Resultset paging using jsp
I am creating a small search program using jsp. I want to know how can I implement paging using JDBC.
It is very easy using asp. In asp only a specified no. or records can be retrieved from database using combination of PageSize and AbsolutePage properties of Recordset Object.
In jdbc I think there is no such method available. Do I have to use database base specific options to limit the number of records returned like limit keyword in mysql.
Only way I can think of is to create a resultset object and store it in session and then use the absolute() method of the resultset object to go to a specific record and then next(). But still all records have to returned by db and have to be kept in memory and not only specific no. of records (e.g 10 per page).
If I doesn't store the recordset in session then every time this search page is accessed, a new recordset is returned with all records. I then have to determine how many records to skip according to page selected in the query string and then use absolute() method of recordset to go to specific record. And then loop, say ten times to display 10 records. Again when next is clicked same procedure is repeated. Here retrieving all records every time page is accessed is very expensive operation.
In my case even this isn't possible because I am using jdbc odbc bridge, which is not allowing scrollable resultset and jvm is throwing exception in native code. Without scrollable resultset I cannot know how many records are returned. If I try to count using a loop and resultset's next() then I don't have any way to go back to first record again when I actually want to retrieve records to display. Only other way to count the records is executing query twice which isn't very good as records may have been added or deleted between two calls.
Am I wrong anywhere above?
If not then question is, can this be done efficiently with jdbc without using any database specific keywords?
If yes then which method can be used on a busy web site with huge database.
--Sukhwinder Singh
This may help: http://www.powerobj.com
providing "advice" in this manner is unethical and unhelpful. if you feel a product you are selling would be good for someone you should at the very least disclose your interest in the selling of said product.
the blatant ad you posted in the JavaServer Pages forum at least makes it clear that you are selling a product. this post does not make that clear and it really should be.
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}catch(Exception e){}
%>
<%db(out);%>
</p>
</body>
</html>
phani is dsn name
login is table name
Good luck
phani -
HI All,
This is very urgent for me please help me to come out of this.
I just want to display the values in combobox from database using jsp,but i have difficulty in doing it can any one help me for this.I will be thankfull if any one gives me a code for the same.
Ramesh.Rvery simple example
<%@ page import="java.sql.*" %>
Add Item:
<SELECT NAME="item">
<ol>
<%
Connection con5 =
DriverManager.getConnection("url","user","password");
String q5 = "query" ;
Statement stmt5 = (Statement)con5.createStatement();
ResultSet rs5 = stmt5.executeQuery(q5);
while(rs5.next()){
String str5= rs5.getString("field");
%>
<li> <% out.print("<OPTION>" + str5); %>
<% } %>
</ol>
</SELECT> -
Error in File uploading using jsp
I am tring to upload files to a mysql database using jsp.I have used BLOB type to store files.Iam using the JDBC driver mysql-connector-java-2.0-14-bin to connect the database with the jsp API.My problem is when i try to transfer a file of size which is less than the possible capacity through blob ,which is 1048576 bytes ( for example when a file of size 916KB is attempted to transfer) the following error is being generated.
java.lang.IllegalArgumentException: Packet is larger than max_allowed_packet from server configuration of 1048576 bytes
at com.mysql.jdbc.Buffer.ensureCapacity(Unknown Source)
at com.mysql.jdbc.Buffer.writeBytesNoNull(Unknown Source)
at com.mysql.jdbc.PreparedStatement.executeUpdate(Unknown Source)
at com.mysql.jdbc.PreparedStatement.executeUpdate(Unknown Source)
at org.apache.jsp.file3$jsp._jspService(file3$jsp.java:110)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
at java.lang.Thread.run(Thread.java:484)
java.lang.IllegalArgumentException: Packet is larger than max_allowed_packet from server configuration of 1048576 bytes
at com.mysql.jdbc.Buffer.ensureCapacity(Unknown Source)
at com.mysql.jdbc.Buffer.writeBytesNoNull(Unknown Source)
at com.mysql.jdbc.PreparedStatement.executeUpdate(Unknown Source)
at com.mysql.jdbc.PreparedStatement.executeUpdate(Unknown Source)
at org.apache.jsp.file3$jsp._jspService(file3$jsp.java:110)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:201)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:381)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:473)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:475)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2347)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)
at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1027)
at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125)
at java.lang.Thread.run(Thread.java:484)
My uploading code in jsp is as follows.
<% try{
Class.forName("org.gjt.mm.mysql.Driver").newInstance();
Connection dbCon = DriverManager.getConnection("jdbc:mysql:///uoc");
out.println("Connection done !");
Statement stmt = dbCon.createStatement();
out.println("Statement Created !");
ResultSet rs = stmt.executeQuery("SELECT * FROM blob_test)
stmt.close();
dbCon.close();
out.println("<br><br> <b>Data Successfully selected !<b>");
} //try
catch(SQLException e){
out.println(" <br> ");
out.println("Sorry ! problem in selecting a data "+e.toString());
out.println(" <br> ");
e.printStackTrace();
%>
Please help .I thank You in advance for any help .Have you tried increasing the BLOB field greater than 1048576 or using a smaller file of say 1 or 2k as a test? There is no guarantee that the database will store the file with exactly the same size as the file on the filesystem, so the file might be more than 916k in the database.
Using BLOBs is a great way to destroy the performance of your database by the way :)
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