A class connecting odbc to mssql paging

A class connecting odbc to mssql paging
Class Pages {
Var $ cn; // database connection cursor
Var $ d; // The cursor connecting to the data table
Var $ result; // result
Var $ dsn; // dsn source
Var $ user; // user name
Var $ pass; // password

Var $ total; // The total number of records.
Var $ pages; // The total number of pages.
Var $ onepage; // number of entries per page
Var $ page; // current page
Var $ fre; // Previous Page
Var $ net; // Next page
Var $ I; // control the display of each page

Function getConnect ($ dsn, $ user, $ pass ){
$ This-> cn = @ odbc_connect ($ dsn, $ user, $ pass );
If (! $ This-> cn ){
$ Error = "database connection error ";
$ This-> getMess ($ error );
}
}

Function getDo ($ SQL) {// query data from the table
$ This-> d = @ odbc_do ($ this-> cn, $ SQL );
If (! $ This-> d ){
$ Error = "a small error occurred while querying ......";
$ This-> getMess ($ error );
}
Return $ this-> d;
}

Function getTotal ($ SQL ){
$ This-> SQL = $ SQL;
$ DT = $ this-> getDo ($ this-> SQL); // calculates the cursor of the total number.
$ This-> total = odbc_result ($ dT, 'total'); // why can't we $ this-> d here?
Return $ this-> total;
}

Function getList ($ SQL, $ onepage, $ page ){
$ This-> s = $ SQL;
$ This-> onepage = $ onepage;
$ This-> page = $ page;
$ This-> dList = $ this-> getDo ($ this-> s); // connects the table cursor
$ This-> pages = ceil ($ this-> total/$ this-> onepage );
If ($ this-> pages = 0)
$ This-> pages ++; // you cannot obtain page 0th.
If (! Isset ($ this-> page ))
$ This-> page = 1;
$ This-> fre = $ this-> page-1; // Number of pages to be displayed
$ This-> nxt = $ this-> page + 1;
$ This-> nums = ($ this-> page-1) * $ this-> onepage;
// If ($ this-> nums! = 0 ){
// For ($ this-> I = 0; $ this-> I <$ pg-> getNums (); odbc_fetch_row ($ this-> dd ), $ this-> I ++); // same as above
//}
// $ This-> I = 0; // why cannot this part be encapsulated?
Return $ this-> dList;
}

Function getFanye (){
$ Str = "";
If ($ this-> page! = 1)
$ Str. = "homepage fre."> Previous Page ";
Else
$ Str. = "front page of the home page ";
If ($ this-> page <$ this-> pages)
$ Str. = "nxt."> BACK page ";
Else
$ Str. = "back page ";
If ($ this-> page! = $ This-> pages)
$ Str. = "pages."> last page ";
Else
$ Str. = "Last page ";

$ Str. = "total". $ this-> pages. "page ";
$ Str. = "you are browsing the page". $ this-> page. "page ";
Return $ str;
}

Function getNums (){
Return $ this-> nums;
}

Function getOnepage () {// actual number of entries per page
Return $ this-> onepage;
}

Function getI (){
Return $ this-> I;
}

Function getPage (){
Return $ this-> page;
}

Function getMess ($ error) {// custom message
Echo" $ Error ";
Exit;
}
}

$ Pg = new Pages ();
$ Pg-> getConnect ("lei", "sa", "star ");
$ Pg-> getTotal ("select count (*) as total from xs"); // calculates the total number of connected student tables
$ Pg-> getList ("select xs_name from xs order by xs_id", 8, $ page );
If ($ pg-> getNums ()! = 0 ){
For ($ I = 0; $ I <$ pg-> getNums (); odbc_fetch_row ($ pg-> dList), $ I ++); // same as above
}
$ I = 0;
While (odbc_fetch_row ($ pg-> dList )){
$ Name = odbc_result ($ pg-> dList, "xs_name ");
Echo $ name ."
";
If ($ I = $ pg-> getOnepage () {// jump out of the loop
Break;
}
$ I ++;
}
Echo $ pg-> getFanye ();
?>