Question

我对此仍然很陌生，所以在我学习规则的同时要有耐心。我遇到了mysql脚本的问题，它给了我一个非常常见的1215错误（无法创建外键）

我已经检查了数据类型，并且外键引用主键，但它仍然无效。

The script. Issue is with the two final foreign keys

Answer 1

必须声明如下：

必须首先声明外键：

FOREIGN KEY

// foreignKEY-必须先声明为一列，然后再将其声明为[@好运。

Answer 2

您刚刚在引用的表和列的语法中犯了错误。

你写了例如：

    Public Sub Main()
    Dim sFile As String
    Dim i As Integer
    Dim bExists As Boolean

    i = 1
    bExists = True

    Dts.Variables("User::UStartTime").Value = Dts.Variables("System::StartTime").Value
    Dts.Variables("User::FileName").Value = Dts.Variables("User::Protocol").Value.ToString _
                                            & "_" & CStr(Format(Dts.Variables("User::UStartTime").Value, "yyyyMMdd")) _
                                            & "_" & CStr(i)

    Dts.Variables("User::FileLocation").Value = "\\ACMSHARES2\clntrial\DataMgt\" _
                                                & Dts.Variables("User::StudyNumber").Value.ToString _
                                                & "\" + Dts.Variables("User::FileLocation").Value.ToString _
                                                & Dts.Variables("User::FileName").Value.ToString _
                                                & "." & Dts.Variables("User::FileType").Value.ToString

    'Add incrementing number to end of file name per DMA
    Do Until bExists = False
        'SCRIPTING TASK FAILS ON THE NEXT LINE
        sFile = Dts.Variables("User::Filelocation").Value

        If File.Exists(sFile) Then
            i = i + 1
            Dts.Variables("User::FileName").Value = Dts.Variables("User::Protocol").Value.ToString _
                                            & "_" & CStr(Format(Dts.Variables("User::UStartTime").Value, "yyyyMMdd")) _
                                            & "_" & CStr(i)
            Dts.Variables("User::FileLocation").Value = "\\ACMSHARES2\clntrial\DataMgt\" _
                                                & Dts.Variables("User::StudyNumber").Value.ToString _
                                                & "\" + Dts.Variables("User::FileLocation").Value.ToString _
                                                & Dts.Variables("User::FileName").Value.ToString _
                                                & "." & Dts.Variables("User::FileType").Value.ToString
        Else
            bExists = False
        End If
        MsgBox("Loop iterated")
    Loop

    Dts.TaskResult = ScriptResults.Success
End Sub

应该是：

sFile = Dts.Variables("User::Filelocation").Value

语法记录在此处：

Answer 3

将REFERENCE key分配给PERCENTAGE表时出错。引用键应该是这样的。

FOREIGN KEY (RM_ID) REFERENCES ROOMMATE(RM_Id)
FOREIGN KEY (ITM_Id) REFERENCES ITEM(ITM_Id)

而不是：

FOREIGN KEY (RM_ID) REFERENCES ROOMMATE.RM_Id
FOREIGN KEY (ITM_Id) REFERENCES ITEM.ITM_Id

Answer 4

我注意到您尚未为主键/唯一约束指定名称，您也可以从外键中省略它们。此外，对于简单（单列）键，您可以将其声明为与列声明一致，例如：剪断示例：

CREATE TABLE ITEM ( ITM_ID INT(3) NOT NULL UNIQUE );

CREATE TABLE PERCENTAGE ( ITM_ID INT(3) NOT NULL REFERENCES ITEM ( ITM_ID ) );

错误1215外键约束

4 个答案: