Mysql Database Access Class _mysql

/**
* @Purpose: MySQL Database access class
* @Package:
* @Author: lisen@sellingclub.cn
* @Modifications:
* @See:
* @Time: 2008.10.10
*/
Class Db_mysql
{
//============================================================
Private $Host = ' localhost ';
Private $Database = ' db_name ';
Private $User = ' User ';
Private $Password = ' Password ';
//============================================================
Private $Link _id = 0; Database connection
Private $Query _id = 0; Query results
Private $Row _result = Array (); An array of result sets
Private $Field _result = Array (); Array of result set fields
Private $Affected _rows; Number of rows affected
Private $Rows; Number of rows recorded in the result set
Private $Fields; Number of fields in result set
Private $Row _postion = 0; Index of record pointer location
Public $Insert _id = 0;
//************************************************************
/**** Constructor ****/
function __construct ()
{
$this->connect ();
}
/**** destructor ****/
function __destruct ()
{
@mysql_free_result ($this->query_id);
Mysql_close ($this->link_id);
}
/**** connection server, select Database ****/
Function Connect ($Database = ', $Host = ', $User = ', $Password = ')
{
$Database = $Database = = ""? $this->database: $Database;
$Host = $Host = = ""? $this->host: $Host;
$User = $User = = ""? $this->user: $User;
$Password = $Password = = ""? $this->password: $Password;
//-----------------------------------------------------------//
if (0 = = $this->link_id)
{
$this->link_id = @mysql_pconnect ($Host, $User, $Password);
if (! $this->link_id)
{
$this->halt (' Connect database server failed! ');
}
if (!mysql_select_db ($this->database, $this->link_id))
{
$this->halt (' cannot open the specified database: '. $this->database);
}
}
return $this->link_id;
}
/**** Free Memory ****/
function free ()
{
if (@mysql_free_result ($this->query_id))
{
unset ($this->row_result);
}
$this->query_id = 0;
}
/**** Execute Query ****/
function query ($Query _string)
{
Free Last query memory
if ($this->query_id)
{
$this->free ();
}
if (0 = = $this->link_id)
{
$this->connect ();
}
Set Chinese Character set
@mysql_query (' Set names gb2312 ');
$this->query_id = mysql_query ($Query _string, $this->link_id);
$this->insert_id = mysql_insert_id ();
if (! $this->query_id)
{
$this->halt (' SQL query statement error: '. $Query _string);
}
@mysql_query (' Set names gb2312 ');
return $this->query_id;
}
/**** points The result set pointer to the specified row ****/
function Seek ($pos)
{
if (@mysql_data_seek ($this->query_id, $pos))
{
$this->row_position = $pos;
return true;
}
Else
{
$this->halt (' Locating result set has error! ');
return false;
}
}
/**** returns an array of result sets ****/
function Get_rows_array ()
{
$this->get_rows ();
for ($i = 0; $i < $this->rows; $i + +)
{
if (!mysql_data_seek ($this->query_id, $i))
{
$this->halt (' Mysql_data_seek query Error! ');
}
$this->row_result[$i] = mysql_fetch_array ($this->query_id);
}
return $this->row_result;
}
/**** returns an array of result set fields ****/
function Get_fields_array ()
{
$this->get_fields ();
for ($i = 0; $i < $this->fields; $i + +)
{
$obj = Mysql_fetch_field ($this->query_id, $i);
$this->field_result[$i] = $obj->name;
}
return $this->field_result;
}
/**** returns the number of impact records ****/
function Get_affected_rows ()
{
$this->affected_rows = mysql_affected_rows ($this->link_id);
return $this->affected_rows;
}
/**** returns the number of records in the result set ****/
function Get_rows ()
{
$this->rows = mysql_num_rows ($this->query_id);
return $this->rows;
}
/**** returns the number of fields in the result set ****/
function Get_fields ()
{
$this->fields = mysql_num_fields ($this->query_id);
return $this->fields;
}
/**** executes the SQL statement and returns an array of the first row of records in the query result ****/
function Fetch_one_array ($sql)
{@mysql_query (' Set names gb2312 ');
$this->query ($sql);
Return mysql_fetch_array ($this->query_id);
}
/**** Print error message ****/
function Halt ($msg)
{
$this->error = Mysql_error ();
printf ("<font style= ' font-family:arial, song body; font-size:12px; > <b> Database error:</b>%s \ n ", $msg);
printf ("MySQL returns error message:</b>%s \ n", $this->error);
printf ("error page: <font style= ' color: #0000EE; text-decoration:underline ' >%s</font> \ \", $_server[' php_self ') ]);
printf ("Please submit the error message to the system administrator or Web site programmer to handle it!") \ n ");
Die (' <b><font color=red> script termination </font></b></font> ');
}
}