fixes #456

Author: wumpz

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -915,7 +915,7 @@ String RelObjectNameExt2():
   String result=null;
 } 
 {
-    ( result=RelObjectNameExt() | tk=<K_TOP>)
+    ( result=RelObjectNameExt() | tk=<K_TOP> | tk=<K_FROM> )
     {
         if (tk!=null) result=tk.image;
         return result;
@@ -2357,10 +2357,10 @@ Expression PrimaryExpression():
 
 JdbcNamedParameter JdbcNamedParameter() : {
     JdbcNamedParameter parameter = new JdbcNamedParameter();
-    Token token;
+    String name;
 }
 {
-    ":" token=<S_IDENTIFIER> { parameter.setName(token.image); }
+    ":" (name=RelObjectNameExt2() { parameter.setName(name); }) 
     {
         return parameter;
     }

src/test/java/net/sf/jsqlparser/test/select/SelectTest.java

@@ -2022,6 +2022,10 @@ public void testNamedParameter2() throws JSQLParserException {
         assertEquals("param2", namedParameter2.getName());
         assertEquals("param3", namedParameter3.getName());
     }
+    
+    public void testNamedParameter3() throws JSQLParserException {
+        assertSqlCanBeParsedAndDeparsed("SELECT * FROM t WHERE c = :from");
+    }
 
     public void testComplexUnion1() throws IOException, JSQLParserException {
         String stmt = "(SELECT 'abc-' || coalesce(mytab.a::varchar, '') AS a, mytab.b, mytab.c AS st, mytab.d, mytab.e FROM mytab WHERE mytab.del = 0) UNION (SELECT 'cde-' || coalesce(mytab2.a::varchar, '') AS a, mytab2.b, mytab2.bezeichnung AS c, 0 AS d, 0 AS e FROM mytab2 WHERE mytab2.del = 0)";