Problem in Displaying the Mysql data in Browser using Jsp

**r035198x** · Nov 13 '08, 07:36 AM

Get the text into a string then use the replaceAll method to replace all \n with .
Careful with your regex for matching \n. You need four \ to match one \.

**xtremebass** · Nov 13 '08, 09:56 AM

thanks for reply..
actually the problem is ,

database -table -record is to be updated through linux, from where some text file has to be created and shell script is executed for storing the text file to database as record in single field.after storing the text file it has to be retrieved in browser using Jsp program.

so how i can replace the \n to tag when i dont have a \n in my text file. i really confused.

database table data shown

| total: used: free: shared: buffers: cached:
Mem: 515952640 510210048 5742592 0 2199552 118583296
Swap: 1077469184 572231680 505237504
MemTotal: 503860 kB
MemFree: 5608 kB
MemShared: 0 kB
Buffers: 2148 kB
Cached: 62224 kB
SwapCached: 53580 kB
Active: 382952 kB
ActiveAnon: 354608 kB
ActiveCache: 28344 kB
Inact_dirty: 72288 kB
Inact_laundry: 14928 kB
Inact_clean: 6720 kB
Inact_target: 95376 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 503860 kB
LowFree: 5608 kB
SwapTotal: 1052216 kB
SwapFree: 493396 kB
HugePages_Total : 0
HugePages_Free: 0
Hugepagesize: 4096 kB |

1 row in set (0.44 sec)

code attached

Code:

<%@ page import="java.sql.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="javax.servlet.http.*" %>

<%
ResultSet rs=null;
Connection con =null;
 %>

<html>
<head>
<h3>Sample Database Reterival</h3></head>
<table><tr><th>Memory Information</th></tr>

<body>

<%
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://192.168.1.8:3306/test","root","prastsys");
Statement st=con.createStatement();
rs=st.executeQuery("select * from charchk");
while(rs.next())
{
String mem=rs.getString(1);
%>

<tr>
<td>
<%
out.println(mem);
%>
<br>
</td>
<br>
</tr>
<%
}
%>
</table>
<%
}
catch(Exception e)
{
out.println(e);
}
%>

</body>
</html>

output from browser:

Sample Database Reterival

Memory Information
total: used: free: shared: buffers: cached:
Mem: 515952640 510210048 5742592 0 2199552 118583296 Swap: 1077469184 572231680 505237504
MemTotal: 503860 kB MemFree: 5608 kB MemShared: 0 kB Buffers: 2148 kB Cached: 62224 kB SwapCached: 53580 kB
Active: 382952 kB ActiveAnon: 354608 kB ActiveCache:
28344 kB Inact_dirty: 72288 kB Inact_laundry: 14928
kB Inact_clean: 6720 kB Inact_target: 95376 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 503860 kB LowFree: 5608 kB SwapTotal:
1052216 kB SwapFree: 493396 kB HugePages_Total : 0 HugePages_Free: 0 Hugepagesize: 4096 kB

--

this is what the output displayed in browser. there is no order /alignment has done when displayed but mysql shows the contents by one by one line in order .. so please tel me some detailed solution for this..

Thank you

**r035198x** · Nov 13 '08, 10:12 AM

1.) Better remove all that database connection code from the JSP. The JSP must only get the results and display them.
2.) Did you try passing that string to a replaceAll method like I suggested?

**xtremebass** · Nov 13 '08, 11:32 AM

Originally posted by r035198x

1.) Better remove all that database connection code from the JSP. The JSP must only get the results and display them.
2.) Did you try passing that string to a replaceAll method like I suggested?

i dont know how pass the string to replace all method that you would suggested?
i dont have '\n' in my text file or a string i have,then how can i use replace all method to convert \n to tag?
help me.

**r035198x** · Nov 13 '08, 11:48 AM

[CODE=java]String mem=rs.getStrin g(1);
mem = mem.replaceAll( "\\\\n","");[/CODE]

**xtremebass** · Nov 14 '08, 04:15 AM

Originally posted by r035198x

[CODE=java]String mem=rs.getStrin g(1);
mem = mem.replaceAll( "\\\\n","");[/CODE]

still i am not get the required output after applying the replaceAll method that you would suggested . is there any other solution for this problem?

**r035198x** · Nov 14 '08, 07:13 AM

Can you post the code you used?

**xtremebass** · Nov 14 '08, 09:24 AM

Originally posted by r035198x

Can you post the code you used?

Here is the code i used.

Code:

<%@ page import="java.sql.*" %>
<%@ page import="javax.servlet.*" %>
<%@ page import="javax.sql.*" %>
<%@ page import="javax.servlet.http.*" %>

<%
ResultSet rs=null;
Connection con =null;
 %>

<html>
<head>
<h3>Sample Database Reterival</h3></head>
<!--<table><tr><th>Memory Information</th></tr>-->

<body>

<%
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://192.168.1.8:3306/test","root","prastsys");
Statement st=con.createStatement();
rs=st.executeQuery("select * from charchk");
while(rs.next())
{
 String mem=rs.getString(1);
 mem = mem.replaceAll("\\\\n","<BR />");

out.println(mem);
%>
<br>

<%
}

}
catch(Exception e)
{
out.println(e);
}
%>
</body>
</html>

**r035198x** · Nov 14 '08, 09:28 AM

What if you wrap the string in <pre> </pre> tags?

P.S You really should not be connecting to databases in JSP code.

**xtremebass** · Nov 14 '08, 09:46 AM

Originally posted by r035198x

What if you wrap the string in <pre> </pre> tags?

P.S You really should not be connecting to databases in JSP code.

I really i dont know what to proceed next? i think you are saying that dont use Jsp code for DB connection isn't it? then tell me how i can overcome this problem..can u give me an idea for this problem or any other alternative or how to proceed further??

**r035198x** · Nov 14 '08, 09:54 AM

Basically mixing Java code and HTML is a bad idea and should be kept to a bare minimum. Doing so creates lots of maintenance headaches and makes your application slower. All the Java code should be in Servlets and utility classes. The JSP must only be concerned with getting results from those classes and displaying that data.

P.S Did you try the pre tags on the text?

P.PS How did you decide that the data is well formatted in the database? Did you run a select from the command line or similar?

**xtremebass** · Nov 14 '08, 10:49 AM

i didnt use/try the [pre] tag in text.

you asked that, how did i decided Mysql table is well formatted?
for that i checked Mysql table using select query.

results showw like this,

mysql> select * from charchk;

| memory |
------------------------------------------------------------------------
| total: used: free: shared: buffers: cached:
Mem: 515952640 510210048 5742592 0 2199552 118583296
Swap: 1077469184 572231680 505237504
MemTotal: 503860 kB
MemFree: 5608 kB
MemShared: 0 kB
Buffers: 2148 kB
Cached: 62224 kB
SwapCached: 53580 kB
Active: 382952 kB
ActiveAnon: 354608 kB
ActiveCache: 28344 kB
Inact_dirty: 72288 kB
Inact_laundry: 14928 kB
Inact_clean: 6720 kB
Inact_target: 95376 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 503860 kB
LowFree: 5608 kB
SwapTotal: 1052216 kB
SwapFree: 493396 kB
HugePages_Total : 0
HugePages_Free: 0
Hugepagesize: 4096 kB |

---------------------------------------------
so that i decided it is well formatted .. or tell me my thought is wrong with reason. actually i am not storing the value to that filed directly. fFom linux i have inserted record .

**r035198x** · Nov 14 '08, 10:58 AM

So you are trying to display many rows line by line rather than one formatted row?
Your break tag is not correct in your JSP. Make that instead.

Problem in Displaying the Mysql data in Browser using Jsp

Problem in Displaying the Mysql data in Browser using Jsp

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