRole = role1;
@@ -180,9 +187,12 @@ namespace ICSharpCode.Data.EDMDesigner.Core.ObjectModelConverters
                 Cardinality = (Cardinality)constraint.FKCardinality
             };
 
-            Property role2Property = CreateSSDLProperty(constraint.FKColumn, CreateSSDLEntityType(constraint.FKTable));
+            foreach (IColumn fkColumn in constraint.FKColumns)
-            role2.Property = role2Property;
+            {
-            role2.Type = role2Property.EntityType;
+                Property role2Property = CreateSSDLProperty(fkColumn, CreateSSDLEntityType(constraint.FKTable));
+                role2.Properties.Add(role2Property);
+                role2.Type = role2Property.EntityType;
+            }
 
             association.Role2 = role2;
             association.DependantRole = role2;

src/AddIns/DisplayBindings/Data/ICSharpCode.Data.SQLServer/SQLServerDatabaseDriver.cs

@@ -107,7 +107,6 @@ namespace ICSharpCode.Data.Core.DatabaseDrivers.SQLServer
             ORDER BY 
                 1,2,3,4";
 
-        private const string _getUserDefinedDataTypes = @"SELECT t1.*, t2.Name AS SystemType FROM sys.Types t1, sys.types t2 WHERE t1.is_user_defined = 1 AND t2.system_type_id = t1.system_type_id AND t2.user_type_id = t1.system_type_id";
         private const string _getViews = @"SELECT TABLE_SCHEMA, TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='VIEW' AND TABLE_NAME<>'dtproperties' ORDER BY TABLE_SCHEMA, TABLE_NAME";
         private const string _getProcedures = "SELECT ROUTINE_NAME, ROUTINE_SCHEMA, ROUTINE_BODY, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH FROM INFORMATION_SCHEMA.ROUTINES WHERE ROUTINE_TYPE = 'PROCEDURE'";
         private const string _getProcedureParameters = @"SELECT PARAMETER_NAME, DATA_TYPE, CHARACTER_MAXIMUM_LENGTH, PARAMETER_MODE, IS_RESULT FROM information_schema.PARAMETERS WHERE SPECIFIC_NAME = '{0}' AND SPECIFIC_SCHEMA = '{1}' AND SPECIFIC_CATALOG = '{2}'";
@@ -228,6 +227,7 @@ namespace ICSharpCode.Data.Core.DatabaseDrivers.SQLServer
                     column.ColumnId = (int)dtColumns.Rows[j]["ColumnId"];
                     column.Name = (string)dtColumns.Rows[j]["Name"];
                     column.DataType = (string)dtColumns.Rows[j]["DataType"];
+                    column.SystemType = (string)dtColumns.Rows[j]["SystemType"];
                     column.Length = Convert.ToInt32(dtColumns.Rows[j]["Length"]);
 
                     if (column.Length == -1)
@@ -241,6 +241,16 @@ namespace ICSharpCode.Data.Core.DatabaseDrivers.SQLServer
                             default:
                                 break;
                         }
+
+                        switch (column.SystemType.ToLower())
+                        {
+                            case "varchar":
+                            case "nvarchar":
+                                column.SystemType += "(max)";
+                                break;
+                            default:
+                                break;
+                        }
                     }
 
                     column.Precision = Convert.ToInt32(dtColumns.Rows[j]["NumericPrecision"]);
@@ -267,33 +277,23 @@ namespace ICSharpCode.Data.Core.DatabaseDrivers.SQLServer
 
                 for (int i = 0; i < dtConstraints.Rows.Count; i++)
                 {
-                    IConstraint constraint = new ICSharpCode.Data.Core.DatabaseObjects.Constraint();
+                    string constraintName = (string)dtConstraints.Rows[i]["ConstraintName"];
-                    constraint.Name = (string)dtConstraints.Rows[i]["ConstraintName"];
-                    constraint.FKTableName = (string)dtConstraints.Rows[i]["FKTable"];
-                    constraint.FKColumnName = (string)dtConstraints.Rows[i]["FKColumn"];
-                    constraint.PKTableName = (string)dtConstraints.Rows[i]["PKTable"];
-                    constraint.PKColumnName = (string)dtConstraints.Rows[i]["PKColumn"];
-
-                    database.Constraints.Add(constraint);
-                }
-            }
 
-            using (SqlDataAdapter da = new SqlDataAdapter(_getUserDefinedDataTypes, sqlConnection))
+                    IConstraint constraint = database.Constraints.FirstOrDefault(c => c.Name == constraintName);
-            {
-                DataTable dtUserDefinedDataTypes = new DataTable("UserDefinedDataTypes");
-                da.Fill(dtUserDefinedDataTypes);
 
-                for (int i = 0; i < dtUserDefinedDataTypes.Rows.Count; i++)
+                    if (constraint == null)
-                {
+                    {
-                    IUserDefinedDataType userDefinedDataType = new UserDefinedDataType();
+                        constraint = new ICSharpCode.Data.Core.DatabaseObjects.Constraint();
-                    userDefinedDataType.Name = (string)dtUserDefinedDataTypes.Rows[i]["Name"];
+                        constraint.Name = constraintName;
-                    userDefinedDataType.SystemType = (string)dtUserDefinedDataTypes.Rows[i]["SystemType"];
+                        constraint.FKTableName = (string)dtConstraints.Rows[i]["FKTable"];
-                    userDefinedDataType.Length = Convert.ToInt32(dtUserDefinedDataTypes.Rows[i]["Max_Length"]);
+                        constraint.PKTableName = (string)dtConstraints.Rows[i]["PKTable"];
-                    userDefinedDataType.IsNullable = (bool)dtUserDefinedDataTypes.Rows[i]["Is_Nullable"];
 
-                    database.UserDefinedDataTypes.Add(userDefinedDataType);
+                        database.Constraints.Add(constraint);
-                }
+                    }
 
+                    constraint.FKColumnNames.Add((string)dtConstraints.Rows[i]["FKColumn"]);
+                    constraint.PKColumnNames.Add((string)dtConstraints.Rows[i]["PKColumn"]);                
+                }
             }
 
             using (SqlDataAdapter da = new SqlDataAdapter(_getTables, sqlConnection))