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[aprssig] Oracle connection ?

Gregg Wonderly gregg at wonderly.org
Thu Jun 23 15:26:23 UTC 2005


scott at opentrac.org wrote:
> I'd also suggest using bind variables if possible.  Generating a SQL
> statement dynamically (e.g. sql = "select * from table where x = '" & xyz &
> "'") can be a security risk if not done right, and even if you're executing
> the same query a million times with different values it's still got to parse
> the statement every time.  If you can use bind variables (e.g. xyz = "foo";
> sql = "select * from table where x = &xyz") then Oracle will be able to
> cache the parsed statement and can process it faster.
> 
> The exact details of how to do it vary depending on the language and
> interface mechanism you're using.  I'd imagine it's possible in JDBC, but I
> don't do much Java myself.
> 
> If you want a starting point, I'll see if I can find the source code for my
> Windows service.

In JDBC, there is

	PreparedStatement st = st.prepareStatement( "select f1,f2,f3 from <table> where f1=? and f2=?");
	st.setString(1,f1Value);
	st.setDouble(2,f2Value);
	ResultSet rs = st.executeQuery();

and then it is supposed to be much more efficient.  I would guess that this would use bind variables or other 
optimizations to help with speed.  I use PreparedStatements against an oracle database and it is definately faster.

Gregg Wonderly




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