How to use query constructor in Laravel

This article introduces the knowledge of "how to use query constructor in Laravel". Many people will encounter this dilemma in the operation of actual cases, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

In many complex queries, native statements are often needed to query. In laravel, we can use native queries in this way

$user = DB::select ('select * from users where id=?', [1])

Query Builder https://laravel-china.org/docs/laravel/5.5/queries#where-clauses

$sql ='(FROM table_name1 LEFT JOIN table_name2 ON table_name1.id=table_name2.id)'; $res = $DB::table (DB::raw ($sql))-> where ([["id" = > 1]])-> paginate (10)

Here, $sql acts as a view chart (temporary table), which can be a more complex federated query

So we can use "where", "paginate" and other builders

It is important to note that the sql string is enclosed in parentheses'()', otherwise an error will occur.

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