java : MyMyBatis : add selectSelf(TObject) -> reload() for free

6 files changed, 26 insertions, 4 deletions

diff --git a/java/MyMyBatis/src/AbstractDAOOperations.java b/java/MyMyBatis/src/AbstractDAOOperations.java
index 90e0ff4..854811a 100644
--- a/java/MyMyBatis/src/AbstractDAOOperations.java
+++ b/java/MyMyBatis/src/AbstractDAOOperations.java
@@ -41,4 +41,9 @@ public abstract class AbstractDAOOperations<TIdentity,
     {
         return execObject(m -> m.selectOne(id));
     }
+
+    public TObject selectSelf(final TObject obj)
+    {
+        return execObject(m -> m.selectSelf(obj));
+    }
 }
diff --git a/java/MyMyBatis/src/AbstractMapper.java b/java/MyMyBatis/src/AbstractMapper.java
index c1ec675..42a0983 100644
--- a/java/MyMyBatis/src/AbstractMapper.java
+++ b/java/MyMyBatis/src/AbstractMapper.java
@@ -17,4 +17,6 @@ public interface AbstractMapper<TIdentity, TObject>
     List<TObject> select();
 
     TObject selectOne(TIdentity id);
+
+    TObject selectSelf(TObject obj);
 }
diff --git a/java/MyMyBatis/src/AbstractModel.java b/java/MyMyBatis/src/AbstractModel.java
index 365472c..7ed83aa 100644
--- a/java/MyMyBatis/src/AbstractModel.java
+++ b/java/MyMyBatis/src/AbstractModel.java
@@ -11,5 +11,9 @@ public interface AbstractModel<TIdentity, TObject>
     default void save() { getDAO().save(self()); }
 
     default int delete() { return getDAO().delete(self()); }
+
+    default void reload() { feedFrom(getDAO().selectSelf(self())); }
+
+    void feedFrom(TObject obj);
 }
 
diff --git a/java/MyMyBatis/src/Main.java b/java/MyMyBatis/src/Main.java
index deb274f..d3b8332 100644
--- a/java/MyMyBatis/src/Main.java
+++ b/java/MyMyBatis/src/Main.java
@@ -39,10 +39,11 @@ public class Main
         System.out.println("update ...");
         m.setName("adios");
         m.save();
-        m = dao.selectOne(2);
-        failIf(m == null , "selectOne()");
-        failIf(!m.getName().equals("adios") , "selectOne()");
-        System.out.println("selectOne : " + m.toString());
+        m.setName("wrong");
+        m.reload();
+        failIf(m == null , "reload()");
+        failIf(!m.getName().equals("adios") , "selectSelf()");
+        System.out.println("selectSelf : " + m.toString());
         count = m.delete();
         failIf(count != 1, "delete()");
         System.out.println("delete : " + count);
diff --git a/java/MyMyBatis/src/Model.java b/java/MyMyBatis/src/Model.java
index daa7938..a8b1bca 100644
--- a/java/MyMyBatis/src/Model.java
+++ b/java/MyMyBatis/src/Model.java
@@ -42,4 +42,10 @@ public class Model implements AbstractModel<Integer, Model>
     {
         return String.format("model [%d] %s", id, name);
     }
+
+    @Override
+    public void feedFrom(Model other)
+    {
+        this.name = other.name;
+    }
 }
diff --git a/java/MyMyBatis/src/ModelMapper.java b/java/MyMyBatis/src/ModelMapper.java
index e71f851..901af2c 100644
--- a/java/MyMyBatis/src/ModelMapper.java
+++ b/java/MyMyBatis/src/ModelMapper.java
@@ -36,4 +36,8 @@ public interface ModelMapper extends AbstractMapper<Integer, Model>
     final static String SELECT_ONE = SELECT + where;
     @Select(SELECT_ONE)
     Model selectOne(Integer id);
+
+    final static String SELECT_SELF = SELECT + where;
+    @Select(SELECT_SELF)
+    Model selectSelf(Model obj);
 }