PHP MySQL Classic database connection class Code _php tutorial

function MySQL Tutorial connector (): Constructors for classes, defining and containing configuration information
function Connectmysql (): Open Database Tutorial Connection
function Close (): Close database connection
function Returnsql ($sql): Executes a statement that returns an array of rows
function ExecuteSQL ($sql): Executes a query to return success
function Returndb ($sql): Execute query, return data set
function Selectlimit ($sql, $offset _b, $offset _n=0)
: Paging query, returning dataset parameters (SQL statement, start position, number of rows read)
function Datearray ($sql, $startid, $endid)
: Paged query, returns two-dimensional array parameters (SQL statement, start position, read row count)
function GetArray ($sql): Executes a query of two fields, returns an array of format array[row["0"]]=>row["1"]


*/

Class Mysqlconnector
{
/* Public: Database connection parameters */
var $dbhost; Server address
var $dbname; Database name
var $dbusername; Connect account
var $dbpassword; Connection password
var $setnames; Database encoding

function Mysqlconnector ()//constructor, Database link configuration
{
$this->dbname = "Xixia";
$this->dbhost = "localhost";
$this->dbusername = "root";
$this->dbpassword = "123456";
$this->setnames= "GBK";
}

function Connectmysql ()//Link database, return active connection
{
$openconn = Mysql_pconnect ($this->dbhost, $this->dbusername, $this->dbpassword) or Die ("Connect database error, check configuration!");
mysql_query ("Set Names"). $this->setnames. "'", $openconn);
mysql_select_db ($this->dbname, $openconn);
return $openconn;
}

/*
*
* Executes a query statement that returns an array of rows
*/

function Returnsql ($sql)
{
$array _result= "";

Mysql_unbuffered_query
$db _result=mysql_query ($sql, $this->connectmysql ());
if ($db _result) {
$array _result=mysql_fetch_array ($db _result);
}
Mysql_free_result ($db _result); Release recordset
return $array _result;

}

/*
*
* Execute Query statement, return data
*
*/

function Returndb ($sql)
{
$db _result=mysql_query ($sql, $this->connectmysql ());
return $db _result;

}

/*
*
* Executes the query statement, returns an array of two columns, primarily for the drop-down box, the previous column is values, and the next column is option
*
*/

function GetArray ($sql)
{
$array _result=array ();

$db _result=mysql_query ($sql, $this->connectmysql ());
if ($db _result) {
while ($row =mysql_fetch_row ($db _result))
{
$array _result[$row [0]]= $row [1];
}
}

return $array _result;

}

/*
*
* Executes an SQL statement that returns whether execution succeeded
*
*/

function ExecuteSQL ($sql)
{
$sql = Str_replace ("", "\", $sql);
$result =mysql_query ($sql, $this->connectmysql ());
if (! $result) {
echo " ";
return false;
}else{
return true;
}
}

/*

Reads the SQL statement in a page, returns a set of records,
Parameters are SQL statement, start line number, read number of bars (when passing 2, the number of rows is the number of read bars)
*/

function Selectlimit ($sql, $offset _b, $offset _n=0)
{

$result = "";
$this->checklink ($sql);
if (! $offset _n) {
$limit = "Limit". $offset _b;
}else{
$limit = "Limit". $offset _b. ",". $offset _n;
}
$sql. = $limit;
echo "
";
Echo $sql;

$result = $this->returndb ($sql);
return $result;
}

/*
*
* Convert datasets to an array
*
*/
function Datearray ($sql, $startid, $endid)
{
$array _result=array ();
$db _result= $this->selectlimit ($sql, $startid, $endid); reading datasets based on SQL statements

if ($db _result) {//DataSet exists
$i = 0;
while ($row =mysql_fetch_row ($db _result))//loop-fill Array
{
$array _result[$i]= $row;
$i + +;
}
}

return $array _result;

}

/*
*
* Close Link
*
*/
function Close ()
{
if ($this->linkid!=null)
{
Mysql_close ($this->linkid);
Unset ($this);
}
}

}
/*

* Use case:
$conn = new Mysqlconnector (); Instantiation of
$db = & $conn;

$db->returnsql ($sql)//Execute Query

*/

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