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JPA: how do I persist a String into a database field, type MYSQL Text

Posted by: admin November 1, 2017 Leave a comment


The requirement is that the user can write an article, therefore I choose type Text for the content field inside mysql database. How can I convert Java String into MySQL Text

Here you go Jim Tough

public class Article implements Serializable {
    private static final long serialVersionUID = 1L;
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    private Long userId;

    private String title;

    private String content;

    private Integer vote;

    //Constructors, setters, getters, equals and hashcode

In my MYSQL database, content is type Text. I was hoping that there would be something like this java.sql.Text, since java.sql.Blob is an actual type, but sadly, that does not exist


Since you’re using JPA, use the Lob annotation (and optionally the Column annotation). Here is what the JPA specification says about it:

9.1.19 Lob Annotation

A Lob annotation specifies that a
persistent property or field should be
persisted as a large object to a
database-supported large object type.
Portable applications should use the
Lob annotation when map- ping to a
database Lob type. The Lob annotation
may be used in conjunction with the
Basic annotation. A Lob may be
either a binary or character type. The
Lob type is inferred from the type of
the persistent field or property, and
except for string and character-based
types defaults to Blob.

So declare something like this:

@Column(name="CONTENT", length=512)
private String content;


  • JPA 1.0 specification:
    • Section 9.1.19 “Lob Annotation”

With @Lob I always end up with a LONGTEXTin MySQL.

To get TEXT I declare it that way (JPA 2.0):

@Column(columnDefinition = "TEXT")
private String text

Find this better, because I can directly choose which Text-Type the column will have in database.

For columnDefinition it is also good to read this.

EDIT: Please pay attention to Adam Siemions comment and check the database engine you are using, before applying columnDefinition = "TEXT".


for mysql ‘text’:

@Column(columnDefinition = "TEXT")
private String description;

for mysql ‘longtext’:

private String description;