[PATCH 3 of 4] issue1891: Add method to get a discharge table by it's id

[Wald Commits]

# HG changeset patch
# User Andre Heinecke <aheinecke at intevation.de>
# Date 1375093031 -7200
# Node ID ce691d22cee3696aaa87002d5c62ca39e29aa5de
# Parent  f41ba63e7a434329b64d698ecb157f9d43d89ace
issue1891: Add method to get a discharge table by it's id

diff -r f41ba63e7a43 -r ce691d22cee3 backend/src/main/java/org/dive4elements/river/model/DischargeTable.java
--- a/backend/src/main/java/org/dive4elements/river/model/DischargeTable.java	Mon Jul 29 12:16:12 2013 +0200
+++ b/backend/src/main/java/org/dive4elements/river/model/DischargeTable.java	Mon Jul 29 12:17:11 2013 +0200
@@ -24,6 +24,10 @@
 import javax.persistence.SequenceGenerator;
 import javax.persistence.Table;
 
+import org.hibernate.Session;
+import org.hibernate.Query;
+import org.dive4elements.river.backend.SessionHolder;
+
 @Entity
 @Table(name = "discharge_tables")
 public class DischargeTable
@@ -197,5 +201,16 @@
             return 0;
         }
     }
+
+    public static DischargeTable getDischargeTableById(int dtId)
+    {
+        Session session = SessionHolder.HOLDER.get();
+        Query query = session.createQuery(
+            "from DischargeTable where id =:dtId");
+        query.setParameter("dtId", dtId);
+
+        List<DischargeTable> list = query.list();
+        return list.isEmpty() ? null : list.get(0);
+    }
 }
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