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[SOLVED] validate integer value in query


o3d

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Good day,

 

I need help to determine if a field in my where clause is in fact a valid integer value.

 

I don't know how to do exception handling in a query so any help would be appreciated.

 

I suppose the query could look something like:

 

select cast(field2 as decimal) as field2

from table1

where is_number(field2) = 't'

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  • 2 weeks later...

Thanks for the reply, but when you see if a value is > 0, I assume postgres also checks that it is not null. So nope, didn't work.

 

--query

select cast(a.field1 as decimal)

from (

select '1' as field1 union

select 'two' union

select '3'

) as a

where

a.field1 > 0

 

--result

ERROR: invalid input syntax for type numeric: "two"

SQL state: 22P02

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  • 1 month later...

I found a solution, don't know why i haven't looked at this before. I used a plain simple regular expression to determine if the value contains numeric values:

 

select cast(a.field1 as decimal)

from (

  select '1' as field1 union

  select 'two' union

  select '3'

) as a

where

  a.field1 ~ '^\\d+$'

 

This query will only return fields which contains numeric values.

 

RESULT

?column?

--------

1

3

 

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