Question

我有功能

CREATE OR REPLACE FUNCTION "public"."GetSoilCod" ( 
  "cod1" integer = 0, 
  "cod2" integer = 0, 
  "cod3" integer = 0, 
  "cod4" integer = 0, 
  "cod5" integer = 0, 
  "cod6" integer = 0, 
  "cod7" integer = 0 
) 
RETURNS varchar AS 
$body$ 
declare result varchar; 
BEGIN 
  result = cast($1 as varchar(2)) || '.' || 
                cast($2 as varchar(2)) || '.' || 
                cast($3 as varchar(2)) || '.' || 
                cast($4 as varchar(2)) || '.' || 
                cast($5 as varchar(2)) || '.' || 
                cast($6 as varchar(2)) || '.' || 
                cast($7 as varchar(2)); 
  return trim('.0' from result); 
END; 
$body$ 
LANGUAGE 'plpgsql' 
VOLATILE 
CALLED ON NULL INPUT 
SECURITY INVOKER 
COST 100;

当我执行此函数并且一个或多个代码被分成10时，此函数的结果是错误的。

示例：

SELECT * FROM "public"."GetSoilCod"(10, 0, 0, 0, 0, 0, 0); 
return: 1 
expected: 10 


SELECT * FROM "public"."GetSoilCod"(10, 20, 0, 0, 0, 0, 0); 
return: 10.2 
expected: 10.20

为什么被训练为0（零）？我只想修剪“.0”（点零点）

如果我执行此查询：

SELECT * FROM "public"."GetSoilCod"(10, 20, 0, 0, 0, 0, 1); 
all its OK 
return & expected is: 10.20.0.0.0.0.1

或：

SELECT * FROM "public"."GetSoilCod"(10, 20, 0, 0, 0, 1, 0);

一切都好。回归＆amp;预计是：10.20.0.0.0.1

我的错误在哪里？

Answer 1

Trim不会将参数视为要删除的单个字符串，它会将其视为无序的字符列表，无论它们从开头，结尾或两者出现的顺序如何，都必须将其删除。

来电trim('.0' from result);与trim('0.' from result);相同，都会导致从字符串末尾删除所有0和.。

SELECT trim('0.' from '100.00')
'1'

请尝试使用regexp_replace：

SELECT regexp_replace('100.0.2.0.0.0', '(\\.0)+$', '')
100.0.2

PostgreSQL 8.4，TRIM错误

1 个答案: