Question

我是DB2查询的新手。

这里，我将逗号分隔值作为存储过程中的IN参数传递。我想在这些价值观的基础上进行搜索。

Select * from USER where user_id in (IN_User);

这里，IN_User将具有该类型的值（'val1'，'val2'，'val3'）

它应该返回所有具有val1或val2或val3的行作为User_id。据我所知，这可以使用UDF完成，但我想知道有没有其他方法可以在没有UDF的情况下完成。

Answer 1

请创建一个函数来拆分逗号分隔的字符串

请参阅以下功能

CREATE FUNCTION StringToRows(
   cString1 CLOB (10 M) ,
   cStringSplitting1 VARCHAR(10) )
RETURNS TABLE (Lines VARCHAR(500))
SPECIFIC StringToRows_Big
DETERMINISTIC
NO EXTERNAL ACTION
CONTAINS SQL
BEGIN ATOMIC
 DECLARE cStringSplitting VARCHAR(10);
 DECLARE LenSplit SMALLINT;
 SET cStringSplitting = cStringSplitting1;
 SET LenSplit = LENGTH(cStringSplitting);

 IF LENGTH(TRIM(cStringSplitting)) = 0 THEN
  SET cStringSplitting = ' ', LenSplit = 1 ;
 END IF ;

RETURN WITH
   TEMP1 ( STRING) as (values (cString1) ),
   TEMP2 ( Lines, STRING_left) as
   (SELECT  
   SUBSTR(STRING,1, CASE WHEN LOCATE(cStringSplitting, STRING) = 0 THEN LENGTH(STRING) ELSE LOCATE(cStringSplitting,STRING) - 1 END),
   (CASE WHEN (LOCATE(cStringSplitting, STRING) = 0) THEN '' ELSE  SUBSTR(STRING, LOCATE(cStringSplitting,STRING) + LenSplit)  END)
   FROM TEMP1 WHERE LENGTH(STRING) > 0
   UNION ALL
     SELECT 
     SUBSTR(STRING_left,1, CASE LOCATE(cStringSplitting,STRING_left) WHEN 0 THEN LENGTH(STRING_left) ELSE LOCATE(cStringSplitting,STRING_left) - 1 END),
     (CASE WHEN LOCATE(cStringSplitting,STRING_left) = 0 THEN '' ELSE SUBSTR(STRING_left,  LOCATE(cStringSplitting,STRING_left) + LenSplit) END)
     FROM TEMP2 WHERE LENGTH(STRING_left) > 0 )
  SELECT Lines FROM TEMP2;
END

请参阅示例存储过程以调用函数

CREATE PROCEDURE  TEST_USR(IN @inputParam CLOB (10 M))
SPECIFIC TEST_USR
DYNAMIC RESULT SETS 1
P1: BEGIN
   DECLARE CURSOR1 CURSOR WITH RETURN FOR
             Select * from USER where user_id IN (SELECT * FROM TABLE(StringToRows(@inputParam, ',')) AS test);
   OPEN CURSOR1;
END P1

将逗号分隔值作为存储过程中的IN参数传递

1 个答案: