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Retrieving All Rows from a Database Table
Posted on: April 13, 2007 at 12:00 AM

Here, you will learn how to retrieve all rows from a database table. You know that table contains the data in rows and columns format.

Retrieving All Rows from a Database Table

Here, you will learn how to retrieve all rows from a database table. You know that table contains the data in rows and columns format. If you want to access the data from a table then you need to use some APIs and methods. See brief descriptions for retrieving all rows from a database table as below:

Description of program:

Program establishes the connection between MySQL database and java file so that the we can retrieve all data from a specific database table. If any exception occurs then shows a message "SQL code does not execute.".

Description of code:

executeQuery(String sql):
This method executes the SQL statement and returns a single ResultSet object. It takes string type parameter for executing the SQL statement.

SELECT * FROM table_name:
Above code retrieves all data from specific database table.

getInt(String column_name):
This method is of java.sql.ResultSet interface that takes string type parameter and returns an integer type values.

getString(String column_name):
This method is same as getInt() method but it returns the string type values.

Here is the code of program:


import java.sql.*;



public class GetAllRows{

  public static void main(String[] args) {

  System.out.println("Getting All Rows from a table!");

  Connection con = null;

  String url = "jdbc:mysql://localhost:3306/";

  String db = "jdbctutorial";

  String driver = "com.mysql.jdbc.Driver";

  String user = "root";

  String pass = "root";

  try{

  Class.forName(driver).newInstance();

  con = DriverManager.getConnection(url+db, user, pass);

  try{

  Statement st = con.createStatement();

  ResultSet res = st.executeQuery("SELECT * FROM  employee6");

  System.out.println("Emp_code: " + "\t" + "Emp_name: ");

  while (res.next()) {

  int i = res.getInt("Emp_code");

  String s = res.getString("Emp_name");

  System.out.println(i + "\t\t" + s);

  }

  con.close();

  }

  catch (SQLException s){

  System.out.println("SQL code does not execute.");

  }  

  }

  catch (Exception e){

  e.printStackTrace();

  }

  }

}

Output of program:

C:\vinod\jdbc\jdbc-mysql>java GetAllRows
Getting All Rows from a table!
Emp_code: Emp_name:
10 vinod
11 Amar
15 Aman
1 sushil

Download this example.

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