Question

我正在尝试创建以下表格设计，但我在下面收到此错误如何为stops表格中的arrivaltimes表设置外键？

1064 - 您的SQL语法出错;检查与MySQL服务器版本对应的手册，以便在第4行的“FOREIGN KEY REFERENCES stop（stop_id）”附近使用正确的语法

stt.execute("CREATE TABLE IF NOT EXISTS stops"
        + "(stop_id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, "
        + " name varchar(30) NOT NULL, " + " route INT(11) NOT NULL, "
        + " lat double(10,6) NOT NULL, "
        + " longi double(10,6)NOT NULL) ");

stt.execute("CREATE TABLE IF NOT EXISTS arrivaltimes(id INT(11) NOT NULL PRIMARY KEY,"
        + " weekday VARCHAR(20) NOT NULL,"
        + "arrivaltime time NOT NULL,"
        + " stop_id INT FOREIGN KEY REFERENCES stops(stop_id) )" );

Answer 1

更改

stop_id INT FOREIGN KEY REFERENCES stops(stop_id)

到

stop_id INT, FOREIGN KEY fk_stop_id(stop_id) REFERENCES stops(stop_id)

Answer 2

我已更新了查询，请注意FOREIGN KEY的语法，其中包含错误。干杯！

stt.execute("CREATE TABLE IF NOT EXISTS stops"
        + "(stop_id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY, "
        + " name varchar(30) NOT NULL, " + " route INT(11) NOT NULL, "
        + " lat double(10,6) NOT NULL, "
        + " longi double(10,6)NOT NULL) ");



stt.execute("CREATE TABLE IF NOT EXISTS arrivaltimes(id INT(11) NOT NULL PRIMARY KEY,"
                            + " weekday VARCHAR(20) NOT NULL,"
                            + "arrivaltime time NOT NULL,"
                            + " FOREIGN KEY (stop_id) REFERENCES stops(stop_id) )" );

Answer 3

如果查看MySQL CREATE TABLE syntax，您可以选择：

内联定义（注意缺少FOREIGN KEY）

stop_id INT REFERENCES stops(stop_id)

和明确的定义：

stop_id INT,
FOREIGN KEY (stop_id) REFERENCES stops(stop_id)

或更好（带有命名约束）：

stop_id INT,
CONSTRAINT fk_arrivaltimes_stops FOREIGN KEY (stop_id) REFERENCES stops(stop_id)

创建外键时出现语法错误

3 个答案: