Question

我收到以下错误：

com.mysql.jdbc.exceptions.MySQLSyntaxErrorException：未知列＆＃39;两性＆＃39;在＆＃39;字段列表＆＃39;在 com.mysql.jdbc.SQLError.createSQLException（SQLError.java:936）at at com.mysql.jdbc.MysqlIO.checkErrorPacket（MysqlIO.java:2985）at at com.mysql.jdbc.MysqlIO.sendCommand（MysqlIO.java:1631）at at com.mysql.jdbc.MysqlIO.sqlQueryDirect（MysqlIO.java:1723）at at com.mysql.jdbc.Connection.execSQL（Connection.java:3250）at com.mysql.jdbc.Statement.executeUpdate（Statement.java:1355）at com.mysql.jdbc.Statement.executeUpdate（Statement.java:1270）at org.apache.jsp.reg_jsp._jspService(reg_jsp.java:157）at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70）at javax.servlet.http.HttpServlet.service（HttpServlet.java:729）at at org.apache.jasper.servlet.JspServletWrapper.service（JspServletWrapper.java:438）在 org.apache.jasper.servlet.JspServlet.serviceJspFile（JspServlet.java:396）在org.apache.jasper.servlet.JspServlet.service（JspServlet.java:340）在javax.servlet.http.HttpServlet.service（HttpServlet.java:729）at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:291）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在 org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:52）在 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:239）在 org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:206）在 org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:217）在 org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:106）在 org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:502）在 org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:142）在 org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:79）在 org.apache.catalina.valves.AbstractAccessLogValve.invoke（AbstractAccessLogValve.java:616）在 org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:88）在 org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:518）在 org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1091）在 org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:673）在 org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1500）在 org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1456） at java.util.concurrent.ThreadPoolExecutor.runWorker（Unknown Source） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（Unknown Source）在 org.apache.tomcat.util.threads.TaskThread $ WrappingRunnable.run（TaskThread.java:61）在java.lang.Thread.run（未知来源）没有 insertedcom.mysql.jdbc.exceptions.MySQLSyntaxErrorException：未知栏＆＃39;性别＆＃39;在＆＃39;字段列表＆＃39;

从这段代码：

String fname=request.getParameter("firstnm"); 
String lnames=request.getParameter("lname"); 
String gen=request.getParameter("ddlGender"); 
String mail=request.getParameter("txtMailID"); 
String mobile=request.getParameter("txtMobilenumber"); 
String pass1=request.getParameter("txtPass"); 
String pass2=request.getParameter("txtPass1"); 
Integer tim=Integer.parseInt(mobile); 
Integer passw=Integer.parseInt(pass1); 
Integer passw2=Integer.parseInt(pass2);

String query="INSERT INTO register (firstname, lastname, gender, email, mobile, password1, password2) VALUES('"+fname+"','"+lnames+"','"+gen+"','"+mail+"','"+tim+‌"','"+passw+"','"+pa‌ssw2+"')"; 
try { 
    Class.forName("com.mysql.jdbc.Driver").newInstance();
    cons=DriverManager.getConnection(conurl,conuname,conpass);
    stmt=cons.createStatement();
    stmt.executeUpdate(query);
    System.out.println("inserted");
    cons.close(); 
} catch(Exception ex){ 
    ex.printStackTrace(); 
    System.out.println("not inserted"+ex); 
}

Answer 1

您的代码中似乎存在一个小问题您不能使用"+VARIABLE_NAME+"在数据库中插入Integer数据类型，它仅适用于String数据类型。而是插入Integer drop单个倒置引号并仅使用"+VARIABLE_NAME+"。

将您的SQL查询修改为，

String query="INSERT INTO register (firstname, lastname, gender, email, mobile, password1, password2) 
   VALUES('"+fname+"','"+lnames+"','"+gen+"','"+mail+"',"+tim+‌","+passw+","+pa‌ssw2+")";

我的JSP在将数据插入mysql数据库时遇到错误

1 个答案: