PHP efficiently obtains data for pagination_PHP tutorial

mysql.php 获取数据库中的记录，完全个人经验总结，仅供参考！
/**
*PHP+MYSQL database basic functions
*http://blog.csdn.net/yown
*/
############################################
#获取序列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 $ret;
}
############################################
#获取strSql第N条记录中的第N列数据,下标从1开始
############################################
function getData($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;

}

############################################
#获取strSql第N条记录
############################################
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;

}

############################################
#获取strSql记录集存入数组中
############################################
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;
}

############################################
#执行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;
}

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

$curpage=isset($curpage)?intval($curpage):1;//当前页
$totalpage=0;//总页数
$totalrow=0;//总记录数
if($printsql) echo "

---

".$tsql."

---

";
if($curpage $curpage=1;
}

$totalrow=getData($tsql,1,1);//取得总记录数
$totalrow=strlen(totalrow)==0?0:$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);//取得当前页记录
}
if($totalrow==0||$totalrow=="0"){ $curpage=1;}

}

?>

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