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I'd like to execute something like this on my MySQL server:
SET @id=(SELECT id FROM lookupTable WHERE field=?);
(SELECT * FROM table2 WHERE id=@id)
UNION
(SELECT * FROM table3 WHERE id=@id)
UNION
(SELECT * FROM table4 WHERE id=@id);
This works fine from the console, but not from my Java PreparedStatement. It throws an exception with a syntax error at the ';' separating the statements. I like the variable because I don't have to repeat the lookup clause, but I could rewrite it if necessary. The equivalent JOIN is a little awkward with the UNION clauses too.
Thanks,
Joshua
833
Once a PreparedStatement is prepared, it can be reused after execution. You reuse a PreparedStatement by setting new values for the parameters and then execute it again.
Demonstrating execution of multiple SQL commands on a database simultaneously using the addBatch() and executeBatch() commands of JDBC. The addBatch() command is used to queue the SQL statements and executeBatch() command is used to execute the queued SQL statements all at once.
Something like this eg: String query="select * from tab1;insert into tab1 values(...);update tab1..;delete from tab1...;" Statement st = con1. createStatement(); ResultSet rs = st. executeQuery(query);
There are three types of statements in JDBC namely, Statement, Prepared Statement, Callable statement.
JDBC has never supported parsing delimited queries. Each invocation is one trip to the database. Perhaps you can achieve what you meant to doing PreparedStatement.addBatch() for each separate query, then executing and retrieving the two resultsets ?
173
Just running this as two separate queries (within one connection) should give you same results.
29
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