Does net.sf.jsqlparser.statement.Statement thread safe?

[leotu]

Should I reusing Statement increases performance？

protected final Map<String, Statement> statementCaches = Collections.synchronizedMap(new WeakHashMap<>());
...
Statement stmt = CCJSqlParserUtil.parse(sql)
...
statementCaches.computeIfAbsent(sql, stmt);
...

[manticore-projects]

Greetings.

You can certainly cache Statements if you are in a situation when you would have to parse similar, but very complex statements many times. Although I have a hard time to construe such a situation.

The more interesting challenge was to decide when a statement is equal. It would depend on a reliable hash of the SQL String -- after replacing any fixed Values (String, Boolean, Double, Long, Date) with parameters.

Determining this hash would depend on parsing the statement -- defeating the purpose.

Long story short: you can cache statements but I wonder why you would want to do that. Maybe you will need to elaborate on the exact challenge you want to overcome.

Cheers.

[wumpz]

I think the question is somewhat strange, since Statement is simply a more or less complex data container and does not do any computation on its own. Or are you asking about the toString approach?