java - MySQL and JSP Database connectivity with Glassfish server 4 -

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here code.

    **insert.html**         <html>             <head>                 <title>donate blood !</title>                 <meta charset="utf-8">                 <meta name="viewport" content="width=device-width, initial-scale=1.0">             </head>             <body>                 <form action="store.jsp" method="post">                     name: <input type="text" name="nam"><br>                     rollno: <input type="text" name="rno"><br>                     blood group: <input type="text" name="grp"><br>                     <input type="submit" value="add me !">                 </form>             </body>         </html>  **store.jsp** <%@page import="java.sql.drivermanager"%> <%@page import="java.sql.statement"%> <%@page import="java.sql.connection"%> <%             string name = request.getparameter("nam");             string roll = request.getparameter("rno");             string group = request.getparameter("grp");              class.forname("com.mysql.jdbc.driver").newinstance();             connection con = drivermanager.getconnection("jdbc:mysql://localhost:3306/blood","root","");             statement st = con.createstatement();             int i=st.executeupdate("insert blood(name,rollno,bloodgroup) values('+name+','+roll+','+group+')");         %>

my database.. enter image description here

i running code in netbeans 8.0. got error log enter image description here

it shows data long blood group given 'a+' in textbox. whats going wrong. new jsp please me. in advance.

try using preparedstatement instead avoid string concatenation mistakes.

preparedstatement st = con.preparestatement("insert blood(name,rollno,bloodgroup) values(?,?,?)"); st.setstring(1, name); st.setstring(2, roll); st.setstring(3, group); st.executeupdate();

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