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How to count rows – count (*) and Java
The SQL Count() function returns the number of rows in a table. Using this you can get the number of rows in a table.
select count(*) from TABLE_NAME;
Let us create a table with name cricketers_data in MySQL database using CREATE statement as shown below −
CREATE TABLE cricketers_data( First_Name VARCHAR(255), Last_Name VARCHAR(255), Date_Of_Birth date, Place_Of_Birth VARCHAR(255), Country VARCHAR(255), );
Now, we will insert 5 records in cricketers_data table using INSERT statements −
insert into cricketers_data values('Shikhar', 'Dhawan', DATE('1981-12-05'), 'Delhi', 'India');
insert into cricketers_data values('Jonathan', 'Trott', DATE('1981-04-22'), 'CapeTown', 'SouthAfrica');
insert into cricketers_data values('Kumara', 'Sangakkara', DATE('1977-10-27'), 'Matale', 'Srilanka');
insert into cricketers_data values('Virat', 'Kohli', DATE('1988-11-05'), 'Delhi', 'India');
insert into cricketers_data values('Rohit', 'Sharma', DATE('1987-04-30'), 'Nagpur', 'India');Following JDBC program establishes connection with MySQL and displays the number of rows in the table named cricketers_data.
Example
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class Count_Example {
public static void main(String args[]) throws Exception {
//Registering the Driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
//Getting the connection
String mysqlUrl = "jdbc:mysql://localhost/mydatabase";
Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
System.out.println("Connection established......");
//Creating the Statement object
Statement stmt = con.createStatement();
//Query to get the number of rows in a table
String query = "select count(*) from Cricketers_Data";
//Executing the query
ResultSet rs = stmt.executeQuery(query);
//Retrieving the result
rs.next();
int count = rs.getInt(1);
System.out.println("Number of records in the cricketers_data table: "+count);
}
}Output
Connection established...... Number of records in the cricketers_data table: 5
Updated on: 30-Jul-2019
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