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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