有没有像sqlite3“函数”这样的东西？

Question

Suppose I have a long query in sqlite3 command line as follows:

select col1, col2, col3 from table1
join table2
on table2.table1_id=table1.id
join table3
on table3.table2_id=table_2.id
where col1 like "%some text%";

Now I would like to try this query for different wildcards like "%some text 2%" and "%some text 3%" .

I only know of two options here:

• rewriting the query multiple times in the command line (a pain in the butt)
• committing the whole thing to a script and executing with .read test.sql

Is there another way? Does there exist some function-like concept in sqlite3 which applies here? Ideally I would like to define the "function" and call it from the command line.

Answer 1

SQLite does not support functions.

What you could do, to save you from retyping the main part of the query, is create a view:

create view MyView as
select col1, col2, col3 from table1
join table2
on table2.table1_id=table1.id
join table3
on table3.table2_id=table_2.id

Then you can add the WHERE clause whenever you want to execute it:

SELECT * FROM MyView
WHERE col1 LIKE ?;