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Retrieving All Rows from a Database Table

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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
   sushil

Download this example.

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Posted on: April 13, 2007

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Comments
majoyeogbe
January 5, 2012
java database connection

i need a code to fetch all database content related to the type of table name u input at runtime
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