[英]Unable to create a table in hibernate using OneToMany and ManyToOne relationship(also unable to create Foreign Key)
[英]Hibernate: Unable to query a database table using a Foreign Key
我正在嘗試點燃以下 Hibernare 采石場。
Query query = session.createSQLQuery("from Rating as rating where rating.organization.idorganization = :idorganization");
我總是以錯誤告終
hibernate.engine.jdbc.spi.SqlExceptionHelper.logExceptions You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from Rating as rating where rating.organization.idorganization = 65' at line 1
org.hibernate.exception.SQLGrammarException: could not extract ResultSet
下面是我的Rating
豆
public class Rating implements java.io.Serializable {
private Integer idrating;
private Organization organization;
private User user;
private double rating;
private Date dateCreated;
private Date lastUpdated;
public Rating() {
}
public Rating(Organization organization, User user, double rating) {
this.organization = organization;
this.user = user;
this.rating = rating;
}
public Rating(Organization organization, User user, double rating, Date dateCreated, Date lastUpdated) {
this.organization = organization;
this.user = user;
this.rating = rating;
this.dateCreated = dateCreated;
this.lastUpdated = lastUpdated;
}
public Integer getIdrating() {
return this.idrating;
}
public void setIdrating(Integer idrating) {
this.idrating = idrating;
}
public Organization getOrganization() {
return this.organization;
}
public void setOrganization(Organization organization) {
this.organization = organization;
}
public User getUser() {
return this.user;
}
public void setUser(User user) {
this.user = user;
}
public double getRating() {
return this.rating;
}
public void setRating(double rating) {
this.rating = rating;
}
public Date getDateCreated() {
return this.dateCreated;
}
public void setDateCreated(Date dateCreated) {
this.dateCreated = dateCreated;
}
public Date getLastUpdated() {
return this.lastUpdated;
}
public void setLastUpdated(Date lastUpdated) {
this.lastUpdated = lastUpdated;
}
}
下面是Rating.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<!-- Generated Sep 19, 2020 8:15:23 PM by Hibernate Tools 4.3.1 -->
<hibernate-mapping>
<class name="beans.Rating" table="rating" catalog="autocircle" optimistic-lock="version">
<id name="idrating" type="java.lang.Integer">
<column name="idrating" />
<generator class="identity" />
</id>
<many-to-one name="organization" class="beans.Organization" fetch="select">
<column name="idorganization" not-null="true" />
</many-to-one>
<many-to-one name="user" class="beans.User" fetch="select">
<column name="iduser" not-null="true" />
</many-to-one>
<property name="rating" type="double">
<column name="rating" precision="22" scale="0" not-null="true" />
</property>
<property name="dateCreated" type="timestamp">
<column name="date_created" length="0" />
</property>
<property name="lastUpdated" type="timestamp">
<column name="last_updated" length="0" />
</property>
</class>
</hibernate-mapping>
為什么我收到這個錯誤?
由於您使用的是 createSQLQuery 方法,因此應該使用 SQL 語句。 在這種情況下,應該是
“從評級中選擇 * 作為評級,其中 rating.organization.idorganization = :idorganization”
或者使用 HQL 方法和適當的 HQL 查詢
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