Question

我已经在这几个小时了，并且一直在谷歌上搜索，我似乎无法解决它。

当我运行代码时，我得到一个异常，堆栈跟踪的顶部告诉我我有一个sql语法错误，但我无法发现它。

我已经尝试了几种解决方案，但我仍在画空白，感谢任何帮助

由于彼得

private String insertBookingKnownUser(Connection connection,
     HttpServletRequest request) throws SQLException
     {


  try
  {
     String queryString = "INSERT INTO booking (hotelNo, guestNo, dateFrom, dateTo, roomNo) VALUES (?, ?, ?, ?, ?)";
     statement = (PreparedStatement) connection.prepareStatement(queryString);
     int hotelNumber = Integer.parseInt(request.getParameter("hotelNumber"));
     //REMEMBER TO CHANGE GUESTNUMBER
     int guestNumber = 1;
     DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 
     Date dateFrom;
     dateFrom = (Date)formatter.parse(request.getParameter("dateFrom"));
     java.sql.Date sqlDateFrom = new java.sql.Date(dateFrom.getTime()); 
     Date dateTo = (Date)formatter.parse(request.getParameter("dateTo"));
     java.sql.Date sqlDateTo = new java.sql.Date(dateTo.getTime()); 
     int roomNumber= Integer.parseInt(request.getParameter("roomNumber"));

     statement.setInt(1, hotelNumber);
     statement.setInt(2, guestNumber);
     statement.setDate(3, sqlDateFrom);
     statement.setDate(4, sqlDateTo);
     statement.setInt(5, roomNumber);
     statement.executeUpdate(queryString);
  }
  catch (Exception e)
  {
     e.printStackTrace();
  }
  return "";
     }

编辑：删除分号，仍然得到相同的错误

Stacktrace：

statementcom.mysql.jdbc.exceptions.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '?, ?, ?, ?, ?)' at line 1
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985)
 at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631)
 at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723)
 at com.mysql.jdbc.Connection.execSQL(Connection.java:3277)
 at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1402)
 at com.mysql.jdbc.Statement.executeUpdate(Statement.java:1317)
 at SimpleServlet.insertBookingKnownUser(SimpleServlet.java:227)
 at SimpleServlet.doGet(SimpleServlet.java:81)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
 at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
 at java.lang.Thread.run(Thread.java:724)

Answer 1

您必须致电statement.executeUpdate()而不是statement.executeUpdate(queryString)。

当您调用executeUpdate()时，它会考虑您之前在语句中设置的参数，但是当您调用executeUpdate(String s)时，它只会在没有设置参数的情况下执行给定的查询。

从java servlet插入到mysql，插入语句不起作用

1 个答案: