How to retrive all the rows in a mysql database and write it to a file using java?

[asenthil]

Hai to all,,

i had to tried to retrive and write a single row to a file from the database..

But dont know to write all the retrived rows to a file from the database..

how to do that...

here are my codings for writing a single row to a file...

import java.io.*;
import java.sql.*;
 
public class DataBase {
 
  public static void main(String args[]) {
String Driver;
Statement stmt; 
ResultSet rs; 
 
Driver = "com.mysql.jdbc.Driver";
Connection con = null;
try {
File file = new File("C:/test.txt");
BufferedWriter out = new BufferedWriter(new FileWriter(file));
Class.forName(Driver);
con = DriverManager.getConnection("jdbc:mysql://192.168.0.01/senthil","root","");
      if(!con.isCloses)
{
System.out.println("Successfully connected to MySQL DataBase \n");
               stmt = con.createStatement(); 
rs = stmt.executeQuery("SELECT * FROM employees");
InputStream data= null;
System.out.println("Display all results: "); 
               while (rs.next()) { 
                  int id = rs.getInt("Employee_Number");
      String name = rs.getString("First_Name"); 
                  String addr = rs.getString("Second_Name");
     data = rs.getBinaryStream(1);
                 int temp=0;
                 while( (temp = data.read()) != -1) {         
     out.write(temp);        }                  
                System.out.println( id + name + addr);   
                   } 
 
                 out.flush();   
     out.close(); 
 
      }
 
    } catch(Exception e) {
      System.err.println("Exception: " + e.getMessage());
    } finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
    }
  }
}

Can any one plzz help me soon...

thanks and regards..
senthil

[r035198x]

Hai to all,,

i had to tried to retrive and write a single row to a file from the database..

But dont know to write all the retrived rows to a file from the database..

how to do that...

here are my codings for writing a single row to a file...

import java.io.*;
import java.sql.*;
 
public class DataBase {
 
public static void main(String args[]) {
String Driver;
Statement stmt; 
ResultSet rs; 
 
Driver = "com.mysql.jdbc.Driver";
Connection con = null;
try {
File file = new File("C:/test.txt");
BufferedWriter out = new BufferedWriter(new FileWriter(file));
Class.forName(Driver);
con = DriverManager.getConnection("jdbc:mysql://192.168.0.01/senthil","root","");
if(!con.isCloses)
{
System.out.println("Successfully connected to MySQL DataBase \n");
stmt = con.createStatement(); 
rs = stmt.executeQuery("SELECT * FROM employees");
InputStream data= null;
System.out.println("Display all results: "); 
while (rs.next()) { 
int id = rs.getInt("Employee_Number");
     String name = rs.getString("First_Name"); 
String addr = rs.getString("Second_Name");
     data = rs.getBinaryStream(1);
int temp=0;
while( (temp = data.read()) != -1) { 
     out.write(temp); } 
System.out.println( id + name + addr); 
} 
 
out.flush(); 
     out.close(); 
 
     }
 
} catch(Exception e) {
System.err.println("Exception: " + e.getMessage());
} finally {
try {
if(con != null)
con.close();
} catch(SQLException e) {}
}
}
}

Can any one plzz help me soon...

thanks and regards..
senthil

Just try this while loop

 while (rs.next()) { 
      int id = rs.getInt("Employee_Number");
      out.write(id);
      String name = rs.getString("First_Name"); 
      out.write(name);         
      String addr = rs.getString("Second_Name");
      out.write(addr);
 }
 

[asenthil]

Just try this while loop

 while (rs.next()) { 
      int id = rs.getInt("Employee_Number");
      out.write(id);
      String name = rs.getString("First_Name"); 
      out.write(name);         
      String addr = rs.getString("Second_Name");
      out.write(addr);
 }
 

Hai ro35...

thanks for ur reply...

now its writing the data to the file...

But itz not writing the Employee_Number to the file...

the output is like the follwing in the text file..

? Axel Washington
? Arvid Sharma
? Jonas Ginsberg
? Florence Wojokowski
? Sean Washington
?Elizabeth Yamaguchi

its sucessfully writing the two strings but itz not writing the integer id...

what to do for this?

thanks.
senthil.

[r035198x]

Hai ro35...

thanks for ur reply...

now its writing the data to the file...

But itz not writing the Employee_Number to the file...

the output is like the follwing in the text file..

? Axel Washington
? Arvid Sharma
? Jonas Ginsberg
? Florence Wojokowski
? Sean Washington
?Elizabeth Yamaguchi

its sucessfully writing the two strings but itz not writing the integer id...

what to do for this?

thanks.
senthil.

try out.write(""+id);
also print the id to the console to make sure you're getting the id right from the database.
And you can call me r035198x rather than ro35, r0, or the rest of those variants.

[asenthil]

Hai r035198x...

Very very thanks for ur reply...

Now itz working perfectly...

i'm a beginner to java, jsp...

Now i'm learning hardly to work in java...

can u plzz tell me...

what are the main concepts i have to study in java

to do projects in jsp...

thanks
senthil.

[hirak1984]

Well why do we need to write it this way?please explain.

try out.write(""+id);
.

[asenthil]

Ya i'm also want the reason for hirak's question...

plzz explain us.. r035198x....

thanks.
senthil.

[r035198x]

Hai r035198x...

Very very thanks for ur reply...

Now itz working perfectly...

i'm a beginner to java, jsp...

Now i'm learning hardly to work in java...

can u plzz tell me...

what are the main concepts i have to study in java

to do projects in jsp...

thanks
senthil.

Depends really on what you want to do with JSP. If you just want to master it, you can start by making small interesting programs with it. Just trying to come up with some nice system that involves one or two other technologies as well and you'll learn quite a lot about them that way.

[r035198x]

Ya i'm also want the reason for hirak's question...

plzz explain us.. r035198x....

thanks.
senthil.

id is an int. Calling write(id) calls a method
different from calling write(""+id); because the second one calls a method that takes a String as argument is more suited for presentation that the first method.

[asenthil]

ya okay,

now itz cleared...

thanks for ur support and responses...

senthil.