->after('column')将此字段放置在其它字段「之后」(仅限 MySQL) ->comment('my comment')增加注释 ->default($value)为此字段指定「默认」值 ->first()将此字段放置在数据表的「首位」(仅限 MySQL) ->nullable()此字段允许写入 NULL 值 ->storedAs($expression)创建一个存储的生成字段 (仅限 MySQL) ...
$table->string('name', 50)->nullable()->change(); }); 字段改名 To rename a column, you may use therenameColumnmethod on the Schema builder. Before renaming a column, be sure to add thedoctrine/dbaldependency to yourcomposer.jsonfile: 要重命名一个字段,在Schema构建器里,你可以使用 rename...
当然还可以对字段的默认值约束进行修改：$table->string('deleted_at')->nullable()->change();对于插入新的字段，还可以指定位于哪个字段之前或者之后：$table->string('email')->nullable()->after('last_name');仅仅修改字段名，只需调用对应方法：$table->renameColumn('promoted', 'is_promoted');或者在...
Specifying A Custom Column Name1'state' => 'exists:states,abbreviation'Occasionally, you may need to specify a specific database connection to be used for the exists query. You can accomplish this by prepending the connection name to the table name using "dot" syntax:1'email' => 'exists:...
Schema::table('articles',function(Blueprint$table) {$table->dropColumn('description'); }); } 修改字段: publicfunctionup() { Schema::table('articles',function(Blueprint$table) {$table->string('description', 200)->change(); });
$table->dropColumn('description'); }); } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 修改字段: public function up() { Schema::table('articles', function (Blueprint $table) { $table->string('description', 200)->change(); ...
exists:table,columnThe field under validation must exist in a given database table.Basic Usage Of Exists Rule1'state' => 'exists:states'If the column option is not specified, the field name will be used. So, in this case, the rule will validate that the states database table contains ...
别担心laravel还有个->nullable()我们这里学习了最常用的int 、 varchar 、 text那更多的类型呢?这时候就是laravel官方手册真正的作用了,laravel官方手册更适合作为一本工具书,我们去像查字典一样去查工具书就可以了。 修改字段 创建表的方式我们已经学会了,除了创建表,我们还经常需要改变表结构,默认的users并没有...
This change requires the addition of a newremember_tokencolumn to yourusers(or equivalent) database table. After this change, a fresh token will be assigned to the user each time they login to your application. The token will also be refreshed when the user logs out of the application. The...
$table->string('name', 50)->nullable()->change(); }); 1. 2. 3. 1 2 3 重命名列 要重命名一个列,可以使用表结构构建器上的renameColumn方法,在重命名一个列之前,确保doctrine/dbal依赖已经添加到composer.json文件: Schema::table('users', function ($table) { ...