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What is the usage of DB::raw in laravel?

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Feb 18, 2022 am 11:17 AM

laravel

In laravel, the "DB::raw()" method is used for complex sql queries. This method can treat the queried result set as a temporary table, and then use laravel's query builder syntax for paging Processing, the syntax is "DB::raw('function or field');".

What is the usage of DB::raw in laravel?

#The operating environment of this article: Windows 10 system, Laravel version 6, Dell G3 computer.

What is the usage of DB::raw in laravel

I encountered a problem in the project, complex sql query, using laravel's query constructor is very inconvenient, various queries Splicing a long list of conditions makes my head hurt; then I want to use native SQL statements to query, and then I can’t use laravel’s paginate() paging method; this is when the DB::raw() method comes in handy! The principle of the syntax is to treat the result set of your query as a temporary table, and then use laravel's query builder syntax for paging processing;

Example 1:

$users = DB::table(&#39;users&#39;)
                   ->select(DB::raw(&#39;count(*) as user_count, status&#39;))
                   ->where(&#39;status&#39;, &#39;<>&#39;, 1)
                   ->groupBy(&#39;status&#39;)
                   ->get();

Example 2:

 DB::table(&#39;someTable&#39;)
->selectRaw(&#39;count(*), min(some_field) as someMin, max(another_field) as someMax&#39;)
->get();

Example 3:

DB::table(&#39;someTable&#39;)->select(
array(
        DB::raw(&#39;min(some_field) as someMin&#39;),
        DB::raw(&#39;max(another_field) as someMax&#39;),
        DB::raw(&#39;COUNT(*) as `count`&#39;)
    )
)->get()

Example 4:

SELECT 
  (CASE WHEN (gender = 1) THEN &#39;M&#39; ELSE &#39;F&#39; END) AS gender_text 
  FROM users;
$users = DB::table(&#39;users&#39;)
  ->select(DB::raw("
  name,
  surname,  
  (CASE WHEN (gender = 1) THEN &#39;M&#39; ELSE &#39;F&#39; END) as gender_text")
);

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