queryrunner用法

声明：

public class DbHelper {

public static QueryRunner getQueryRunner() {

DataSource ds = null;

try {

Context context = new InitialContext();

ds = (DataSource) context.lookup("java:/comp/env/jdbc/mysqlds");

} catch (NamingException e) {

System.out.println("出错");

}

QueryRunner qr = new QueryRunner(ds);

return qr;

}

}

实例一：

String sql = "update users set password=? where id=?";

String params[] = { newPassword, user.getId().toString() };
QueryRunner qr = DbHelper.getQueryRunner();

try {
qr.update(sql, params);
} catch (SQLException e) {
e.printStackTrace();
}

实例二：

String sql = "select * from users where username=? and password=?";
String params[] = { username, password };
Users user = null;
List list = null;
QueryRunner qr = DbHelper.getQueryRunner();
try {
list = (List) qr.query(sql, params, new BeanListHandler(Users.class));
} catch (SQLException e) {
e.printStackTrace();
}