Count Rows from a Database Table

After creating a database table, if we want to know number of rows in a table then we can get it very easily by using the simple database query.

Count Rows from a Database Table

Count Rows from a Database Table

     

After creating a database table, if we want to know number of rows in a table then we can get it very easily by using the simple database query. See brief description below:

Description of program:

For this program to work firstly we need to establish the connection with MySQL database by the help of JDBC driver. When the connection has been established we need to pass a table name from the given database in the query and the rows will be counted and the result will be displayed. If any exception is thrown then it will show "SQL statement is not executed!"

Description of code:

SELECT COUNT(*) FROM table_name;
This code is used to count the rows of given table.
  table_name: It is a name of the table of which we want to see the rows.

Here is the code of program:

import java.io.*;
import java.sql.*;

public class CountRows{
  public static void main(String[] args) {
  System.out.println("Count number of rows in a specific table!");
  Connection con = null;
  int count = 0;
  try{
  Class.forName("com.mysql.jdbc.Driver");
  con = DriverManager.getConnection
("jdbc:mysql://localhost:3306/jdbctutorial","root","root");
  try{
  Statement st = con.createStatement();
  BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  System.out.println("Enter table name:");
  String table = bf.readLine();
  ResultSet res = st.executeQuery("SELECT COUNT(*) FROM "+table);
  while (res.next()){
  count = res.getInt(1);
  }
  System.out.println("Number of column:"+count);
  }
  catch (SQLException s){
  System.out.println("SQL statement is not executed!");
  }
  }
  catch (Exception e){
  e.printStackTrace();
  }
  }
} 

Download this example.

output of program:

C:\vinod\jdbc\jdbc\jdbc-mysql>javac CountRows.java

C:\vinod\jdbc\jdbc\jdbc-mysql>java CountRows
Count number of rows in a specific table!
Enter table name:
student
Number of column:6

Tutorials

  1. Mapping MySQL Data Types in Java
  2. Connecting to a MySQL Database in Java
  3. Creating a Database in MySQL
  4. Creating a Database Table
  5. Creating a MySQL Database Table to store Java Types
  6. Description of Database Table
  7. Deleting a Table from Database
  8. Retrieving Tables from a Database
  9. Inserting values in MySQL database table
  10. Retrieving All Rows from a Database Table
  11. Adding a New Column Name in Database Table
  12. Change Column Name of a Table
  13. Make Unique Column in Database Table
  14. Remove Unique Column in Database Table
  15. Arrange a Column of Database Table
  16. Arrange a Column of Database Table
  17. Sum of Column in a Database Table
  18. Deleting All Rows from a Database Table
  19. Delete a Specific Row from a Database Table
  20. Delete a Column from a Database Table
  21. Join tables in the specific database
  22. Join tables with the NATURAL LEFT JOIN operation
  23. Join tables with the NATURAL RIGHT JOIN operation
  24. Cross Join Tables in a Specific Database
  25. Prepared Statement Set Object
  26. Statement Batch Update
  27. Prepared Statement With Batch Update
  28. Select Records Using Prepared Statement
  29. Update Records using Prepared Statement
  30. Inserting Records using the Prepared Statement
  31. Count Records using the Prepared Statement
  32. Deleting Records using the Prepared Statement
  33. Using the Prepared Statement Twice
  34. Set Data Types by using Prepared Statement
  35. Set byte, short and long data types by using the Prepared Statement
  36. Prepared Statement Set Big Decimal
  37. Set Date by using the Prepared Statement
  38. Set Time by using the Prepared Statement
  39. Set Timestamp by using the Prepared Statement
  40. Copy Table in a MySQL Database