如何在JDBC中执行非查询存储过程

Question

I have a stored procedure in a postgres database. I'm using the postgres JDBC driver to execute a stored procedure, and I do not care about the return type, and can't execute the query. It's indicating that there's a syntax error near the name of the function.

In procedures that return rows, I've been able to do this via a PreparedStatement and setting the parameters, like:

PreparedStatement prepared = connection.prepareStatement("SELECT * FROM NonQueryProcedure(?)");
prepared.setInt(1, 999);
// ....
ResulSet resultSet = prepared.executeQuery();

However, I can't seem to get this to work for an "update" stored procedure where I don't care about the return type. I've tried using connection.prepareStatement() and prepareCall(), and also tried executing it with statement.execute(), .executeUpdate(), and .executeQuery(), without success.

How can I execute a stored procedure where I don't care about the return type?

Answer 1

Without the actual syntax error, I can't say for sure, but try this:

"SELECT * FROM \"getData\"(?)"

CamelCase/PascalCase is a BAD idea in any SQL database. Either it folds it to a single case and all you see is AMASSOFUNREADABLELETTERS or it requires quoting and you will have to forevermore type "aMassofLettersAndQuotesAndShiftKeysAndMyFingersHurt" anytime you want to avoid a syntax error.

Answer 2

As PostgreSQL has no "real" procedures, functions are simply executed using a SELECT statement:

statement.execute("select NonQueryProcedure(?)");

Note that inside a PL/pgSQL function, you can use the perform statement to call such a function. But this is not available outside of a PL/pgSQL block.