Original PHP database operations

Original PHP database operations // This is a tool class to complete database operations;
Class SqlHelper {
Public $ conn;
Public $ dbname = "exam ";
Public $ username = "root ";
Public $ password = "123 ";
Public $ host = "192.168.1.100 ";

// Constructor (connect to the database );
Public function _ construct (){
$ This-> conn = mysql_connect ($ this-> host, $ this-> username, $ this-> password );
If (! $ This-> conn ){
Die ("connection failed". mysql_errno ());
}

// Set the character encoding;
Mysql_set_charset ('utf8 ');
Mysql_select_db ($ this-> dbname, $ this-> conn );
}

// Execute the dql statement
Public function execute_dql ($ SQL ){
$ Res = mysql_query ($ SQL, $ this-> conn) or die (mysql_errno ());
Return $ res;
}

// Execute the dql statement, but an array is returned
Public function execute_dql2 ($ SQL ){
$ Arr = array ();
$ Res = mysql_query ($ SQL, $ this-> conn) or die (mysql_errno ());
$ I = 0;
// Give $ res to $ arr
While ($ row = mysql_fetch_array ($ res )){
$ Arr [$ I] = $ row;
$ I ++;
}
// Close it immediately;
Mysql_free_result ($ res );
Return $ arr;
}


// Execute the dml statement
Public function execute_dml ($ SQL ){
$ B = mysql_query ($ SQL, $ this-> conn) or die (mysql_errno ());
If (! $ B ){
Return 0;
} Else {
If (mysql_affected_rows ($ this-> conn)> 0 ){
Return 1; // indicates that the execution is successful only.
} Else {
Return 2; // indicates that no row is affected;
}
}
}


// Encapsulation
// Queries with paging considerations
// $ SQL = "select * from where table name limit 0, 6 ";
// $ SQL = "select count (*) from table name ";
Public function execute_dql_fenye ($ sql1, $ sql2, $ fenyePage ){
// Obtain the paging data
$ Res = mysql_query ($ sql1, $ this-> conn) or die (mysql_errno ());
// $ Res => array ();
// Transfers data to an array
$ Arr = array ();
While ($ row = mysql_fetch_assoc ($ res )){
$ Arr [] = $ row;
}
// Release resources
Mysql_free_result ($ res );
// Assign an array to $ fenyePage
$ FenyePage-> res_array = $ arr;

$ Res2 = mysql_query ($ sql2, $ this-> conn) or die (mysql_errno ());
If ($ row = mysql_fetch_row ($ res2 )){
$ FenyePage-> pageCount = ceil ($ row [0]/$ fenyePage-> pageSize );
$ FenyePage-> rowCount = $ row [0];
}
Mysql_free_result ($ res2 );

// Encapsulate the navigation information in $ fenyePage;

// Display the previous and next pages
$ Navigate = "";
If ($ fenyePage-> pageNow> 1 ){
$ PrePage = $ fenyePage-> pageNow-1;
$ Navigate = "gotoUrl }? PageNow = $ prePage '> Previous Page ";
}
If ($ fenyePage-> pageNow <$ fenyePage-> pageCount ){
$ NextPage = $ fenyePage-> pageNow + 1;
$ Navigate. = "gotoUrl }? PageNow = $ nextPage '> next page ";
}

// Display the home page and last page
$ Navigate. = "gotoUrl }? PageNow = 1'> homepage ";
$ Navigate. = "gotoUrl }? PageNow = $ fenyePage-> pageCount '> last page ";

// Display the current page and total number of pages
$ Navigate. = "current page {$ fenyePage-> pageNow}/total {$ fenyePage-> pageCount} page ";



// How many pages are displayed below
$ Page_whole = 2;
$ Start = floor ($ fenyePage-> pageNow-1)/$ page_whole) * $ page_whole + 1;
$ Index = $ start;
$ Min = floor ($ fenyePage-> pageCount-1)/$ page_whole) * $ page_whole;
// Flip the entire page forward;
// If the current pageNow is within 10, no page flip occurs;
If ($ fenyePage-> pageNow> $ page_whole ){
$ Navigate. = "gotoUrl }? PageNow = ". ($ start-1)." '> <";
}

// How to define start (1 to 10) (floor (pageNow-1)/10) * 10 + 1; (11 to 20) (floor (pageNow-1/10) * 10 + 1
If ($ fenyePage-> pageNow <= $ min ){
For ($ start; $ start <$ index + $ page_whole; $ start ++ ){
$ Navigate. = "gotoUrl }? PageNow = $ start'> [$ start] ";
}
} Else {
For ($ start; $ start <= $ fenyePage-> pageCount; $ start ++ ){
$ Navigate. = "gotoUrl }? PageNow = $ start'> [$ start] ";
}
}

// Page flip
// Flip the page to display the condition;
//
// $ Min = floor ($ pageCount-1/$ page_whole)
//
// If ($ pageNow <= $ min * $ pagewhole)
//
If ($ fenyePage-> pageNow <= $ min ){
$ Navigate. = "gotoUrl }? PageNow = $ start '>>> ";
}


$ FenyePage-> navigate = $ navigate;
}

// Close the connection
Public function close_connect (){
If (! Empty ($ this-> conn )){
Mysql_close ($ this-> conn );
}
}
}
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