I am working on a Spring mvc web application in which I need to create a town using Hibernate. Following is my town model.
@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;
}
I have another entity named district. Town is a part of district and a district can have multiple towns. Following is my district model:
@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;
}
I am using following Hibernate code for saving town:
Session session = sessionFactory.getCurrentSession();
session.save(townModel);
But it shows error:
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
During application update an error message containing "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 ..." appears in the log. It means your database is outdated and it can't work with the request our application sends to it.
The error messages states:
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
The problem is in the generated query, due to the usage of desc
since it's a reserved word in MySQL.
Possible solutions:
description
. Do similar with name
.Change the name of the column in the fields to append ` character (referenced from Creating field with reserved word name with JPA):
@Column(name="`desc`")
IMO while option 3 is a quick and dirty solution, I find option 1 as the best solution for future usage of the database.
You can also use square brackets or double quotes to escape column name.
@Column(name="[desc]")
private String townDesc;
or
@Column(name="\"desc\"")
private String townDesc;
desc
is a mysql reserve word.Check
Solution:
Do
@Column(name="[desc]")
^ ^
Add square brackets [] .
OR
Change the name of column
Source
I had the same problem but I'd named one of my columns 'order'. Of course, this is also a reserved word. Easy mistake to make.
I add a table named 'order' in MySQL Workbench, it doesn't give me an error.
But when I execute the query by Spring JPA
It gives out the error.
That's because my table name "order" is a reserved word.
Just make a little change and the error has gone.
change table name from "order" to "orders"
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