What are stored procedures? How to call stored procedures using JDBC program?

Stored procedures are sub routines, segment of SQL statements which are stored in SQL catalog. All the applications that can access Relational databases (Java, Python, PHP etc.), can access these procedures.

Stored procedures contain IN and OUT parameters, or both. They may return result sets in case you use SELECT statements, they can return multiple result-sets.

Example

Suppose we have a table named Dispatches in the MySQL database with the following data:

+--------------+------------------+------------------+------------------+
| Product_Name | Date_Of_Dispatch | Time_Of_Dispatch | Location         |
+--------------+------------------+------------------+------------------+
| KeyBoard     | 1970-01-19       | 08:51:36         | Hyderabad        |
| Earphones    | 1970-01-19       | 05:54:28         | Vishakhapatnam   |
| Mouse        | 1970-01-19       | 04:26:38         | Vijayawada       |
+--------------+------------------+------------------+------------------+

And if we have created a procedure named myProcedure to retrieve values from this table as shown below:

Create procedure myProcedure ()
-> BEGIN
-> SELECT * from Dispatches;
-> END //

Example

Following is a JDBC example that calls the above mentioned stored procedure using JDBC program.

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
public class CallingProcedure {
   public static void main(String args[]) throws SQLException {
      //Registering the Driver
      DriverManager.registerDriver(new com.mysql.jdbc.Driver());

      //Getting the connection
      String mysqlUrl = "jdbc:mysql://localhost/sampleDB";
      Connection con = DriverManager.getConnection(mysqlUrl, "root", "password");
      System.out.println("Connection established......");
      //Preparing a CallableStateement
      CallableStatement cstmt = con.prepareCall("{call myProcedure()}");
      //Retrieving the result
      ResultSet rs = cstmt.executeQuery();
      while(rs.next()) {
         System.out.println("Product Name: "+rs.getString("Product_Name"));
         System.out.println("Date Of Dispatch: "+rs.getDate("Date_Of_Dispatch"));
         System.out.println("Date Of Dispatch: "+rs.getTime("Time_Of_Dispatch"));
         System.out.println("Location: "+rs.getString("Location"));
         System.out.println();
      }
   }
}

Output

Connection established......
Product Name: KeyBoard
Date of Dispatch: 1970-01-19
Time of Dispatch: 08:51:36
Location: Hyderabad

Product Name: Earphones
Date of Dispatch: 1970-01-19
Time of Dispatch: 05:54:28
Location: Vishakhapatnam

Product Name: Mouse
Date of Dispatch: 1970-01-19
Time of Dispatch: 04:26:38
Location: Vijayawada