Display MySQL table values using Java

For this, you can use the ResultSet concept. For connection, we will be using the MySQL JDBC Driver.

Let us create a table −

Example

mysql> create table demo87
   -> (
   -> name varchar(20),
   -> age int
   -> )
   -> ;
Query OK, 0 rows affected (0.62

Insert some records into the table with the help of insert command −

Example

mysql> insert into demo87 values('John',21);
Query OK, 1 row affected (0.15

mysql> insert into demo87 values('David',23);
Query OK, 1 row affected (0.12

mysql> insert into demo87 values('Bob',22);
Query OK, 1 row affected (0.16

Display records from the table using select statement −

Example

mysql> select *from demo87;

This will produce the following output −

Output

+-------+------+
| name  | age  |
+-------+------+
| John  |   21 |
| David |   23 |
| Bob   |   22 |
+-------+------+
3 rows in set (0.00 sec)

Following is the Java code to display table values in MySQL −

Example

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.util.ArrayList;
import java.util.HashMap;

import com.mysql.jdbc.Statement;

public class TableValuesDemo {
   public static void main(String[] args) {
      Connection con = null;
      Statement statement = null;
      try {
         HashMap hm = new HashMap<>();
         Class.forName("com.mysql.jdbc.Driver");
         con = DriverManager.getConnection("jdbc:mysql://localhost:3306/sampledatabase", "root", "123456");
         statement = (Statement) con.createStatement();
         String sql;
         sql = "select *from demo87";
         ResultSet resultSet = statement.executeQuery(sql);
         while (resultSet.next()) {
         hm.put(resultSet.getString("name"), resultSet.getInt("age"));
      }
      System.out.println(hm);

      } catch (Exception e) {
         e.printStackTrace();
      }
   }
}

This will produce the following output −

Output

{Bob=22, John=21, David=23}

Following is the snapshot of sample output −