init: 北航大学BH-DAS项目首次入库

DatabaseClient/DatabaseFactory.cs

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+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();
+        }
+    }
+}