ORA-29481：從JDBC

Question

呼籲甲骨文12C過程時隱結果不能返回到客戶端我寫了這樣的PL/SQL程序：

CREATE OR REPLACE PROCEDURE p_5666 (
    id1 NUMBER := NULL, 
    id2 NUMBER := NULL, 
    id3 NUMBER := NULL 
) IS 
    c1 SYS_REFCURSOR; 
    c2 SYS_REFCURSOR; 
    c3 SYS_REFCURSOR; 
BEGIN 
    IF id1 IS NOT NULL THEN 
    OPEN c1 FOR SELECT first_name, last_name FROM t_author WHERE id = id1; 
    dbms_sql.return_result (c1); 
    END IF; 

    IF id2 IS NOT NULL THEN 
    OPEN c2 FOR SELECT title FROM t_book WHERE id = id2; 
    dbms_sql.return_result (c2); 
    END IF; 

    IF id3 IS NOT NULL THEN 
    OPEN c3 FOR SELECT id3 AS id FROM dual; 
    dbms_sql.return_result (c3); 
    END IF; 
END; 

而現在，我想從Java調用上述過程使用JDBC如下（algorithm inspired by this article和this one）：

try (Connection cn = new oracle.jdbc.OracleDriver().connect(url, properties); 
    Statement s = cn.createStatement()) { 
    boolean result = s.execute("begin p_5666(1, 2, 3); end;"); 

    fetchLoop: 
    for (int i = 1;; i++) { 

     // Note, this call seems to be required in Oracle even for the first result set. 
     // In other JDBC drivers (e.g. MySQL, SQL Server), this would skip the first result 
     result = s.getMoreResults(); 

     if (result) 
      try (ResultSet rs = s.getResultSet()) { 
       System.out.println("\nResult " + i + ":"); 
       ResultSetMetaData meta = rs.getMetaData(); 

       while (rs.next()) 
        IntStream.rangeClosed(1, meta.getColumnCount()) 
        // Using jOOλ's wrapper for lambdas throwing checked exceptions 
          .mapToObj(Unchecked.intFunction(
            j -> meta.getColumnName(j) + ": " + rs.getObject(j))) 
          .forEach(System.out::println); 
      } 
     else if ((s.getUpdateCount()) == -1) 
      break fetchLoop; 
    } 
} 

不幸的是，上述的引發以下例外：

java.sql.SQLException: ORA-29481: Implicit results cannot be returned to client. 
ORA-06512: at "SYS.DBMS_SQL", line 2785 
ORA-06512: at "SYS.DBMS_SQL", line 2779 
ORA-06512: at "TEST.P_5666", line 9 
ORA-06512: at line 1 

這是什麼原因？

Answer 1

我還在使用11g版本的ojdbc驅動程序。升級到的ojdbc一個12C版本固定的問題，併產生預期的結果：

結果1：
FIRST_NAME：喬治
LAST_NAME：奧威爾

結果2：
TITLE：動物農場

結果3：
ID：3

This is also explained in this article。