这些是我的表:
create table sender(
sno varchar(6) not null,
sfname varchar(15) not null,
slname varchar(10) not null,
sphone varchar(10),
saddress varchar(40) not null,
constraint pk_sender primary key(sno)
);
create table courier(
cno varchar(6),
cost double precision not null,
weight double precision not null,
del_stat varchar(20) not null,
no_cour int(10),
sno varchar(6),
constraint fk_courier foreign key(sno)
references sender(sno),constraint pk_courier primary key(cno)
);
这是我的 php 代码:
<?php
session_start();
$_SESSION['x']=$_POST[sno];
$con=mysqli_connect("localhost","root","project123","project");
// Check connection
if (mysqli_connect_errno())
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
$sql1="insert into sender(sno,sfname,slname,sphone,saddress) values (concat('SN','$_POST[sno]'),'$_POST[sf]','$_POST[sl]','$_POST[sph]','$_POST[sad]')";
$sql2="insert into courier(cno,cost,weight,del_stat,no_cour) values (concat('CN','$_POST[cno]'),'$_POST[cst]','$_POST[wght]','$_POST[del]','$_POST[num]')";
if(!mysqli_query($con,$sql1) && !mysqli_query($con,$sql2))
{
die('Error: ' . mysqli_error($con));
}
mysqli_close($con);
?>
但我收到错误错误:无法添加或更新子行:外键约束失败(project
. courier
, CONSTRAINT fk_courier
FOREIGN KEY ( sno
) REFERENCES sender
( sno
))
所以请告诉我如何将值插入外键。