带有 Java 的 Hibernate 和 Postgresql 9.0

Question

我有一个应用程序，它使用使用 hibernat 创建的实体收集它的一些数据，其余的通过简单的 jdbc 数据库连接和 sql 语句收集。储蓄也是一样。我最近将数据库从 Postgresql 8.4 升级到 Postgresql 9.0，并注意到使用实体收集的所有数据不再显示。我可以与实体一起保存数据，但不能显示相同的数据。

我升级到 Hibernate 3.6.2 没有修复，我还从 postgresql 9.0-801 更新到最新的 JDBC3 驱动程序。这些都没有解决问题。

这里是其中一个有效的实体。数据库升级后我没有改变。

package com.ajrs.entities;

import java.io.Serializable;
import javax.persistence.*;  
import static javax.persistence.GenerationType.*;

@Entity
@Table(name="lk_note_category")
@NamedQueries({
@NamedQuery(
name="LkNoteCategory.getAll",
        query="SELECT l FROM LkNoteCategory l"
        )
})

public class LkNoteCategory implements Serializable {

@Id
private String category;    
private String description;
private boolean default_category;    

public String getCategory() {
    return category;
}

public void setCategory(String category) {
    this.category = category;
}

public String getDescription() {
    return description;
}

public void setDescription(String description) {
    this.description = description;
}

public boolean isDefault_category() {
    return default_category;
}

public void setDefault_category(boolean default_category) {
    this.default_category = default_category;
}

}

所以我使用以下内容创建笔记类别对象：

noteCategories = em.createNamedQuery("LkNoteCategory.getAll").getResultList();

那个加载并根据我的 netbeans 调试器获取所有类别。

这是一个不起作用的实体。

enter code herepackage com.ajrs.entities;

import java.io.Serializable;
import java.sql.Timestamp;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import static javax.persistence.CascadeType.*;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.*;
import javax.persistence.NamedNativeQuery;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.PrePersist;
import javax.persistence.PreUpdate;
import javax.persistence.SequenceGenerator;
import javax.persistence.Transient;

@Entity
@NamedQueries({
@NamedQuery(
name="Note.oldgetByClaimNo",
        query="select n from Note n where n.claimNo = :claim_no order by n.created"
        ),
        @NamedQuery(
name="Note.getByCategoryAndSubcategory",
        query="select n from Note n where n.claimNo = :claim_no and n.category = :category and n.subcategory = :subcategory order by n.created"
        )
})
@NamedNativeQuery(name="Note.getByClaimNo",
query=
    "select claim_no, userid, date, note, category, subcategory, note_id from "+
    "(      select 1 as ord1, extract (epoch from date) as ord2, claim_no, userid, date, note, category, subcategory, note_id "+
    "       from note " +
    "       where claim_no = :claim_no "+
    "       and(subcategory is null or category != 'VI') " +
    "       and date <= (select coalesce(min(date),'1/1/3999') " +
    "                    from note n2 " +
    "                    where n2.claim_no = note.claim_no " +
    "                      and (n2.subcategory is not null " +
    "                           and n2.category = 'VI')" +
    "                          ) "+
    "       union "+
    "       select 2 as ord1, sort_order as ord2, claim_no, userid, date, note, category, subcategory, note_id " +
    "       from(select note.*, sort_order " +
    "                from note inner join lk_note_subcategory using(subcategory) "+
    "                where claim_no = :claim_no "+
    "               and (note.subcategory is not null and " +
    "                        note.category = 'VI') "+
    "               ) as foo " +
    "       union " +
    "       select 3 as ord1, extract (epoch from date) as ord2, claim_no, userid, date, note, category, subcategory, note_id "+
    "       from note " +
    "       where claim_no = :claim_no "+
    "       and(subcategory is null or category != 'VI') " +
    "       and date > (select coalesce(min(date),'1/1/3999') " +
    "                    from note n2 " +
    "                    where n2.claim_no = note.claim_no " +
    "                      and (n2.subcategory is not null " +
    "                           and n2.category = 'VI')" +
    "                          ) "+
    ") as dummy " +
    "order by ord1, ord2"
    , resultClass=Note.class)


    public class Note implements Serializable {
public static final long serialVersionUID = 1L;

@Id
@GeneratedValue(strategy=SEQUENCE, generator="NOTE_SEQUENCE_GENERATOR")
@SequenceGenerator(name="NOTE_SEQUENCE_GENERATOR", sequenceName="NOTE_NOTE_ID_SEQ")
private int note_id;

private String note;
private String userid;
@Column(name="claim_no")
private String claimNo;
@Column(name="date")
private Timestamp created;
private String category = "";
private String subcategory;

/* Transient properties */
@Transient
private boolean updated = false;

public String getUser() {
    return userid; }

public void setUser(String u) {
    userid = u;}

public String getNote() {
    return note; }

public void setNote(String n) {
    note = n; }

public String getClaimNo() {
    return claimNo; }

public void setClaimNo(String c) {
    claimNo = c; }

public Timestamp getTimestamp() {
    return created;
}
public void setTimestamp(Timestamp timestamp) {
    this.created = timestamp;
}

public String getCategory() {
    return category;
}

public void setCategory(String category) {
    this.category = category;
}

public String getSubcategory() {
    return subcategory;
}

public void setSubcategory(String subcategory) {
    this.subcategory = subcategory;
}

public boolean isUpdated() {
    return updated;
}

public void setUpdated(boolean updated) {
    this.updated = updated;
}

@PrePersist
@PreUpdate
private void fillDate() {
    setTimestamp(new Timestamp(System.currentTimeMillis()));
}

}

在这个不起作用的实体上，我使用以下内容来创建它。

currentNotesArray = em.createNamedQuery("Note.getByClaimNo").
            setParameter("claim_no", claimNumber).getResultList();

然后我用调试器查看这个 ArrayList，它是 Null，我在其他阶段也看到它是大小为 0 的 ArrayList。

任何人都知道为什么会这样。我被难住了。

授予

Answer 1

我想出了这个。简单的愚蠢错误。我一直在使用我的开发数据库来收集通过简单数据库连接收集的所有数据，尽管我未能将persistence.xml 更改为开发数据库。一旦我这样做了，显示数据就没有问题了。