stored-procedures - 带有 jdbc 和存储过程(函数)的 postgresql : ResultSet

Question

我只是尝试从服务器 (getStat) 调用一个存储函数，它看起来像这样:

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();
        }

好了，现在问题来了: 当我调用它时，它只打印出整个行的第一行，应该是 printend。是的，这很清楚，因为我执行了以下代码:

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

但我在 while 循环中做了同样的事情......没有显示更多内容。

也许问题很明显，但我错过了:(

谢谢!

Answer 1

无需使用具有 {call ...} 语法的 CallableStatement。

只需使用一个 select 和一个常规的语句:

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));
}