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[英]org.postgresql.util.PSQLException: ERROR: column user0_.id does not exist - Hibernate
[英]org.postgresql.util.PSQLException: Error: column systementi0_.id does not exist - Hibernate, PostgreSql
我收到錯誤“列“systementi0_.Id 不存在”。我正在使用 PostgreSql 和 Hibernate。我的實體有代碼:
@Entity
@Table(name = "system_table", schema = "blue_schema")
public class SystemEntity {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "Id", unique = true)
private int id;
@Column(name = "name")
private String name;
@Column(name = "sys_description")
private String systemDescription;
@Column(name = "tech_description")
private String technologyDescritpion;
@Column(name = "owner_name")
private String owner;
public SystemEntity() {
// TODO Auto-generated constructor stub
}
public SystemEntity(int id, String name, String systemDescription, String technologyDescritpion, String owner) {
super();
this.id = id;
this.name = name;
this.systemDescription = systemDescription;
this.technologyDescritpion = technologyDescritpion;
this.owner = owner;
}
public SystemEntity(String name, String systemDescription, String technologyDescritpion, String owner) {
super();
this.name = name;
this.systemDescription = systemDescription;
this.technologyDescritpion = technologyDescritpion;
this.owner = owner;
}
在開始時,我試圖從數據庫中獲取該表中的所有數據。
@Override
public List<SystemEntity> getAllSystems() {
Session currentSession = sessionFactory.getCurrentSession();
Query<SystemEntity> theQuery = currentSession.createQuery("from SystemEntity", SystemEntity.class);
List<SystemEntity> listOfSystems = theQuery.getResultList();
return listOfSystems;
}
那是我的數據庫類型和 output:表 output
我的模式名稱在 @Table 注釋中得到了澄清,但仍然出現錯誤:
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/ContractManager] threw exception [Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet] with root cause
org.postgresql.util.PSQLException: Error: columnsystementi0_.id does not exist.
我看到了類似的帖子,但解決方案很簡單,只需在 @Table 中添加模式名稱。
也許你應該使用Integer
,數據類型而不是int
,你應該嘗試直接使用表名。 system_table
這是一個常見的錯誤。 第一個建議:不要在所有數據庫實體的名稱中使用大寫:模式、表或列。 您的id
列名稱具有“ Id ”。 試試“ id ”。 第二:我推薦你在postresql中使用序列生成器:
@Entity
@Table(name = "system_table", schema = "blue_schema")
@SequenceGenerator(schema = "blue_schema", name = "system_table_seq", allocationSize = 1, sequenceName = "system_table_seq")
public class SystemEntity {
// other code below
// ...
}
最后一個建議:不要在 JPA 實體中使用原始類型。 嘗試:
@Entity
@Table(name = "system_table", schema = "blue_schema")
@SequenceGenerator(schema = "blue_schema", name = "system_table_seq", allocationSize = 1, sequenceName = "system_table_seq")
public class SystemEntity {
@Id
@GeneratedValue(generator = "system_table_seq", strategy = GenerationType.SEQUENCE)
private Integer id;
// other code below
// ...
}
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