probliem in pagiation

Hi
the code provided for displaying editable datagrid in jsp works fine.
but there is some pagination problem.when my sql data are more then 5 record,
the link for 2 nd page doesn't work.

Regards
Eswaramoorty

here is the provided code
http://www.roseindia.net/answers/viewanswers/9032.html

View Answers

March 23, 2010 at 3:17 PM

u have to use the diplay tag s in jsp page for example:don;t use script code ,just u an provide property name.

<display:column ...........

March 23, 2010 at 3:28 PM

Hi Friend,

Try the following code:

1)datagrid.jsp:

<%@ page language="java" %>
<%@ page import="java.sql.*" %>
<%!
public int nullIntconvert(String str){
int num=0;
if(str==null) {
str="0";
}
else if((str.trim()).equals("null")) {
str="0";
}
else if(str.equals("")) {
str="0";
}
try{
num=Integer.parseInt(str);
}
catch(Exception e) { }
return num;
}
%>
<%
Connection conn = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root";, "root");
ResultSet rs1 = null;
ResultSet rs2 = null;
PreparedStatement ps1=null;
PreparedStatement ps2=null;

int showRows=5;
int totalRecords=5;
int totalRows=nullIntconvert(request.getParameter("totalRows"));
int totalPages=nullIntconvert(request.getParameter("totalPages"));
int iPageNo=nullIntconvert(request.getParameter("iPageNo"));
int cPageNo=nullIntconvert(request.getParameter("cPageNo"));

int startResult=0;
int endResult=0;
if(iPageNo==0){
iPageNo=0;
}
else{
iPageNo=Math.abs((iPageNo-1)*showRows);
}
String query1="SELECT SQL_CALC_FOUND_ROWS * FROM student limit "+iPageNo+","+showRows+"";
ps1=conn.prepareStatement(query1);
rs1=ps1.executeQuery();
String query2="SELECT FOUND_ROWS() as cnt";
ps2=conn.prepareStatement(query2);
rs2=ps2.executeQuery();
if(rs2.next()) {
totalRows=rs2.getInt("cnt");
System.out.println(totalRows);
}
%>
<html>
<h3>Pagination of JSP page</h3>
<body>
<form method="post" action="upgrid.jsp">
<input type="hidden" name="iPageNo" value="<%=iPageNo%>">
<input type="hidden" name="cPageNo" value="<%=cPageNo%>">
<input type="hidden" name="showRows" value="<%=showRows%>">
<table width="100%" cellpadding="0" cellspacing="0" border="1" >
<tr>
<td>Roll No</td>
<td>Name</td>
<td>Marks</td>
<td>Grade</td>
</tr>
<%
while(rs1.next()){
%>
<tr>
<td><input type="text" name="no" size="38" value="<%=rs1.getInt("rollNo")%>"></td>
<td><input type="text" name="name" size="38" value="<%=rs1.getString("name")%>"></td>
<td><input type="text" name="marks" size="38" value="<%=rs1.getInt("marks")%>"></td>
<td><input type="text" name="grade" size="38" value="<%=rs1.getString("grade")%>"></td>
</tr>
<%
}
%>
<%
try{
if(totalRows<(iPageNo+showRows)) {
endResult=totalRows;
}
else{
endResult=(iPageNo+showRows);
}
startResult=(iPageNo+1);
totalPages=((int)(Math.ceil((double)totalRows/showRows)));
}
catch(Exception e){
e.printStackTrace();
}
%>
<tr>
<td colspan="3">
<div>

March 23, 2010 at 3:29 PM

continue..

<%
int i=0;
int cPage=0;
if(totalRows!=0) {
cPage=((int)(Math.ceil((double)endResult/(totalRecords*showRows))));
int prePageNo=(cPage*totalRecords)-((totalRecords-1)+totalRecords);
if((cPage*totalRecords)-(totalRecords)>0){
%>
<a href="datagrid.jsp?iPageNo=<%=prePageNo%>&cPageNo=<%=prePageNo%>"> << Previous</a>
<%
}
for(i=((cPage*totalRecords)-(totalRecords-1));i<=(cPage*totalRecords);i++){
if(i==((iPageNo/showRows)+1)){%>
<a href="datagrid.jsp?iPageNo=<%=i%>" style="cursor:pointer;color: red"><b><%=i%></b></a>
<%
}
else if(i<=totalPages){
%>
<a href="datagrid.jsp?iPageNo=<%=i%>"><%=i%></a>
<%
}
}
if(totalPages>totalRecords && i<totalPages){
%>
<a href="datagrid.jsp?iPageNo=<%=i%>&cPageNo=<%=i%>"> >> Next</a>
<%
}
}
%>
<b>Rows <%=startResult%>-<%=endResult%>Total Rows<%=totalRows%> </b>
</div>
</td>
</tr>
</table>
<input type="submit" value="Update">
</form>
</body>
</html>
<%
try{
if(ps1!=null){
ps1.close();
}
if(rs1!=null){
rs1.close();
}

if(ps2!=null){
ps2.close();
}
if(rs2!=null){
rs2.close();
}
if(conn!=null){
conn.close();
}
}
catch(Exception e)
{
e.printStackTrace();
}
%>

2)upgrid.jsp:

<%@ page import="java.sql.*" %>
<%
String d[] =request.getParameterValues("no");
if(d !=null) {
for(int i=0;i<d.length;i++) {
out.println(d[i]);
}
}
String name[] =request.getParameterValues("name");
if(name !=null) {
for(int i=0;i<name.length;i++) {
out.println(name[i]);
}
}
String marks[] =request.getParameterValues("marks");
if(marks !=null) {
for(int i=0;i<marks.length;i++) {
out.println(marks[i]);
}
}
String grade[] =request.getParameterValues("grade");
if(grade !=null) {
for(int i=0;i<grade.length;i++) {
out.println(grade[i]);
}
}
%>
<%
try{
Connection conn = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root";, "root");

Statement st=null;
st=conn.createStatement();
for(int a=0;a<30;a++){
String no=d[a];
String n=name[a];
String mar=marks[a];
String g=grade[a];
st.executeUpdate("update student set name='"+n+"', marks='"+mar+"', grade='"+g+"' where rollNo='"+no+"'");
}
}
catch(Exception e){
e.printStackTrace();
}
%>

Thanks