Question

我有两个表，如User和Roles。我想在Table Users上添加外部Roles_id。

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('NIK',16);
        $table->string('nama');
        $table->string('email')->unique();
        $table->string('username');
        $table->string('password');
        $table->unsignedBigInteger('roles_id')->default(1);

        $table->timestamps();
        $table->softDeletes();

        $table->foreign('roles_id')->references('id')->on('roles');
    });
}

和我的角色表

 public function up()
{
    Schema::create('roles', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('roles');
        $table->timestamps();
    });
}

我没有捕获未命中的代码，我使用 unsignedBigInteger ，仍然出错。我正在使用->可为空。但是没有工作。可以找到这个错误吗？

编辑。此错误：

SQLSTATE [HY000]：常规错误：1215无法添加外键约束（SQL：更改表users添加约束users_roles_id_foreign外键（roles_id）引用roles（ id）

Answer 1

首先，创建角色表：

for i in range(3,len(df1)):
#str(df1['VARIABLE'][i].contains('^\d'))
    if (df1['VARIABLE'][i].astype(str).contains('^\d') == True):

然后创建一个用户表：

txtSearchFor = textbox
lstresult = listbox

Seng Piseth, [30.05.19 10:57]
Option Compare Database

Public Function kh(ByVal st As String) As String
    Dim x As String
    Dim i As Integer
    For i = 1 To Len(st)
        x = x & AscW(Mid(st, i, 1))
    Next
    kh = x
End Function

Private Sub txtSearchFor_KeyUp(KeyCode As Integer, Shift As Integer)
    Dim rs As New ADODB.Recordset
    Dim cnn As New ADODB.Connection
    With rs
        .CursorLocation = adUseClient
        .CursorType = adOpenStatic
        .LockType = adLockReadOnly
        .Open "SELECT * FROM tbentryletter WHERE kh(let_name) LIKE '%" & kh(Me.txtSearchFor.Text) & "%'", cnn
        Set Me.lstresult.Recordset = rs
        .Close
    End With

End Sub

用于放置外键：

 public function up(){
    Schema::create('roles', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string('roles');
        $table->timestamps();
    });
}

无法在新表Laravel 5.8上添加外键

1 个答案: