Zugreifen auf MS Access DB von der Webanwendung

Ich habe den folgenden Fehler erhalten, als ich versuchte, auf die Tabelle in MS Access DB zuzugreifen.Zugreifen auf MS Access DB von der Webanwendung

Ich habe die DB separat erstellt.

Unten ist der Code.

Wenn ich versuche, die Anzahl der Datensätze zu finden, funktioniert es gut. Aber wenn ich versuche, die Datensätze für einen Benutzer abzurufen, gibt es mir den Fehler.

Bitte sagen Sie mir, was zu tun ist.

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc:::3.0.4 user lacks privilege or object not found: AAA 
    at net.ucanaccess.jdbc.UcanaccessStatement.execute(UcanaccessStatement.java:154) 
    at com.infy.dao.LoginActionDAO.ValidateLogin(LoginActionDAO.java:32) 
    at com.infy.HelloWorldAction.execute(HelloWorldAction.java:33) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
    at java.lang.reflect.Method.invoke(Method.java:498) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254) 
    at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176) 
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263) 
    at org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68) 
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:133) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207) 
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:235) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:267) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:142) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:166) 
    at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187) 
    at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248) 
    at org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52) 
    at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:488) 
    at org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:395) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:588) 
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) 
    at java.lang.Thread.run(Thread.java:745) 
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: AAA 
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source) 
    at org.hsqldb.jdbc.Util.sqlException(Unknown Source) 
    at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) 
    at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source) 
    at net.ucanaccess.jdbc.Execute.executeWrapped(Execute.java:56) 
    at net.ucanaccess.jdbc.AbstractExecute.executeBase(AbstractExecute.java:152) 
    at net.ucanaccess.jdbc.Execute.execute(Execute.java:46) 
    at net.ucanaccess.jdbc.UcanaccessStatement.execute(UcanaccessStatement.java:152) 
    ... 66 more 
Caused by: org.hsqldb.HsqlException: user lacks privilege or object not found: AAA 
    at org.hsqldb.error.Error.error(Unknown Source) 
    at org.hsqldb.error.Error.error(Unknown Source) 
    at org.hsqldb.ExpressionColumn.checkColumnsResolved(Unknown Source) 
    at org.hsqldb.QueryExpression.resolve(Unknown Source) 
    at org.hsqldb.ParserDQL.compileCursorSpecification(Unknown Source) 
    at org.hsqldb.ParserCommand.compilePart(Unknown Source) 
    at org.hsqldb.ParserCommand.compileStatements(Unknown Source) 
    at org.hsqldb.Session.executeDirectStatement(Unknown Source) 
    at org.hsqldb.Session.execute(Unknown Source) 
    ... 72 more

Quelle

2016-04-01 nikhila reddy

Verwenden Sie ein 'PreparedStatement' statt (falsch!) Werte in der Abfrage-String verketten . Das Grundproblem besteht darin, dass Sie keine Anführungszeichen um den Wert des Benutzernamens haben, daher wird er als Spaltenname und nicht als Wert betrachtet, Sie sollten jedoch stattdessen eine vorbereitete Anweisung verwenden. –

Danke Mark !! :) Du hast recht. –

Sie erhalten den Fehler

net.ucanaccess.jdbc.UcanaccessSQLException: UCAExc ::: 3.0.4 Benutzer fehlt Privileg oder Objekt nicht gefunden: AAA

weil Ihr Code erstellt die SQL-Abfrage

select count(*) from Users where UserName=AAA

und AAA ist Wird als Spaltenname und nicht als Zeichenfolgenwert interpretiert.

Die richtige Lösung ist, eine PreparedStatement zu verwenden, um eine parametrisierte Abfrage durchzuführen, die wie folgt aussehen würde:

String query = "SELECT * FROM Users WHERE UserName=?"; 
PreparedStatement s = con.prepareStatement(query); 
s.setString(1, un); 
ResultSet rs = s.executeQuery(); 
if (rs.next()) { 
    // matching row found, so continue processing 
} else { 
    // no matching row found, so inform user and/or log error 
}

Quelle

2016-04-01 11:10:22

Danke Thompson für die Freigabe des Codes. Es funktionierte!!! –

Zugreifen auf MS Access DB von der Webanwendung

Antwort

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