在 Firebird 3.0 bigint 与 Firebird 2.5 integer 中计数

Question

On my system, after the migration from Firebird 2.5 to 3.0, many reports and other functions began to give problems stating that what was expected was Integer and the current one is LargeInt . I took a look and saw that some searches with the count in 3.0 return a bigInt column, while in 2.5 it returns an integer column.

To solve the way I know, I would have to cast a cast on everything that is giving error, tested and worked, but it is a big system, it will give a lot of work.

Does anyone know of any way to resolve this in Firebird itself? Some configuration, or something?

Answer 1

There is no configuration for it; the Firebird 3 release notes only say :

The COUNT() aggregator now returns its result as BIGINT instead of INTEGER .

You either need to explicitly apply a cast in your queries, or in your code, or see if your data access library can explicitly request integer instead of just the dynamic type. For example in the Java world the JDBC API has an explicit getInt which will work for BIGINT as long as the value fits in a 32 bit integer.

Answer 2

我使用 Unidac，对于解决方案，我使用了 Map Rules（数据类型映射）。

Answer 3

Use TYPECAST in SQL in any delphi component and will be ok. For example wite:

select
cast(count(*) as integer) BR
from ...

instead of

select
count(*) BR
from ...