chore: initial commit

Interface_WebAPI/DatabaseClient/DatabaseFactory.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace DatabaseClient
+{
+    public abstract class DatabaseFactory
+    {
+        public abstract DBClient Create();
+    }
+
+    class MysqlDatabaseFactory : DatabaseFactory
+    {
+        public override DBClient Create()
+        {
+            return new MysqlClient();
+        }
+    }
+
+    class SqliteDatabaseFactory : DatabaseFactory
+    {
+        public override DBClient Create()
+        {
+            return new SqliteClient();
+        }
+    }
+
+    class MssqlDatabaseFactory : DatabaseFactory
+    {
+        public override DBClient Create()
+        {
+            return new MssqlClient();
+        }
+    }
+}