This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
That depends which language you are using. Both are valid syntax in Java, but they mean different things. I think only the one with = is valid SQL syntax, but you should check whether you want "apple" or 'apple' in SQL.
If you try passing s in Java and s is null, then s.equals... will throw a NullPointerException and "apple".equals(s) will evaluate to the value false.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com