Php 外键约束的格式不正确是一个问题

我在尝试迁移外键时遇到此错误

Schema::create('people', function (Blueprint $table) {
        $table->id();
        $table->timestamps();
        $table->unsignedBigInteger('PersonId');
        $table->integer('PersonRole');
        $table->string('PersonName');
        $table->string('Email')->unique();
        $table->string('Password');
        $table->string('Address');
        $table->string('Gender');
        $table->date('DoB');
    });

Schema::create('flowers', function (Blueprint $table) {
        $table->id();
        $table->timestamps();
        $table->unsignedBigInteger('FlowerId');
        $table->string('Category');
        $table->string('FlowerName');
        $table->integer('FlowerPrice');
        $table->string('Description');
        $table->string('FlowerImage');
    });

Schema::create('transactions', function (Blueprint $table) {
        $table->id();
        $table->timestamps();
        $table->unsignedBigInteger('TransactionId');
        $table->dateTime('Time');
        $table->integer('PersonId')->unsigned();
    });

 Schema::table('transactiondetails', function (Blueprint $table) {
        $table->foreign('FlowerId')->references('FlowerId')->on('Flowers')->onUpdate('cascade')->onDelete('cascade');
        $table->foreign('TransactionId')->references('TransactionId')->on('Transactions')->onUpdate('cascade')->onDelete('cascade');
    });

Schema::table('transactions', function (Blueprint $table) {
        $table->foreign('PersonId')->references('PersonId')->on('People')->onUpdate('cascade')->onDelete('cascade');
    });

我试图更改迁移顺序，并确保所有变量具有相同的数据类型

请帮我解决这个问题

---

谢谢

如果确实要为非主键创建外键，则该外键必须是具有唯一约束的列

因此，在您的情况下，如果您将

FlowerId

&

PersonId

设置为唯一的，它将被允许作为MySQL规则。如果你不能应用一个独特的约束，那你就不走运了，但是如果你仔细想想，这确实是有意义的

如果您有一个非常好的主键，为什么不使用它：

Schema::table('transactiondetails', function (Blueprint $table) {
     $table->foreign('FlowerId')->references('id')->on('Flowers')->onUpdate('cascade')->onDelete('cascade');
     $table->foreign('TransactionId')->references('id')->on('Transactions')->onUpdate('cascade')->onDelete('cascade');
});

Schema::table('transactions', function (Blueprint $table) {
     $table->foreign('PersonId')->references('id')->on('People')->onUpdate('cascade')->onDelete('cascade');
});

试试这个

外键是一列或列的组合，其值与另一个表中的主键匹配。（因此您不使用主键）

---

如果不首先实际定义列，则不能指示列是外键。通常先定义它，然后将其指定为外键。但是，从第7版开始，您也可以使用异化

Schema::table('transactiondetails', function (Blueprint $table) {
     $table->foreignId('FlowerId')->constrained('Flowers')->onUpdate('cascade')->onDelete('cascade'); 
     $table->foreignId('TransactionId')->constrained('Transactions')->onUpdate('cascade')->onDelete('cascade'); 
});

Schema::table('transactions', function (Blueprint $table) {
     $table->foreignId('PersonId')->constrained('People')->onUpdate('cascade')->onDelete('cascade');
});

Schema::table('transactiondetails', function (Blueprint $table) {
     $table->foreignId('FlowerId')->constrained('Flowers')->onUpdate('cascade')->onDelete('cascade'); 
     $table->foreignId('TransactionId')->constrained('Transactions')->onUpdate('cascade')->onDelete('cascade'); 
});

Schema::table('transactions', function (Blueprint $table) {
     $table->foreignId('PersonId')->constrained('People')->onUpdate('cascade')->onDelete('cascade');
});