Laravel 未连接 mysql 数据库答案

【问题标题】：Laravel not connected with mysql databaseLaravel 未连接 mysql 数据库
【发布时间】：2016-08-21 13:54:45
【问题描述】：

我是 laravel 的新手，也是 stackoverflow 的新手，我尝试在我的 laravel 应用程序中配置数据库。但它不起作用，并且总是向我显示错误。这是我的 database.php 文件。

database.php

<?php

return [

    /*
    |--------------------------------------------------------------------------
    | PDO Fetch Style
    |--------------------------------------------------------------------------
    |
    | By default, database results will be returned as instances of the PHP
    | stdClass object; however, you may desire to retrieve records in an
    | array format for simplicity. Here you can tweak the fetch style.
    |
    */

    'fetch' => PDO::FETCH_CLASS,

    /*
    |--------------------------------------------------------------------------
    | Default Database Connection Name
    |--------------------------------------------------------------------------
    |
    | Here you may specify which of the database connections below you wish
    | to use as your default connection for all database work. Of course
    | you may use many connections at once using the Database library.
    |
    */

    'default' => 'mysql',

    /*
    |--------------------------------------------------------------------------
    | Database Connections
    |--------------------------------------------------------------------------
    |
    | Here are each of the database connections setup for your application.
    | Of course, examples of configuring each database platform that is
    | supported by Laravel is shown below to make development simple.
    |
    |
    | All database work in Laravel is done through the PHP PDO facilities
    | so make sure you have the driver for your particular database of
    | choice installed on your machine before you begin development.
    |
    */

    'connections' => [

        'sqlite' => [
            'driver'   => 'sqlite',
            'database' => storage_path().'/database.sqlite',
            'prefix'   => '',
        ],

        'mysql' => [
            'driver'    => 'mysql',
            'host'      => 'localhost',
            'database'  => 'horsi',
            'username'  => 'root',
            'password'  => '',
            'charset'   => 'utf8',
            'collation' => 'utf8_unicode_ci',
            'prefix'    => '',
            'strict'    => false,
        ],

        'pgsql' => [
            'driver'   => 'pgsql',
            'host'     => env('DB_HOST', 'localhost'),
            'database' => env('DB_DATABASE', 'horsi'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', ''),
            'charset'  => 'utf8',
            'prefix'   => '',
            'schema'   => 'public',
        ],

        'sqlsrv' => [
            'driver'   => 'sqlsrv',
            'host'     => env('DB_HOST', 'localhost'),
            'database' => env('DB_DATABASE', 'horsi'),
            'username' => env('DB_USERNAME', 'root'),
            'password' => env('DB_PASSWORD', ''),
            'prefix'   => '',
        ],

    ],

    /*
    |--------------------------------------------------------------------------
    | Migration Repository Table
    |--------------------------------------------------------------------------
    |
    | This table keeps track of all the migrations that have already run for
    | your application. Using this information, we can determine which of
    | the migrations on disk haven't actually been run in the database.
    |
    */

    'migrations' => 'migrations',

    /*
    |--------------------------------------------------------------------------
    | Redis Databases
    |--------------------------------------------------------------------------
    |
    | Redis is an open source, fast, and advanced key-value store that also
    | provides a richer set of commands than a typical key-value systems
    | such as APC or Memcached. Laravel makes it easy to dig right in.
    |
    */

    'redis' => [

        'cluster' => false,

        'default' => [
            'host'     => '127.0.0.1',
            'port'     => 6379,
            'database' => 0,
        ],

    ],

];

我还附上了我的 .env 文件

APP_ENV=local
APP_DEBUG=true
APP_KEY=SomeRandomString

DB_HOST=localhost
DB_DATABASE=horsi
DB_USERNAME=root
DB_PASSWORD=

CACHE_DRIVER=file
SESSION_DRIVER=file
QUEUE_DRIVER=sync

MAIL_DRIVER=smtp
MAIL_HOST=mailtrap.io
MAIL_PORT=2525
MAIL_USERNAME=null
MAIL_PASSWORD=null

我也尝试过像这样配置我的数据库

'host'      => env('DB_HOST', 'localhost'),
            'database'  => env('DB_DATABASE', 'horsi'),
            'username'  => env('DB_USERNAME', 'root'),
            'password'  => env('DB_PASSWORD', ''),

但它不起作用，任何人都可以帮助我获得解决方案

错误：用 null 代替用户名和密码

enter image description here

【问题讨论】：

它显示什么错误？例如，如果您尝试使用localhost 作为主机和root 使用 MySQL Workbench 连接到数据库，而无需密码，您可以连接吗？
请不要使用the mysql_ database extension，它已被弃用（在PHP7 中已不复存在）特别是如果您刚刚学习PHP，请花精力学习PDO 数据库扩展。 Start here
坏主意。不要使用 mysql_。您使用具有内部架构的框架。它使用 PDO。请检查我的答案。
添加图片请查看
它显示什么错误？

标签： php mysql laravel laravel-5.2

【解决方案1】：

尝试添加这一行

'default' => env('DB_DEFAULT', 'mysql')

代替

 'default' => 'mysql'

并在 .env 文件中设置DB_DEFAULT=mysql

【讨论】：

并且在这种情况下还需要添加到.env文件DB_DEFAULT=mysql

【解决方案2】：

您使用默认数据库为'default' => 'mysql'

但是.env 配置将在您的配置文件中使用pgsql。

所以如果你要使用 MYSQL，设置这个

'host'     => env('DB_HOST', 'localhost'),
'database' => env('DB_DATABASE', 'horsi'),
'username' => env('DB_USERNAME', 'root'),
'password' => env('DB_PASSWORD', ''),

用于config.php 中的mysql 部分

【讨论】：