postgresql与jdbc和存储过程(函数):ResultSet

Question

我只是试图从服务器(getStat)调用存储的函数,看起来像这样:

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';

现在这里是jdbc代码:

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,现在问题是:当我调用它时,它只打印出整个批量的第一行,它应该是打印的.是的,这很清楚,因为我执行以下代码:

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

但是我在while循环中做了同样的事情......并且没有显示任何内容.

也许问题是显而易见的,但我错过了:(

谢谢!

Answer 1

无需使用带{call ...}语法的CallableStatement .

只需使用选择和常规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));
}