Php mssql database connection class instance

This article mainly introduces the mssql database connection class of php, and demonstrates various common operations of PHP for mssql databases in the form of a class instance, this includes database connection, addition, deletion, modification, query, and other operations, which are of great practical value. if you need it, you can refer to the following example to describe the php mssql database connection instance code, share it with you for your reference.

The specific implementation code is as follows:

The code is as follows:

Class DB_ SQL {
Var $ Host = "";
Var $ Database = "";
Var $ User = "";
Var $ Password = "";
Var $ Link_ID = 0;
Var $ Query_ID = 0;
Var $ Record = array ();
Var $ Row = 0;

Var $ Errno = 0;
Var $ Error = "";
Var $ Auto_Free = 0; # set this to 1 to automatically free results

Function DB_ SQL ($ query = ""){
$ This-> query ($ query );
}
Function connect (){
If (0 = $ this-> Link_ID ){
$ This-> Link_ID = mssql_connect ($ this-> Host, $ this-> User, $ this-> Password );
If (! $ This-> Link_ID)
$ This-> halt ("Link-ID = false, mssql_pconnect failed ");
Else
@ Mssql_select_db ($ this-> Database, $ this-> Link_ID );
}
}
Function free_result (){
Mssql_free_result ($ this-> Query_ID );
$ This-> Query_ID = 0;
}

Function query ($ Query_String)
{

/* No empty queries, please, since PHP4 chokes on them .*/
If ($ Query_String = "")
/* The empty query string is passed on from the constructor,
* When calling the class without a query, e.g. in situations
* Like these: '$ db = new DB_ SQL _Subclass ;'
*/
Return 0;
If (! $ This-> Link_ID)
$ This-> connect ();

# Printf ("
Debug: query = % s
", $ Query_String );

$ This-> Query_ID = mssql_query ($ Query_String, $ this-> Link_ID );
$ This-> Row = 0;
If (! $ This-> Query_ID ){
$ This-> Errno = 1;
$ This-> Error = "General Error (The MSSQL interface cannot return detailed error messages ).";
$ This-> halt ("Invalid SQL:". $ Query_String );
}
Return $ this-> Query_ID;
}

Function next_record (){

If ($ this-> Record = mssql_fetch_row ($ this-> Query_ID )){
// Add to Record [ ]
$ Count = mssql_num_fields ($ this-> Query_ID );
For ($ I = 0; $ I <$ count; $ I ++ ){
$ Fieldinfo = mssql_fetch_field ($ this-> Query_ID, $ I );
$ This-> Record [strtolower ($ fieldinfo-> name)] = $ this-> Record [$ I];
}
$ This-> Row + = 1;
$ Stat = 1;
} Else {
If ($ this-> Auto_Free ){
$ This-> free_result ();
}
$ Stat = 0;
}
Return $ stat;
}

Function seek ($ pos ){
Mssql_data_seek ($ this-> Query_ID, $ pos );
$ This-> Row = $ pos;
}
Function metadata ($ table ){
$ Count = 0;
$ Id = 0;
$ Res = array ();
$ This-> connect ();
$ Id = mssql_query ("select * from $ table", $ this-> Link_ID );
If (! $ Id ){
$ This-> Errno = 1;
$ This-> Error = "General Error (The MSSQL interface cannot return detailed error messages ).";
$ This-> halt ("Metadata query failed .");
}
$ Count = mssql_num_fields ($ id );

For ($ I = 0; $ I <$ count; $ I ++ ){
$ Info = mssql_fetch_field ($ id, $ I );
$ Res [$ I] ["table"] = $ table;
$ Res [$ I] ["name"] = $ info ["name"];
$ Res [$ I] ["len"] = $ info ["max_length"];
$ Res [$ I] ["flags"] = $ info ["numeric"];
}
$ This-> free_result ();
Return $ res;
}

Function affected_rows (){
// Not a supported function in PHP3/4. Chris Johnson, 16May2001.
// Return mssql_affected_rows ($ this-> Query_ID );
$ RsRows = mssql_query ("Select @ rowcount as rows", $ this-> Link_ID );
If ($ rsRows ){
Return mssql_result ($ rsRows, 0, "rows ");
}
}

Function num_rows (){
Return mssql_num_rows ($ this-> Query_ID );
}

Function num_fields (){
Return mssql_num_fields ($ this-> Query_ID );
}
Function nf (){
Return $ this-> num_rows ();
}

Function np (){
Print $ this-> num_rows ();
}

Function f ($ Field_Name ){
Return $ this-> Record [strtolower ($ Field_Name)];
}

Function p ($ Field_Name ){
Print $ this-> f ($ Field_Name );
}

Function halt ($ msg ){
Printf (" Database error:% S
", $ Msg );
Printf (" MSSQL Error: % S (% s)
",
$ This-> Errno,
$ This-> Error );
Die ("Session halted .");
}
}

I hope this article will help you with PHP programming.