Added DbIntermediateForeignObject and resolver

Set version to 1.5.20

Database-Attribute_System/Attributes/DbIntermediateForeignObject.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
+{
+    [AttributeUsage(AttributeTargets.Field, Inherited = false, AllowMultiple = false)]
+    public class DbIntermediateForeignObject : Attribute
+    {
+        public Type foreignObjectType;
+
+        public string _intermediateTableName;
+
+        public string _keyName;
+        public string _foreignKeyName;
+
+
+        public DbPrimaryKey foreignPrimaryKeyAttribute;
+
+        public FieldInfo parentField;
+        public DbObject classAttribute;
+
+        /// <summary>
+        /// Marks variable as intermediate-object of an dbObject
+        /// </summary>
+        /// <param name="intermediateTableName">Table-name of intermediate-table. Must contain primaryKey of this class & target class</param>
+        /// <param name="keyName">Fieldname of primaryKey associated with the IntermediateObject on this side [m]:n (null if same as primary key) [Only works with 1 primaryKey]</param>
+        /// <param name="foreignKeyName">Fieldname of primaryKey associated with the IntermediateObject on the other side m:[n] (null if same as primary key) [Only works with 1 primaryKey]</param>
+        public DbIntermediateForeignObject(string intermediateTableName, string keyName = null, string foreignKeyName = null)
+        {
+            this._intermediateTableName = intermediateTableName;
+            this._foreignKeyName = foreignKeyName;
+        }
+
+        public void Init(FieldInfo fi, DbObject classAttribute)
+        {
+            this.parentField = fi;
+            this.classAttribute = classAttribute;
+            this.foreignObjectType = fi.FieldType;
+
+            // Init foreign-object class
+            DbObject foreignClassAttribute = ClassAction.Init(this.foreignObjectType);
+
+            if (classAttribute.primaryKeyAttributes.Count < 1) throw new InvalidOperationException($"'{classAttribute.parentClassType.Name}' does not have a primaryKey.");
+            if (classAttribute.primaryKeyAttributes.Count > 1) throw new InvalidOperationException($"IntermediateObject does not support multiple primaryKeys.");
+            // Get primaryKey name if none is set
+            if (_keyName == null) _keyName = classAttribute.primaryKeyAttributes[0]._attributeName;
+
+            if (!(fi.FieldType is IList && fi.FieldType.IsGenericType))  // 1:m
+                throw new InvalidOperationException($"IntermediateObject has to be typeof(List<T>). Maybe you meant to use DbForeignObject or DbReverseForeignObject for 1:m or 1:1 relations.");
+
+            // Check the generic list and get inner-type
+            Type foreignObjectType = null;
+            foreach (Type interfaceType in fi.FieldType.GetInterfaces())
+            {
+                if (interfaceType.IsGenericType &&
+                    interfaceType.GetGenericTypeDefinition()
+                    == typeof(IList<>))
+                {
+                    foreignObjectType = fi.FieldType.GetGenericArguments()[0];
+                    break;
+                }
+            }
+            if (foreignObjectType == null) throw new InvalidOperationException("Could not read innter-type of generic-list!");
+
+            // Now get the primaryKey from my foreignObject
+            DbObject foreignDbObject = ClassAction.Init(foreignObjectType);
+            // Check the primaryKey/s
+            if (foreignDbObject.primaryKeyAttributes.Count < 1) throw new InvalidOperationException($"'{foreignDbObject.parentClassType.Name}' does not have a primaryKey.");
+            if (foreignDbObject.primaryKeyAttributes.Count > 1) throw new InvalidOperationException($"IntermediateObject does not support multiple primaryKeys. (Found '{foreignDbObject.primaryKeyAttributes.Count}' in '{foreignDbObject.parentClassType.Name}')");
+            // Save it
+            foreignPrimaryKeyAttribute = foreignDbObject.primaryKeyAttributes[0];
+
+            if (_foreignKeyName == null) _foreignKeyName = foreignPrimaryKeyAttribute._attributeName;
+        }
+    }
+}

Database-Attribute_System/Attributes/DbObject.cs

@@ -20,6 +20,8 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
         public List<DbAttribute> attributeAttributes = new List<DbAttribute>() { };
         public List<DbForeignKey> foreignKeyAttributes = new List<DbForeignKey>() { };
         public List<DbForeignObject> foreignObjectAttributes = new List<DbForeignObject>() { };
+        public List<DbReverseForeignObject> reverseForeignObjectAttributes = new List<DbReverseForeignObject>() { };
+        public List<DbIntermediateForeignObject> intermediateObjectAttributes = new List<DbIntermediateForeignObject>() { };
 
         /// <summary>
         /// Marks variable as database-table
@@ -68,6 +70,16 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
 
                         this.foreignObjectAttributes.Add(fobj);
                     }
+                    else if (fi.GetCustomAttribute(typeof(DbReverseForeignObject), true) is DbReverseForeignObject rfobj)    // ReverseForeignObjects
+                    {
+                        rfobj.Init(fi, this);
+                        this.reverseForeignObjectAttributes.Add(rfobj);
+                    }
+                    else if (fi.GetCustomAttribute(typeof(DbIntermediateForeignObject), true) is DbIntermediateForeignObject iobj)    // ReverseForeignObjects
+                    {
+                        iobj.Init(fi, this);
+                        this.intermediateObjectAttributes.Add(iobj);
+                    }
                 }
                 catch(InvalidOperationException ex)
                 {

Database-Attribute_System/Attributes/DbReverseForeignObject.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Reflection;
+using System.Threading.Tasks;
+
+namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
+{
+    [AttributeUsage(AttributeTargets.Field, Inherited = false, AllowMultiple = false)]
+    public class DbReverseForeignObject : Attribute
+    {
+        public Type foreignObjectType;
+
+        public string _foreignKeyName;
+        public DbForeignKey foreignKeyAttribute;
+
+        public FieldInfo parentField;
+        public DbObject classAttribute;
+
+        /// <summary>
+        /// Marks variable as reverse-foreign-object of an dbObject
+        /// </summary>
+        /// <param name="foreignKeyName">Fieldname of primaryKey associated with the reverseForeignObject (null if same as primary key) [Only works with 1 primaryKey]</param>
+        public DbReverseForeignObject(string foreignKeyName = null)
+        {
+            this._foreignKeyName = foreignKeyName;
+        }
+
+        public void Init(FieldInfo fi, DbObject classAttribute)
+        {
+            this.parentField = fi;
+            this.classAttribute = classAttribute;
+            this.foreignObjectType = fi.FieldType;
+
+            // Init foreign-object class
+            DbObject foreignClassAttribute = ClassAction.Init(this.foreignObjectType);
+
+            if (classAttribute.primaryKeyAttributes.Count < 1) throw new InvalidOperationException($"'{classAttribute.parentClassType.Name}' does not have a primaryKey.");
+            if (classAttribute.primaryKeyAttributes.Count > 1) throw new InvalidOperationException($"ReverseForeignObject does not support multiple primaryKeys.");
+            // Get primaryKey name if none is set
+            if (_foreignKeyName == null) _foreignKeyName = classAttribute.primaryKeyAttributes[0]._attributeName;
+
+            // Check if my primary-key is set in the foreign-class as foreignKey
+            DbPrimaryKey primaryKey = classAttribute.primaryKeyAttributes[0];
+            foreach (DbForeignKey foreignKey in foreignClassAttribute.foreignKeyAttributes)
+            {
+                if (primaryKey._attributeName.ToLower() == foreignKey._attributeName.ToLower())  // Name matches
+                    if (primaryKey.parentField.GetType() == foreignKey.parentField.GetType())   // Type matches
+                    {
+                        foreignKeyAttribute = foreignKey;
+                    }
+                    else
+                        // Same name, but wrong type
+                        throw new InvalidOperationException($"ForeignObject='{foreignClassAttribute.parentClassType.Name}' has invalid type foreignKey='{foreignKey.parentField.Name}' for object='{classAttribute.parentClassType.Name}' with primaryKey='{primaryKey.parentField.Name}'.");
+            }
+            // No match
+            if (foreignKeyAttribute == null) throw new InvalidOperationException($"ForeignObject='{foreignClassAttribute.parentClassType.Name}' is missing foreignKey for object='{classAttribute.parentClassType.Name}' with primaryKey='{primaryKey.parentField.Name}'.");
+        }
+    }
+}

Database-Attribute_System/ClassAction.cs

@@ -1,5 +1,6 @@
 using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
 using System;
+using System.Collections;
 using System.Collections.Generic;
 using System.Reflection;
 using System.Text;
@@ -126,7 +127,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
                 }
 
                 // If no data was found matching this field
-                if (!dataMatchFound) throw new InvalidOperationException($"Cannot create object with primaryKeyData. No data assigned to field '{primaryKeyAtt.parentField.Name}'");
+                if (!dataMatchFound) throw new InvalidOperationException($"PrimaryKey='{primaryKeyAtt.parentField.Name}' is missing.");
             }
 
             ResolveByPrimaryKey<T>(obj, queryExecutor);
@@ -162,7 +163,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
         }
 
         /// <summary>
-        /// Gets an dbObject by primaryKey/s
+        /// Gets an dbObject by custom where-clause
         /// </summary>
         /// <typeparam name="T"></typeparam>
         /// <param name="classObject">Given object (marked with Db-attributes)</param>
@@ -186,7 +187,34 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
 
             return objs;    // Return list
         }
-        
+
+        /// <summary>
+        /// Gets an dbObject by full query
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="classObject">Given object (marked with Db-attributes)</param>
+        /// <param name="customQuery">Custom sql-query</param>
+        /// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
+        public static List<T> GetListWithQuery<T>(Type classType, Func<string, List<Dictionary<string, object>>> queryExecutor, params object[] customQuery) where T : new()
+        {
+            // Read dbObject - attribute
+            DbObject dbObject = ClassAction.Init(classType);
+
+            string query = QueryBuilder.BuildQuery(customQuery);
+            List<Dictionary<string, object>> dataSet = queryExecutor(query);    // Execute
+
+            List<T> objs = new List<T>() { };
+            foreach (Dictionary<string, object> data in dataSet)
+            {
+                T obj = new T();    // New object
+                FillObject(obj, data);   // Fill it
+                objs.Add(obj);      // Add to list
+            }
+
+            return objs;    // Return list
+        }
+
+
         /// <summary>
         /// Gets a list of dbObjects by attribute/s
         /// </summary>
@@ -194,7 +222,6 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
         /// <param name="classType">Type of class</param>
         /// <param name="fields">class-fields for select</param>
         /// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
-        /// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
         /// <returns>List of dbObjects</returns>
         public static List<T> GetListByAttribute<T>(Type classType, Dictionary<string, object> fields, Func<string, List<Dictionary<string, object>>> queryExecutor) where T : new()
         {
@@ -230,6 +257,8 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
         {
             string query = QueryBuilder.SelectByPrimaryKey(classObject);   // Generate query
             List<Dictionary<string, object>> dataSet = queryExecutor(query);    // Execute
+
+            if (dataSet.Count == 0) throw new InvalidOperationException($"Cannot fetch '{typeof(T).Name}' by primary key/s. No results!");
             FillObject(classObject, dataSet[0]);   // Fill the object
         }
 
@@ -241,7 +270,6 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
         /// <param name="classObject">Given object (marked with Db-attributes)</param>
         /// <param name="queryExecutor">Function to handle query-calls - Has to return Dictionary[attributeName, attributeValue]</param>
         /// <param name="max_depth">Determents how deep resolving will be executed</param>
-        /// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
         public static void ResolveForeignKeys<T>(T classObject, Func<string, List<Dictionary<string, object>>> queryExecutor, int max_depth = 1) where T: new()
         {
             Type classType = classObject.GetType();
@@ -249,22 +277,170 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             // Read dbObject-attribute
             DbObject dbObject = ClassAction.Init(classType);
 
+            // Resolve foreignObjects
             foreach (DbForeignObject foreignObjectAtt in dbObject.foreignObjectAttributes)
             {
                 object foreignObject_value = foreignObjectAtt.parentField.GetValue(classObject);
 
-                // When its empty, get it
+                // When its empty, get it & set it
                 if(foreignObject_value == null)
                 {
+                    // Resolve it
                     foreignObject_value = GetByPrimaryKey<T>(classType, foreignObjectAtt.foreignKeyAttribute.parentField.GetValue(classObject), queryExecutor);
+                    foreignObjectAtt.parentField.SetValue(classObject, foreignObject_value);    // Set the value
+
+                    // Now scan the just resolved class to be able to set myself
+                    DbObject foreignDbObject = Init(foreignObject_value.GetType());
+                    foreach(DbReverseForeignObject dbReverseForeignObject in foreignDbObject.reverseForeignObjectAttributes)
+                    {
+                        // If the field-names match
+                        if(dbReverseForeignObject._foreignKeyName.ToLower() == dbObject.primaryKeyAttributes[0]._attributeName.ToLower())
+                        {
+                            object myReference;
+                            if (dbReverseForeignObject.parentField.FieldType is IList && dbReverseForeignObject.parentField.FieldType.IsGenericType)  // 1:m
+                            {
+                                // If its a list, i create a list with just myself
+                                myReference = new List<T>() { classObject };
+                            }
+                            else    // 1:1
+                            {
+                                // Otherwise ist just myself
+                                myReference = classObject;
+                            }
+                            dbReverseForeignObject.parentField.SetValue(foreignObject_value, myReference);
+                            break;
+                        }
+                    }
                 }
 
                 // Recursive resolving
-                if (max_depth - 1 > 0)
+                if (max_depth > 1)
                 {
+                    // Go recursively into the next class
                     ResolveForeignKeys(foreignObject_value, queryExecutor, max_depth - 1);
                 }
             }
+
+            // Resolve intermediateForeignObjects
+            foreach (DbIntermediateForeignObject intermediateForeignObjectAtt in dbObject.intermediateObjectAttributes)
+            {
+                object intermediateForeignObject_value = intermediateForeignObjectAtt.parentField.GetValue(classObject);
+
+                // When its empty, get it & set it
+                if (intermediateForeignObject_value == null)
+                {
+                    // Generate & set attribute-set
+                    Dictionary<string, object> attributes = new Dictionary<string, object>();
+                    attributes.Add(intermediateForeignObjectAtt._keyName, dbObject.primaryKeyAttributes[0].parentField.GetValue(classObject));
+
+                    string query = QueryBuilder.SelectByAttribute(intermediateForeignObjectAtt._intermediateTableName, attributes);   // Generate query
+                    List<Dictionary<string, object>> dataSet = queryExecutor(query);    // Execute
+                    // Extract data
+                    List<object> values = new List<object>();
+                    for (int i=0; i<dataSet.Count; i++)
+                    {
+                        Dictionary<string, object> data = dataSet[i];
+                        object primaryKeyValue = data[intermediateForeignObjectAtt.foreignPrimaryKeyAttribute._attributeName];
+
+                        values.Add(GetByPrimaryKey<object>(intermediateForeignObjectAtt.foreignPrimaryKeyAttribute.classAttribute.parentClassType, primaryKeyValue, queryExecutor));
+                    }
+
+                    // Now scan the just resolved class to be able to set myself
+                    DbObject foreignDbObject = Init(intermediateForeignObjectAtt.foreignPrimaryKeyAttribute.classAttribute.parentClassType);
+                    foreach (DbForeignObject dbForeignObject in foreignDbObject.foreignObjectAttributes)
+                    {
+                        // If the field-names match
+                        if (dbForeignObject._foreignKeyName.ToLower() == dbObject.primaryKeyAttributes[0]._attributeName.ToLower())
+                        {
+                            object myReference = classObject;
+                            foreach (object value in values)
+                            {
+                                dbForeignObject.parentField.SetValue(value, myReference);
+                            }
+                            break;
+                        }
+                    }
+
+                    // Set value
+                    intermediateForeignObject_value = values;
+                    intermediateForeignObjectAtt.parentField.SetValue(classObject, intermediateForeignObject_value);
+                }
+
+                // Recursive resolving
+                if (max_depth > 1)
+                {
+                    // If we have a list of objects, we need to recursively go into each one
+                    foreach (object value in (IList)intermediateForeignObject_value)
+                    {
+                        ResolveForeignKeys(value, queryExecutor, max_depth - 1);
+                    }
+                }
+            }
+
+            // Resolve reverseForeignObjects
+            foreach (DbReverseForeignObject reverseForeignObjectAtt in dbObject.reverseForeignObjectAttributes)
+            {
+                object reverseForeignObject_value = reverseForeignObjectAtt.parentField.GetValue(classObject);
+                Type reverseForeignObject_type = reverseForeignObjectAtt.parentField.GetType();
+
+                // When its empty, get it & set it
+                if (reverseForeignObject_value == null)
+                {
+                    // Generate & set attribute-set
+                    Dictionary<string, object> attributes = new Dictionary<string, object>();
+                    attributes.Add(reverseForeignObjectAtt._foreignKeyName, dbObject.primaryKeyAttributes[0].parentField.GetValue(classObject));
+
+                    List<object> values = GetListByAttribute<object>(reverseForeignObjectAtt.foreignKeyAttribute.classAttribute.parentClassType, attributes, queryExecutor);
+
+                    if(values.Count == 0) throw new InvalidOperationException($"'{reverseForeignObjectAtt.parentField.Name}' could not been resolved. ReverseForeignObject returned '{values.Count}' values.");
+
+                    // Now scan the just resolved class to be able to set myself
+                    DbObject foreignDbObject = Init(reverseForeignObjectAtt.foreignKeyAttribute.classAttribute.parentClassType);
+                    foreach (DbForeignObject dbForeignObject in foreignDbObject.foreignObjectAttributes)
+                    {
+                        // If the field-names match
+                        if (dbForeignObject._foreignKeyName.ToLower() == dbObject.primaryKeyAttributes[0]._attributeName.ToLower())
+                        {
+                            object myReference = classObject;
+                            foreach(object value in values)
+                            {
+                                dbForeignObject.parentField.SetValue(value, myReference);
+                            }
+                            break;
+                        }
+                    }
+
+                    // Check for type to determen 1:1 or 1:m
+                    if (reverseForeignObject_type is IList && reverseForeignObject_type.IsGenericType)  // List, so 1:m
+                    {
+                        reverseForeignObject_value = values;
+                    }
+                    else    // Not list, so 1:1
+                    {
+                        if (values.Count > 1) throw new InvalidOperationException($"'{reverseForeignObjectAtt.parentField.Name}' could not been resolved as ReverseForeignObject returned '{values.Count}' values. (Is it 1:m instead of 1:1?)");
+                        reverseForeignObject_value = values[0];
+                    }
+                    reverseForeignObjectAtt.parentField.SetValue(classObject, reverseForeignObject_value);
+                }
+
+                // Recursive resolving
+                if (max_depth > 1)
+                {
+                    if (reverseForeignObject_value is IList && reverseForeignObject_type.IsGenericType)  // 1:m
+                    {
+                        // If we have a list of objects, we need to recursively go into each one
+                        foreach(object value in (IList)reverseForeignObject_value)
+                        {
+                            ResolveForeignKeys(value, queryExecutor, max_depth - 1);
+                        }
+                    }
+                    else    // 1:1
+                    {
+                        // Go recursively into the next class
+                        ResolveForeignKeys(reverseForeignObject_value, queryExecutor, max_depth - 1);
+                    } 
+                }
+            }
         }
     }
 }

Database-Attribute_System/Database-Attribute_System.csproj

@@ -4,7 +4,7 @@
     <TargetFramework>netcoreapp2.1</TargetFramework>
     <RootNamespace>eu.railduction.netcore.dll.Database_Attribute_System</RootNamespace>
     <SignAssembly>false</SignAssembly>
-    <Version>1.5.13</Version>
+    <Version>1.5.20</Version>
   </PropertyGroup>
 
 </Project>

Database-Attribute_System/internal/Function.cs

@@ -14,11 +14,6 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             return str_cpy;
         }
 
-        public static string SqlSerialise(DateTime dt, string format = "yyyy-MM-dd HH:mm:ss")
-        {
-            return dt.ToString(format);
-        }
-
         // Recursive object[] copying
         internal static void RecursiveParameterCopying(ref List<object> paramz, object[] objects)
         {
@@ -124,24 +119,24 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
 
         public static string SqlSerialise(object obj)
         {
-            if (obj == null)            // Handle null
+            if (obj == null || obj is DBNull)            // Handle null
             {
                 return "null";
             }
-            else if (obj.GetType() == typeof(string))       // Handle strings
+            else if (obj is string)       // Handle strings
             {
                 return "'" + SqlEscape((string)obj) + "'";  // wrap in sql-brackets and escape sql, if any
             }
-            else if (obj.GetType() == typeof(byte) || obj.GetType() == typeof(int) || obj.GetType() == typeof(float) || obj.GetType() == typeof(double))  // Handle int, float & double
+            else if (obj is byte || obj is int || obj is float || obj is double)  // Handle int, float & double
             {
                 return obj.ToString().Replace(",", ".");    // just format to string and form comma to sql-comma
             }
-            else if (obj.GetType() == typeof(DateTime))        // Handle DateTime
+            else if (obj is DateTime)        // Handle DateTime
             {
                 DateTime dateTime = (DateTime)obj;
-                return "'" + SqlSerialise(dateTime) + "'";     // wrap in sql-brackets and convert to sql-datetime
+                return "'" + dateTime.ToString("yyyy-MM-dd HH:mm:ss") + "'";     // wrap in sql-brackets and convert to sql-datetime
             }
-            else if (obj.GetType() == typeof(Guid))        // Handle Guid
+            else if (obj is Guid)        // Handle Guid
             {
                 string guid = ((Guid)obj).ToString();  // Get Guid as string
                 return "'" + guid + "'";                 // wrap in sql-brackets