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pzwm
 Post subject: How to escape keywords with JPA
PostPosted: Thu Mar 16, 2017 11:54 pm 
Newbie

Joined: Thu Mar 16, 2017 11:46 pm
Posts: 4
im use hibernate and MySQL,when i use 'describe' as column name.my code return:

org.hibernate.exception.SQLGrammarException: could not execute statement

java.sql.SQLSyntaxErrorException: 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 'describe='for test', islocked=0, permission_code='add,edit', role_name='test_rol' at line 1
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vlad
 Post subject: Re: how to avoid some word can lead Exception
PostPosted: Fri Mar 17, 2017 2:15 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
You need to escape your column name as follows:

Code:
@Column(name ="\"describe"\")
private String describe;


For more details, check out this article.
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pzwm
 Post subject: Re: how to avoid some word can lead Exception
PostPosted: Fri Mar 17, 2017 2:23 am 
Newbie

Joined: Thu Mar 16, 2017 11:46 pm
Posts: 4
vlad wrote:
You need to escape your column name as follows:

Code:
@Column(name ="\"describe"\")
private String describe;



thanks
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pzwm
 Post subject: Re: how to avoid some word can lead Exception
PostPosted: Tue Aug 22, 2017 5:00 am 
Newbie

Joined: Thu Mar 16, 2017 11:46 pm
Posts: 4
vlad wrote:
You need to escape your column name as follows:

Code:
@Column(name ="\"describe"\")
private String describe;


sorry,i did not test this method just remember it.But i encountered the same problem.then i try add \" like this name ="\"describe\"".it is invalid.

@Basic
@Column(name = "\"describe\"")
public String getDescribe() {
return describe;
}

public void setDescribe(String describe) {
this.describe = describe;
}

if you find the cause for my code. tell me please!thanks a lot!
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vlad
 Post subject: Re: How to escape keywords with JPA
PostPosted: Wed Aug 23, 2017 5:24 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
Not only that it works, but it works like charm. Check out this test case on GitHub and run it yourself if you don't believe me.

Code:
@Entity(name = "Table")
@javax.persistence.Table(name = "\"table\"")
public static class Table {

   @Id
   private Long id;

   @Column(name = "\"number\"")
   private Integer number;

   @Column(name = "\"from\"")
   private String from;

   @Column(name = "\"select\"")
   private String select;
}


And why wouldn't it work? Its' standard JPA:

Quote:
Using annotations, a name is specified as a delimited identifier by enclosing the name
within double quotes, whereby the inner quotes are escaped, e.g.,
@Table(name="\"customer\"").
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pzwm
 Post subject: Re: How to escape keywords with JPA
PostPosted: Wed Aug 23, 2017 5:45 am 
Newbie

Joined: Thu Mar 16, 2017 11:46 pm
Posts: 4
vlad wrote:
Not only that it works, but it works like charm. Check out this test case on GitHub and run it yourself if you don't believe me.

Code:
@Entity(name = "Table")
@javax.persistence.Table(name = "\"table\"")
public static class Table {

   @Id
   private Long id;

   @Column(name = "\"number\"")
   private Integer number;

   @Column(name = "\"from\"")
   private String from;

   @Column(name = "\"select\"")
   private String select;
}


And why wouldn't it work? Its' standard JPA:

Quote:
Using annotations, a name is specified as a delimited identifier by enclosing the name
within double quotes, whereby the inner quotes are escaped, e.g.,
@Table(name="\"customer\"").


i use intellij idea persistence generate persistence mapping.
Code:
@Basic
    @Column(name = "process_describe")
    public String getProcessDescribe() {
        return processDescribe;
    }

    public void setProcessDescribe(String processDescribe) {
        this.processDescribe = processDescribe;
    }

if i use 'describe' named my column.it will error.And i can't resolve it used \". but i just rename 'process_describe'.it will success without '\"'. i think trouble is in 'describe'. Probably the problem is beyond my understanding of hibernate.I will record this problem until I can solve him.Later I will go to reading your code on github.Thank you for your reply
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vlad
 Post subject: Re: How to escape keywords with JPA
PostPosted: Wed Aug 23, 2017 5:56 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
I tested it using Hibernate 5.2.10. Maybe you are running an older version which didn't support the JPA escape syntax, in which case you can use the Hibernate one using the ` character:

@Column(name ="`describe`")
private String describe;

or you can set the global escape behavior:

Code:
<property name="hibernate.globally_quoted_identifiers">true</property>
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