In Laravel, you can use the value() method to query a value.
This method will return the value of the first row and first column of the query result, which is a single value.
Suppose we have a data table named users, which contains the following fields: id, name, email and birthday, now I want to query the user name with id as 1 in the data table. In Laravel, you can use the following method to achieve this:
$name = DB::table('users')->where('id', 1)->value('name'); above The code uses the where() and value() methods of the query builder, where the where() method is used to filter conditions and value( ) method is used to return the value of the first row and first column of the query result. The above code will return the name of the user whose id is 1.
In addition, if you only need to query one value, you can also use the pluck() method.
$name = DB::table('users')->where('id', 1)->pluck('name');pluck() The method is similar to the value() method. It can also return the value of the first row and column of the query result, but pluck () The return value of the method is a Collection object. If you only need to obtain a single value, you also need to use the first() method of the Collection object, for example:
$name = DB::table('users')->where('id', 1)->pluck('name')->first();The above code can also return the user whose id is 1 name.
To summarize, querying a value is very simple in Laravel. You only need to use the value() method or pluck() method of the query builder. During use, you need to choose the appropriate method based on actual needs.
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