added entity class to dbset

src/main/java/jef/DbSet.java

@@ -4,16 +4,20 @@ import jef.expressions.Expression;
 import jef.expressions.SelectExpression;
 import jef.expressions.TableExpression;
 import jef.expressions.selectable.DatabaseSelectAllExpression;
+import jef.serializable.SerializableObject;
+import lombok.Getter;
 
-import java.io.Serializable;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Spliterator;
 
-public class DBSet<T extends Serializable> implements Queryable<T> {
+public class DbSet<T extends SerializableObject> implements Queryable<T> {
+    @Getter
+    private final Class<T> clazz;
     private final String table;
 
-    public DBSet(String table) {
+    public DbSet(Class<T> clazz, String table) {
+        this.clazz = clazz;
         this.table = table;
     }
 
@@ -48,22 +52,22 @@ public class DBSet<T extends Serializable> implements Queryable<T> {
     }
 
     @Override
-    public DBSet<T> sequential() {
+    public DbSet<T> sequential() {
         return this;
     }
 
     @Override
-    public DBSet<T> parallel() {
+    public DbSet<T> parallel() {
         return this;
     }
 
     @Override
-    public DBSet<T> unordered() {
+    public DbSet<T> unordered() {
         return this;
     }
 
     @Override
-    public DBSet<T> onClose(Runnable runnable) {
+    public DbSet<T> onClose(Runnable runnable) {
         return this;
     }
 

src/main/java/jef/serializable/SerializableObject.java

@@ -0,0 +1,6 @@
+package jef.serializable;
+
+import java.io.Serializable;
+
+public class SerializableObject implements Serializable {
+}