laravel query conditions

Laravel is an open source web application framework developed based on PHP language. It has simple, elegant syntax and powerful functions. It is an advanced guide for modern web application development. What is particularly important is its powerful query builder, which allows us to easily build complex SQL query statements without directly manipulating SQL statements.

Through the study of this article, you can learn about common query conditions and their usage in Laravel.

Basic query method

Laravel provides the select() method to select the columns that need to be queried. You can directly pass the column name to this method or use an array to pass the column. name. from() method specifies the table name. For example, the following code can query the id and name columns in the users table:

$users = DB::table('users')
            ->select('id', 'name')
            ->get();

In addition to the select() method, Laravel also provides the where() method to add WHERE constraints. For example, the following code queries all people with the surname "Smith" in the users table:

$users = DB::table('users')
            ->where('name', 'Smith')
            ->get();

OR conditional query

Sometimes, when querying data, we need to use the OR operator to connect multiple conditions , query suitable rows in multiple conditions. You can use the orWhere() method in Laravel to achieve this. The example is as follows:

$users = DB::table('users')
            ->where('name', 'Smith')
            ->orWhere('name', 'Johnson')
            ->get();

The above statement will first query everyone with the surname "Smith", and then query everyone with the surname "Johnson" , and return the union of the two query results.

IN conditional query

In Laravel, you can use the whereIn() method to implement IN conditional query. The following is an example that will query all names starting with w, x, y, z letters in the users table:

$users = DB::table('users')
            ->whereIn('name', ['W%', 'X%', 'Y%', 'Z%'])
            ->get();

BETWEEN Conditional query

Laravel also provides whereBetween( ) method, which is used to query whether the value of a certain field is within the specified range.

The following code will query the users table for people whose age column is between 18 and 30:

$users = DB::table('users')
            ->whereBetween('age', [18, 30])
            ->get();

In addition to the above examples, Laravel also provides some other query methods, such as whereNotBetween (), groupBy(), orderBy(), etc. These methods can help us build complex SQL query statements more easily.

In short, Laravel provides many query conditions to facilitate developers to build the function of querying data according to needs. We only need to be proficient in these methods and use them correctly, and we can quickly build applications that meet our needs.

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