Question

如标题所示。我正在编写一个很长的SQL脚本来对导入的数据集执行一些QC。许多用户将使用该脚本，我希望他们在脚本之上声明一些变量，这些变量将在整个脚本的其余部分使用，而不需要他们进行批量替换或其他：

declare @lines_in_imported_file int = 13115;
declare @name_of_user varchar(255)  = 'Pr0no';

-- DO NOT CHANGE ANYTHING BELOW THIS LINE

[...]

select * from imported_data where [username] = @name_of_user;

[...]

if (@lines_in_imported_file <> 0)
    select * from imported_data
;

这仅在声明变量并在同一语句中使用时才有效。但是，有没有办法完成这项工作（动态SQL除外）？

[--edit--]

create table [CA131RB01_VARS] (
    name varchar(10)
  , value varchar(10)
);

insert into [CA131RB01_VARS] (name, value) values ('lines_in_imported_file', '13115');
insert into [CA131RB01_VARS] (name, value) values ('name_of_user', 'pr0no');

Answer 1

我的意思是：

declare @lines_in_imported_file int = 13115;
declare @name_of_user varchar(255)  = 'Pr0no';

-- DO NOT CHANGE ANYTHING BELOW THIS LINE

create table [CA131RB01_VARS] (
    name varchar(10)
  , value varchar(10)
);

insert into [CA131RB01_VARS] (name, value) values ('lines_in_imported_file', @lines_in_imported_file);
insert into [CA131RB01_VARS] (name, value) values ('name_of_user', @name_of_user);

[...]

select       * 
from         imported_data id
inner join   [CA131RB01_VARS] vars
      on     vars.value = id.[username]
where        vars.name = 'name_of_user'

[...]

if ((select value from CA131RB01_VARS where name = 'lines_in_imported_file') <> 0)
    select * from imported_data
;

drop table [CA131RB01_VARS];

有没有办法让用户在SQL脚本之上声明变量？

1 个答案: