DB2 java存储过程调用返回错误SQLCODE=-440，SQLSTATE=42884

我正在对 DB2 进行简单的存储过程调用。当它调用存储过程时，它总是返回以下错误：

DB2 SQL Error: SQLCODE=-440, SQLSTATE=42884, SQLERRMC=MEDIAN_RESULT_SET;PROCEDURE, DRIVER=3.66.46

========== Java代码：

String JDBC_DRIVER = "com.ibm.db2.jcc.DB2Driver";
// STEP 2: Register JDBC driver
Class.forName(JDBC_DRIVER);

// STEP 3: Open a connection
System.out.println("Connecting to database..."); 
conn = DriverManager.getConnection(DB_URL, USER, PASS);

// to execute the stored procedure.
System.out.println("CALL median_result_set(?)");
String sql = "CALL median_result_set(?)";
CallableStatement stmt1 = conn.prepareCall(sql);
stmt1.registerOutParameter(1, Types.DOUBLE);

stmt1.execute();
System.out.println("jdbcadapter->callproc after execute " + sql);
stmt1.close();

conn.close();

============= db2 clp 命令行有效：

c:SP>db2 call median_result_set(?)
 Value of output parameters 
 --------------------------
 Parameter Name  : MEDIANSALARY 
 Parameter Value : +7.68582000000000E+004

Result set 1
--------------
NAME      JOB   SALARY
--------- ----- ---------
Marenghi  Mgr    77506.75
O'Brien   Sales  78006.00

=============== 存储过程定义：

CREATE PROCEDURE median_result_set
-- Declare medianSalary as OUT so it can be used to return values
(OUT medianSalary DOUBLE)
RESULT SETS 2
LANGUAGE SQL
BEGIN

   DECLARE v_numRecords INT DEFAULT 1;
   DECLARE v_counter INT DEFAULT 0;

   DECLARE c1 CURSOR FOR
      SELECT salary FROM staff
       ORDER BY CAST(salary AS DOUBLE);

  -- use WITH RETURN in DECLARE CURSOR to return a result set
  DECLARE c2 CURSOR WITH RETURN FOR
   SELECT name, job, salary
   FROM staff 
   WHERE CAST(salary AS DOUBLE) > medianSalary
   ORDER BY salary;

  -- use WITH RETURN in DECLARE CURSOR to return another result set
 DECLARE c3 CURSOR WITH RETURN FOR
    SELECT name, job, salary
    FROM staff
    WHERE CAST(salary AS DOUBLE) < medianSalary
    ORDER BY SALARY DESC;

 DECLARE CONTINUE HANDLER FOR NOT FOUND
   SET medianSalary = 6666; 

 -- initialize OUT parameter
 SET medianSalary = 0;

 SELECT COUNT(*) INTO v_numRecords FROM STAFF;

 OPEN c1;

   WHILE v_counter < (v_numRecords / 2 + 1) DO
     FETCH c1 INTO medianSalary;
     SET v_counter = v_counter + 1;
  END WHILE;
  CLOSE c1;

  -- return 1st result set, do not CLOSE cursor
  OPEN c2;

  -- return 2nd result set, do not CLOSE cursor
  OPEN c3;
END @

基本上“SQLCODE=-440，SQLSTATE=42884”意味着找不到存储过程。

我发现一个很常见的原因是参数不匹配。

对于我的情况，我注意到在java代码中，我必须将模式名称放在存储过程名称前面，例如，我应该执行 SCHEMANAME.median_result_set(?) 而不是 Median_result_set(?)

可以使用一些数据库管理工具找到此 SP 的 SCHEMANAME。

我不需要从命令行指定架构名称的原因：似乎当我使用创建该 SP 时的同一用户从 CLP 命令行调用 SP 时，不需要架构名称（因为在内部）他们匹配）。当然，如果您在命令行指定模式总是正确的。我观察到 DB2 在内部使用用户名作为模式名称。例如，如果“ADMINISTRATOR”创建了一个 SP，那么字符串“ADMINISTRATOR”就是它的模式名称，只要我在 Windows 上看到。