I'm using the knex v0.19.1 with Node.js. I've searched through entire Docs of knex.js but didn't find a way to reset AUTO_INCREMENT to specific value knex way. Is there any workaround to achieve this? or i need to execute the pure query as alter table TAB_NAME set AUTO_INCREMENT = 45 by sqlite3 driver itself?
Yes. You need to use raw query to do that, but you can do it for example with knex.schema.raw(). No need to use sqlite3 driver directly.
Related
I would like to a bulk update in sequelize. Unfortunately it seems like sequelize does not support bulk updates I am using sequelize-typescript if that helps and using postgresql 14
My query in raw SQL looks like this
UPDATE feed_items SET tags = val.tags FROM
(
VALUES ('ddab8ce7-afa3-824f-7b65-edfb53a71764'::uuid,ARRAY[]::VARCHAR(255)[]),
('ece9f2fc-2a09-4a95-16ce-07293b0a14d2'::uuid,ARRAY[]::VARCHAR(255)[])
) AS val(id, tags) WHERE feed_items.id = val.id
I would like to generate this query from a given array of string and array values. The tags is implemented as a string array in my table.
Is there a way to generate the above query without using raw query?
Or an SQL injection safe way of generating the above query?
I have a table in my database which stores a list of string values as a jsonb field.
create table rabbits_json (
rabbit_id bigserial primary key,
name text,
info jsonb not null
);
insert into rabbits_json (name, info) values
('Henry','["lettuce","carrots"]'),
('Herald','["carrots","zucchini"]'),
('Helen','["lettuce","cheese"]');
I want to filter my rows checking if info contains a given value.
In SQL, I would use ? operator:
select * from rabbits_json where info ? 'carrots';
If my googling skills are fine today, I believe that this is not implemented yet in JOOQ:
https://github.com/jOOQ/jOOQ/issues/9997
How can I use a native predicate in my query to write an equivalent query in JOOQ?
For anything that's not supported natively in jOOQ, you should use plain SQL templating, e.g.
Condition condition = DSL.condition("{0} ? {1}", RABBITS_JSON.INFO, DSL.val("carrots"));
Unfortunately, in this specific case, you will run into this issue here. With JDBC PreparedStatement, you still cannot use ? for other usages than bind variables. As a workaround, you can:
Use Settings.statementType == STATIC_STATEMENT to prevent using a PreparedStatement in this case
Use the jsonb_exists_any function (not indexable) instead of ?, see https://stackoverflow.com/a/38370973/521799
I know there is no support for updateOnDuplicate for postgresQL by Sequelize sequelize doc, so is there a work around for this?
Can it be implemented via "SQL command".
New sequelize (v5) includes updateOnDuplicate feature for all dialects
Fields to update if row key already exists (on duplicate key update)?
(only supported by MySQL, MariaDB, SQLite >= 3.24.0 & Postgres >=
9.5). By default, all fields are updated.
Check here : Docs
You can use as
model.bulkCreate(dataToUpdate, { updateOnDuplicate: ["user_id", "token", "created_at"] })
There is some work around. See upsert function. When used in Postgresql it creates custom function in database. Unfortunately there is no bulkUpsert, so you either use it in some for-loop or execute raw SQL as suggested here.
I'm a newbie in Nodejs and I want to send data to the client when an update occurs on MySQL. So I found the ORM, Sequelize.
Can I know an update event from MySQL using Sequelize? Or how can I know an update event on MySQL using Nodejs with MySQL?
In case of MySql, triggers are the best option.
MySQL Triggers: a trigger or database trigger is a stored program executed automatically to respond to a specific event e.g., insert, update or delete occurred in a table.
For example:- You can have an audit table to save information regarding DATABASE updates or inserts.
Audit table sample for a employee table.
CREATE TABLE employees_audit (
id INT AUTO_INCREMENT PRIMARY KEY,
employeeNumber INT NOT NULL,
lastname VARCHAR(50) NOT NULL,
changedat DATETIME DEFAULT NULL,
action VARCHAR(50) DEFAULT NULL
);
Defining a trigger on employees table
DELIMITER $$
CREATE TRIGGER before_employee_update
BEFORE UPDATE ON employees
FOR EACH ROW
BEGIN
INSERT INTO employees_audit
SET action = 'update',
employeeNumber = OLD.employeeNumber,
lastname = OLD.lastname,
changedat = NOW();
END$$
DELIMITER ;
Then, to view all triggers in the current database, you use SHOW TRIGGERS statement as follows:
SHOW TRIGGERS;
At you backend you can have a polling mechanism (interval based db check) for audit table updates and notify the client accordingly.
This can be done with a simple query to check for employees_audit update either by checking the row cound or based on created date time.
In case you donot need this extra table, you can have the same polling logic to check for updates on the employees table itself based on the update_at date time filed.
For MySQL, the easiest solution would be to set up something to 'tail' MySQL binlogs, such as zongji.
The other, less ideal/trivial solution would be to set up triggers in your database that call out to a custom database plugin that communicates with your process in some way.
You can use https://www.npmjs.com/package/mysql-events
A Node JS NPM package that watches a MySQL database and runs callbacks on matched events.
I am planning to use the Update...USING TIMESTAMP... statement to make sure that I do not overwrite fresh data with stale data while having to avoid doing at least LOCAL_QUORUM writes.
Here is my table structure.
Table=DocumentStore
DocumentID (primaryKey, bigint)
Document(text)
Version(int)
If the service receives 2 write requests with Version=1 and Version=2, regardless of the order of arrival, the business requirement is that we end up with Version=2 in the database.
Can I use the following CQL Statement?
Update DocumentStore using <versionValue>
SET Document=<documentValue>,
Version=<versionValue>
where DocumentID=<documentIDValue>;
Has anybody used something like this? If so was the behavior as expected?
Yes, this is a known technique. Although it should be
UPDATE "DocumentStore" USING TIMESTAMP <versionValue>
SET "Document" = <documentValue>,
"Version" = <versionValue>
WHERE "DocumentID" = <documentIDValue>;
You missed a TIMESTAMP keyword, and also since you are using case sensitive names, you should enclose them in quotes.