Whenever
you stored the results of a query in ResultSet object, the results
are kept in set of rows. The result set maintains a reference to the
current row called the cursor. The cursor is positioned before the
first row when a result set is created. Using next() method you can
move the cursor forward one row from its current position.
/* Step 1: Import sql package */ import java.sql.*; public class SampleApp { /* Update username, password and driver details here */ static Connection getConnection() throws ClassNotFoundException, SQLException{ /* Step 2: Load Driver */ System.out.println("Loading/Registering driver"); Class.forName("com.mysql.jdbc.Driver"); /* Step 3: Open connection to database */ System.out.println("Connecting to database"); String url = "jdbc:mysql://localhost/world"; String userName = "root"; String pasword = "tiger"; return DriverManager.getConnection(url, userName, pasword); } public static void main(String args[]) throws SQLException, ClassNotFoundException{ Connection conn = getConnection(); /* Create table employee */ String query = "CREATE TABLE employee (id int, name varchar(30), PRIMARY KEY(id))"; Statement stmt = conn.createStatement(); stmt.execute(query); /* Insert data to employee table */ query = "INSERT INTO employee values(1, \"Krishna\")"; stmt.execute(query); query = "INSERT INTO employee values(2, \"Arjun\")"; stmt.execute(query); query = "INSERT INTO employee values(3, \"Ptr\")"; stmt.execute(query); query = "SELECT * FROM employee"; ResultSet rs = stmt.executeQuery(query); while(rs.next()){ int id = rs.getInt("id"); String name = rs.getString("name"); System.out.println(id +" " + name); } System.out.println("Dropping table employee"); query = "DROP TABLE employee"; stmt.execute(query); rs.close(); stmt.close(); conn.close(); } }
Output
Loading/Registering driver Connecting to database 1 Krishna 2 Arjun 3 Ptr Dropping table employee
ResultSet
rs = stmt.executeQuery(query);
Above
statement creates a ResultSet object.
while(rs.next()){
int id =
rs.getInt("id");
String name =
rs.getString("name");
System.out.println(id +"
" + name);
}
By
using next() method, we can iterate through all the rows in the
result.
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