[英]java.sql.SQLException: Field 'id' doesn't have a default value
我正在嘗試將數據插入到arrivaltimes
時間表中,但出現以下錯誤:
java.sql.SQLException:字段“id”沒有默認值
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("INSERT INTO stops(name, route, lat, longi) values"
+ "('blabla', '1', '93.838039', '15.700440' ),"
+ "('backery', '9', '98.868863', '19.665438' )" );
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 fk_stop_id(stop_id) REFERENCES stops(stop_id) )" );
//The error appears in this execution statement.
stt.execute("INSERT INTO arrivaltimes(weekday, arrivaltime) values"
+ "('mon-fri', '05:30' ),"
+ "('mon-fri', '06:07' )" );
您在到達時間表中缺少主鍵的AUTO INCREMENT
。 只需要在創建表時添加AUTO_INCREMENT
stt.execute("CREATE TABLE IF NOT EXISTS arrivaltimes(id INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY,"
+ " weekday VARCHAR(20) NOT NULL,"
+ "arrivaltime time NOT NULL,"
+ " stop_id INT, FOREIGN KEY fk_stop_id(stop_id) REFERENCES stops(stop_id) )" );
因為列id
被定義為NOT NULL
,這意味着它必須有一個值,而您沒有提供一個值。
我在 MySQL WorkBench 中的表遇到了同樣的問題。 很明顯,自動增量命令給字段“id”一個默認值。 這是適用於我的表的代碼:
create table product( <br>
id int auto_increment PRIMARY KEY, <br>
name varchar(20), <br>
description varchar(100), <br>
price decimal(8,3) <br>
);
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