一個數據庫操作PHP類
<?php
/** Author 墨龍 * Time 2010年12月2日 15:50:35 */ $db = new mysql($db_host,$db_user,$db_password,$db_table,$db_conn,$pre,$coding); class mysql{ private $db_host; private $db_user; private $db_password; private $db_table; private $db_conn; //數據庫連接標識; private $result; //執行query命令的結果資源標識 private $sql; //sql執行語句 private $pre; //數據庫表前綴 private $coding; //數據庫編碼，GBK,UTF8,gb2312 function __construct($db_host,$db_user,$db_password,$db_table,$db_conn,$pre,$coding){ $this->db_host = $db_host; $this->db_user = $db_user; $this->db_password = $db_password; $this->db_table = $db_table; $this->db_conn = $db_conn; $this->pre = $pre; $this->coding = $coding; $this->connect(); } function connect(){ $this->db_conn = @mysql_connect($this->db_host,$this->db_user,$this->db_password) or die($this->show_error("數據庫鏈接錯誤,請檢查數據庫鏈接配置！")); if(!mysql_select_db($this->db_table,$this->db_conn)){ echo "沒有找到數據表：".$this->db_table; } mysql_select_db($this->db_table,$this->db_conn); $this->query("SET NAMES $this->coding"); } /*執行SQL語句的函數*/ function query($sql){ if(emptyempty($sql)){ $this->show_error("你的sql語句不能為空！"); }else{ $this->sql = $sql; } $result = mysql_query($this->sql,$this->db_conn); return $this->result = $result; } /*創建添加新的數據庫*/ public function create_database($database_name){ $database=$database_name; $sqlDatabase = 'create database '.$database; return $this->query($sqlDatabase); } // 根據select查詢結果計算結果集條數 public function db_num_rows(){ if($this->result==null){ if($this->show_error){ $this->show_error("sql語句錯誤!"); } }else{ return mysql_num_rows($this->result); } } /*查詢服務器所有數據庫*/ //將系統數據庫與用戶數據庫分開，更直觀的顯示？ public function show_databases(){ $this->query("show databases"); echo "現有數據庫：".$amount =$this->db_num_rows($rs); echo "<br />"; $i=1; while($row = $this->fetch_array($rs)){ echo "$i $row[Database]"; echo "<br />"; $i++; } } //以數組形式返回主機中所有數據庫名 public function databases() { $rsPtr=mysql_list_dbs($this->db_conn); $i=0; $cnt=mysql_num_rows($rsPtr); while($i<$cnt) { $rs[]=mysql_db_name($rsPtr,$i); $i++; } return print_r($rs); } /*查詢數據庫下所有的表*/ function show_tables($database_name){ $this->query("show tables"); echo "現有數據庫：".$amount = $this->db_num_rows($rs); echo "<br />"; $i=1; while($row = $this->fetch_array($rs)){ $columnName="Tables_in_".$database_name; echo "$i $row[$columnName]"; echo "<br />"; $i++; } } /* mysql_fetch_row() array $row[0],$row[1],$row[2] mysql_fetch_array() array $row[0] 或 $row[id] mysql_fetch_assoc() array 用$row->content 字段大小寫敏感 mysql_fetch_object() object 用$row[id],$row[content] 字段大小寫敏感 */ /*取得記錄集,獲取數組-索引和關聯,使用$row['content'] */ public function fetch_array() { return @mysql_fetch_array($this->result); } //獲取關聯數組,使用$row['字段名'] public function fetch_ass() { return @mysql_fetch_assoc($this->result); } //獲取數字索引數組,使用$row[0],$row[1],$row[2] public function fetch_row() { return @mysql_fetch_row($this->result); } //獲取對象數組,使用$row->content public function fetch_Object() { return @mysql_fetch_object($this->result); } //簡化查詢select public function findall($table){ $table = $this->fulltablename($table); $this->query("select * from $table"); } public function select($table,$columnName,$condition){ $table = $this->fulltablename($table); if(emptyempty($columnName)){ $columnName = "*"; } $this->query("SELECT $columnName FROM $table $condition"); } //簡化的insert function insert($table,$arr){ $table = $this->fulltablename($table); $sql = "INSERT INTO $table "; if(!is_array($arr)){ $this->show_error("請輸入參數數組！"); }else{ $k = ""; $v = ""; foreach($arr as $key => $value){ $k .= "`$key`,"; $v .= "'".$value."',"; } } $sql = $sql." (".substr($k,0,-1).") VALUES (".substr($v,0,-1).")"; $this->query($sql); } //簡化的update function update($table,$arr,$where){ $table = $this->fulltablename($table); $sql = "UPDATE $table SET "; if(!is_array($arr)){ $this->show_error("請輸入參數數組！"); }else{ foreach($arr as $key => $value){ $sql .= " `".$key."` = '".$value."' ,"; } } $sql = substr($sql,0,-1)." where ".$where; return $this->query($sql); } //簡化的delete function delete($table,$where = ""){ $table = $this->fulltablename($table); if(emptyempty($where)){ $this->show_error("條件不能為空!"); }else{ $where = " where ".$where; } $sql = "DELETE FROM $table ".$where; //echo $sql; return $this->query($sql); } //取得上一步 INSERT 操作產生的 ID public function insert_id(){ return mysql_insert_id(); } //加上前綴的數據表 public function fulltablename($table){ return $table = $this->pre.$table; } //查詢字段數量 public function num_fields($table){ $table = $this->fulltablename($table); $this->query("select * from $table"); echo "<br />"; echo "字段數：".$total = mysql_num_fields($this->result); echo "<pre>"; for ($i=0; $i<$total; $i++){ print_r(mysql_fetch_field($this->result,$i) ); } echo "</pre>"; echo "<br />"; } //取得 MySQL 服務器信息 public function mysql_server($num=''){ switch ($num){ case 1 : return mysql_get_server_info(); //MySQL 服務器信息 break; case 2 : return mysql_get_host_info(); //取得 MySQL 主機信息 break; case 3 : return mysql_get_client_info(); //取得 MySQL 客戶端信息 break; case 4 : return mysql_get_proto_info(); //取得 MySQL 協議信息 break; default: return mysql_get_client_info(); //默認取得mysql版本信息 } } //析構函數，自動關閉數據庫,垃圾回收機制 /*public function __destruct() { if(!empty($this->result)){ $this->free(); } mysql_close($this->$db_conn); }*/ /*獲得客戶端真實的IP地址*/ function getip(){ if(getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) { $ip = getenv("HTTP_CLIENT_IP"); } else if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")){ $ip = getenv("HTTP_X_FORWARDED_FOR"); } else if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) { $ip = getenv("REMOTE_ADDR"); } else if (isset($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown")){ $ip = $_SERVER['REMOTE_ADDR']; } else{ $ip = "unknown"; } return($ip); } function show_error($str){ echo "<script language='Javascript'> alert('".$str."');history.back(-1);</script>"; } } ?> </pre>
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