Question

我有3张桌子：

Employee(Employee_ID, First_Name, Last_Name)
Project(Project_ID, Project_Name)     
Task(Employee_ID, Project_ID, Assigned_Project_Task)

我想将Employee_ID Employee从Task插入Employee_ID=1 First_Name=ABC Last_Name=XYZ，当我将名字和姓氏分配给相应的ID时（例如Employee_ID）我首先给ABC名称和XYZ作为姓氏，1将放在Task表格的Project_ID字段中，Project从Task表到Assigned_Project_Task的内容相同表格，最后我需要在Task表的Project_ID=10, Project_Name=SomeProject in Project字段中为其命名。

EX。 Employee_ID = 1，First_Name = ABC，Last_Name =员工中的XYZ

first_name=ABC

如果我提供以下答案（在C＃的Windows窗体中）last_name=XYZ，project_name=SomeProject和task=NewTask并命名为Task。（我从windows窗体的txtbox中提供任务名称）

它会将Employee_ID=1, Project_ID=10, Assigned_Project_Name=NewTask表放入以下内容：

private void connectButtonActionPerformed(java.awt.event.ActionEvent evt) {                                              
        Socket socket = null;
        String ip;
        int port;
        String folder;

        ip = ipField.getText();
        port = (int) portField.getValue();
        folder = folderField.getText();

        try {
            File[] files = new File(folder).listFiles();
            System.out.println(files);
            socket = new Socket(InetAddress.getByName(ip), port);
            connectionStatus.setText("Connected");


        } catch (IOException ex) {
            Logger.getLogger(ConnectForm.class.getName()).log(Level.SEVERE, null, ex);
        }
    }

如何插入？

Answer 1

您插入的语句应该如下所示

INSERT INTO Task (Employee_ID, Project_Id, Assigned_Project_Name)
SELECT e.Employee_Id , p.Project_Id, 'NewTask'
FROM Employees e INNER JOIN Projects p 
WHERE e.last_name='XYZ' AND e.first_name='ABC' 
AND p.Project_Name='SomeProject';

您需要了解如何在C＃中构建此查询。

两个表中的SQL INSERT

1 个答案: