From 8a298764e1ad704311740e40396ad4b2618feeb4 Mon Sep 17 00:00:00 2001
From: samskivert <samskivert@6335cc39-0255-0410-8fd6-9bcaacd3b74c>
Date: Tue, 25 Nov 2008 20:12:40 +0000
Subject: [PATCH] The beginnings of support for HSQLDB (a JDBC driver that can
 be used as a purely in-memory database which is very handy for unit testing).
 It's not done yet and doesn't work, but some day I hope to finish integrating
 it.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@2491 6335cc39-0255-0410-8fd6-9bcaacd3b74c
---
 .../com/samskivert/jdbc/HsqldbLiaison.java    | 101 ++++++++++++++++++
 .../com/samskivert/jdbc/LiaisonRegistry.java  |   1 +
 2 files changed, 102 insertions(+)
 create mode 100644 src/java/com/samskivert/jdbc/HsqldbLiaison.java

diff --git a/src/java/com/samskivert/jdbc/HsqldbLiaison.java b/src/java/com/samskivert/jdbc/HsqldbLiaison.java
new file mode 100644
index 00000000..f1fc125e
--- /dev/null
+++ b/src/java/com/samskivert/jdbc/HsqldbLiaison.java
@@ -0,0 +1,101 @@
+//
+// $Id$
+//
+// samskivert library - useful routines for java programs
+// Copyright (C) 2001-2008 Michael Bayne
+// 
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.samskivert.jdbc;
+
+import java.sql.Connection;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+/**
+ * Handles liaison for HSQLDB. NOTE: incomplete and doesn't work yet!
+ */
+public class HsqldbLiaison extends BaseLiaison
+{
+    // from DatabaseLiaison
+    public boolean matchesURL (String url)
+    {
+        return url.startsWith("jdbc:hsqldb");
+    }
+
+    // from DatabaseLiaison
+    public String columnSQL (String column)
+    {
+        return column;
+    }
+
+    // from DatabaseLiaison
+    public String tableSQL (String table)
+    {
+        return table;
+    }
+
+    // from DatabaseLiaison
+    public String indexSQL (String index)
+    {
+        return index;
+    }
+
+    // from DatabaseLiaison
+    public void createGenerator (Connection conn, String tableName, String columnName, int initValue)
+        throws SQLException
+    {
+        // TODO: is there any way we can set the initial AUTO_INCREMENT value?
+    }
+
+    // from DatabaseLiaison
+    public void deleteGenerator (Connection conn, String tableName, String columnName)
+        throws SQLException
+    {
+        // AUTO_INCREMENT does not create any database entities that we need to delete
+    }
+
+    // from DatabaseLiaison
+    public int lastInsertedId (Connection conn, String table, String column) throws SQLException
+    {
+        throw new NotImplementedException();
+//         // MySQL does not keep track of per-table-and-column insertion data, so we are pretty much
+//         // going on blind faith here that we're fetching the right ID. In the overwhelming number
+//         // of cases that will be so, but it's still not pretty.
+//         Statement stmt = null;
+//         try {
+//             stmt = conn.createStatement();
+//             ResultSet rs = stmt.executeQuery("select LAST_INSERT_ID()");
+//             return rs.next() ? rs.getInt(1) : -1;
+//         } finally {
+//             JDBCUtil.close(stmt);
+//         }
+    }
+
+    // from DatabaseLiaison
+    public boolean isTransientException (SQLException sqe)
+    {
+        return false; // no known transient exceptions for HSQLDB
+    }
+
+    // from DatabaseLiaison
+    public boolean isDuplicateRowException (SQLException sqe)
+    {
+        throw new NotImplementedException();
+//         String msg = sqe.getMessage(); // TODO: not sure
+//         return (msg != null && msg.indexOf("Duplicate entry") != -1);
+    }
+}
diff --git a/src/java/com/samskivert/jdbc/LiaisonRegistry.java b/src/java/com/samskivert/jdbc/LiaisonRegistry.java
index 05411dba..7ae79adc 100644
--- a/src/java/com/samskivert/jdbc/LiaisonRegistry.java
+++ b/src/java/com/samskivert/jdbc/LiaisonRegistry.java
@@ -92,5 +92,6 @@ public class LiaisonRegistry
     static {
         registerLiaisonClass(MySQLLiaison.class);
         registerLiaisonClass(PostgreSQLLiaison.class);
+        registerLiaisonClass(HsqldbLiaison.class);
     }
 }