我试图在表中插入一行,该表有3个外键。为了获得这些钥匙我有独特的" filds搜索。
SQL
create table user(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(30) NOT NULL,
username VARCHAR(50) NOT NULL,
password VARCHAR(30) NOT NULL,
access_token VARCHAR(32),
reg_date TIMESTAMP,
UNIQUE(username),
UNIQUE(access_token)
);
create table pharmacy(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
places_id VARCHAR(50) NOT NULL,
name VARCHAR(30) NOT NULL,
coord VARCHAR(50) NOT NULL,
description VARCHAR(100),
reg_date TIMESTAMP,
UNIQUE(places_id)
);
create table item(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
name VARCHAR(30) NOT NULL,
description VARCHAR(100),
reg_date TIMESTAMP,
UNIQUE(name)
);
create table item_bought(
id INT(6) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
id_user INT(6) UNSIGNED,
id_pharmacy INT(6) UNSIGNED,
id_item INT(6) UNSIGNED,
price float(6,2) NOT NULL,
bought_date date,
reg_date TIMESTAMP,
foreign key(id_user)
references user(id),
foreign key(id_pharmacy)
references pharmacy(id),
foreign key(id_item)
references item(id)
);
我在JAVA中构建的查询:
INSERT INTO item_bought (id_user, id_pharmacy, id_item, price, bought_date)
SELECT user.id, pharmacy.id, item.id, 12.32, date('1999-02-24')
FROM user, pharmacy, item
WHERE ( SELECT user.id, user.username, pharmacy.id,
pharmacy.places_id, item.id, item.name
FROM item, pharmacy, item
WHERE user.username='jhon', pharmacy.places_id='id1', item.name='ibuprufen' )
这是我得到的错误:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Not unique table/alias: 'item'
感谢您的帮助:D
解决方案
根据Gordon Linoff的回答:
INSERT INTO item_bought (id_user, id_pharmacy, id_item, price, bought_date)
SELECT (SELECT u.id FROM user u WHERE u.username = 'jhon'),
(SELECT p.id FROM pharmacy p WHERE p.places_id = 'id1'),
(SELECT i.id FROM item i WHERE i.name='ibuprufen'),
(SELECT 13.22), (SELECT date('1999-02-12'));
更优雅!
答案 0 :(得分:1)
问题似乎是这一行:
FROM item, pharmacy, item
你有item
两次。尝试删除一个。
答案 1 :(得分:1)
在您的代码中,您在同一查询中对同一个表调用两次。这是错误的。它应该是:
INSERT INTO item_bought (id_user, id_pharmacy, id_item, price, bought_date)
SELECT user.id, pharmacy.id, item.id, 12.32, date('1999-02-24')
FROM user, pharmacy, item
WHERE ( SELECT user.id, user.username, pharmacy.id,
pharmacy.places_id, item.id, item.name
FROM item, pharmacy
WHERE user.username='jhon', pharmacy.places_id='id1', item.name='ibuprufen' )
答案 2 :(得分:1)
我认为您想要的查询是:
INSERT INTO item_bought (id_user, id_pharmacy, id_item, price, bought_date)
SELECT (SELECT u.id FROM user u WHERE u.username = 'jhon'),
(SELECT p.id FROM pharmacy p WHERE p.places_id = 'id1'),
(SELECT i.id FROM item i WHERE i.name='ibuprufen');
您的查询有很多错误 - 相同的表在from中没有表别名,where
子句中的逗号,标量上下文中的select
返回多列和(可能)多行而不是一行。另外,在where
子句中使用逗号是非常糟糕的做法。