Question

我必须将我在SQL中使用的一些查询转换为Oracle代码。我在这方面遇到了很多麻烦。有谁知道任何查询转换器o这样的东西？有人可以为我翻译这部分代码吗？。

这是代码：

SELECT PRUEBA = CASE (SELECT TIMEATT FROM READER WHERE PANELID = DEVID AND READERID = 
MACHINE) WHEN '1' THEN 'P10' ELSE 'P20' END 

+ '0001' 
+ CAST(YEAR(EVENT_TIME_UTC)AS VARCHAR)
+ Right('0' + Convert(VarChar(2), Month(EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DAY(EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(HOUR,EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(MINUTE,EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(SECOND,EVENT_TIME_UTC)), 2) 
+ CAST(YEAR(EVENT_TIME_UTC)AS VARCHAR)
+ Right('0' + Convert(VarChar(2), Month(EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DAY(EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(HOUR,EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(MINUTE,EVENT_TIME_UTC)), 2)
+ Right('0' + Convert(VarChar(2), DATEPART(SECOND,EVENT_TIME_UTC)), 2)
+ Right('00000000' + Convert(VarChar(8), CARDNUM), 8) 
+ Right('00000000' + Convert(VarChar(8), (SELECT SSNO FROM EMP WHERE ID = EMPID)), 8),

FROM events 

  WHERE eventid = 0 AND eventid = 0

  and machine in (11) AND DEVID IN (1,2)
  and CARDNUM <> 0 AND EMPID <> 0
  and EVENT_TIME_UTC between '2006-02-16' AND '2007-02-09'

非常感谢你的帮助，我会继续寻找。

Answer 1

我最近不得不进行从tSQL生活到plSQL（oracle）的相同转换。您发布的代码中有几个“陷阱”：

1）在tSQL中，加号（用于连接）+在plSQL中替换为双管||

2）大多数时候你需要一个“参考光标”（REF CURSOR）声明你的结果就像

PROCEDURE DEMO_SELECT_4_SO(

//other parameters followed by//

P_RESULT OUT REF CURSOR)

IS

BEGIN

OPEN P_RESULT FOR
     SELECT
     //fields///
    FROM
     a_table
    WHERE
    //you want..//

OR （与查询一样的标量结果）正确类型的单个参数，如：

PROCEDURE DEMO_SELECT_4_SO(

//other parameters followed by//

P_RESULT OUT varchar2(60))

IS

BEGIN

     SELECT
     //concatenated fields///
    INTO
       P_RESULT
    FROM
     a_table
    WHERE
    //you want..//

注意在plSQL中选择将所选值分配给目标参数，并且不像在tSQL中那样创建表

3）RIGHT（或LEFT）是plSQL中的SUBSTR函数

我已经从这个链接http://www.techonthenet.com/oracle/index.php找到了很多实用工具来清楚解释plSQL。

Answer 2

试试这个：

SELECT CASE (SELECT timeatt FROM reader WHERE panelid = devid AND readerid = 
       machine) 
         WHEN '1' THEN 'P10' 
         ELSE 'P20' 
       END 
       || '0001' 
       || To_char(event_time_utc, 'RRRRMMDDHH24MISS') 
       || To_char(event_time_utc, 'RRRRMMDDHH24MISS') 
       || Lpad(cardnum, 8, '0') 
       || Lpad((SELECT ssno 
                         FROM   emp 
                         WHERE  id = empid), 8, '0') AS prueba 
FROM   events 
WHERE  eventid = 0 
       AND eventid = 0 
       AND machine IN ( 11 ) 
       AND devid IN ( 1, 2 ) 
       AND cardnum <> 0 
       AND empid <> 0 
       AND event_time_utc BETWEEN TO_DATE('2006-02-16', 'RRRR-MM-DD') AND TO_DATE('2007-02-09', 'RRRR-MM-DD')

将sql查询转换为oracle

2 个答案: