带有jdbc和存储过程(函数)的PostgreSQL:ResultSet [英] postgresql with jdbc and stored procedures (functions): ResultSet

问题描述

我只是试图从服务器(getStat)调用存储的函数，如下所示:

I just tried to call a stored function from the server (getStat), that is looking like this:

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';

现在这是jdbc代码:

Now here is the jdbc code:

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，现在是问题所在: 当我调用它时，它只是打印出第一行，应该全部打印出来.是的，很明显，因为我执行以下代码:

Okay, and now the problem: When I am calling it, it just prints out the first line, of the whole bulk, that should be printend. Yeah, that is clear, because I execute the following code:

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

但是我在while循环中做同样的事情……并且什么也没有显示.

But I do the same in the while loop...and nothing more is displayed.

也许问题很明显，但我很想念:(

Maybe the problem is something obvious, but I am missing that :(

谢谢！

推荐答案

无需使用具有{call ...}语法的CallableStatement.

No need to use a CallableStatement with the {call ...} syntax.

只需使用select和常规Statement:

Just use a select and a regular 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));
}

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