Question

当我将主键从增量更改为字符串（user_id）时，我的迁移中出现了错误。我似乎没有看到我哪里出错了。我的迁移文件没问题，直到我从（ - ＆gt;增量和另一个 - >整数）更改为（ - ＆gt;两者都是字符串）。问题是当它迁移clanmembers表时，它说外键不正确

之前我的代码。似乎没关系，cmd中的迁移没有错误

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->increments('user_id');
        $table->string('fname', 50);
        $table->string('lname', 50);
        $table->integer('age');
        $table->string('gender', 10);
        $table->string('address', 50);
        $table->timestamps();
    });
}

public function up()
{
    Schema::create('clanmembers', function (Blueprint $table) {
        $table->integer('user_id')->unsigned();
        $table->foreign('user_id')->references('user_id')->on('users')->onDelete('cascade');
        $table->integer('clan_id')->unsigned();
        $table->foreign('clan_id')->references('clan_id')->on('clans')->onDelete('cascade');
        $table->string('bandrole', 50);
        $table->timestamps();
    });
}

我的代码现在我改变了 - ＆gt;增量和 - ＆gt;整数到两个 - ＆gt;字符串

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->string('user_id');
        $table->string('fname', 50);
        $table->string('lname', 50);
        $table->integer('age');
        $table->string('gender', 10);
        $table->string('address', 50);
        $table->timestamps();
    });
}

public function up()
{
    Schema::create('clanmembers', function (Blueprint $table) {
        $table->string('user_id');
        $table->foreign('user_id')->references('user_id')->on('users')->onDelete('cascade');
        $table->integer('clan_id')->unsigned();
        $table->foreign('clan_id')->references('clan_id')->on('clans')->onDelete('cascade');
        $table->string('clanrole', 50);
        $table->timestamps();
    });
}

Answer 1

表一

 public function up()
    {
        //
       Schema::create('table_1', function (Blueprint $table) {
        $table->string('user_id',100);
        $table->string('fname', 50);
        $table->string('lname', 50);
        $table->integer('age');
        $table->string('gender', 10);
        $table->string('address', 50);
        $table->timestamps();
        $table->primary(['user_id']);
    });
   }

表二

public function up()
    {
        //
       Schema::create('clanmembers', function (Blueprint $table) {
        $table->string('user_id',100);
        $table->foreign('user_id')->references('user_id')->on('table_1')
        ->onDelete('cascade');
        $table->timestamps();
    });
   }

Answer 2

你需要设置字符串长度 $ table-＆gt; string（＆＃39; user_id＆＃39;，100）; 对于intiger类型，如果未设置长度，则自动转为默认值11。但对于字符串，您需要设置它。

外键错误形成

2 个答案: