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Count Records using the Prepared Statement

                         

In this section we will learn how to count all records of the database table by using the PreparedStatement interface of  java.sql package. As we know that table keeps the records in tabular format like: rows and columns. A table has one or more records. If you will know that how many records in a database table then you get easily with the help of given program in RoseIndia.Net JDBC tutorial. See detailed information below:

Description of program:

This program helps us for counting the records of database table by using the PreparedStatement. For this, firstly we will establish the connection with MySQL database by using the JDBC driver. When connection has been established it takes a table name of database, only after that it will count the records of database table with the help of executeQuery method that returns a single ResultSet object and displays the number of records, otherwise it will show the message "SQL statement is not executed!".

Here is the code of program:

import java.io.*;
import java.sql.*;

public class CountRecords{
  public static void main(String[] args) {
    System.out.println("Count records example using prepared statement!");
    Connection con = null;
    int records = 0;
    try{
      Class.forName("com.mysql.jdbc.Driver");
      con = DriverManager.getConnection
(
"jdbc:mysql://localhost:3306/jdbctutorial","root","root");
      try{
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter table name:");
        String table = bf.readLine();
        String sql = "SELECT COUNT(*) FROM "+table;
        PreparedStatement prest = con.prepareStatement(sql);
        ResultSet rs = prest.executeQuery();
        while (rs.next()){
          records = rs.getInt(1);
        }
        System.out.println("Number of records: " + records);
        con.close();
      }
      catch (SQLException s){
        System.out.println("Table does not exist in the database!");
      }
    }
    catch (Exception e){
      e.printStackTrace();
    }
  }
}

Download this example.

Database Table: movies

title year_made
alam ara 1945
Sanam We wafafa 2005
Sanam We wafafa 2005
Bagal bali 2002
Diwar 1980
Nadia ke par 1975
Karan 1996
Ramayan 1966
Yarana 1988
Muhabte 1998

Output of program:

C:\vinod\jdbc\jdbc\PreparedStatement>javac CountRecords.java

C:\vinod\jdbc\jdbc\PreparedStatement>java CountRecords
Count records example using prepared statement!
Enter table name:
movies
Number of records: 10

                         

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