How to write this MySql query on Laravel Controller? - mysql

Question

This is my query on MySql and I want to write it on Laravel. How to write this MySql query on Laravel Controller? Beacuse i try to write it on laravel and the result is different from MySql
SET #row_num=0;
SELECT #row_num:=#row_num+1,
model.name, date,
sum(a), sum(b),
SUM(SUM(b)) OVER(PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW),
IF(#row_num>2, SUM(SUM(b)/3) OVER(PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW) , NULL)
FROM table INNER JOIN model ON table.id_model = model.id
WHERE id_model = 1
GROUP BY date

Answer 1

Step 0: Indent that query so it's easier to work with
I used https://codebeautify.org/sqlformatter for this. The result was the following:
SET
#row_num = 0;
SELECT
#row_num := #row_num + 1,
model.name,
date,
sum(a),
sum(b),
SUM(
SUM(b)
) OVER(
PARTITION BY model.name
ORDER BY
date ROWS BETWEEN 2 PRECEDING
AND CURRENT ROW
),
IF(
#row_num > 2,
SUM(
SUM(b)/ 3
) OVER(
PARTITION BY model.name
ORDER BY
date ROWS BETWEEN 2 PRECEDING
AND CURRENT ROW
),
NULL
)
FROM
table
INNER JOIN model ON table.id_model = model.id
WHERE
id_model = 1
GROUP BY
date
Step 1: Identify different statements.
Your query (or queries) have 2 statements. a SET statement and a SELECT statement.
Step 2: Translate the statements to Query Builder if possible.
Start with the shortest/easier one first
Step 2.1: Translate the SET Statement.
To run a statement where we don't care about the results (just that it runs), DB::statement() can be used. This will mostly be copying the SQL.
DB::statement('SET #row_num = 0');
Step 2.2: Translate the SELECT statement.
For complex SQL queries, the easiest way to translate them is to run them with tinker and check if they are the same when using toSql().
Create a temporary .php file: touch myquery.php.
Write your query work-in-progress in your temp php file, finish with ->toSql(); and dump the results.
Run it through tinker: php artisan tinker myquery.php
Keep working on the query in your temp php file
Repeat steps 3 and 4 until the query is the one you want.
Again, we can start with the easy parts.
SQL
Query Builder
INNER JOIN model ON table.id_model = model.id
join('model', 'table.id_model', 'model.id')
WHERE id_model = 1
where('id_model', 1)
GROUP BY date
groupBy('date')
Now the query should look like this:
$query = DB::table('table')
->join('model', 'table.id_model', 'model.id')
->where('id_model', 1)
->groupBy('date')
->toSql();
As for the columns selected; many of them are aggregate functions so the use of selectRaw() is needed. As the name implies, you pretty much pass raw SQL to it. You can put it all in a single selectRaw() but I prefer to use one per column for readability.
As a result, the final query looks like this:
$query = DB::table('table')
->selectRaw('#row_num := #row_num + 1')
->selectRaw('model.name')
->selectRaw('date')
->selectRaw('sum(a)')
->selectRaw('sum(b)')
->selectRaw('SUM(SUM(b)) OVER (PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW)')
->selectRaw('IF(row_num > 2, SUM(SUM(b)/3) OVER (PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW), NULL)')
->join('model', 'table.id_model', 'model.id')
->where('id_model', 1)
->groupBy('date')
->toSql();
And there, it should be done.
Step 3: Cleanup
Step 3.1: Copy the queries to your Controller or wherever you need to use them.
DB::statement('SET #row_num = 0');
$results = DB::table('table')
->selectRaw('#row_num := #row_num + 1')
->selectRaw('model.name')
->selectRaw('date')
->selectRaw('sum(a)')
->selectRaw('sum(b)')
->selectRaw('SUM(SUM(b)) OVER (PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW)')
->selectRaw('IF(row_num > 2, SUM(SUM(b)/3) OVER (PARTITION BY model.name ORDER BY date ROWS BETWEEN 2 PRECEDING AND CURRENT ROW), NULL)')
->join('model', 'table.id_model', 'model.id')
->where('id_model', 1)
->groupBy('date')
->get();
Step 3.2: Delete temp php file.

Answer 2

You can try DB::statement() or DB::unprepared()