我有一个java应用程序需要访问wordpress数据库，因为我无法使用wordpress xml-rpc来完成我需要的所有操作。我需要在 WordPress 中访问的主表是 wp_posts 表。我正在使用 eclipseLink 2.6 和 mysql 5.1.34
以下是我的 wp_posts 实体
@Entity
@Table(name="wp_posts")
public class WpPost implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name="ID")
private Integer id;
@Column(name="comment_count")
private Integer commentCount;
@Column(name="comment_status")
private String commentStatus;
@Column(name="guid")
private String guid;
@Column(name="menu_order")
private Integer menuOrder;
@Column(name="ping_status")
private String pingStatus;
More vars + getters and setters etc.....
我像这样运行查询
public final static String SELECT_ALL_WP_POST_ENTITIES_SQL = "SELECT o FROM WpPost AS o";
public List<WpPost> getAllEntities() {
final EntityManager entityManager = DaoUtilities
.getEntityManagerFactory().createEntityManager();
final List<WpPost> posts;
try {
posts = (List<WpPost>) entityManager.createQuery(
SELECT_ALL_WP_POST_ENTITIES_SQL).getResultList();
} finally {
entityManager.close();
}
return posts;
}
我收到以下错误
[EL Info]: server: 2015-03-31 10:10:59.234--ServerSession(472654579)--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform.
[EL Info]: server: 2015-03-31 10:10:59.682--ServerSession(472654579)--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform.
[EL Info]: 2015-03-31 10:11:00.296--ServerSession(472654579)--EclipseLink, version: Eclipse Persistence Services - 2.6.0.v20150309-bf26070
[EL Info]: connection: 2015-03-31 10:11:00.752--ServerSession(472654579)--/file:/home/alex/Dropbox/eclipseProjects/docoCrawler/wordpressDB/target/classes/_DefaultPersistence login successful
[EL Warning]: sql: 2015-03-31 10:11:00.818--ServerSession(472654579)--java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
[EL Warning]: 2015-03-31 10:11:00.82--UnitOfWork(91430202)--Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
Error Code: 0
Call: SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts
Query: ReadAllQuery(referenceClass=WpPost sql="SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts")
Exception in thread "main" javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
Error Code: 0
Call: SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts
Query: ReadAllQuery(referenceClass=WpPost sql="SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts")
at org.eclipse.persistence.internal.jpa.QueryImpl.getDetailedException(QueryImpl.java:382)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:260)
at org.eclipse.persistence.internal.jpa.QueryImpl.getResultList(QueryImpl.java:473)
at dao.PostDao.getAllEntities(PostDao.java:43)
at dao.PostDao.main(PostDao.java:33)
Caused by: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.0.v20150309-bf26070): org.eclipse.persistence.exceptions.DatabaseException
Internal Exception: java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
Error Code: 0
Call: SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts
Query: ReadAllQuery(referenceClass=WpPost sql="SELECT ID, comment_count, comment_status, guid, menu_order, ping_status, pinged, post_author, post_content, post_content_filtered, post_date, post_date_gmt, post_excerpt, post_mime_type, post_modified, post_modified_gmt, post_name, post_parent, post_password, post_status, post_title, post_type, to_ping FROM wp_posts")
at org.eclipse.persistence.exceptions.DatabaseException.sqlException(DatabaseException.java:331)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.getObject(DatabaseAccessor.java:1331)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.fetchRow(DatabaseAccessor.java:1077)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.processResultSet(DatabaseAccessor.java:770)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.basicExecuteCall(DatabaseAccessor.java:657)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.executeCall(DatabaseAccessor.java:560)
at org.eclipse.persistence.internal.sessions.AbstractSession.basicExecuteCall(AbstractSession.java:2055)
at org.eclipse.persistence.sessions.server.ServerSession.executeCall(ServerSession.java:570)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:242)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeCall(DatasourceCallQueryMechanism.java:228)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.executeSelectCall(DatasourceCallQueryMechanism.java:299)
at org.eclipse.persistence.internal.queries.DatasourceCallQueryMechanism.selectAllRows(DatasourceCallQueryMechanism.java:694)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRowsFromTable(ExpressionQueryMechanism.java:2740)
at org.eclipse.persistence.internal.queries.ExpressionQueryMechanism.selectAllRows(ExpressionQueryMechanism.java:2693)
at org.eclipse.persistence.queries.ReadAllQuery.executeObjectLevelReadQuery(ReadAllQuery.java:541)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeDatabaseQuery(ObjectLevelReadQuery.java:1173)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:904)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.execute(ObjectLevelReadQuery.java:1132)
at org.eclipse.persistence.queries.ReadAllQuery.execute(ReadAllQuery.java:442)
at org.eclipse.persistence.queries.ObjectLevelReadQuery.executeInUnitOfWork(ObjectLevelReadQuery.java:1220)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2896)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1857)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1839)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1804)
at org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery(QueryImpl.java:258)
... 3 more
Caused by: java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:996)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
at com.mysql.jdbc.ResultSetRow.getTimestampFast(ResultSetRow.java:928)
at com.mysql.jdbc.BufferRow.getTimestampFast(BufferRow.java:555)
at com.mysql.jdbc.ResultSetImpl.getTimestampInternal(ResultSetImpl.java:5943)
at com.mysql.jdbc.ResultSetImpl.getTimestamp(ResultSetImpl.java:5609)
at com.mysql.jdbc.ResultSetImpl.getObject(ResultSetImpl.java:4582)
at org.eclipse.persistence.internal.databaseaccess.DatabasePlatform.getObjectFromResultSet(DatabasePlatform.java:1392)
at org.eclipse.persistence.internal.databaseaccess.DatabaseAccessor.getObject(DatabaseAccessor.java:1302)
... 26 more
在 wp_posts 表上，所有列都选择了“not null”，但并非全部都给出了默认值。从我的错误消息中我可以看到行
java.sql.SQLException: Value '390open;http://127.0.0.1/wordpress/?post_type=optionsframework&p=390open
它正在从数据库获取第一行，其值为“39, 0, open, http://127.0.0.1/wordpress/?post_type=optionsframework&p=39” , 0, open' 映射到 'SELECT ID, comment_count, comment_status, guid, menu_order, ping_status'。然而，查询“pinged”中的下一个字段在数据库中没有值，这就是它失败的地方。如果我向该字段添加一个值，那么新值将添加到 sql 异常错误消息中，但稍后我会在几个字段中遇到问题，其中有更多字段没有值。如果我向所有字段添加值，则查询将运行。
我不想开始修改 WordPress 数据库。如何处理数据库中不为空但没有值的空字段？
更新:我认为是日期字段导致了问题。 WordPress 数据库中日期的默认值为 0000-00-00 00:00:00。如果数据库中有一行包含所有字段的值，那么像 0000-00-00 00:00:00 这样的日期不会引起问题。但是，如果我有一行的字段没有值，而其他日期字段的值类似于 0000-00-00 00:00:00，那么我会收到上述错误。或者，如果所有日期字段都有正确的日期值，则没有值的字段不会导致任何问题。因此，看来只有当我的行的日期字段值为 0000-00-00 00:00:00 并且我还有其他没有值的字段时，才会出现此问题。我所有的日期字段都用 @Temporal(TemporalType.TIMESTAMP) 标记，如下所示:
@Temporal(TemporalType.TIMESTAMP)
@Column(name="post_modified")
private Date postModified;
最佳答案
所以我已经解决了这个问题。我需要在 persistence.xml 中配置我的连接，通过添加 ZeroDateTimeBehavior=convertToNull 来处理零日期和时间，如下所示:
<property name="javax.persistence.jdbc.url"
value="jdbc:mysql://localhost:3306/wordpress_4.1?zeroDateTimeBehavior=convertToNull" />
这解决了我的问题
关于Java jpa 查询包含空字段的 WordPress 数据库时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29358330/