联合主键(Composite Primary Key)是由多个列共同组成的主键,用于唯一标识数据库表中的每一行记录。与单一主键不同,联合主键涉及两个或更多列的组合,确保这些列的组合在整个表中是唯一的。 2. 在Laravel中如何设置联合主键? 在Laravel中设置联合主键可以通过数据库迁移(Migration)来完成。首先,你需要在迁移文件
分类:自定义主键可以分为单一主键(Single Primary Key)和复合主键(Composite Primary Key)。单一主键只有一个字段作为主键,而复合主键则由多个字段组成。 优势:使用自定义主键可以提供更灵活的数据关联和查询方式。同时,自定义主键可以使数据更符合业务需求,并且在特定情况下可以提升性能。
laravel默认主键是id,但有的时候我们建表时可能会需要用到复合主键,那么laravel中使用Eloquent Medel如何定义复合主键呢?直接上代码。 首先在app目录先创建文件 Traits/HasCompositePrimaryKey 内容如下: //Adjust this to match your model namespace!namespace App\Traits;useIlluminate\Database\Eloquent\Builder; trai...
$table->primary('id');加入主键 (primary key) $table->primary(array('first','last'));加入复合键 (composite keys) $table->unique('email');加入唯一索引 (unique index) $table->index('state');加入基本索引 (index) 外键 Laravel 也支持数据表的外键约束: ...
命令功能描述 $table->primary('id'); 加入主键 (primary key) $table->primary(array('first', 'last')); 加入复合键 (composite keys) $table->unique('email'); 加入唯一索引 (unique index) $table->index('state'); 加入基本索引 (index)...
Eloquent requires each model to have at least one uniquely identifying "ID" that can serve as its primary key. "Composite" primary keys are not supported by Eloquent models. However, you are free to add additional multi-column, unique indexes to your database tables in addition to the table...
Eloquent requires each model to have at least one uniquely identifying "ID" that can serve as its primary key. "Composite" primary keys are not supported by Eloquent models. However, you are free to add additional multi-column, unique indexes to your database tables in addition to the table...
"Composite" primary keys are not supported by Eloquent models. However, you are free to add additional multi-column, unique indexes to your database tables in addition to the table's uniquely identifying primary key.UUID & ULID KeysInstead of using auto-incrementing integers as your Eloquent ...
1<?php 2 3class Flight extends Model 4{ 5 /** 6 * The data type of the primary key ID. 7 * 8 * @var string 9 */ 10 protected $keyType = 'string'; 11}"Composite" Primary KeysEloquent requires each model to have at least one uniquely identifying "ID" that can serve as its...
$table->primary('id');加入主鍵 (primary key) $table->primary(['first','last']);加入複合鍵 (composite keys) $table->unique('email');加入唯一索引 (unique index) $table->index('state');加入基本索引 (index) 外鍵 Laravel 也支援資料表的外鍵約束: ...