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();
}
}
}
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 |