Php efficient data retrieval page

Php efficiently retrieves data by page. mysql. php retrieves records from the database. this is a summary of my personal experience and is for your reference only!
/**
* Basic functions of PHP + MYSQL databases
* Http://blog.csdn.net/yown
*/
######################################## ####
# Obtain the sequence ID
######################################## ####
Function getSequence (){
$ SQL = "update sequence set id = last_insert_id (id + 1 );";
$ Sql2 = "select last_insert_id ();";

Global $ dbuser, $ dbpass, $ host, $ database, $ printsql;

$ Link = mysql_connect ($ host, $ dbuser, $ dbpass );
If (! $ Link ){
Return mysql_error ();
}

Mysql_select_db ($ database );
Mysql_query ("set names UTF8 ");
If ($ printsql) echo" ". $ SQL ." ";
Mysql_query ($ SQL );
If ($ printsql) echo" ". $ Sql2 ." ";
$ Result = mysql_query ($ sql2 );

If (mysql_num_rows ($ result) = 0 ){
Mysql_close ($ link );
Return "";
}
$ Myrow = mysql_fetch_row ($ result );
$ Ret = $ myrow [0];

Mysql_close ($ link );
Return $ ret;
}
######################################## ####
# Obtain the data in column N of the Nth record of strSql. the subscript starts from 1.
######################################## ####
Function getData ($ strsql, $ row, $ col ){
Global $ dbuser, $ dbpass, $ host, $ database, $ printsql;

$ Link = mysql_connect ($ host, $ dbuser, $ dbpass );
If (! $ Link ){
Return mysql_error ();
}

Mysql_select_db ($ database );
Mysql_query ("set names UTF8 ");
If ($ printsql) echo" ". $ Strsql ." ";
$ Result = mysql_query ($ strsql );

If (mysql_num_rows ($ result) = 0 ){
Mysql_close ($ link );
Return "";
}
$ I = 0;
While ($ myrow = mysql_fetch_row ($ result )){

If ($ I = $ row-1 ){
$ Ret = $ myrow [$ col-1];
Break;
}
$ I = $ I + 1;
}

Mysql_close ($ link );
Return $ ret;

}

######################################## ####
# Obtain the Nth record of strSql
######################################## ####
Function getRowData ($ strsql, $ row ){
Global $ dbuser, $ dbpass, $ host, $ database, $ printsql;

$ Link = mysql_connect ($ host, $ dbuser, $ dbpass );
If (! $ Link ){
Return mysql_error ();
}

Mysql_select_db ($ database );
Mysql_query ("set names UTF8 ");
If ($ printsql) echo" ". $ Strsql ." ";
$ Result = mysql_query ($ strsql );

If (mysql_num_rows ($ result) = 0 ){
Mysql_close ($ link );
Return "";
}
$ I = 0;
While ($ myrow = mysql_fetch_array ($ result )){

If ($ I = $ row-1 ){
$ Ret = $ myrow;
Break;
}
$ I = $ I + 1;
}

Mysql_close ($ link );
Return $ ret;

}

######################################## ####
# Getting strSql record set and saving it to the array
######################################## ####
Function getResultSetData ($ strsql ){
Global $ dbuser, $ dbpass, $ host, $ database, $ printsql;

$ Link = mysql_connect ($ host, $ dbuser, $ dbpass );
If (! $ Link ){
Return mysql_error ();
}

Mysql_select_db ($ database );
Mysql_query ("set names UTF8 ");
If ($ printsql) echo" ". $ Strsql ." ";
$ Result = mysql_query ($ strsql );

If (mysql_num_rows ($ result) = 0 ){
Mysql_close ($ link );
Return "";
}

While ($ myrow = mysql_fetch_array ($ result )){
$ Ret [] = $ myrow;
}

Mysql_close ($ link );
Return $ ret;
}

######################################## ####
# Execute strSql
######################################## ####
Function executeSql ($ strsql ){
Global $ dbuser, $ dbpass, $ host, $ database, $ printsql;

$ Link = mysql_connect ($ host, $ dbuser, $ dbpass );
If (! $ Link ){
Return mysql_error ();
}

Mysql_select_db ($ database );
Mysql_query ("set names UTF8 ");
If ($ printsql) echo" ". $ Strsql ." ";
Mysql_query ($ strsql );
$ Ret = mysql_affected_rows ($ link );
Mysql_close ($ link );
Return $ ret;
}

/*
Paging
*/
Function Pager (& $ curpage, & $ pagesize, & $ tsql, & $ psql, & $ totalpage, & $ totalrow, & $ pagerset ){

$ Curpage = isset ($ curpage )? Intval ($ curpage): 1; // current page
$ Totalpage = 0; // total number of pages
$ Totalrow = 0; // total number of records
If ($ printsql) echo" ". $ Tsql ." ";
If ($ curpage <= 0 ){
$ Curpage = 1;
}

$ Totalrow = getData ($ tsql,); // get the total number of records
$ Totalrow = strlen (totalrow) = 0? 0: $ totalrow;
If ($ totalrow> 0 ){
$ Totalpage = $ totalrow % $ pagesize = 0? (Int) ($ totalrow/$ pagesize) :( int) ($ totalrow/$ pagesize) + 1;
If ($ curpage> $ totalpage ){
$ Curpage = 1;
}

$ Psql = $ psql. "limit". ($ curpage-1) * $ pagesize). ",". $ pagesize;
If ($ printsql) echo" ". $ Psql ." ";
$ Pagerset = getResultSetData ($ psql); // get the current page record
}
If ($ totalrow = 0 | $ totalrow = "0") {$ curpage = 1 ;}

}

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