I'm trying to build a complex query using knex.js, where in the select part I want to select some fields as boolean if they have one of the specific values. The simplified version of the query itself is as in the title of the question like following:
SELECT
"ID",
"Category" IS NOT NULL AND "Category" IN (1, 2) AS "My_Category"
FROM "My_Table";
How could I write it in knex.js? What I have know is that:
knex.select({ID: 'My_Table.ID', My_Category: 'My_Table.Category'})
.from('My_Table);
You can use Raw Queries:
knex.raw('Select ID,Category IS NOT NULL AND Category IN (1, 2) AS My_Category from My_Table where ID = ?', [1]).then(function(resp) { ... });
Or Raw Expressions:
knex('My_Table')
.select(knex.raw('ID,Category IS NOT NULL AND Category IN (1, 2) AS My_Category'))
.where(knex.raw(1))
.orWhere(knex.raw('ID = ?', [1]))
See at:
http://knexjs.org/#Raw-Expressions
Or:
http://knexjs.org/#Raw-Queries
Related
I created a recursive query that returns me a string of the productcategory history (typical parent-child relation:
with recursive productCategoryHierarchy as (
--start with the "anchor" row
select
1 as "level",
pg1.id,
pg1.title,
pg1.parentproductgroup_id
from product_group pg1
where
pg1.id = '17e949b6-85b3-4c87-8f76-ad1e61ea01e1' --parameterize me
union all
-- Get child nodes
select
pch.level +1 as "level",
pg2.id,
pg2.title,
pg2.parentproductgroup_id
from product_group pg2
join productCategoryHierarchy pch on pch.parentproductgroup_id = pg2.id
)
-- Get hierarchy as string
select
CONCAT('',string_agg(productCategoryHierarchy.title, ' > '),'')
from productCategoryHierarchy;
Now I want to use this result in another query as a subquery so that I can use the created string as an attribute in the parent query. Is that possible in Postgres or is there another solution to get a hierarchical tree as string in an attribute?
Are you looking for something like this?
with recursive productcategoryhierarchy as (
...
), aggregated_values as (
select string_agg(productCategoryHierarchy.title, ' > ') as all_titles
from productCategoryHierarchy
)
select ..., (select all_titles from aggregated_values) as all_titles
from ... your main query goes here ..
i have a table foo:
id | items
---+--------------------------------
1 |{"item_1": {"status": "status_1"}}
2 |{"item_2": {"status": "status_2"}}
...
I need to update all rows in column items which is a jsonb and set after {"status": "status"} new values ("new_value": "new_value") and after update the result must look like this:
id | items
---+------------------------------------------------------------
1 |{"item_1": {"status": "status_1", "new_value": "new_value"}}
2 |{"item_2": {"status": "status_2", "new_value": "new_value"}}
...
i've tried to do this:
WITH result AS (
INSERT INTO foo (id, items)
SELECT id, options || newvalue as res
FROM foo AS bar,
jsonb_each(bar.items::jsonb) AS item,
to_jsonb(item.value) AS options,
jsonb_build_object('new_value', 'new_value') as newvalue
WHERE id IN ('1', '2'...)
ON CONFLICT (id)
DO UPDATE
SET items = foo.items || Excluded.items::jsonb RETURNING *)
SELECT item.key AS itemkey
FROM result AS res,
jsonb_each(res.items) AS item,
to_jsonb(item.value) AS options;
but when i run this script the postgres shows this error message:
on conflict do update command cannot affect row a second time postgres
i dont understand what am i doing wrong?
UPDATE#1
Postgres version 9.6
table foo id = TEXT UNIQUE NOT NULL
about why INSERT but not just UPDATE? the answer is this is my mistake first mistake.
after some reading postgres functions finally i find out:
UPDATE foo as t
SET items = result.new_value
FROM (SELECT st.id, new_value
FROM foo AS st
CROSS JOIN LATERAL (
SELECT jsonb_object_agg(the_key, the_value || '{"new_value": "some_new_value"}'::jsonb) AS new_value
FROM jsonb_each(st.items) AS x(the_key, the_value)
LIMIT 1) AS n) AS result
WHERE result.id = t.id;
I'm having problem with using the values of an array column in a where clause. Complete example to reproduce:
create type public.genre_type as enum ('scifi', 'fantasy', 'crime', 'horror', 'classics');
create table public.reader_profile(
id integer,
fave_genres genre_type ARRAY
);
create table public.books(
id serial not null,
title text,
genre_type public.genre_type
);
insert into public.reader_profile(id, fave_genres) values (1, array['crime', 'horror']::public.genre_type[]);
insert into public.reader_profile(id, fave_genres) values (2, array['fantasy', 'scifi']::public.genre_type[]);
insert into public.reader_profile(id, fave_genres) values (3, array['scifi', 'classics']::public.genre_type[]);
insert into public.books(title, genre_type) values ('gone with the wind', 'classics');
insert into public.books(title, genre_type) values ('Foundation', 'scifi');
insert into public.books(title, genre_type) values ('Dune', 'scifi');
-- THE FOLLOWING FAILS!!!
select * from public.books
where genre_type in (
select fave_genres from public.reader_profile where id = 2
);
I've tried ...where genre_type = ANY() per other stackoverflow answers as well as ...where genre_type <# () and I can't get anything to work! It seems the inner query (which works) is being return as an array type and not a list of values or something. Any help appreciated!!
I agree with #Hogan that this seems doable with a JOIN but the syntax you are looking for is the following:
SELECT *
FROM books
WHERE genre_type = ANY(ARRAY(SELECT fave_genres FROM reader_profile WHERE id = 2))
;
Demo
Can I suggest using a join instead?
select *
from public.books b
join public.reader_profile fg on b.genre_type = ANY(rp.fave_genres) and fg.id = 2
I am a newbie here.
I am using PostgreSQL to manipulate lots of data in my specific field of research. Unfortunately, I am encountering a problem that is not allowing me to continue my analysis. I tried to simplify my problem to clearly illustrate it.
Let's suppose I have a table called "Buyers" with those data:
table_buyers
The buyers can make ONLY ONE purchase in each store or none. There are three stores and there a table for each one. Just like below:
table_store1
table_store2
table_store3
To create the tables, I am using the following code:
CREATE TABLE public.buyer
(
ID integer NOT NULL PRIMARY KEY,
name text NOT NULL,
phone text NOT NULL
)
WITH (
OIDS = FALSE
)
;
CREATE TABLE public.Store1
(
ID_buyer integer NOT NULL PRIMARY KEY,
total_order numeric NOT NULL,
total_itens integer NOT NULL
)
WITH (
OIDS = FALSE
)
;
CREATE TABLE public.Store2
(
ID_buyer integer NOT NULL PRIMARY KEY,
total_order numeric NOT NULL,
total_itens integer NOT NULL
)
WITH (
OIDS = FALSE
)
;
CREATE TABLE public.Store3
(
ID_buyer integer NOT NULL PRIMARY KEY,
total_order numeric NOT NULL,
total_itens integer NOT NULL
)
WITH (
OIDS = FALSE
)
;
To add the information on the tables, I am using the following code:
INSERT INTO buyer (ID, name, phone) VALUES
(1, 'Alex', 88888888),
(2, 'Igor', 77777777),
(3, 'Mike', 66666666);
INSERT INTO Store1 (ID_buyer, total_order, total_itens) VALUES
(1, 87.45, 8),
(2, 14.00, 3),
(3, 12.40, 4);
INSERT INTO Store2 (ID_buyer, total_order, total_itens) VALUES
(1, 785.12, 7),
(2, 9874.21, 25);
INSERT INTO Store3 (ID_buyer, total_order, total_itens) VALUES
(2, 45.87, 1);
As all the tables are interconnected by buyer's ID, I wish I could have a query that generates an output just like this:
desired output table.
Please, note that if the buyer did not buy anything in a store, I must print '0'.
I know this is an easy task, but unfortunately, I have been failing on accomplish it.
Using the 'AND' logical operator, I tried the following code to accomplish this task:
SELECT
buyer.id,
buyer.name,
store1.total_order,
store2.total_order,
store3.total_order
FROM
public.buyer,
public.store1,
public.store2,
public.store3
WHERE
buyer.id = store1.id_buyer AND
buyer.id = store2.id_buyer AND
buyer.id = store3.id_buyer;
But, obviously, it just returned 'Igor' as this was the only buyer that have bought items on all three stores (print screen).
Then, I tried the 'OR' logical operator, just like the following code:
SELECT
buyer.id,
buyer.name,
store1.total_order,
store2.total_order,
store3.total_order
FROM
public.buyer,
public.store1,
public.store2,
public.store3
WHERE
buyer.id = store1.id_buyer OR
buyer.id = store2.id_buyer OR
buyer.id = store3.id_buyer;
But then, it returns 12 lines with wrong values (print screen).
Clearly, my mistake is about not considering that 'Buyers' don't have to on all three stores on my code. I just can't correct it on my own, can you please help me?
I appreciate a lot for an answer that can light up my way. Thanks a lot!
Tips about how I can search for this issue are very welcome as well!
Ok. I doubt that this is the final answer for you, but its a start
SELECT
buyer.id,
buyer.name,
COALESCE( gb_store1.total_orders, 0 ) as store1_total,
COALESCE( gb_store2.total_orders, 0 ) as store2_total,
COALESCE( gb_store3.total_orders, 0 ) as store3_total
FROM
public.buyer,
LEFT OUTER JOIN ( SELECT ID_buyer,
SUM( total_orders ) as total_orders,
SUM( total_itens ) as total_itens
FROM public.store1
GROUP BY ID_buyer ) gb_store1 ON gb_store1.id_buyer = buyer.id ,
LEFT OUTER JOIN ( SELECT ID_buyer,
SUM( total_orders ) as total_orders,
SUM( total_itens ) as total_itens
FROM public.store2
GROUP BY ID_buyer ) gb_store2 ON gb_store2.id_buyer = buyer.id ,
LEFT OUTER JOIN ( SELECT ID_buyer,
SUM( total_orders ) as total_orders,
SUM( total_itens ) as total_itens
FROM public.store3
GROUP BY ID_buyer ) gb_store3 ON gb_store3.id_buyer = buyer.id ;
So, this query has a couple elements should focus on. The subselects/groupby allow you to total within your subtables by ID_buyer. The LEFT OUTER JOIN make its so your query can still return a result, even if a subselect finds no matching record. Finally, the COALESCE allows you to return 0 when one of your totals is NULL (because the subselect found no match).
Hope this helps.
How would I get the last inserted ID using a multirow insert?
Here is my code:
$sql='INSERT INTO t (col1, col2, col3) VALUES (1, 2, 3), (4, 5, 6), (7, 8, 9)'; // example
$stmt = $contactsTable->getAdapter()->prepare($sql);
$stmt->execute();
$rowsAdded=$stmt->rowCount(); // mysql_affected_rows
$lastId=$stmt->lastInsertId();
echo '<br>Last ID: '.$lastId;
Also, is there a method in ZF to get the next insert id before an insert?
thanks
$lastId=$contactsTable->getAdapter()->lastInsertId();
This worked.
So, here is the full working code I'm using to create a multi-row insert, getting the rows added and the last inserted id:
$contactsTable = new Contacts_Model_Contacts();
$sql='INSERT INTO t (col1, col2, col3) VALUES (1, 2, 3), (4, 5, 6), (7, 8, 9)'; // example
$stmt = $contactsTable->getAdapter()->prepare($sql);
$stmt->execute();
$rowsAdded=$stmt->rowCount(); // mysql_affected_rows
$lastId=$contactsTable->getAdapter()->lastInsertId(); // last inserted id
echo '<br>Last ID: '.$lastId;
An alternate solution. Move off sql code from controllers and place them in models. That is what they are for.
If you are using models, you can given the name of table which has auto increment column, in class variable.
protected $_name="<table_name>";
Then in your model class method, you can get last insert id from
$insertID= $this->getAdapter()->lastInsertId();
that code should work, but it will only get you the id of your last insert.
you can get the next autoincrement with this mysql query:
SELECT Auto_increment FROM information_schema.tables WHERE TABLE_SCHEMA = 'your_db_name' AND TABLE_NAME='the_table_you_want';