Set version

Added ResolveForeignKeys to ClassActions
Changed ResolveByPrimaryKey to GetByPrimaryKey
Added todo's

Database-Attribute_System/Attributes/DbAttribute.cs

@@ -16,7 +16,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
         /// <param name="dbAttributeName">Name of database-attribute (case-sensitivity is determined from database-attribute-settings) ['null' if the same as field-name]</param>
         public DbAttribute(string attributeName = null)
         {
-            this._attributeName = attributeName;
+            this._attributeName = attributeName;    // Todo: Automatic resolving of name if it is null (?)
         }
     }
 }

Database-Attribute_System/Attributes/DbForeignKey.cs

@@ -1,6 +1,7 @@
 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
@@ -10,16 +11,33 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
     {
         public Type _classType;
         public string _attributeName;
+        public string _foreignKeyFieldName;
+        public FieldInfo _foreignKeyField;
 
         /// <summary>
         /// Marks variable as foreignKey of given class
         /// </summary>
         /// <param name="classType">Type of class to which this is the ForeignKey</param>
         /// <param name="dbAttributeName">Name of database-attribute (case-sensitivity is determined from database-attribute-settings) ['null' if the same as field-name]</param>
-        public DbForeignKey(Type classType, string attributeName = null)
+        /// <param name="foreignKeyFieldName">Name of foreignKey-fieldName ['null' if the same as classType-name]</param>
+        public DbForeignKey(Type classType, string foreignKeyFieldName = null, string attributeName = null)
         {
             this._classType = classType;
-            this._attributeName = attributeName;
+            this._attributeName = attributeName;    // Todo: Automatic resolving of name if it is null (?)
+
+            bool fieldFound = false;
+            foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
+            {
+                if(fi.Name.ToLower() == foreignKeyFieldName.ToLower())
+                {
+                    this._foreignKeyFieldName = fi.Name;
+                    this._foreignKeyField = fi;
+
+                    fieldFound = true;
+                    break;
+                }
+            }
+            if (!fieldFound) throw new InvalidOperationException($"Field with name='{foreignKeyFieldName}' not found in {classType.Name}.");
         }
     }
 }

Database-Attribute_System/Attributes/DbObject.cs

@@ -18,7 +18,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
         /// <param name="tableName">Name of database-table (case-sensitivity is determined from database-table-settings) ['null' if the same as class-name]</param>
         public DbObject(string tableName = null)
         {
-            this._tableName = tableName;
+            this._tableName = tableName;    // Todo: Automatic resolving of name if it is null (?)
         }
     }
 }

Database-Attribute_System/Attributes/DbPrimaryKey.cs

@@ -17,7 +17,7 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System.Attributes
         /// <param name="dbAttributeName">Name of database-attribute (case-sensitivity is determined from database-attribute-settings) ['null' if the same as field-name]</param>
         public DbPrimaryKey(string attributeName = null)
         {
-            this._attributeName = attributeName;
+            this._attributeName = attributeName;    // Todo: Automatic resolving of name if it is null (?)
         }
     }
 }

Database-Attribute_System/ClassAction.cs

@@ -0,0 +1,162 @@
+using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+
+namespace eu.railduction.netcore.dll.Database_Attribute_System
+{
+    public class ClassAction
+    {
+        /// <summary>
+        /// Fills an given dbObject with given data<para/>
+        /// Data-attribute-names and class-fieldNames have to match! (non case-sensitive)
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="classObject">Given object (marked with Db-attributes)</param>
+        /// <param name="data">The data</param>
+        /// <param name="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
+        public static void FillObject<T>(T classObject, Dictionary<string, object> data, bool runDataLossChecks = true)
+        {
+            Type classType = classObject.GetType();
+
+            string tableName = Function.GetDbTableName(classType);
+
+            // Get class-fields
+            Dictionary<string, FieldInfo> dbFields = Function.ReadDbClassFields(classType);
+
+            if (runDataLossChecks)
+            {
+                // Check every data-attribute for match in class-fields
+                foreach (KeyValuePair<string, object> data_keySet in data)
+                {
+                    bool isFound = false;
+                    foreach (KeyValuePair<string, FieldInfo> field_keySet in dbFields)
+                    {
+                        if (field_keySet.Key.ToLower() == data_keySet.Key.ToLower())
+                            isFound = true;
+                    }
+
+                    if (!isFound)
+                        throw new InvalidOperationException($"Could not fill object. Data-Attribute '{data_keySet.Key}' was not found in class!");
+                }
+                // Check every class-field for match in data-attributes
+                foreach (KeyValuePair<string, FieldInfo> field_keySet in dbFields)
+                {
+                    bool isFound = false;
+                    foreach (KeyValuePair<string, object> data_keySet in data)
+                    {
+                        if (field_keySet.Key.ToLower() == data_keySet.Key.ToLower())
+                            isFound = true;
+                    }
+
+                    if (!isFound)
+                        throw new InvalidOperationException($"Could not fill object. Class-field '{field_keySet.Key}' was not found in data!");
+                }
+            }      
+
+            // Iterate through data
+            foreach (KeyValuePair<string, object> data_keySet in data)
+            {
+                // Interate through class-fields
+                foreach (KeyValuePair<string, FieldInfo> field_keySet in dbFields)
+                { 
+                    // If its a match, set the value
+                    if (field_keySet.Key.ToLower() == data_keySet.Key.ToLower())
+                    {
+                        field_keySet.Value.SetValue(classObject, data_keySet.Value);
+                        break;
+                    }
+                }
+            }
+        }
+
+
+        /// <summary>
+        /// Gets an dbObject
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <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="runDataLossChecks">This checks if any class-field and data-attribute does not exists in either (Slower)</param>
+        public static T GetByPrimaryKey<T>(Type classType, Func<string, List<Dictionary<string, object>>> queryExecutor, bool runDataLossChecks = true) where T: new()
+        {
+            T obj = new T();
+
+            string query = QueryBuilder.SelectByPrimaryKey(obj);   // Generate query
+            List<Dictionary<string, object>> dataSet = queryExecutor(query);    // Execute
+            FillObject(obj, dataSet[0], runDataLossChecks);   // Fill the object
+
+            return obj;
+        }
+
+        /// <summary>
+        /// Gets a list of dbObjects by attribute/s
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <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></returns>
+        public static List<T> GetListByAttribute<T>(Type classType, Dictionary<string, object> fields, Func<string, List<Dictionary<string, object>>> queryExecutor, bool runDataLossChecks = true) where T : new()
+        {
+            string tableName = Function.GetDbTableName(classType);  // Get database-tableName
+
+            Function.ConvertAttributeToDbAttributes(classType, fields);
+
+            string query = QueryBuilder.SelectByAttribute(tableName, fields);   // Generate query
+            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, runDataLossChecks);   // Fill it
+                objs.Add(obj);      // Add to list
+            }
+
+            return objs;    // Return list
+        }
+
+
+
+        /// <summary>
+        /// Resolves all foreignKeys with the database
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <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, bool runDataLossChecks = true) where T: new()
+        {
+            Type classType = classObject.GetType();
+
+            // Get class-fields
+            Dictionary<string, FieldInfo> dbFields = Function.ReadDbClassFields(classType);
+
+            foreach (KeyValuePair<string, FieldInfo> dbField in dbFields)
+            {
+                // If field is foreignKey
+                if (dbField.Value.GetCustomAttribute(typeof(DbForeignKey), true) is DbForeignKey fkey)
+                {
+                    FieldInfo f_Field = fkey._foreignKeyField;
+                    object f_value = f_Field.GetValue(classObject);
+
+                    // When its empty, get it
+                    if(f_value == null)
+                    {
+                        f_value = GetByPrimaryKey<T>(classType, queryExecutor, runDataLossChecks); ;
+                    }
+
+                    // Recursive resolving
+                    if (max_depth - 1 > 0)
+                    {
+                        ResolveForeignKeys(f_value, queryExecutor, max_depth - 1, runDataLossChecks);
+                    }
+                }
+            }
+        }
+    }
+}

Database-Attribute_System/Database-Attribute_System.csproj

@@ -4,6 +4,7 @@
     <TargetFramework>netcoreapp2.1</TargetFramework>
     <RootNamespace>eu.railduction.netcore.dll.Database_Attribute_System</RootNamespace>
     <SignAssembly>false</SignAssembly>
+    <Version>1.4</Version>
   </PropertyGroup>
 
 </Project>

Database-Attribute_System/Function.cs

@@ -1,86 +0,0 @@
-using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
-using System;
-using System.Collections.Generic;
-using System.Reflection;
-using System.Text;
-
-namespace eu.railduction.netcore.dll.Database_Attribute_System
-{
-    class Function
-    {
-        public static string SqlEscape(string str)
-        {
-            string str_cpy = str.Replace(@"'", @"\'");
-            return str_cpy;
-        }
-
-        public static string SqlSerialise(DateTime dt)
-        {
-            return dt.ToString("yyyy-MM-dd HH:mm:ss");
-        }
-
-
-        public static object[] BuildKeyEqualQuery(Dictionary<string, object> keysets, string seperator)
-        {
-            object[] param = new object[keysets.Count * 2];
-            int c = 0;
-            foreach (KeyValuePair<string, object> keyset in keysets)
-            {
-                string sql_string = "";
-
-                if (c != 0) sql_string += seperator;
-                sql_string += $"{keyset.Key}=";
-
-                param[c] = sql_string;
-                param[c + 1] = keyset.Value;
-
-                c += 2;
-            }
-
-            return param;
-        }
-
-        public static string GetDbTableName(Type classType)
-        {
-            // Check if class has attribute 'DbObject' and get the database table-name
-            if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException("Cannot generate SQL-Query of class. Missing Attribute 'DbObject'");
-            string tableName = dbObjectAttribute._tableName ?? classType.Name;    // If no alternative table-name is specified, use the class-name
-
-            return tableName;
-        }
-
-        public static void ReadDbClassFields<T>(T classObject, ref Dictionary<string, object> dbPrimaryKeys, ref Dictionary<string, object> dbAttributes, ref Dictionary<string, object> dbForeignKeys)
-        {
-            Type classType = typeof(T);
-
-            // Reset lists (just in case)
-            dbPrimaryKeys = new Dictionary<string, object> () { };
-            dbAttributes = new Dictionary<string, object>() { };
-            dbForeignKeys = new Dictionary<string, object>() { };
-
-            // Iterate thru all properties
-            foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
-            {
-                // Check if current field is a db-field
-                if (fi.GetCustomAttribute(typeof(DbPrimaryKey), true) is DbPrimaryKey pkey) // PrimaryKey
-                {
-                    string dbAttributeName = pkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
-                    object value = fi.GetValue(classObject);
-                    dbPrimaryKeys.Add(dbAttributeName, value);
-                }
-                else if (fi.GetCustomAttribute(typeof(DbAttribute), true) is DbAttribute att)   // Attributes
-                {
-                    string dbAttributeName = att._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
-                    object value = fi.GetValue(classObject);
-                    dbAttributes.Add(dbAttributeName, value);
-                }
-                else if (fi.GetCustomAttribute(typeof(DbForeignKey), true) is DbForeignKey fkey)    // ForeignKeys
-                {
-                    string dbAttributeName = fkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
-                    object value = fi.GetValue(classObject);
-                    dbForeignKeys.Add(dbAttributeName, value);
-                }
-            }
-        }
-    }
-}

Database-Attribute_System/QueryBuilder.cs

@@ -7,7 +7,14 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
 {
     public class QueryBuilder
     {
-        public static string SelectByPrimaryKeys<T>(T classObject)
+        /// <summary>
+        /// Builds an SELECT-Sql-query based on an object
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="classObject">Given object (marked with Db-attributes)</param>
+        /// <param name="tableName">The db-table-name</param>
+        /// <returns>SELECT-Sql-query</returns>
+        public static string SelectByPrimaryKey<T>(T classObject)
         {
             Type classType = classObject.GetType();
 
@@ -19,18 +26,47 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
             Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
             Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
+            if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
 
+            return SelectByAttribute(tableName, dbPrimaryKeys);
+        }
+
+        /// <summary>
+        /// Builds an SELECT-Sql-query based on an object<para/>
+        /// Object needs to have at least 1 attribute!
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="tableName">The db-table-name</param>
+        /// <param name="dbAttributes">The db-attributes with dbAttribute-name and value<para/>If null is given, it will generate a default 'SELECT * FROM tableName'</param>
+        /// <returns>SELECT-Sql-query</returns>
+        public static string SelectByAttribute(string tableName, Dictionary<string, object> dbAttributes = null)
+        {
+            object[] param = new object[1];
+            if (dbAttributes != null)
+            {
                 // Build where statements with primaryKey/s
-            object[] param = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
+                param = DbFunction.BuildKeyEqualQuery(dbAttributes, " AND ");
+            }
+
+            string sqlCmd = $"SELECT * FROM {tableName}";
             // Add SQL-command part
-            param[0] = $"SELECT * FROM {tableName} WHERE "+ param[0];
+            if (dbAttributes != null)
+                param[0] = $"{sqlCmd} WHERE {param[0]}";
+            else
+                param[0] = sqlCmd;
 
             // Build and return the query
             return BuildQuery(param);
         }
 
-
+        /// <summary>
-        public static string UpdateByPrimaryKeys<T>(T classObject)
+        /// Builds an UPDATE-Sql-query based on an object<para/>
+        /// Object needs to have at least 1 primary-key!
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="classObject">Given object (marked with Db-attributes)</param>
+        /// <returns>UPDATE-Sql-query</returns>
+        public static string UpdateByPrimaryKey<T>(T classObject)
         {
             Type classType = classObject.GetType();
 
@@ -42,20 +78,21 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
             Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
             Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
+            if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
 
             // Add foreign-keys to attributes
-            foreach(KeyValuePair<string, object> dbForeignKey in dbForeignKeys)
+            foreach (KeyValuePair<string, object> dbForeignKey in dbForeignKeys)
             {
                 dbAttributes.Add(dbForeignKey.Key, dbForeignKey.Value);
             }
 
             // Build set-parameters
-            object[] paramSet = Function.BuildKeyEqualQuery(dbAttributes, ", ");
+            object[] paramSet = DbFunction.BuildKeyEqualQuery(dbAttributes, ", ");
             // Add SQL-command part
             paramSet[0] = $"UPDATE {tableName} SET "+ paramSet[0];
 
             // Build where-parameters
-            object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
+            object[] paramWhere = DbFunction.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
             // Add SQL-command part
             paramWhere[0] = " WHERE "+ paramWhere[0];
 
@@ -63,7 +100,14 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             return BuildQuery(paramSet, paramWhere);
         }
 
-        public static string DeleteByPrimaryKeys<T>(T classObject)
+        /// <summary>
+        /// Builds an DELETE-Sql-query based on an object<para/>
+        /// Object needs to have at least 1 primary-key!
+        /// </summary>
+        /// <typeparam name="T"></typeparam>
+        /// <param name="classObject">Given object (marked with Db-attributes)</param>
+        /// <returns>DELETE-Sql-query</returns>
+        public static string DeleteByPrimaryKey<T>(T classObject)
         {
             Type classType = classObject.GetType();
 
@@ -75,40 +119,50 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
             Dictionary<string, object> dbAttributes = new Dictionary<string, object>() { };
             Dictionary<string, object> dbForeignKeys = new Dictionary<string, object>() { };
             Function.ReadDbClassFields(classObject, ref dbPrimaryKeys, ref dbAttributes, ref dbForeignKeys);
-
+            if (dbPrimaryKeys.Count == 0) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. No primary-key/s found!");
-            // Build where-parameters
-            object[] paramWhere = Function.BuildKeyEqualQuery(dbPrimaryKeys, " AND ");
-            // Add SQL-command part
-            paramWhere[0] = $"DELETE FROM {tableName} WHERE "+ paramWhere[0];
 
             // Build and return the query
-            return BuildQuery(paramWhere);
+            return DeleteByAttribute(tableName, dbPrimaryKeys);
         }
 
+        public static string DeleteByAttribute(string tableName, Dictionary<string, object> dbAttributes = null)
+        {
+            object[] param = new object[1];
+            if (dbAttributes != null)
+            {
+                // Build where statements with primaryKey/s
+                param = DbFunction.BuildKeyEqualQuery(dbAttributes, " AND ");
+            }
+
+            string sqlCmd = $"DELETE FROM {tableName}";
+            // Add SQL-command part
+            if (dbAttributes != null)
+                param[0] = $"{sqlCmd} WHERE {param[0]}";
+            else
+                param[0] = sqlCmd;
+
+            // Build and return the query
+            return BuildQuery(param);
+        }
+
+       
+
 
 
         /// <summary>
         /// Build an SQL-query<para/>
         /// Will build the query-string based on the <paramref name="param"/>s including serialising and escaping for SQL.<para/>
+        /// (Supported-Types: null, string, byte, int, float, double, DateTime, Guid)
         /// </summary>
         /// <param name="param">Params with alternating query-parts and objects beginning with a query-part
-        /// <para/>Example: "SELECT * FROM table WHERE id=", id, " AND name=", name</param>
+        /// <para/>Example: "SELECT * FROM table WHERE id=", id, " AND name=", name<para/>
+        /// Info: Any object[] will be opened recursively and added as <paramref name="param"/> accordingly!
+        /// </param>
         public static string BuildQuery(params object[] param)
         {
-            // Convert array to list and add object[] to it accordingly
+            // Convert array to list and add object[] to it recursively
             List<object> paramz = new List<object>() { };
-            foreach (object obj in param)
+            Function.RecursiveParameterCopying(ref paramz, (object[])param);
-            {
-                if (!(obj is object[]))
-                    paramz.Add(obj);
-                else
-                {
-                    foreach (object obj2 in (object[])obj)
-                    {
-                        paramz.Add(obj2);
-                    }
-                }
-            }
 
             string query = "";
             for (int i = 0; i < paramz.Count; i++)
@@ -116,33 +170,9 @@ namespace eu.railduction.netcore.dll.Database_Attribute_System
                 if (i % 2 == 0) query += paramz[i];  // Every 'even' count will just add
                 else       // Every 'uneven' count will handle param as passed variable    
                 {
-                    string paramString = "";
+                    string paramString = Function.SqlSerialise(paramz[i]);
-                    if (paramz[i] == null)            // Handle null
+                    if(paramString == null)        // Unknown type in params
-                    {
+                        throw new Exception($"Error in query-builder. Type '{paramz[i].GetType().ToString()}' cannot be serialised!");
-                        paramString = "null";
-                    }
-                    else if (paramz[i].GetType() == typeof(string))       // Handle strings
-                    {
-                        paramString = "'" + Function.SqlEscape((string)paramz[i]) + "'";  // wrap in sql-brackets and escape sql, if any
-                    }
-                    else if (paramz[i].GetType() == typeof(int) || paramz[i].GetType() == typeof(float) || paramz[i].GetType() == typeof(double))  // Handle int, float & double
-                    {
-                        paramString = paramz[i].ToString().Replace(",", ".");    // just format to string and form comma to sql-comma
-                    }
-                    else if (paramz[i].GetType() == typeof(DateTime))        // Handle DateTime
-                    {
-                        DateTime dateTime = (DateTime)paramz[i];
-                        paramString = "'" + Function.SqlSerialise(dateTime) + "'";     // wrap in sql-brackets and convert to sql-datetime
-                    }
-                    else if (paramz[i].GetType() == typeof(Guid))        // Handle DateTime
-                    {
-                        string guid = ((Guid)paramz[i]).ToString();  // Get Guid as string
-                        paramString = "'" + guid + "'";                 // wrap in sql-brackets
-                    }
-                    else        // Unknown type in params
-                    {
-                        throw new Exception($"Error in query-builder: Type '{paramz[i].GetType().ToString()}' cannot be used!");
-                    }
 
                     // Add formed param to query
                     query += paramString;

Database-Attribute_System/internal/DbFunction.cs

@@ -0,0 +1,31 @@
+using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+
+namespace eu.railduction.netcore.dll.Database_Attribute_System
+{
+    class DbFunction
+    {
+        internal static object[] BuildKeyEqualQuery(Dictionary<string, object> keysets, string seperator)
+        {
+            object[] param = new object[keysets.Count * 2];
+            int c = 0;
+            foreach (KeyValuePair<string, object> keyset in keysets)
+            {
+                string sql_string = "";
+
+                if (c != 0) sql_string += seperator;
+                sql_string += $"{keyset.Key}=";
+
+                param[c] = sql_string;
+                param[c + 1] = keyset.Value;
+
+                c += 2;
+            }
+
+            return param;
+        }
+    }
+}

Database-Attribute_System/internal/Function.cs

@@ -0,0 +1,182 @@
+using eu.railduction.netcore.dll.Database_Attribute_System.Attributes;
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using System.Text;
+
+namespace eu.railduction.netcore.dll.Database_Attribute_System
+{
+    internal class Function
+    {
+        public static string SqlEscape(string str)
+        {
+            string str_cpy = str.Replace(@"'", @"\'");
+            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)
+        {
+            foreach (object obj in objects)
+            {
+                if (!(obj is object[]))
+                    paramz.Add(obj);
+                else
+                    RecursiveParameterCopying(ref paramz, (object[])obj);
+            }
+        }
+
+        internal static void ConvertAttributeToDbAttributes(Type classType, Dictionary<string, object> attributeNameAndValues)
+        {
+            Dictionary<string, FieldInfo> classFields = ReadDbClassFields(classType);
+
+            foreach (KeyValuePair<string, object> attributeNameAndValue in attributeNameAndValues)
+            {
+                bool nameFound = false;
+                foreach (KeyValuePair<string, FieldInfo> classField in classFields)
+                {
+                    if (attributeNameAndValue.Key.ToLower() == classField.Value.Name.ToLower())
+                    {
+                        attributeNameAndValues.Remove(attributeNameAndValue.Key);
+
+                        attributeNameAndValues.Add(classField.Key, attributeNameAndValue.Value);
+
+                        nameFound = true;
+                        break;
+                    }
+                }
+
+                if (!nameFound) throw new InvalidOperationException($"{attributeNameAndValue.Key} has no classField!");
+            }
+        }
+        internal static void ConvertAttributeToDbAttributes(Type classType, List<string> attributeNames)
+        {
+            Dictionary<string, FieldInfo> classFields = ReadDbClassFields(classType);
+
+            List<string> dbAttributes = new List<string>() { };
+            for(int i=0; i< attributeNames.Count; i++)
+            {
+                bool nameFound = false;
+                foreach (KeyValuePair<string, FieldInfo> classField in classFields)
+                {
+                    if(attributeNames[i].ToLower() == classField.Value.Name.ToLower())
+                    {
+                        attributeNames[i] = classField.Key;
+
+                        nameFound = true;
+                        break;
+                    }
+                }
+
+                if (!nameFound) throw new InvalidOperationException($"{attributeNames[i]} has no classField!");
+            }
+        }
+
+        internal static void ReadDbClassFields<T>(T classObject, ref Dictionary<string, object> dbPrimaryKeys, ref Dictionary<string, object> dbAttributes, ref Dictionary<string, object> dbForeignKeys)
+        {
+            Type classType = typeof(T);
+
+            // Reset lists (just in case)
+            dbPrimaryKeys = new Dictionary<string, object>() { };
+            dbAttributes = new Dictionary<string, object>() { };
+            dbForeignKeys = new Dictionary<string, object>() { };
+
+            // Iterate thru all properties
+            foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
+            {
+                // Check if current field is a db-field
+                if (fi.GetCustomAttribute(typeof(DbPrimaryKey), true) is DbPrimaryKey pkey) // PrimaryKey
+                {
+                    string dbAttributeName = pkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    object value = fi.GetValue(classObject);
+                    dbPrimaryKeys.Add(dbAttributeName, value);
+                }
+                else if (fi.GetCustomAttribute(typeof(DbAttribute), true) is DbAttribute att)   // Attributes
+                {
+                    string dbAttributeName = att._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    object value = fi.GetValue(classObject);
+                    dbAttributes.Add(dbAttributeName, value);
+                }
+                else if (fi.GetCustomAttribute(typeof(DbForeignKey), true) is DbForeignKey fkey)    // ForeignKeys
+                {
+                    string dbAttributeName = fkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    object value = fi.GetValue(classObject);
+                    dbForeignKeys.Add(dbAttributeName, value);
+                }
+            }
+        }
+
+        internal static Dictionary<string, FieldInfo> ReadDbClassFields(Type classType)
+        {
+            Dictionary<string, FieldInfo> dbFields = new Dictionary<string, FieldInfo>();
+
+            // Iterate thru all properties
+            foreach (System.Reflection.FieldInfo fi in classType.GetRuntimeFields())
+            {
+                // Check if current field is a db-field
+                if (fi.GetCustomAttribute(typeof(DbPrimaryKey), true) is DbPrimaryKey pkey) // PrimaryKey
+                {
+                    string dbAttributeName = pkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    dbFields.Add(dbAttributeName, fi);
+                }
+                else if (fi.GetCustomAttribute(typeof(DbAttribute), true) is DbAttribute att)   // Attributes
+                {
+                    string dbAttributeName = att._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    dbFields.Add(dbAttributeName, fi);
+                }
+                else if (fi.GetCustomAttribute(typeof(DbForeignKey), true) is DbForeignKey fkey)    // ForeignKeys
+                {
+                    string dbAttributeName = fkey._attributeName ?? fi.Name;     // If no alternative attribute-name is specified, use the property-name
+                    dbFields.Add(dbAttributeName, fi);
+                }
+            }
+
+            return dbFields;
+        }
+
+        public static string GetDbTableName(Type classType)
+        {
+            // Check if class has attribute 'DbObject' and get the database table-name
+            if (!(classType.GetCustomAttribute(typeof(DbObject), true) is DbObject dbObjectAttribute)) throw new InvalidOperationException($"Cannot generate SQL-Query of '{classType.Name}'. Missing Attribute 'DbObject'");
+            string tableName = dbObjectAttribute._tableName ?? classType.Name;    // If no alternative table-name is specified, use the class-name
+
+            return tableName;
+        }
+
+
+        public static string SqlSerialise(object obj)
+        {
+            if (obj == null)            // Handle null
+            {
+                return "null";
+            }
+            else if (obj.GetType() == typeof(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
+            {
+                return obj.ToString().Replace(",", ".");    // just format to string and form comma to sql-comma
+            }
+            else if (obj.GetType() == typeof(DateTime))        // Handle DateTime
+            {
+                DateTime dateTime = (DateTime)obj;
+                return "'" + SqlSerialise(dateTime) + "'";     // wrap in sql-brackets and convert to sql-datetime
+            }
+            else if (obj.GetType() == typeof(Guid))        // Handle DateTime
+            {
+                string guid = ((Guid)obj).ToString();  // Get Guid as string
+                return "'" + guid + "'";                 // wrap in sql-brackets
+            }
+            else
+            {
+                return null;
+            }
+        }
+    }
+}