How to close statement when calling in chain sequence

Question

Hi all,
just have a look on below code:
java.sql.connection con =null;
//here getting connection
ResultSet rs= con.createStatement().executeQuery("sql");
its similer to chaining pattern. here I am having question,
with the line:
con.createStatement()
I am creating the statement and later using this object (which is implicit object as i m not having any futher reference of it, is it correct word which i used) i am executing query and getting result set object.
here statement object is implicit object.
is I need to close this object? As per me its too required and i can retrived statement object with the help of resultset object and can use close method.
but what does the java best pratice say? how they handle objects which are created in chain calling.
for example
//this.getPatternCode().getProperty().getName()
thanks,
Pax

Answer 1

In short : stop doing this, it's a bad idea.
You must always close all your resultsets, statements and connections._ Anyone who tells you anything different is wrong. End of story. Failure to properly close JDBC resources can lead to any number of problems including having your program crash and/or having the database crash.
So stop doing that.
There is only one correct practice and it is what is below.
Create the connection and keep a reference to it.
Create the statement (this can be a PreparedStatement or CallableStatement as well) using the connection and keep a reference to it (the statement).
Create the result set using the statement.
Process as needed.
Close the resultset in a finally block.
Close the statement in a finally block
Close the connection in a finally block.