Połączenie z HR

PC23-BazyDanych/src/main/java/zajecia/OdczytajEmployees1.java

+package zajecia;
+
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+
+public class OdczytajEmployees1 {
+
+	public static void main(String[] args) {
+		String url = "jdbc:postgresql://localhost/hr";
+		try {
+			Connection c = DriverManager.getConnection(url, "kurs", "abc123");
+			System.out.println("Udało się połączyć. c = " + c);
+			
+			Statement stmt = c.createStatement();
+			ResultSet rs = stmt.executeQuery("SELECT * FROM employees");
+			while(rs.next()) {
+				String imie = rs.getString("first_name");
+				String nazwisko = rs.getString("last_name");
+				String job = rs.getString("job_id");
+				BigDecimal salary = rs.getBigDecimal("salary");
+				System.out.printf("%s %s (%s) zarabia %s\n", imie, nazwisko, job, salary);
+			}
+			rs.close();
+			stmt.close();
+			c.close();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+}

PC23-BazyDanych/src/main/java/zajecia/OdczytajEmployees2.java

+package zajecia;
+
+import java.math.BigDecimal;
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+
+public class OdczytajEmployees2 {
+
+	public static void main(String[] args) {
+		String url = "jdbc:postgresql://localhost/hr";
+		try(Connection c = DriverManager.getConnection(url, "kurs", "abc123");
+			PreparedStatement stmt = c.prepareStatement("SELECT * FROM employees");
+			ResultSet rs = stmt.executeQuery())
+		{
+			while(rs.next()) {
+				String imie = rs.getString("first_name");
+				String nazwisko = rs.getString("last_name");
+				String job = rs.getString("job_id");
+				BigDecimal salary = rs.getBigDecimal("salary");
+				System.out.printf("%s %s (%s) zarabia %s\n", imie, nazwisko, job, salary);
+			}
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+	}
+
+}