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POjsp coding problem
 

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    <p>I am a programmer, new to jsp, trying to write some code.</p> <p>i have written like </p> <pre><code> &lt;% int i=1; String connectionURL = "jdbc:mysql://localhost:3306/registration"; Connection connection = null; Statement stmt = null; ResultSet rset = null; Statement stmt1 = null; ResultSet rset1 = null; Class.forName("com.mysql.jdbc.Driver").newInstance(); int updateQuery = 0; try { connection = DBUtil.createConnection();//DriverManager.getConnection(connectionURL, "root", "root"); String queryString = "select * from course"; System.out.println("select all from course table"); stmt = connection.createStatement(); System.out.println("Statment object "+ stmt ); rset = stmt.executeQuery(queryString); System.out.println("Result set " + rset ); while (rset.next()) { System.out.println(" Results..."); String s1 = rset.getString(1); Double amount = rset.getDouble("amount"); String loginid = rset.getString("loginid"); String queryString1 = "select * from users where loginid = '"+ loginid +"'"; System.out.println("select user details from users table"); System.out.println(queryString1); stmt1 = connection.createStatement(); System.out.println("Statment object "+ stmt1 ); rset1 = stmt1.executeQuery(queryString1); System.out.println("Result set " + rset1 ); System.out.println(" name -&gt; " + rset1.getString(2)); %&gt; &lt;tr class="subtext1"&gt; &lt;td align="left"&gt;&lt;%=i%&gt; &lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("name")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("loginid")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("name")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("email")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("iimbtrack")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("result")%&gt;&lt;/td&gt; &lt;td align="left"&gt;CourseFee/&lt;%=rset.getString("product")%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=amount%&gt;&lt;/td&gt; &lt;td align="left"&gt;&lt;%=rset.getString("fdate")%&gt;&lt;/td&gt; &lt;/tr&gt; </code></pre> <p>When I try to print this, it gives error. But when I remove this line:</p> <pre><code>System.out.println(" name -&gt; " + rset1.getString(2)); </code></pre> <p>It works. Where am I going wrong?</p> <p>This is the error I get</p> <pre><code>statment object com.mysql.jdbc.Statement@429be9 Result set com.mysql.jdbc.ResultSet@10a0d51 java.sql.SQLException: Before start of result set at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910) at com.mysql.jdbc.ResultSet.checkRowPos(ResultSet.java:703) at com.mysql.jdbc.ResultSet.getStringInternal(ResultSet.java:5653) at com.mysql.jdbc.ResultSet.getString(ResultSet.java:5597) at org.apache.jsp.WEB_002dINF.jsp.secure.transaction.feesreports_jsp._jspService(feesreports_jsp.java:235) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:329) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:679) at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:461) at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:399) at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:301) at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1056) at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:261) at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:388) at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:316) at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:231) at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1158) at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:397) at javax.servlet.http.HttpServlet.service(HttpServlet.java:627) at javax.servlet.http.HttpServlet.service(HttpServlet.java:729) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875) at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) </code></pre>
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    1. COYou should use a PreparedStatement for your second query because (1) it's called once for every loop iteration and (2) it has a parameter. Create the object outside of the while loop, then set the parameter inside the while loop. `PreparedStatement ps = conn.preparedStatement("select * from users where loginid = ?"); ps.setString(1, loginId);`
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