问题描述

在运行 php artisan migrate 时，出现以下错误

While running php artisan migrate, I got the following error

[DoctrineDBALDBALException]
请求的数据库类型未知，DoctrineDBALPlatformsMySqlPlatform 可能不支持.

[DoctrineDBALDBALException]
Unknown database type enum requested, DoctrineDBALPlatformsMySqlPlatform may not support it.

如何解决这个问题.

代码:

public function up() {
    Schema::table('blogs', function (Blueprint $table) {
        $table->string('wordpress_id')->nullable();
        $table->string('google_blog_id')->nullable()->change();
    });
}

推荐答案

官方 Laravel 5.1 文档指出:

The official Laravel 5.1 documentation states:

注意:当前不支持使用枚举列重命名表中的列.

Note: Renaming columns in a table with a enum column is not currently supported.

如果您尝试更改另一列并不重要，如果表包含 enum 任何地方，它都将不起作用.这是 Doctrine DBAL 问题.

It doesn't matter if you're trying to change another column, if the table contains a enum anywhere it won't work. It's a Doctrine DBAL issue.

作为一种解决方法，您可以删除该列并添加一个新列(列数据将丢失):

As a workaround you could either drop the column and add a new one (column data will be lost):

public function up()
{
    Schema::table('users', function(Blueprint $table)
    {
        $table->dropColumn('name');
    });

    Schema::table('users', function(Blueprint $table)
    {
        $table->text('username');
    });
}

或使用 DB 语句:

public function up()
{
    DB::statement('ALTER TABLE projects CHANGE slug url VARCHAR(200)');
}

public function down()
{
    DB::statement('ALTER TABLE projects CHANGE url slug VARCHAR(200)');
}

来源:https://github.com/laravel/framework/issues/1186

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