Using Select Statements in JDBC

The SELECT statement is used to select data from a table. For terminating a statement, semicolon is used. When we want to fetch the data from any table then we have to use SELECT statement. The Query can be written as below:

SELECT * FROM employee;

This Example SelectState.java is concern with Select Statements. You have to just create the connection with database and execute the Select Statement.

SelectState.java

import java.sql.*;
public class SelectState {
          public static void main(String a[])
         {
                 Connection con = null;
                String url = "jdbc:mysql://localhost:3306/";
                String dbName = "vineej";
                String driver = "com.mysql.jdbc.Driver";
                String userName = "vineej";
                String password = "no";
               try {
                    Class.forName(driver).newInstance();
                    con = DriverManager.getConnection(url+dbName,userName,password);
                    Statement st = con.createStatement();
                    ResultSet rs = st.executeQuery("select Name from Employee");
               System.out.println("Results");
               while( rs.next() ) {
                                String data = rs.getString(1);
                                System.out.println( data );
                    }
                    st.close();
                    }
                    catch( Exception e ) {
                   System.out.println(e.getMessage());
                   e.printStackTrace();
                   }
         }
}

Description of the program
In this program, we will learn how to retrieve the data from any table with the JDBC. Employee is the name of a table and Name is one of the column of table. By the SELECT Statement we can retrieve the data.

Description of Code
1.First in the program we import the java.sql package then define the SelectState class.

import java.sql.*;

2.Create a connection with MySql database.

con = DriverManager.getConnection(url+dbName,userName,password);

3.Create statement and then execute query with the SELECT statement.

Statement st = con.createStatement();
ResultSet rs = st.executeQuery("select Name from Employee");

4.Finally got the result by the getString() method.

while( rs.next() ) {
String data = rs.getString(1);
System.out.println( data );
}

5. At the end, connection should be disconnected.

con.close();

6. printStackTrace() method

The method is used to show error messages. If there is any problem while execution then it throws the exception and prints the message.

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