标题是我遇到的问题。有什么想法可以解决这个问题吗？过去5个小时，我一直在玩这个游戏。
这是我的代码，如果您有任何疑问，请告诉我。
* ID是全局变量
String UpdateFirst = txtFirstSettings.getText();
String UpdateLast = txtLastSettings.getText();
String UpdateSex = txtSexSettings.getText();
String UpdateJobTitle = txtJobTitleSettings.getText();
String UpdateEmail = txtEmailSettings.getText();
String UpdateLawFirm = txtLawFirmSettings.getText();
try {
String host = "jdbc:derby://localhost:1527/Lawyers";
String uName = "spyfire14";
String uPass = "spyfire14";
Connection con = DriverManager.getConnection(host, uName, uPass);
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
String sql = "SELECT * FROM LAWYERLISTS WHERE ID = " + ID;
ResultSet rs = stmt.executeQuery(sql);
rs.first();
rs.updateString("FIRST_NAME", UpdateFirst);
rs.updateString("LAST_NAME", UpdateLast);
rs.updateString("SEX", UpdateSex);
rs.updateString("JOB_TITLE", UpdateJobTitle);
rs.updateString("EMAIL", UpdateEmail);
//Include a confirmation
rs.updateRow();
rs.close();
stmt.close();
System.out.println(UpdateEmail);
System.out.println(rs.getString("EMAIL"));
} catch (SQLException ex) {
Logger.getLogger(Home.class.getName()).log(Level.SEVERE, null, ex);
}
这是完整的异常代码：
Aug 31, 2018 5:18:10 PM dashboardapp.Home btnSaveSettingsMouseReleased
SEVERE: null
java.sql.SQLTransactionRollbackException: A lock could not be obtained within the time requested
at org.apache.derby.client.am.SQLExceptionFactory40.getSQLException(Unknown Source)
at org.apache.derby.client.am.SqlException.getSQLException(Unknown Source)
at org.apache.derby.client.am.ResultSet.updateRow(Unknown Source)
at dashboardapp.Home.btnSaveSettingsMouseReleased(Home.java:1851)
at dashboardapp.Home.access$600(Home.java:46)
at dashboardapp.Home$6.mouseReleased(Home.java:365)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:290)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2238)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2296)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4897)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4534)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4475)
at java.awt.Container.dispatchEventImpl(Container.java:2282)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Caused by: org.apache.derby.client.am.SqlException: A lock could not be obtained within the time requested
at org.apache.derby.client.am.Statement.completeExecute(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.parseEXCSQLSTTreply(Unknown Source)
at org.apache.derby.client.net.NetStatementReply.readExecute(Unknown Source)
at org.apache.derby.client.net.StatementReply.readExecute(Unknown Source)
at org.apache.derby.client.net.NetPreparedStatement.readExecute_(Unknown Source)
at org.apache.derby.client.am.ResultSet.readUpdateRow(Unknown Source)
at org.apache.derby.client.am.ResultSet.update(Unknown Source)
at org.apache.derby.client.am.ResultSet.updateRowX(Unknown Source)
... 36 more
编辑：我按照评论的意思做了，我知道没有得到警告，但是它实际上并没有改变数据库
Connection con = DriverManager.getConnection(host, uName, uPass);
con.setAutoCommit(false);
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_UPDATABLE);
String sql = "SELECT * FROM LAWYERLISTS WHERE ID = " + ID;
ResultSet rs = stmt.executeQuery(sql);
rs.first();
rs.updateString("FIRST_NAME", UpdateFirst);
rs.updateString("LAST_NAME", UpdateLast);
rs.updateString("SEX", UpdateSex);
rs.updateString("JOB_TITLE", UpdateJobTitle);
rs.updateString("EMAIL", UpdateEmail);
con.commit();
//Include a confirmation
//rs.updateRow();
rs.close();
stmt.close();