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[英]Hibernate - OneToMany UniDirectional Mapping - SQLGrammarException
[英]Hibernate OneToMany / ManyToOne results in SQLGrammarException
我在兩個表之間具有OneToMany
/ ManyToOne
關系。 表Partition
有一個外鍵,引用Event
的id
。 當我調用event.getPartitions()
應該返回一個包含所有Event
中所有Partitions
的列表時,出現以下異常:
Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet.
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax.
該dialect
設置為org.hibernate.dialect.MySQL5Dialect
, driver class
為com.mysql.jdbc.Driver
。
getPartitions:
@XmlTransient
@OneToMany(mappedBy = "event")
public Collection<Partition> getPartitions()
{
return partitions;
}
getEvent:
@XmlTransient
@ManyToOne
@JoinColumn(name = "event_id", referencedColumnName = "id", nullable = false)
public Event getEvent()
{
return event;
}
事件:
DROP TABLE IF EXISTS `event`;
CREATE TABLE `event` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`title` varchar(1024) NOT NULL,
`description` varchar(1024) DEFAULT NULL,
`img` varchar(1024) DEFAULT NULL,
`date` date DEFAULT NULL,
`location` varchar(1024) DEFAULT NULL,
`information` varchar(1024) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
划分:
DROP TABLE IF EXISTS `partition`;
CREATE TABLE `partition` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`event_id` int(11) NOT NULL,
`title` varchar(1024) DEFAULT NULL,
`description` varchar(1024) DEFAULT NULL,
`active_timestamp` datetime DEFAULT NULL,
`position` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `event_id` (`event_id`),
CONSTRAINT `event_partition` FOREIGN KEY (`event_id`) REFERENCES `event` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=15 DEFAULT CHARSET=utf8;
以下查詢被執行,對我來說也可以:
10:44:04,708 INFO [stdout] (default task-4) Hibernate: select event0_.id as id1_1_0_, event0_.date as date2_1_0_, event0_.description as descript3_1_0_, event0_.img as img4_1_0_, event0_.information as informat5_1_0_, event0_.location as location6_1_0_, event0_.title as title7_1_0_ from Event event0_ where event0_.id=?
10:44:04,818 INFO [stdout] (default task-4) Hibernate: select partitions0_.event_id as event_id6_1_0_, partitions0_.id as id1_2_0_, partitions0_.id as id1_2_1_, partitions0_.active_timestamp as active_t2_2_1_, partitions0_.description as descript3_2_1_, partitions0_.event_id as event_id6_2_1_, partitions0_.position as position4_2_1_, partitions0_.title as title5_2_1_ from Partition partitions0_ where partitions0_.event_id=?
Partition
是MySQL中的保留字 ,將表名更改為其他名稱(實體名可以保持不變,只需使用@Table
批注配置新表名)。
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