Transactions in ImageViewer

Peter Mount · Peter Mount · commit d261a5ec861c · 1999-05-18T06:07:25.000Z
diff --git a/src/interfaces/jdbc/CHANGELOG b/src/interfaces/jdbc/CHANGELOG
@@ -1,3 +1,6 @@
+Tue May 18 07:00:00 BST 1999
+	- Set the ImageViewer application to use transactions
+
 Tue May 18 00:00:00 BST 1999
 	- Just after committing, I realised why internationalisation isn't
 	  working. This is now fixed (in the Makefile).
diff --git a/src/interfaces/jdbc/example/ImageViewer.java b/src/interfaces/jdbc/example/ImageViewer.java
@@ -192,6 +192,9 @@ public void actionPerformed(ActionEvent e) {
     // Create a statement
     stat = db.createStatement();
     
+    // Set the connection to use transactions
+    db.setAutoCommit(false);
+    
     // Also, get the LargeObjectManager for this connection
     lom = ((postgresql.Connection)db).getLargeObjectAPI();
     
@@ -209,6 +212,7 @@ public void init()
     try {
       stat.executeUpdate("create table images (imgname name,imgoid oid)");
       label.setText("Initialised database");
+      db.commit();
     } catch(SQLException ex) {
       label.setText(ex.toString());
     }
@@ -310,6 +314,7 @@ public void run() {
 	  // our own thread
 	  stat = db.createStatement();
 	  stat.executeUpdate("insert into images values ('"+name+"',"+oid+")");
+	  db.commit();
 	  
 	  // Finally refresh the names list, and display the current image
 	  ImageViewer.this.refreshList();
@@ -372,9 +377,11 @@ public void removeImage()
       
       // Finally delete any entries for that name
       stat.executeUpdate("delete from images where imgname='"+currentImage+"'");
+      db.commit();
       
       label.setText(currentImage+" deleted");
       currentImage=null;
+      db.commit();
       refreshList();
     } catch(SQLException ex) {
       label.setText(ex.toString());
