重命名Laravel迁移中现有列的错误 [英] A bug with renaming existing column in Laravel migrations

问题描述

我添加了一个新迁移，以重命名旧列.对于我来说，这段代码中的一切似乎都是正确的:

I added a new migration to rename an old column. Everything seems correct in this code, for me:

public function up()
{
   Schema::table('reports', function (Blueprint $table) {
        $table->renameColumn('reporter_id', 'created_by');
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::table('reports', function (Blueprint $table) {
        $table->renameColumn('created_by', 'reporter_id');
    });
}

但是后来我遇到了一个错误:

But then I faced an error:

In Connection.php line 664: SQLSTATE[0A000]: Feature not supported: 1846 ALGORITHM=COPY is not supported. Reason: Columns participating in a foreign key are renamed. Try ALGORITHM=INPLACE. (SQL: ALTER TABLE reports CHANGE reporter_id created_b    y INT NOT NULL)                                                                                                                                                                                                          
In PDOStatement.php line 140: SQLSTATE[0A000]: Feature not supported: 1846 ALGORITHM=COPY is not supported. Reason: Columns participating in a foreign key are renamed. Try ALGORITHM=INPLACE.
In PDOStatement.php line 138: SQLSTATE[0A000]: Feature not supported: 1846 ALGORITHM=COPY is not supported. Reason: Columns participating in a foreign key are renamed. Try ALGORITHM=INPLACE. `

您能帮我解决这个问题吗?

Could you help me to fix this?

推荐答案

我也遇到过这种情况-毫无意义，因为当我使用标准SQL客户端重命名相同的字段时，它就起作用了.但是它只是不能用作迁移脚本.因此，我最终在DB::statement内运行了RENAME，并且对我有用:

I've encountered this too - it makes no sense, because when I use my standard SQL client to rename the same field ... it works. But it just doesn't work as a migration script. Thus, I ended up running the RENAME inside a DB::statement and that worked for me:

     /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {

        DB::statement("ALTER TABLE `mydb`.`mytable`   
          CHANGE `currentfieldname` `newfieldname` 
          INT(10) UNSIGNED NOT NULL;");

    }

这篇关于重命名Laravel迁移中现有列的错误的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！