How to use the m method in thinkphp

The m method in thinkphp is the abbreviation of the Model method. The implementation usually used for database operations and data persistence is the Model, which is part of the application. The Model class provides a set of functions for operating the database in the thinkphp framework, which can easily implement operations such as addition, deletion, modification, and query.

Using thinkphp's m method can easily operate the Model class and read and write the database. The basic syntax of the m method is:

$model = M('table');

Among them, 'table' is the name of the table in the database, which can be a string or a variable.

The M method has multiple parameters. The first parameter is the database table name, and the following parameters are the database configuration information, including the database address, user name, password, etc. If the following parameters are not set, the project configuration file will be automatically loaded.

Using the m method can not only create instances of the Model class, but also create instances of other non-Model classes. By instantiating a class using the m method, you can perform corresponding operations on the class and call methods and properties defined by the Model class.

The following is a sample code:

$user = M('user');
$user->where('id=1')->find();

The above code creates a Model class instance named $user, and uses the where() method and find() method to query the ID in the database table The record is 1, and then the query results are stored in the $user variable.

In addition to querying, the m method can also add, modify and delete data. The following is a sample code for adding data:

$user = M('user');
$user->username = 'test';
$user->password = md5('123456');
$user->add();

The above code creates a Model class instance named $user, and uses the add() method to add a record to the database table, including username and password. Two fields, the password is encrypted through the md5 function.

In addition to the common operations in the above examples, the Model class also provides a variety of methods, such as join(), order(), limit(), etc., which can help us perform database operations more flexibly.

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