如何修剪@JoinColumn JPA中的键

Question

我需要帮助连接两个表。

下面是数据设置

private func setupConstraints(){

    //topView is a simple UIView with a red background for example purposes
    view.addSubview(topView)
    topView.translatesAutoresizingMaskIntoConstraints = false

    let cn1 = NSLayoutConstraint(item: topView, attribute: .leading, relatedBy: .equal, toItem: self.view, attribute: .leading, multiplier: 1.0, constant: 0)
    //Menu bar trailing end is 20 px from right edge of the screen
    let cn2 = NSLayoutConstraint(item: topView, attribute: .trailing, relatedBy: .equal, toItem: self.view, attribute: .trailing, multiplier: 1.0, constant: 0)
    //Menu bar height = constant 60
    let cn3 = NSLayoutConstraint(item: topView, attribute: .height, relatedBy: .equal, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 50)
    //Menu bar width greater than or equal to 400
    let cn4 = NSLayoutConstraint(item: topView, attribute: .width, relatedBy: .greaterThanOrEqual, toItem: nil, attribute: .notAnAttribute, multiplier: 1.0, constant: 400)
    //Menu bar vertical padding from the top edge of the screen = 20
    let cn5 = NSLayoutConstraint(item: topView, attribute: .top, relatedBy: .equal, toItem: self.view, attribute: .top, multiplier: 1.0, constant: 50)

    view.addConstraint(cn1)
    view.addConstraint(cn2)
    view.addConstraint(cn3)
    view.addConstraint(cn4)
    view.addConstraint(cn5)
}

因此可以对表2中的booking_id列的尾部空格进行裁剪，并可以与表1合并

我要实现的是这样：

Table 1 :

booking_id(PK) |  name
TTTxxxyy         passenger 1
TTTerwer         passenger 2

Table 2 : here the booking_id key has extra 3 trailing blank spaces
 with its values.( bcoz of the requirement) 

booking_id(PK) | amount
TTTxxxyy        50000
TTTerwer        70000