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我正在尝试执行 registercase.jsp 页面，该页面在向 insert.jsp 提交这些详细信息后具有一些表单详细信息，在 tomcat 日志中出现以下错误。如果可能，请帮助我。

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 ') values('null','null','null',null)' at line 1com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that c
orresponds to your MySQL server version for the right syntax to use near ') values('null','null','null',null)' at line 1
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.Util.getInstance(Util.java:386)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4120)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4052)
        at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2503)
        at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2664)
        at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2788)
        at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1816)
        at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1730)
        at org.apache.jsp.insert_jsp._jspService(insert_jsp.java:75)
        at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
        at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        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.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:936)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
        at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1852)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)

询问 - 

int i=st.executeUpdate ("insert into  issue_creating(issue_id,case_title,Problem_Submit,Problem_De‌​scr,) values('"+Issue_ID+"','"+Case_Title+"','"+Problem_Submit+"',‌​'"+Problem_Descr+"')‌​");
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1 回答 1

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您应该以格式良好的插入语句组织查询。

  1. 这里不应该有任何额外的逗号（，） - Problem_De‌​scr，

它应该是 -

int i=st.executeUpdate (
"insert into issue_creating(issue_id,case_title,Problem_Submit,Problem_De‌​
scr) values('"+Issue_ID+"','"+Case_Title+"','"+Problem_Submit+"',‌​
'"+Problem_Descr+"')‌​");

以后请使用PreparedStatement以避免此类问题。

我希望这将有所帮助。

于 2017-06-12T15:02:16.603 回答