我正在开发一个 Spring mvc web 应用程序,我需要在其中使用 Hibernate 创建一个城镇。以下是我的城镇模型。
@Entity
@Table(name="town")
public class TownModel {
@Id
@Column(name="townid")
@GeneratedValue
private Integer townId;
@Column(name="name")
private String townName;
@Column(name="desc")
private String townDesc;
@ManyToOne(optional = true)
@JoinColumn(name="districtid")
private DistrictModel districtModel;
}
我有另一个名为 district 的实体。城镇是地区的一部分,一个地区可以有多个城镇。以下是我的地区模型:
@Entity
@Table(name="district")
public class DistrictModel {
@Id
@Column(name="districtid")
@GeneratedValue
private Integer districtId;
@Column(name="name")
private String name;
@Column(name="desc")
private String description;
@OneToMany(mappedBy = "districtModel", fetch = FetchType.EAGER)
@Fetch(value = FetchMode.SUBSELECT)
private List<TownModel> townModelList;
}
我正在使用以下 Hibernate 代码来拯救城镇:
Session session = sessionFactory.getCurrentSession();
session.save(townModel);
但是显示错误:
21:22:08,104 WARN [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http--127.0.0.1-9090-1) SQL Error: 1064, SQLState: 42000
21:22:08,112 ERROR [org.hibernate.engine.jdbc.spi.SqlExceptionHelper] (http--127.0.0.1-9090-1) 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 'desc, name) values (2, 'Test town desc.', 'Test town')' at line 1
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: 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 'desc, name) values (2, 'Test town desc.', 'Test town')' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.7.0_45]
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57) ~[na:1.7.0_45]
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.7.0_45]
at java.lang.reflect.Constructor.newInstance(Constructor.java:526) ~[na:1.7.0_45]
at com.mysql.jdbc.Util.handleNewInstance(Util.java:377) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.Util.getInstance(Util.java:360) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:978) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3887) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3823) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2435) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2582) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2530) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1907) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2141) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2077) ~[com.mysql.jdbc_5.1.5.jar:na]
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:2062) ~[com.mysql.jdbc_5.1.5.jar:na]
at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeUpdate(WrappedPreparedStatement.java:493) ~[na:na]
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.executeUpdate(ResultSetReturnImpl.java:186) ~[hibernate-core-4.2.16.Final.jar:4.2.16.Final]
... 64 common frames omitted
最佳答案
错误消息指出:
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 'desc, name) values (2, 'Test town desc.', 'Test town')' at line 1
问题出在生成的查询中,因为使用了 desc
,因为它是 MySQL 中的保留字。
可能的解决方案:
- 将您的列名称更改为
description
。对name
做类似的事情。 - 更改 MySQL 中的配置以支持查询中列的此类名称。
更改字段中列的名称以附加 ` 字符(引用自 Creating field with reserved word name with JPA ):
@Column(name="`desc`")
IMO 虽然选项 3 是一个快速而肮脏的解决方案,但我发现选项 1 是 future 使用数据库的最佳解决方案。
关于java - SQL 错误 : 1064, SQLState:创建新实体时为 42000,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28946567/