# Minimalist DB component [hyperf/database](https://github.com/hyperf/database) The function is very powerful, but it is undeniable that the efficiency is indeed a little insufficient. Here is a minimalist `hyperf/db` component that supports `PDO` and `Swoole Mysql`. ## Install ```bash composer require hyperf/db ``` ## Publish component configuration The configuration file for this component is located at `config/autoload/db.php`. If the file does not exist, you can publish the configuration file to the skeleton with the following command: ```bash php bin/hyperf.php vendor:publish hyperf/db ``` ## Component configuration The default configuration `config/autoload/db.php` is as follows, the database supports multi-database configuration, the default is `default`. | configuration item | type | default | remark | |:--------------------:|:------:|:------------------:|:--------------------------------------------------------:| | driver | string | none | The database engine supports `pdo` and `mysql` | | host | string | `localhost` | database address | | port | int | 3306 | database address | | database | string | none | Database default DB | | username | string | none | database username | | password | string | null | database password | | charset | string | utf8 | database charset | | collation | string | utf8_unicode_ci | database collation | | fetch_mode | int | `PDO::FETCH_ASSOC` | PDO Query result set type | | pool.min_connections | int | 1 | The minimum number of connections in the connection pool | | pool.max_connections | int | 10 | The maximum number of connections in the connection pool | | pool.connect_timeout | float | 10.0 | connection wait timeout | | pool.wait_timeout | float | 3.0 | overtime time | | pool.heartbeat | int | -1 | heartbeat | | pool.max_idle_time | float | 60.0 | maximum idle time | | options | array | | PDO configure | ## Component supported methods The specific interface can be viewed `Hyperf\DB\ConnectionInterface`。 | method name | return value | remark | |:----------------:|:--------------:|:-----------------------------------------------------------------------------------:| | beginTransaction | `void` | Open transaction (Support transaction nesting) | | commit | `void` | Commit transaction (Support transaction nesting | | rollBack | `void` | Rollback transaction (Support transaction nesting) | | insert | `int` | Insert data, return the primary key ID, non-auto-incrementing primary key returns 0 | | execute | `int` | Execute SQL to return the number of rows affected | | query | `array` | Query SQL, return a list of result sets | | fetch | `array, object`| Query SQL to return the first row of the result set | | connection | `self` | Specify the database to connect to | ## Use ### Use DB instance ```php get(DB::class); $res = $db->query('SELECT * FROM `user` WHERE gender = ?;', [1]); ``` ### Use static methods ```php This method allows users to directly operate the underlying `PDO` or `MySQL`, so you need to deal with compatibility issues yourself For example, if we want to execute certain queries and use different `fetch mode`, we can customize our own methods in the following ways ```php prepare($sql); $this->bindValues($statement, $bindings); $statement->execute(); return $statement->fetchAll($mode); }); ```