private static final String DRIVERNAME="oracle.jdbc.driver.OracleDriver";
private static final String NAME="he";
private static final String PASSWORD="he";
private Connection conn;
public Connection getConn(){
try{
if(conn==null){
Class.forName(DRIVERNAME);
conn=DriverManager.getConnection(URL, NAME, PASSWORD);
}
return conn;
}
catch(Exception e){
return null;
}
}
public void closeConn(ResultSet rs, PreparedStatement ps,Connection conn){
try {
if(rs!=null){rs.close();}
if(ps!=null){ps.close();}
if(conn!=null){conn.close();}
} catch (SQLException e) {
e.printStackTrace();
}
}
-------------------------------------------------------------------------------------=======------------------------------------------------------------
Connection conn=null;
PreparedStatement ps=null;
ResultSet rs=null;
public User log(String name) {
conn =getConn();
System.out.println(conn);
StringBuffer sb =new StringBuffer();
sb.append(" select * from UserTable ");
sb.append(" where NAME = ?");
try{
ps= conn.prepareStatement(sb.toString());
ps.setString(1, name);
rs=ps.executeQuery();
User user = null;
while(rs.next()){
user =new User();
System.out.println("999999999"+rs.getInt("id"));
user.setId(rs.getInt("id"));
user.setName(rs.getString("name"));
user.setPassword(rs.getString("password"));
user.setE_mail(rs.getString("E_MAIL"));
}
return user;
}catch(Exception e){
System.out.println(e+"？？？？");
return null;
}finally{
super.closeConn(rs, ps, conn);
}
}
public List<User> getInfo() {
conn =getConn();
StringBuffer sb =new StringBuffer();
sb.append(" select * from UserTable ");
try{
ps=conn.prepareStatement(sb.toString());
rs= ps.executeQuery();
List<User> list =new ArrayList<User>();
User us=null;
while(rs.next()){
us=new User();
us.setId( rs.getInt("id"));
us.setName(rs.getString("NAME"));
us.setPassword(rs.getString("password"));
us.setE_mail(rs.getString("E_MAIL"));
list.add(us);
}
return list;
}catch(Exception e){
return null;
}finally{
super.closeConn(rs, ps, conn);
}
}
public boolean update(User us) {
conn =getConn();
boolean judge=false;
StringBuffer sb =new StringBuffer();
sb.append(" update UserTable set ");
if(!us.getName().isEmpty()&&us.getName()!=null&&us.getPassword().isEmpty()&&us.getPassword()==null){
System.out.println("用戶爲空");
sb.append("name = ?");
}
if(!us.getPassword().isEmpty()&&us.getPassword()!=null&&us.getName().isEmpty()&&us.getName()==null){
sb.append("password = ?");
System.out.println("密碼爲空");
}
if(!us.getPassword().isEmpty()&&us.getPassword()!=null&&!us.getPassword().isEmpty()&&us.getPassword()!=null){
sb.append(" name = ? , ");
sb.append(" password = ?");
System.out.println("2者都不爲空");
}
try {
ps=conn.prepareStatement(sb.toString());
if(!us.getName().isEmpty()&&us.getName()!=null&&us.getPassword().isEmpty()&&us.getPassword()==null){
ps.setString(1,us.getName());
System.out.println("用戶爲空");
}
if(!us.getPassword().isEmpty()&&us.getPassword()!=null&&us.getName().isEmpty()&&us.getName()==null){
ps.setString(1, us.getPassword());
System.out.println("密碼爲空");
}
if(!us.getPassword().isEmpty()&&us.getPassword()!=null&&!us.getPassword().isEmpty()&&us.getPassword()!=null){
ps.setString(1, us.getName());
ps.setString(2, us.getPassword());
System.out.println("2者都不爲空");
}
int i=ps.executeUpdate();
if(i>0){
judge=true;
}
} catch (SQLException e) {
e.printStackTrace();
judge= false;
}finally{
super.closeConn(rs, ps, conn);
}
return judge;
}
public boolean delete(int id) {
boolean judge=false;
conn =getConn();
StringBuffer sb =new StringBuffer();
sb.append("delete from UserTable where id=?");
try {
ps=conn.prepareStatement(sb.toString());
ps.setInt(1, id);
int i = ps.executeUpdate();
if(i>0){
judge=true;
}
} catch (SQLException e) {
e.printStackTrace();
judge=false;
}
return judge;
}
public boolean insert(User us) {
boolean judge=false;
conn =getConn();
StringBuffer sb =new StringBuffer();
sb.append("insert into UserTable values(user_ids.nextval,?,?,?)");
try {
ps=conn.prepareStatement(sb.toString());
ps.setString(1, us.getName());
ps.setString(2, us.getPassword());
ps.setString(3, us.getE_mail());
int i = ps.executeUpdate();
if(i>0){
judge=true;
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
judge=false;
}
return judge;
}
}
<meta http-equiv="refresh" content="0;url=showLogin_showUser">
<constant name="struts.i18n.encoding" value="utf-8"/>