JPA之映射mysql text类型的问题

@Data
@Entity
@Table(name="question")
public class Question {
    @Id
    @GeneratedValue
    public int questionId;
    //....省略其他字段
    @Lob
    @Column(columnDefinition="text")
    public String explainStr;
    public Date createTime;
}

private Date birthday;
@Temporal(TemporalType.DATE)
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}

public enum Gender
  {
Male,Female
}

private Gender gender = Gender.Male;  // 为枚举设置默认值
@Enumerated(EnumType.STRING)
public Gender getGender() {
return gender;
}
public void setGender(Gender gender) {
this.gender = gender;
}

private String diary;
@Lob
public String getDiary() {
return diary;
}
public void setDiary(String diary) {
this.diary = diary;
}

private Byte[] file;
@Lob
public Byte[] getFile() {
return file;
}
public void setFile(Byte[] file) {
this.file = file;
}

private String other;
@Transient
public String getOther() {
return other;
}
public void setOther(String other) {
this.other = other;
}

private Byte[] file;
@Lob @Basic(fetch=FetchType.LAZY)
public Byte[] getFile() {
return file;
}
public void setFile(Byte[] file) {
this.file = file;
}