Adding Bind variable support for PreparedStatements

```
I've done some local work to solve this for myself, can you add this or would
you need to test more extensively.

1. update Literal.java, by adding before abstract method:
public static final String BINDVARIABLE = "?";

2. update StringLiteral.java's method, by adding after null check:

if (Literal.BINDVARIABLE.equals(s)) return s;

Use this is:
select.addCriteria(new MatchCriteria(, , ,
Literal.BINDVARIABLE));

regards
Mark
```

Original issue reported on code.google.com by `mark.gay...@gmail.com` on 11 Jun 2011 at 6:02

Start by reading Literal.java and StringLiteral.java, then inspect how MatchCriteria is used with PreparedStatements. Verify that the requested bind-variable constant and StringLiteral handling preserve the placeholder, and confirm the documented select usage works as intended.

Written by the indexing model from the issue text.