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discuz db 类
<?php /** * by mckee & www.phpddt.com * modified by discuz DB */
class Mysql{
private $host; //主机名 private $username; //用户名 private $password; //密码 private $dbname; //数据库名 private $conn; //链接资源 private $pconnect; //是否持久连接 private $charset; //数据库编码 public $histories; //保存执行的sql语句 public $querynum = 0; //查询的次数 //构造函数,初始化时连接数据库 public function __construct($host, $username, $password, $dbname, $charset, $pconnect = 0){ $this->host = $host; $this->username = $username; $this->password = $password; $this->dbname = $dbname; $this->charset = $charset; if($pconnect){ if(!$this->conn = mysql_pconnect($this->host,$this->username,$this->password)){ $this->halt(‘Cannot connect to mysql‘); } }else{ if(!$this->conn = mysql_connect($this->host,$this->username,$this->password)){ $this->halt(‘Cannot connect to mysql‘); } } mysql_select_db($this->dbname); mysql_query("SET NAMES {$this->charset}"); } //使用mysql_unbuffered_query不会使用缓冲区,但是它也有缺点,比如你不能使用mysql_num_rows来取得它结果的数量。 function query($sql, $type = ‘‘, $cachetime = FALSE) { $func = $type == ‘UNBUFFERED‘ && @function_exists(‘mysql_unbuffered_query‘) ? ‘mysql_unbuffered_query‘ : ‘mysql_query‘; if(!($query = $func($sql, $this->conn)) && $type != ‘SILENT‘) { $this->halt(‘MySQL Query Error‘, $sql); } $this->querynum++; $this->histories[] = $sql; return $query; }
//默认返回关联数组 public function fetch_array($query, $result_type = MYSQL_ASSOC) { return mysql_fetch_array($query, $result_type); }
//返回第一行第一列 function result_first($sql) { $query = $this->query($sql); return $this->result($query, 0); }
//返回第一行数据 function fetch_first($sql) { $query = $this->query($sql); return $this->fetch_array($query); }
function fetch_all($sql, $id = ‘‘) { $arr = array(); $query = $this->query($sql); while($data = http://www.mamicode.com/$this->fetch_array($query)) {>
function error() { return (($this->conn) ? mysql_error($this->conn) : mysql_error()); }
function errno() { return intval(($this->conn) ? mysql_errno($this->conn) : mysql_errno()); }
function result($query, $row) { $query = @mysql_result($query, $row); return $query; }
function num_rows($query) { $query = mysql_num_rows($query); return $query; } //返回字段的数目 function num_fields($query) { return mysql_num_fields($query); }
function free_result($query) { return mysql_free_result($query); } //如果 AUTO_INCREMENT 的列的类型是 BIGINT,则 mysql_insert_id() 返回的值将不正确,但是可以用LAST_INSERT_ID() 来替代 function insert_id() { return ($id = mysql_insert_id($this->conn)) >= 0 ? $id : $this->result($this->query("SELECT last_insert_id()"), 0); } function fetch_row($query) { $query = mysql_fetch_row($query); return $query; } //取得列信息 function fetch_fields($query) { return mysql_fetch_field($query); }
function version() { return mysql_get_server_info($this->conn); }
function close() { return mysql_close($this->conn); } //中断提示 public function halt($message = ‘‘, $sql = ‘‘){ $error = mysql_error(); $errorno = mysql_errno(); $s = ‘‘; if($message) { $s = "<b>Error info:</b> $message<br />"; } if($sql) { $s .= ‘<b>SQL:</b>‘.htmlspecialchars($sql).‘<br />‘; } $s .= ‘<b>Error:</b>‘.$error.‘<br />‘; $s .= ‘<b>Errno:</b>‘.$errorno.‘<br />‘; exit($s); }}
?>discuz db 类
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