5 files changed, 33 insertions, 8 deletions
diff --git a/java/MyMyBatis/src/AbstractDAOOperations.java b/java/MyMyBatis/src/AbstractDAOOperations.java
index 5307641..a96e336 100644
--- a/java/MyMyBatis/src/AbstractDAOOperations.java
+++ b/java/MyMyBatis/src/AbstractDAOOperations.java
@@ -2,7 +2,9 @@ package ch.asynk;
 
 import java.util.List;
 
-public abstract class AbstractDAOOperations<TObject, TIdentity, TMapper extends AbstractMapper<TObject, TIdentity>> extends AbstractDAO<TObject, TMapper>
+public abstract class AbstractDAOOperations<TIdentity,
+       TObject extends AbstractModel<TIdentity>,
+       TMapper extends AbstractMapper<TObject, TIdentity>> extends AbstractDAO<TObject, TMapper>
 {
 
     public int insert(final TObject obj)
@@ -15,6 +17,11 @@ public abstract class AbstractDAOOperations<TObject, TIdentity, TMapper extends
         return execInt(m -> m.update(obj), true);
     }
 
+    public int save(final TObject obj)
+    {
+        return (obj.isUnsaved() ? insert(obj) : update(obj));
+    }
+
     public int delete(final TObject obj)
     {
         return execInt(m -> m.delete(obj), true);
diff --git a/java/MyMyBatis/src/AbstractModel.java b/java/MyMyBatis/src/AbstractModel.java
new file mode 100644
index 0000000..81bab76
--- /dev/null
+++ b/java/MyMyBatis/src/AbstractModel.java
@@ -0,0 +1,7 @@
+package ch.asynk;
+
+public interface AbstractModel<TIdentity>
+{
+    boolean isUnsaved();
+}
+
diff --git a/java/MyMyBatis/src/Main.java b/java/MyMyBatis/src/Main.java
index 043e978..ad371f7 100644
--- a/java/MyMyBatis/src/Main.java
+++ b/java/MyMyBatis/src/Main.java
@@ -38,7 +38,7 @@ public class Main
         System.out.println("selectOne : " + m.toString());
         System.out.println("update ...");
         m.setName("adios");
-        dao.update(m);
+        dao.save(m);
         m = dao.selectOne(2);
         failIf(m == null , "selectOne()");
         failIf(!m.getName().equals("adios") , "selectOne()");
@@ -50,8 +50,8 @@ public class Main
         failIf(count != 1, "count()");
         System.out.println("count  : " + count);
         System.out.println("insert ...");
-        m = new Model(-1, "HoMySatan");
-        count = dao.insert(m);
+        m = new Model("HoMySatan");
+        count = dao.save(m);
         failIf(count != 1, "insert()");
         count = dao.count();
         failIf(count != 2, "count()");
diff --git a/java/MyMyBatis/src/Model.java b/java/MyMyBatis/src/Model.java
index 6e817ed..676cdde 100644
--- a/java/MyMyBatis/src/Model.java
+++ b/java/MyMyBatis/src/Model.java
@@ -3,18 +3,29 @@ package ch.asynk;
 import lombok.Setter;
 import lombok.Getter;
 
-public class Model
+public class Model implements AbstractModel<Integer>
 {
     private @Setter @Getter Integer id;
     private @Setter @Getter String name;
 
-    public Model(Integer id, String name)
+    public Model()
     {
-        this.id = id;
+        this.id = null;
+    }
+
+    public Model(String name)
+    {
+        this.id = null;
         this.name = name;
     }
 
     @Override
+    public boolean isUnsaved()
+    {
+        return (id == null);
+    }
+
+    @Override
     public String toString()
     {
         return String.format("model [%d] %s", id, name);
diff --git a/java/MyMyBatis/src/ModelDAO.java b/java/MyMyBatis/src/ModelDAO.java
index 908f35a..dd0e10e 100644
--- a/java/MyMyBatis/src/ModelDAO.java
+++ b/java/MyMyBatis/src/ModelDAO.java
@@ -2,7 +2,7 @@ package ch.asynk;
 
 import java.util.List;
 
-public class ModelDAO extends AbstractDAOOperations<Model, Integer, ModelMapper> implements ModelMapper
+public class ModelDAO extends AbstractDAOOperations<Integer, Model, ModelMapper> implements ModelMapper
 {
     private static final ModelDAO instance = new ModelDAO();