- Added changeColumn, which allows you to change a column's definition.

Can be used to change the name of a column as well (I.e., the definition
  is the same except you give it a new name.)
--This   line, and those below, will be ignored--

M    src/java/com/samskivert/jdbc/JDBCUtil.java


git-svn-id: https://samskivert.googlecode.com/svn/trunk@1591 6335cc39-0255-0410-8fd6-9bcaacd3b74c

projects/samskivert/src/java/com/samskivert/jdbc/JDBCUtil.java

@@ -323,6 +323,34 @@ public class JDBCUtil
                  "'.");
     }
 
+    /**
+     * Changes a column's definition. Takes a full column definition
+     * 'cdef' (including the name of the column) with which to replace the
+     * specified column 'cname'.
+     *
+     * NOTE: A handy thing you can do with this is to rename a column by
+     * providing a column definition that has a different name, but the
+     * same column type.
+     */
+    public static void changeColumn (Connection conn, String table,
+                                     String cname, String cdef)
+        throws SQLException
+    {
+        String update = "ALTER TABLE " + table + " CHANGE " + cname + " " +
+            cdef;
+
+        PreparedStatement stmt = null;
+        try {
+            stmt = conn.prepareStatement(update);
+            stmt.executeUpdate();
+        } finally {
+            close(stmt);
+        }
+
+        Log.info("Database column '" + cname + "' of table '" + table +
+                 "' modified to have this def '" + cdef + "'.");
+    }
+
     /**
      * Removes a named index from the specified table.
      */