Question

我是编程新手。如何将自动生成应用于帐户表中的accountNo。我尝试了一切。但我不知道如何完成这项工作。任何人都可以解释我。

CREATE TABLE accounts(
    accountNo int(100) NOT NULL, // I need this to be auto generated.
    accountType VARCHAR(100) NOT NULL,
    firstName VARCHAR(50) NOT NULL,
    lastName VARCHAR(60) NOT NULL,
    birthdate DATE NOT NULL,
    gender VARCHAR(7),
    city VARCHAR(50) NOT NULL,
    street VARCHAR(50),
    cellPhone VARCHAR(10),
    CONSTRAINT PRIMARY KEY(accountNo)
);

Answer 1

试试这个。

CREATE TABLE accounts(
        accountNo int(100) NOT NULL AUTO_INCREMENT,
        accountType VARCHAR(100) NOT NULL,
        firstName VARCHAR(50) NOT NULL,
        lastName VARCHAR(60) NOT NULL,
        birthdate VARCHAR(20) NOT NULL,
        gender VARCHAR(7),
        city VARCHAR(50) NOT NULL,
        street VARCHAR(50),
        cellPhone VARCHAR(10),
        CONSTRAINT PRIMARY KEY(accountNo)
    );
        ALTER TABLE accounts AUTO_INCREMENT = 1001;

当您向accounts表格添加新数据时，accountNo将自动生成。

Answer 2

将其设为AUTO_INCREMENT：

private Queue<Point> queue = new LinkedList<Point>();
private int pickedColorInt = 0;

private void floodFill(Pixmap pixmap, int x, int y){
    //set to true for fields that have been checked
    boolean[][] painted  = new boolean[pixmap.getWidth()][pixmap.getHeight()];

    //skip black pixels when coloring
    int blackColor = Color.rgba8888(Color.BLACK);

    queue.clear();
    queue.add(new Point(x, y));

    while(!queue.isEmpty()){
        Point temp = queue.remove();
        int temp_x = temp.getX();
        int temp_y = temp.getY();

        //only do stuff if point is within pixmap's bounds
        if(temp_x >= 0 && temp_x < pixmap.getWidth() && temp_y >= 0 && temp_y < pixmap.getHeight()) {
            //color of current point
            int pixel = pixmap.getPixel(temp_x, temp_y);
            if (!painted[temp_x][temp_y] && pixel != blackColor) {
                painted[temp_x][temp_y] = true;
                pixmap.drawPixel(temp_x, temp_y, pickedColorInt);

                queue.add(new Point(temp_x + 1, temp_y));
                queue.add(new Point(temp_x - 1, temp_y));
                queue.add(new Point(temp_x, temp_y + 1));
                queue.add(new Point(temp_x, temp_y - 1));

            }
        }
    }
}

有关详细信息，请查看：https://dev.mysql.com/doc/refman/5.0/en/example-auto-increment.html

Answer 3

将它解析为AUTO_INCREMENT，您也可以像这样定义PRIMARY KEY。阅读手册auto_increment

from socketserver import TCPServer, ForkingTCPServer

帐号自动生成

3 个答案: