帶有jdbc和存儲過程（函數）的PostgreSQL：ResultSet

Question

我只是嘗試從服務器（getStat）調用存儲的函數，看起來像這樣：

create type stat as (type text, location text, number int);
create function getStat() returns setof stat as 'select distinct table1.type, table1.location, table1.number from table1, table2 where table2.finding=10 order by number desc;' language 'sql';

現在，這里是jdbc代碼：

CallableStatement callable = null;

    String storedProc = "{call getStat(?, ?, ?)}";

    try {
        callable = connection.prepareCall(storedProc);

        callable.registerOutParameter(1, java.sql.Types.VARCHAR);
        callable.registerOutParameter(2, java.sql.Types.VARCHAR);
        callable.registerOutParameter(3, java.sql.Types.INTEGER);

        boolean results = callable.execute();

        System.out.println(callable.getString(1));
        System.out.println(callable.getString(2));
        System.out.println(callable.getInt(3));

        while(results){
            ResultSet rs = callable.getResultSet();
            while(rs.next()){
                System.out.println(rs.getString(1));
                System.out.println(rs.getString(2));
                System.out.println(rs.getInt(3));
            }
            //rs.close();

            results = callable.getMoreResults();
        }

好的，現在是問題所在：當我調用它時，它只是打印出第一行，應該是printend。 是的，很明顯，因為我執行以下代碼：

            System.out.println(callable.getString(1));
            System.out.println(callable.getString(2));
            System.out.println(callable.getInt(3));

但是我在while循環中做了同樣的事情……並且什么也沒有顯示。

也許問題很明顯，但是我很想念:(

謝謝！

Answer 1

無需使用帶有{call ...}語法的CallableStatement。

只需使用select和常規Statement ：

Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select * from getStat()");
while (rs.next())
{
  System.out.println(rs.getString(1));
  System.out.println(rs.getString(2));
  System.out.println(rs.getInt(3));
}