JDBC - Pl/SQL-Procedure or SQL-Statement???

Question

Hi,
we have got the following problem:
Our program is entirely written in Java. It has to communicate with an ORACLE 8i database (Version 8.1.7). The big question is whether to call pl/sql-procedures which include the sql-statement (select/ insert/update) or to write the sql-statements in the Java-code directly.
We messure the time in our test-database. The procedure took twice the time of the direct statement, althoug the sql-statement had to be parsed each time.
What is the better way: pl/sql-procedure or sql-statements? On which conditions depend the choose?
(For your information: our statements aren't difficult. In our testdatabase aren't much datasources.)
Here is a snippet of our code:
1. PL/SQL-Prozedure:
CallableStatement cs = conn.prepareCall("begin dbrb_test_pkg.test(?,?,?); end;");
cs.registerOutParameter(1, OracleTypes.CURSOR);
cs.registerOutParameter(2, OracleTypes.CURSOR);
cs.registerOutParameter(3, OracleTypes.CURSOR);
cs.execute();
ResultSet rs1 = ((OracleCallableStatement)cs).getCursor(1);
ResultSet rs2 = ((OracleCallableStatement)cs).getCursor(2);
ResultSet rs3 = ((OracleCallableStatement)cs).getCursor(3);
2. SQL-Statements directly in Java-Code:
String statement1b = "SELECT bva_id, bva_datva FROM bva";
ResultSet rs1b = stmt.executeQuery(statement1b);
String statement2b = "SELECT brb_id, brb_datein FROM brb";
ResultSet rs2b = stmt.executeQuery(statement2b);
String statement3b = "SELECT bper_id, bper_nz1 FROM bper";
ResultSet rs3b = stmt.executeQuery(statement3b);
Thanks a lot.
Claudia and Nicole

Answer 1

this is a case-to-case basis.
it's ok to use the Statement/PreparedStatement if you're constructing your SQL or DML (insert/update/delete) statements. like when you're WHERE condition is dynamically created. this can be done also in PL/SQL (CallabeStatement) but passing of data is very tedious for you.
the PL/SQL is much better to use if all your SQL or DML statements are fixed. besides, this is easier to maintain. when you need to change a statement, you don't need to check the statement in SQL prompt then make the necessary changes in your java codes, then compile the class. when you're using PLSQL, you just need to change and recompile the PL you made. then presto! it's done. as long as you don't change the parameters the PL receives and sends, it should perfectly work with your java code. =)