Question

I am using postgres 9.1 and java code for jdbc.

I may use a order by clause in my sql query string

I just want to get the meta data information of the query to find whether the query has order by clause or not. If it has then how many fields has been specified in the order by clause.

Ex:
order by age
order by age, name
order by age asc, name desc

In these example I just want to retrieve the number of parameters that are specified in the order by clause and their column names.

Answer 1

If your are getting your query as string you could simply parse it.

i.e. To figure out that ORDER BY is there

"SELECT * FROM MyTable ORDER BY SomeColumn".toLowerCase().indexOf("order by") // if it's return -1 query does not contains order by section otherwise it returns start index for first occurence "ORDER BY" in given string

For more complex searching in string you may need to use RegExp