public static void main(String[] args)
throws SQLException, ClassNotFoundException, JSONException {
PostgresDb db = new PostgresDb();
// db.setUrl("jdbc:postgresql://localhost:5432/powaaim");
try {
Class.forName("org.postgresql.Driver");
c = DriverManager.getConnection(db.getUrl(), db.getUser(), db.getPass());
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
st = c.createStatement();
rs = st.executeQuery("SELECT id, name, externalshopid from shop where name='David_3'");
System.out.println("id" + " " + "name" + " " + "externalshopid");
c.close();
obj = new JSONObject();
while (rs.next()) {
int id = rs.getInt("id");
String externaId = rs.getString("externalshopid");
String name = rs.getString("name");
// System.out.println(id+ " " + " "+ name + " " +" "+ externaId);
System.out.println();
obj.put("id", id);
obj.put("name", name);
obj.put("externalshopid", externaId);
System.out.print(obj);
}
}
public Connection createConnection() throws Exception {
Connection con;
try {
Class.forName(dbClass);
con = DriverManager.getConnection(dbUrl, dbUser, dbPassword);
} catch (Exception e) {
e.printStackTrace();
throw e;
}
return con;
}
/**
* Establece una conexión con la base de datos, usando el usuario y clave especificados. Si ya hay
* una conexi�n, esta es cerrada.
*
* @param usuario Una cadena con el nombre de usuario
* @param clave Una cadena con la clave
* @return Regresa verdadero (true) si pudo establecer la conexión de lo contrario regresa falso
* (false).
*/
protected boolean conectar(String usuario, String clave) throws Exception {
// Registra el controlador de manera implicita
Class.forName(controlador).newInstance();
// Obtiene la conexión
System.err.println(url + "," + usuario + "," + clave + ":OK!!!");
this.conexión = DriverManager.getConnection(url, usuario, clave);
// Actualiza usuario y clave del middler
this.usuario = usuario;
this.clave = clave;
return this.conexión != null;
} // Fin conectar
public static Connection getConnect() {
try {
/*if (!getConnect) {
if (!con.isValid(1)) {*/
String host = "jdbc:mysql://localhost:3306/2761DB";
String uname = "root";
String upassword = "******";
con = DriverManager.getConnection(host, uname, upassword);
getConnect = true;
/*}
}*/
} catch (SQLException err) {
System.out.println(err.getMessage());
}
return con;
}
public CachedRowSet query(String sql, int pageSize, int page) throws Exception {
// 加载驱动
Class.forName(driver);
try (
// 获取数据库连接
Connection conn = DriverManager.getConnection(url, user, pass);
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery(sql)) {
// 使用RowSetProvider创建RowSetFactory
RowSetFactory factory = RowSetProvider.newFactory();
// 创建默认的CachedRowSet实例
CachedRowSet cachedRs = factory.createCachedRowSet();
// 设置每页显示pageSize条记录
cachedRs.setPageSize(pageSize);
// 使用ResultSet装填RowSet，设置从第几条记录开始
cachedRs.populate(rs, (page - 1) * pageSize + 1);
return cachedRs;
}
}
public static void main(String[] args) {
Connection con = null;
Statement stat = null;
String s;
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
// con=DriverManager.getConnection("jdbc:oracle:oci8:@oracle9i","scott","tiger");
//
// con=DriverManager.getConnection("jdbc:oracle:thin:@saraswati:1521:oracle10g","scott","tiger");
con = DriverManager.getConnection("jdbc:oracle:thin:@//localhost:1521/XE", "scott", "tiger");
/*Properties p=new Properties();
p.put("user","scott");
p.put("password","tiger");*/
// Driver d=(Driver)Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
// Connection con=d.connect("jdbc:odbc:oradsn",p);
// Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// con=DriverManager.getConnection("jdbc:odbc:namadsn","scott","tiger");
System.out.println("The connection is successful.");
} catch (Exception e) {
e.printStackTrace();
}
try {
stat = con.createStatement();
s = "create table student(Rollno int,Name varchar2(50),serName varchar2(50))";
stat.executeUpdate(s);
} catch (SQLException e) {
e.printStackTrace();
}
try {
stat = con.createStatement();
s = "insert into student values(1,'Namrata','Marathe')";
stat.executeUpdate(s);
s = "insert into student values(2,'Arjun','Marathe')";
stat.executeUpdate(s);
s = "insert into student values(3,'Rahul','Marathe')";
stat.executeUpdate(s);
} catch (SQLException e) {
e.printStackTrace();
}
try {
stat.close();
} catch (SQLException e) {
}
System.out.println("create is successful:");
try {
stat = con.createStatement();
s = "select * from student";
ResultSet rset = stat.executeQuery(s);
while (rset.next())
System.out.println(rset.getInt(1) + " " + rset.getString(2) + " " + rset.getString(3));
} catch (SQLException e) {
e.printStackTrace();
}
try {
stat.close();
} catch (SQLException se) {
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
server svr = new server();
response.setContentType("text/html");
HttpSession session = request.getSession(true);
PrintWriter out = response.getWriter();
String email = request.getParameter("email");
String pw1 = request.getParameter("pw1");
String pw2 = request.getParameter("pw2");
String error = null;
String username = session.getAttribute("username").toString();
if (pw1.compareTo(pw2) != 0) {
error = "Passwords do not match";
session.setAttribute("ErrorMessage", error);
response.sendRedirect("home.jsp");
}
try {
Statement st = null;
String strQuery = null;
if ((pw1.length() == 0) && (email.length() == 0)) {
session.setAttribute("ErrorMessage", "Nothing to change!");
response.sendRedirect("home.jsp");
} else if ((pw1.length() != 0) && (email.length() != 0)) {
strQuery =
"UPDATE `twitter2012`.`users` SET `password`='"
+ pw1
+ "', `email_address`='"
+ email
+ "' WHERE `username`='"
+ username
+ "'";
session.setAttribute("email", email);
} else if ((pw1.length() == 0) && (email.length() != 0)) {
strQuery =
"UPDATE `twitter2012`.`users` SET `email_address`='"
+ email
+ "' WHERE `username`='"
+ username
+ "'";
session.setAttribute("email", email);
} else if ((pw1.length() != 0) && (email.length() == 0)) {
strQuery =
"UPDATE `twitter2012`.`users` SET `password`='"
+ pw1
+ "' WHERE `username`='"
+ username
+ "'";
}
Connection dbcon = null;
Class.forName("com.mysql.jdbc.Driver").newInstance();
dbcon = DriverManager.getConnection(svr.getURL(), svr.getUN(), svr.getPW());
st = dbcon.createStatement();
st.executeUpdate(strQuery);
session.setAttribute("ErrorMessage", "Details Changed");
dbcon.close();
session.setAttribute("ErrorMessage", "Details Changed");
response.sendRedirect("home.jsp");
} catch (Exception ex) {
out.println(ex);
}
}