com.mysql.jdbc.exceptions.jdbc4.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 'COMMAND='查看'' at line 1

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:422)

at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)

at com.mysql.jdbc.Util.getInstance(Util.java:408)

at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3970)

at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3906)

at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2524)

at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2677)

at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2549)

at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)

at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1962)

at com.servlet.ListServlet.doGet(ListServlet.java:62)

at com.servlet.ListServlet.doPost(ListServlet.java:89)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)

at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)

at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)

at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)

at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)

at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)

at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)

at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)

at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)

at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)

at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1096)

at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:674)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1500)

at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1456)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

at java.lang.Thread.run(Thread.java:745)

StringBuilder sql =new StringBuilder(" select ID,COMMAND,DESCRIPTION,CONTENT from message where 1=1");

List<String> paramList = new ArrayList<String>();

if(command!=null && !"".equals(command.trim())){

sql.append("and COMMAND=? ");

paramList.add(command);

}

if(description!=null && !"".equals(description.trim())){

sql.append(" and DESCRIPTION like '%' ? '%'");

paramList.add(description);

}

PreparedStatement ptmt = conn.prepareStatement(sql.toString());

for (int i = 0; i < paramList.size(); i++) {

ptmt.setString(i + 1, paramList.get(i));

}

哪里有錯呢？