/* * filename:mysql数据库连接类 */ class mysql{ private $db_host; //数据库主机 private $db_user; //数据库用户名 private $db_pwd; //数据库用户名密码 private $db_database; //数据库名 private $conn; //数据库连接标识; private $result; //执行query命令的结果资源标识 private $sql; //sql执行语句 private $row; //返回的条目数 private $coding; //数据库编码,GBK,UTF8,gb2312 private $bulletin = true; //是否开启错误记录 private $show_error = true; //测试阶段,显示所有错误,具有安全隐患,默认关闭 private $is_error = false; //发现错误是否立即终止,默认true,建议不启用,因为当有问题时用户什么也看不到是很苦恼的 /*构造函数*/ public function __construct($db_host,$db_user,$db_pwd,$db_database,$conn,$coding){ $this->db_host=$db_host; $this->db_user=$db_user; $this->db_pwd = $db_pwd; $this->db_database=$db_database; $this->conn=$conn; $this->coding=$coding; $this->connect(); } /*数据库连接*/ public function connect() { if($this->conn=="pconn"){ //永久链接 $this->conn=mysql_pconnect($this->db_host,$this->db_user,$this->db_pwd); }else{ //即时链接 $this->conn=mysql_connect($this->db_host,$this->db_user,$this->db_pwd); } if(!mysql_select_db($this->db_database,$this->conn)){ if($this->show_error){ $this->show_error("数据库不可用:",$this->db_database); } } mysql_query("SET NAMES $this->coding"); } /*数据库执行语句,可执行查询添加修改删除等任何sql语句*/ public function query($sql) { if($sql == ""){ $this->show_error("sql语句错误:","sql查询语句为空");} $this->sql = $sql; $result = mysql_query($this->sql,$this->conn); if(!$result){ //调试中使用,sql语句出错时会自动打印出来 if($this->show_error){ $this->show_error("错误sql语句:",$this->sql); } }else{ $this->result = $result; } return $this->result; } /*创建添加新的数据库*/ public function create_database($database_name){ $database=$database_name; $sqlDatabase = 'create database '.$database; $this->query($sqlDatabase); } /*查询服务器所有数据库*/ //将系统数据库与用户数据库分开,更直观的显示? public function show_databases(){ $rs=$this->query("show databases"); echo "现有数据库:".$amount =$this->db_num_rows($rs); echo " "; $i=1; while($row = $this->fetch_array($rs)){ echo "$i $row[Database]"; echo " "; $i++; } } //以数组形式返回主机中所有数据库名 public function databases() { $rsPtr=mysql_list_dbs($this->conn); $i=0; $cnt=mysql_num_rows($rsPtr); while($i { $rs[]=mysql_db_name($rsPtr,$i); $i++; } return $rs; } /*查询数据库下所有的表*/ function show_tables($database_name){ $this->query("show tables"); echo "现有数据库:".$amount = $this->db_num_rows($rs); echo " "; $i=1; while($row = $this->fetch_array($rs)){ $columnName="Tables_in_".$database_name; echo "$i $row[$columnName]"; echo " "; $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 字段大小写敏感 mysql_fetch_object() object 用$row[id],$row[content] 字段大小写敏感 */ /*取得结果数据*/ public function mysql_result_li() { return mysql_result($str); } /*取得记录集,获取数组-索引和关联,使用$row['content'] */ public function fetch_array() { return mysql_fetch_array($this->result); } //获取关联数组,使用$row['字段名'] public function fetch_assoc() { return mysql_fetch_assoc($this->result); } //获取数字索引数组,使用$row[0],$row[1],$row[2] public function fetch_row() { return mysql_fetch_row($this->result); } //获取对象数组,使用$row->content public function fetch_Object() { return mysql_fetch_object($this->result); } //简化查询select public function findall($table) { $this->query("SELECT * FROM $table"); } //简化查询select public function select($table,$columnName,$condition) { if($columnName==""){ $columnName="*"; } $this->query("SELECT $columnName FROM $table $condition"); } //简化删除del public function delete($table,$condition){ $this->query("DELETE FROM $table WHERE $condition"); } //简化插入insert public function insert($table,$columnName,$value){ $this->query("INSERT INTO $table ($columnName) VALUES ($value)"); } //简化修改update public function update($table,$mod_content,$condition){ $this->query("UPDATE $table SET $mod_content WHERE $condition"); } /*取得上一步 INSERT 操作产生的 ID*/ public function insert_id(){ return mysql_insert_id(); } //指向确定的一条数据记录 public function db_data_seek($id){ if($id>0){ $id=$id-1; } if(!@mysql_data_seek($this->result,$id)){ $this->show_error("sql语句有误:", "指定的数据为空"); } return $this->result; } // 根据select查询结果计算结果集条数 public function db_num_rows(){ if($this->result==null){ if($this->show_error){ $this->show_error("sql语句错误","暂时为空,没有任何内容!"); } }else{ return mysql_num_rows($this->result); } } // 根据insert,update,delete执行结果取得影响行数 public function db_affected_rows(){ return mysql_affected_rows(); } //输出显示sql语句 public function show_error($message="",$sql=""){ if(!$sql){ echo "".$message.""; echo " "; }else{ echo ""; echo " "; } //释放结果集 public function free(){ @mysql_free_result($this->result); } //数据库选择 public function select_db($db_database){ return mysql_select_db($db_database); } //查询字段数量 public function num_fields($table_name){ //return mysql_num_fields($this->result); $this->query("select * from $table_name"); echo " "; echo "字段数:".$total = mysql_num_fields($this->result); echo "
";<br> for ($i=0; $i print_r(mysql_fetch_field($this->result,$i) );<br> }<br> echo "
"; echo " "; } //取得 MySQL 服务器信息 public function mysql_server($num=''){ switch ($num){ case 1 : return mysql_get_server_info(); //MySQL 服务器信息 break; case 2 : return mysql_get_host_info(); //取得 MySQL 主机信息 break; case 3 : return mysql_get_client_info(); //取得 MySQL 客户端信息 break; case 4 : return mysql_get_proto_info(); //取得 MySQL 协议信息 break; default: return mysql_get_client_info(); //默认取得mysql版本信息 } } //析构函数,自动关闭数据库,垃圾回收机制 public function __destruct() { if(!empty($this->result)){ $this->free(); } mysql_close($this->conn); }//function __destruct(); /*获得客户端真实的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); } } ?>
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