java : add MyMyBatis

1 files changed, 75 insertions, 0 deletions

diff --git a/java/MyMyBatis/src/AbstractDAO.java b/java/MyMyBatis/src/AbstractDAO.java
new file mode 100644
index 0000000..916d511
--- /dev/null
+++ b/java/MyMyBatis/src/AbstractDAO.java
@@ -0,0 +1,75 @@
+package ch.asynk;
+
+import java.util.List;
+
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.exceptions.PersistenceException;
+
+public abstract class AbstractDAO<TObject, TMapper>
+{
+    public final int DAO_ERROR = -1;
+    protected Class<TMapper> mapperClass = null;
+
+    public static boolean logErrors = true;
+    private static SqlConnection conn = null;
+
+    static {
+        conn = new SqlConnection();
+        MapperRegistration.registerMappers(conn);
+    }
+
+    static public SqlConnection getSqlConnection() { return conn; }
+
+    protected abstract class CallBack<TRet, TMapper>
+    {
+        public abstract TRet call(TMapper m);
+    }
+
+    protected int execInt(boolean commit, CallBack<Integer, TMapper> cb)
+    {
+        int status = DAO_ERROR;
+        SqlSession session = conn.openSqlSession();
+        try {
+            status = cb.call(session.getMapper(mapperClass));
+            if (commit) session.commit();
+        }
+        catch(PersistenceException e) {
+            if (commit) session.rollback();
+            if (logErrors) conn.error(e);
+        }
+        finally { session.close(); }
+        return status;
+    }
+
+    protected TObject execObject(boolean commit, CallBack<TObject, TMapper> cb)
+    {
+        TObject obj = null;
+        SqlSession session = conn.openSqlSession();
+        try {
+            obj = cb.call(session.getMapper(mapperClass));
+            if (commit) session.commit();
+        }
+        catch(PersistenceException e) {
+            if (commit) session.rollback();
+            if (logErrors) conn.error(e);
+        }
+        finally { session.close(); }
+        return obj;
+    }
+
+    protected List<TObject> execObjects(boolean commit, CallBack<List<TObject>, TMapper> cb)
+    {
+        List<TObject> list = null;
+        SqlSession session = conn.openSqlSession();
+        try {
+            list = cb.call(session.getMapper(mapperClass));
+            if (commit) session.commit();
+        }
+        catch(PersistenceException e) {
+            if (commit) session.rollback();
+            if (logErrors) conn.error(e);
+        }
+        finally { session.close(); }
+        return list;
+    }
+}