SQLException:已用尽的结果集 [英] SQLException: Exhausted Resultset
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问题描述
我的JDBC代码有问题。这是相关的代码:
I have a problem with my JDBC code. This is the relevant code:
/** method for checking password into the Oracle database */
public String CheckUserDB(String userToCheck) throws SQLException {
String storedPassword;
if (ds == null) throw new SQLException("No data source");
Connection conn = ds.getConnection();
if (conn == null) throw new SQLException("No connection");
try {
conn.setAutoCommit(false);
boolean committed = false;
try {
PreparedStatement passwordQuery = conn.prepareStatement(
"SELECT passwd from USERS WHERE userz = ?");
passwordQuery.setString(1, userToCheck);
ResultSet result = passwordQuery.executeQuery();
result.next();
storedPassword = result.getString("passwd");
conn.commit();
committed = true;
} finally {
if (!committed) conn.rollback();
}
}
finally {
conn.close();
}
return storedPassword;
}
这是例外:
java.sql.SQLException: Exhausted Resultset
oracle.jdbc.driver.OracleResultSetImpl.getString(OracleResultSetImpl.java:1270)
oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:494)
org.jboss.jca.adapters.jdbc.WrappedResultSet.getString(WrappedResultSet.java:1359)
com.dx.sr_57.user_check.CheckUserDB(user_check.java:100)
com.dx.sr_57.user_check.user_compare(user_check.java:123)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
java.lang.reflect.Method.invoke(Method.java:601)
org.apache.el.parser.AstValue.invoke(AstValue.java:196)
org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
javax.faces.component.UICommand.broadcast(UICommand.java:315)
javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
这是怎么造成的,如何解决?
How is this caused and how can I solve it?
推荐答案
result.next();
storedPassword = result.getString("passwd");
您没有检查下一个的返回值。如果你没有行就会遇到麻烦...
You are not checking the return value of next. If you have no rows you get into trouble...
if(result.next()){
storedPassword = result.getString("passwd");
}
这篇关于SQLException:已用尽的结果集的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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