I am trying to update a mysql table with following query using Doctrine. But the table is not get updated. Also below code didnt throw any error. I am totally confused. If i run the query, taken from getDQL() method, in mysql directly it showing 0 rows updated becuase of inproper qoutes. it is working after placed proper qoutes for values in the query. Need help to solve this puzzle.
Since i am new to doctrine, i will use the examples give in querybuilder class file.
$support = $this->createQueryBuilder('p')
->update('gcns', 'g')
->set("g.isActive", "0")
->andWhere("g.issn='".$issn."'");
Do you ever execute the query or are you just building it? You should have something along these lines to execute it:
$support->getQuery()->getSingleScalarResult();
If i run the query, taken from getDQL() method, in mysql directly it showing 0 rows updated becuase of inproper qoutes.
getDQL() returns DQL not SQL, so it will have improper quotesif you try to run it directly inside MySQL, but that's expected.
You shouldn't concatenate $issn into your query. You should use parameters instead:
$qb = $this->createQueryBuilder()
$support = $qb->update('gcns', 'g')
->set('g.isActive', '0')
->andWhere( $qb->expr()->eq('g.issn', ':issn') )
->setParameter( 'issn', $issn )
->getQuery()->getSingleScalarResult()
;
Related
Can any Laravel developers help me understand why the following SQL statement is not working. I don't get any errors, it simply doesn't do what it should:
DB::table('devices')
->leftJoin('hotel_device','hotel_device.device_id','devices.id')
->where("hotel_device.device_id","IS","NULL")
->delete();
This should remove all device ids where the leftJoin link returns as NULL (ie. where this device id is not being used in the "hotel_device" table).
If I run it as raw SQL directly in the database it works correctly. Note the "IS" condition rather than "=" condition, as I am refering to a NULL value. (using "=" didn't find any matching rows)
thanks.
You should use the whereNull method to compare to null rather than trying to filter it using the regular where method.
DB::table('devices')
->leftJoin('hotel_device','hotel_device.device_id','devices.id')
->whereNull("hotel_device.device_id")
->delete();
After trying to determine why my SQL statement was returning an error in the Node code I am refactoring to connect to MariaDB rather than via SQL Anywhere, I have narrowed it down to the REPLACE statement we use to compute how many records to process, and how many to skip.
My initial test SQL SELECT statement looks like this:
SELECT customer_name FROM ar.customers
We then use a REPLACE statement to, as I say, determine how many records to process, and how many to skip. When we were using SQL Anywhere that looked like this:
const sql = this.query.replace(/SELECT/i, `SELECT TOP ${recordsPerRun} START AT ${recordsProcessed + 1}`);
That syntax needs to change because MariaDB uses "LIMIT" instead of "TOP". And from my understanding, the first parameter will be the number of records to skip, and the second one how many to return.
So, in my case, it'd be something like:
LIMIT ${recordsProcessed}, ${recordsPerRun}
However, I can't quite get the full syntax right. How can I write this REPLACE statement in a way that will work with my initial test SQL SELECT statement from above? This seems tricky to do since in MariaDB LIMIT now goes at the end of the query, not at the beginning, like TOP did for MySQL.
LIMIT goes at the end, so there's nothing to replace, just concatenate it:
const sql = this.query + ` LIMIT ${recordsProcessed}, ${recordsPerRun}`;
or combine it into the template:
const sql = `${this.query} LIMIT ${recordsProcessed}, ${recordsPerRun}`;
so I'm currently working on a MySQL trigger. I'm trying to assign values to two variables when a new record is inserted. Below are the queries:
SET mssgDocNo = (SELECT Document_ID FROM CORE_MSSG WHERE Message_ID = new.MSSG_ID);
SET mssgRegime = (SELECT CONCAT (Regime_Type, Regime_Code) FROM T_DOC WHERE CD_Message_ID = new.MSSG_ID);;
For some reason, the second SQL query is not picking up the 'new.MSSG_ID' condition while the first query in same trigger recognizes it. I really can't figure out what seems to be the problem.
When I replace the 'new.MSSG_ID' with a hard-coded value from the database in the second query it seems to work. I doubt the 'new.MSSG_ID' is the problem because it works perfectly fine in the first query.
I've tried pretty much anything I could think of. Would appreciate the help.
I would write these more simply as:
SELECT mssgDocNo := Document_ID
FROM CORE_MSSG
WHERE Message_ID = new.MSSG_ID;
SELECT mssgRegime := CONCAT(Regime_Type, Regime_Code)
FROM T_DOC
WHERE CD_Message_ID = new.MSSG_ID;
The SET is not necessary.
I did make one other change that might make it work. I removed the space after CONCAT. Some versions of MySQL have trouble parsing spaces after function calls.
I have a string returned from a function "'aa','bb','cc',..."(the function uses GROUP_CONCAT). I want to use this as a condition in the IN clase of mysql.
SELECT name,class,comment
FROM vwstudent v
WHERE name IN (select func())
I want the query to act like
SELECT name,class,comment
FROM vwstudent v
WHERE name IN ('aa','bb','cc','dd',..)
I assume ('aa','bb','cc','dd',..) is acting as a whole string here and isn't generating any result. What can I do to run this query error less.
I'm not sure if it'll help. But you might be able to hack something together by using PREPARE and EXECUTE as described here: How To have Dynamic SQL in MySQL Stored Procedure
... but that's completely new to me. I've never used anything like that in MySQL.
I have a syntax question regarding the Rails 3 ActiveRecord::Base.connection.execute method and parameter that i want to use with it. I have been fighting with this for some hours now and just do not seem to find any answers to this specific question on the internet.
The database is MySQL.
I need to create a temporary table through SELECT with IN condition statement, where the list of values against which IN should check, is a parameter - rails Array. The code looks like so:
arr = [1,2,3]
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN #{arr}")
I get a MySQL syntax error!
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN #{(arr)}")
Again MySQL syntax error!
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (#{arr})")
MySQL syntax error
The above attempts correspond to this question-answer:
How to execute arbitrary parameterized SQL in rails
I even tried to use in the manner like with find_by_sql, but still get an error:
ActiveRecord::Base.connection.execute(["CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (:ids)",{:ids => arr }]) - obviously, I get an MySQL error.
Am I missing something obvious? Please help! I need this exactly in this way (e.g. create temporary table with exactly such conditions), otherwise a more complicated query based on this one will not work. Thanks!
Here's another option that uses Rails' query sanitization
arr = [1,2,3]
query = "SELECT * FROM objects where id IN (?)"
query = ActiveRecord::Base.send :sanitize_sql_array, [query, arr]
ActiveRecord::Base.connection.execute(query)
If you convert arr.to_s you get "[1, 2, 3]".
I think arr.join(', ') should work.
ActiveRecord::Base.connection.execute("CREATE TEMPORARY TABLE things SELECT * FROM objects WHERE objects.id IN (#{arr.join(', ')})")