Java - H2 数据库 - getGeneratedKeys() 不返回任何结果

Posted 2023-03-27

【中文标题】Java - H2 数据库 - getGeneratedKeys() 不返回任何结果

【英文标题】：Java - H2 Database - getGeneratedKeys() not returning any results

【发布时间】：2013-02-02 18:11:00

【问题描述】：

好吧，我错过了什么？

我有一张这样的桌子：

CREATE TABLE PUBLIC.RESULTS
(RESULTID IDENTITY NOT NULL,
SOURCEID INTEGER NOT NULL,
PARENTID INTEGER,
NAME VARCHAR(25) NOT NULL,
VALUE CLOB NOT NULL,
PRIMARY KEY (RESULTID))

我尝试让 RESULTID 既是带有 AUTO_INCREMENT 的 INTEGER，又是 IDENTITY 类型。

我正在使用准备好的语句，无论我做什么，在尝试设置 a: 的值时都会抛出“无数据”异常：

String sql = "INSERT INTO RESULTS (SOURCEID, PARENTID, NAME, VALUE) VALUES (?, ?, ?, ?)";
PreparedStatement stmt = null;
stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);
... Truncated setting of values ...

stmt.executeUpdate();
conn.commit();
ResultSet rs2 = stmt.getGeneratedKeys();
rs2.next();
Integer a = rs2.getInt(1);

当我实际查看数据库时，数据已正确插入，为 RESULTID 字段设置下一个值就好了，我似乎无法返回该值。

我必须做一些愚蠢的事情，因为这应该有效。有什么想法吗？

由于有人询问完整的堆栈跟踪如下：

org.h2.jdbc.JdbcSQLException: No data is available [2000-170]
    at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
    at org.h2.message.DbException.get(DbException.java:169)
    at org.h2.message.DbException.get(DbException.java:146)
    at org.h2.message.DbException.get(DbException.java:135)
    at org.h2.jdbc.JdbcResultSet.checkOnValidRow(JdbcResultSet.java:2957)
    at org.h2.jdbc.JdbcResultSet.get(JdbcResultSet.java:2963)
    at org.h2.jdbc.JdbcResultSet.getInt(JdbcResultSet.java:307)
    at com.cigital.db.DefaultDb.storeValue(DefaultDb.java:147)
    at com.cigital.db.DefaultDb.processResult(DefaultDb.java:115)
    at com.cigital.db.DefaultDb.importScan(DefaultDb.java:84)
    at com.cigital.gui.Default.jButImportActionPerformed(Default.java:373)
    at com.cigital.gui.Default.access$400(Default.java:26)
    at com.cigital.gui.Default$6.actionPerformed(Default.java:131)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
    at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
    at java.awt.Component.processMouseEvent(Component.java:6289)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
    at java.awt.Component.processEvent(Component.java:6054)
    at java.awt.Container.processEvent(Container.java:2041)
    at java.awt.Component.dispatchEventImpl(Component.java:4652)
    at java.awt.Container.dispatchEventImpl(Container.java:2099)
    at java.awt.Component.dispatchEvent(Component.java:4482)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
    at java.awt.Container.dispatchEventImpl(Container.java:2085)
    at java.awt.Window.dispatchEventImpl(Window.java:2478)
    at java.awt.Component.dispatchEvent(Component.java:4482)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
    at java.awt.EventQueue.access$000(EventQueue.java:85)
    at java.awt.EventQueue$1.run(EventQueue.java:603)
    at java.awt.EventQueue$1.run(EventQueue.java:601)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
    at java.awt.EventQueue$2.run(EventQueue.java:617)
    at java.awt.EventQueue$2.run(EventQueue.java:615)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

【问题讨论】：

您是否尝试过在提交连接之前获取生成的密钥？异常的完整堆栈跟踪是什么？

将堆栈跟踪添加到帖子中...

我刚刚重读了您的帖子，并意识到您建议我在提交之前先拔出钥匙。我回去并在代码中更改了它，果然它有效！这对我来说似乎很奇怪...如果您想将其作为实际答案发布，我可以接受...

做到了。我没有解释或文档参考。这对我来说似乎更合乎逻辑。

【参考方案1】：

您需要在提交连接之前获取生成的密钥，而不是之后。