表和数据：
CREATE TABLE weather (city varchar(80),temp_lo int, -- low temperaturetemp_hi int, -- high temperatureprcp real, -- average temperaturedate date
);insert into weather values ('Wuhan', 15, 30, 25.5, '2010-09-21');
insert into weather values ('Beijing', 10, 22, 15.3, '2010-09-22');
insert into weather values ('Shanghai', 17, 35, 28.6, '2010-09-22');
insert into weather values ('Guangzhou', 30, 36, 32.7, '2010-09-22');
insert into weather values ('Xiamen', 24, 32, 30.3, '2010-09-22');
public class TestConnPostgreSQL {public static void main(String[] args) {try {Class.forName("org.postgresql.Driver").newInstance();String url = "jdbc:postgresql://localhost:5432/testdb";Connection conn = DriverManager.getConnection(url, "postgres", "postgres");Statement st = conn.createStatement();String sql = "select * from weather";ResultSet rs = st.executeQuery(sql);while(rs.next()){System.out.print( rs.getString("city") + "\t");System.out.print( rs.getString("temp_lo") + "\t");System.out.print( rs.getString("temp_hi") + "\t");System.out.print( rs.getString("prcp") + "\t");System.out.println( rs.getString("date"));}rs.close();st.close();conn.close();} catch (Exception e) {e.printStackTrace();}}
}
