这是我的迁移:
public function up()
{
Schema::table('payments', function($table)
{
$table->dropColumn('invoice_id');
});
}
public function down()
{
Schema::table('payments',function (Blueprint $table){
$table->unsignedI
就在几分钟前,我刚刚提出了另一个问题,现在我又有了一个问题,我不知道这个问题哪里出了问题。
mysql> describe customers;
+-----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+----------------+
| id | in
这是剧本
ALTER TABLE `candycorn`.`bb_users`
ADD CONSTRAINT `pf_minecraftusername`
FOREIGN KEY (`pf_minecraftusername`)
REFERENCES `candycorn`.`bb_profile_fields_data` (`pf_minecraftusername`)
ON DELETE NO ACTION
ON UPDATE NO ACTION;
以及错误描述
ERROR 1452: Cannot add or update a
我正在为票证表添加一个外键。另一个表是ticket_statuses.
在artisan中,我执行了以下命令:php make:
这是迁移文件中的代码:
class AddTicketStatusToTicketsTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::table(&
在插入时遇到此错误,有什么解决方案吗?非常感谢。
Error Number: 1452
Cannot add or update a child row: a foreign key constraint fails (`2013evccor`.`tblregister`,
CONSTRAINT `fk_Register_tblMembers1` FOREIGN KEY (`intMemberID`) REFERENCES
`tblmembers` (`intMemberID`) ON DELETE NO ACTION ON UPDATE NO ACTION)
INSERT INT
我正尝试在教程表格中添加外键'USERNAME‘,但出现错误。
Executing:
ALTER TABLE `databse`.`tutorial`
ADD CONSTRAINT `USERNAME`
FOREIGN KEY (`USERNAME`)
REFERENCES `databse`.`register` (`USERNAME`)
ON DELETE CASCADE
ON UPDATE CASCADE;
Operation failed: There was an error while applying the SQL script to
我有两个表(cliente,usuario),当我尝试为cliente添加外键时,引用了表usuario,它导致错误1452
Table Cliente
id int primary key auto_increment
nome varchar(50) not null
telefone varchar(14)
email varchar(30)
id_usuario int not null
----------------------------------------