尝试在 IBM DB2 中使用临时 table 并面临问题

Question

我在创建用于测试目的的存储过程时遇到以下错误：

SQL Error [42601]: An unexpected token "DECLARE GLOBAL TEMPORARY TABLE SESSION" was found following "RSOR WITH RETURN FOR". Expected tokens may include: "".. SQLCODE=-104, SQLSTATE=42601, DRIVER=4.21.29

代码：

CREATE OR REPLACE PROCEDURE Test ( IN GE_OutPutType SMALLINT)
----------------------------------------------------------------------------------------------------
 DYNAMIC RESULT SETS 1 LANGUAGE SQL
BEGIN
DECLARE C CURSOR WITH RETURN FOR DECLARE GLOBAL TEMPORARY TABLE
    SESSION.TEMP (DATE CHAR(10) NOT NULL,
    SALARY DECIMAL(9,
    2) ,
    COMM DECIMAL(9,
    2));

INSERT
    INTO
        SESSION.TEMP (DATE,
        SALARY,
        COMM) SELECT
            VARCHAR_FORMAT(CURRENT_DATE,
            'MM/DD/YYYY'),
            10.2,
            11.5
        FROM
            sysibm.sysdummy1 
            
IF GE_OutPutType = 1
        BEGIN
            SELECT
                *
            FROM
                TEMP
            ELSEIF GE_OutPutType = 2 SELECT
                'HEADER' CONCAT SPACE(1979) CONCAT 'H'
            FROM
                sysibm.sysdummy1
            END OPEN C;
END

Answer 1

您的语法无效。

您必须声明您的临时 table 独立于您的光标。

您不能将这些组合在一个语句中。

使用 dynamic-SQL 功能来实现您的需要。

改用格式：

Declare c1 cursor with return to caller for Statement1

和

set v_cursor_text = 'select ... from session.temp; `

然后使用

prepare Statement1 from v_cursor_text;

在退出存储过程之前，您需要让游标保持打开状态：

open c1;

请阅读 Db2 在线文档以了解有关这些功能的更多信息。

这是您的程序的一小段，说明了我的意思：

CREATE OR REPLACE PROCEDURE mytest ( IN GE_OutPutType SMALLINT)
DYNAMIC RESULT SETS 1 
LANGUAGE SQL
specific mytest
BEGIN
    DECLARE v_cursor_text varchar(1024);
    DECLARE C1 CURSOR WITH RETURN FOR Statement1;

    DECLARE GLOBAL TEMPORARY TABLE SESSION.TEMP (
        DATE CHAR(10) NOT NULL,
        SALARY DECIMAL(9,
        2) ,
        COMM DECIMAL(9,
        2))
     with replace on commit preserve rows not logged;

    INSERT INTO SESSION.TEMP (DATE, SALARY, COMM) 
      SELECT VARCHAR_FORMAT(CURRENT_DATE, 'MM/DD/YYYY'),
            10.2,
            11.5
       FROM sysibm.sysdummy1 ;

     if GE_OutPutType = 1
     then 
        set v_cursor_text = 'select * from session.temp';
     end if;
     if GE_OutPutType = 2
     then
        set v_cursor_text = 'select ''header'' concat space(1979) concat ''H'' from sysibm.sysdummy1';
     end if;

     prepare Statement1 from v_cursor_text;
     open c1;
    
            
END@

尝试在 IBM DB2 中使用临时 table 并面临问题

Trying to use temporary table in IBM DB2 and facing issues

db2

db2-luw

ibm-data-studio