How thinkphp uses ORM for database operations

ThinkPHP is a PHP-based web development framework that is fast, simple, safe, and widely used. The system's ORM mapping layer is the most critical, as it can easily handle database operations without writing SQL statements. But sometimes during the development process, there will be situations where SQL statements need to be checked. At this time, we need to let ThinkPHP execute SQL.

In ThinkPHP, there are two cases of using ORM for database operations, one is to operate through the model, and the other is to operate through the Query class.

1. Model operation

Model operation is a way to use ORM to perform database operations. Through model operation, addition, deletion, modification and query operations can be easily performed, and No SQL statements need to be written. Sometimes you need to use pure SQL queries, such as finding the maximum value, minimum value of a column, etc.

Based on model query, ThinkPHP provides a Db class through which native SQL can be executed, as shown below:

use think\facade\Db;

// 执行原生 SQL
Db::query('SELECT * FROM `user` WHERE `id` = 1');

In the above code, we pass Db:: query() method to execute native SQL statements. This method will return an array containing the query results.

2. Query class operation

The Query class is a chain operation class provided in ThinkPHP. It can easily construct SQL statements and supports native SQL queries.

The basic usage of using Query class to operate SQL is as follows:

use think\facade\Db;

$query = Db::table('user');

$data = $query->where('id', 1)
    ->field('id, name')
    ->select();

// 执行原生 SQL
$sql = $query->fetchSql(true)->find();

In the above code, we first obtain a Query class object through the Db::table() method , and then perform chain operations on the Query class object, use the where() method to add query conditions, use the field() method to select the field to be queried, and use select( ) method query results.

If you need to execute native SQL statements, you only need to call the fetchSql(true) method on the Query class object. This method will return the generated SQL statement.

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