PHP将图片存入mysql实现代码

下面只告诉你如何实现图片如何保存到数据库教程，不推荐此种方法。
*/

mysql_connect('localhost','root','root');
mysql_select_db('ac');
$picdir ="/a/ag.gif";
$image = addslashes(file_get_contents($picdir));
$sql ="insert into tbl_name (field) values ('" . $image . "')";
mysql_query($sql);

/*
--
-- 表的结构 `test`
--

create table if not exists `test` (
  `id` int(8) not null auto_increment,
  `title` char(150) default null,
  `content` longblob,
  `addnewcolumn` varchar(20) not null,
  primary key  (`id`)
) engine=myisam default charset=utf8 auto_increment=1 ;

这里提供的数据库连接类程序，后面还提供了一个sql安全检测函数与sql语句完整性检测函数。*/

class db_mysql {
 var $connid;
 var $querynum = 0;
 var $expires;
 var $cursor = 0;
 var $cache_id = '';
 var $cache_file = '';
 var $cache_expires = '';
 var $halt = 0;
 var $result = array();

 function connect($dbhost, $dbuser, $dbpw, $dbname, $pconnect = 0) {
  global $cfg;
  $this->expires = $cfg['db_expires'];
  $func = $pconnect == 1 ? 'mysql_pconnect' : 'mysql_connect';
  if(!$this->connid = $func($dbhost, $dbuser, $dbpw)) {
   $this->halt('can not connect to mysql server');
  }
  if($this->version() > '4.1' && $cfg['db_charset']) {
   mysql_query("set names '".$cfg['db_charset']."'" , $this->connid);
  }
  if($this->version() > '5.0') {
   mysql_query("set sql_mode=''" , $this->connid);
  }
  if($dbname) {
   if(!mysql_select_db($dbname , $this->connid)) {
    $this->halt('cannot use database '.$dbname);
   }
  }
  return $this->connid;
 }

 function select_db($dbname) {
  return mysql_select_db($dbname , $this->connid);
 }

 function query($sql , $type = '', $expires = 0, $save_id = false) {
        $sql=checksql($sql);
  if($type == 'cache' && stristr($sql, 'select')) {
   $this->cursor = 0;
   $this->cache_id = md5($sql);
   $this->result = array();
   $this->cache_expires = $expires ? $expires + mt_rand(-9, 9) : $this->expires;
   return $this->_query($sql);
  }
  if(!$save_id) $this->cache_id = 0;
  $func = $type == 'unbuffered' ? 'mysql_unbuffered_query' : 'mysql_query';
  if(!($query = $func($sql , $this->connid)) && $this->halt) {
   $this->halt('mysql query error', $sql);
  }
  $this->querynum++;
  return $query;
 }

 function get_one($sql, $type = '', $expires = 0) {
  $query = $this->query($sql, $type, $expires);
  $r = $this->fetch_array($query);
  $this->free_result($query);
  return $r ;
 }
 
 function counter($table, $condition = '', $type = '', $expires = 0) {
  global $cfg;
  $table = strpos($table, $cfg['tb_pre']) === false ? $cfg['tb_pre'].$table : $table;
  $sql = "select count(*) as num from {$table}";
  if($condition) $sql .= " where $condition";
  $r = $this->get_one($sql, $type, $expires);
  return $r ? $r['num'] : 0;
 }

 function fetch_array($query, $result_type = mysql_assoc) {
  return $this->cache_id ? $this->_fetch_array($query) : @mysql_fetch_array($query, $result_type);
 }

 function affected_rows() {
  return mysql_affected_rows($this->connid);
 }

 function num_rows($query) {
  return mysql_num_rows($query);
 }

 function num_fields($query) {
  return mysql_num_fields($query);
 }
 function escape_string($str){
  return mysql_escape_string($str);
 }
 function result($query, $row) {
  return @mysql_result($query, $row);
 }

 function free_result($query) {
  return @mysql_free_result($query);
 }

 function insert_id() {
  return mysql_insert_id($this->connid);
 }

 function fetch_row($query) {
  return mysql_fetch_row($query);
 }

 function version() {
  return mysql_get_server_info($this->connid);
 }

 function close() {
  return mysql_close($this->connid);
 }

 function error() {
  return @mysql_error($this->connid);
 }

 function errno() {
  return intval(@mysql_errno($this->connid)) ;
 }

 function halt($message = '', $sql = '') {
  global $cfg;
  if($message) {
   if($cfg['errlog']) {
    $log = "query:$sql|errno:".$this->errno()."|error:".$this->error()."|errmsg:$message";
    log_write($log, 'sql');
   }
  }
        showmsg("mysqlerror:$message",'-1');
        exit();
 }

 function _query($sql) {
  global $fr_time;
  $this->cache_file = cache_root.'/sql/'.substr($this->cache_id, 0, 2).'/'.$this->cache_id.'.php教程';
  if(!is_file($this->cache_file) || ($fr_time - @filemtime($this->cache_file) > $this->cache_expires)) {
   $tmp = array();
   $result = $this->query($sql, '', '', true);
   while($r = mysql_fetch_array($result, mysql_assoc)) {
    $tmp[] = $r;
   }
   $this->result = $tmp;
   $this->free_result($result);
   file_put($this->cache_file, "<?php /*".( $fr_time+$this->cache_expires)."*/ return ".var_export($this->result, true).";n?>");
  } else {
      $this->result = include $this->cache_file;
  }
  return $this->result;
 }

 function _fetch_array($query = array()) {
  if($query) $this->result = $query;
  if(isset($this->result[$this->cursor])) {
   return $this->result[$this->cursor++];
  } else {
   $this->cursor = $this->cache_id = 0;
   return array();
  }
 }
}

function checksql($dbstr,$querytype='select'){
 $clean = '';
 $old_pos = 0;
 $pos = -1;
 //普通语句，直接过滤特殊语法
 if($querytype=='select'){
  $nastr = "/[^0-9a-z@._-]{1,}(union|sleep|benchmark|load_file|outfile)[^0-9a-z@.-]{1,}/i";
  if(preg_match($nastr,$dbstr)){
            log_write($dbstr,'sql');
            showmsg('safeerror:10001', '网页特效:;');
            exit();
  }
 }
 //完整的sql检查
 while (true){
  $pos = strpos($dbstr, ''', $pos + 1);
  if ($pos === false){
   break;
  }
  $clean .= substr($dbstr, $old_pos, $pos - $old_pos);
  while (true){
   $pos1 = strpos($dbstr, ''', $pos + 1);
   $pos2 = strpos($dbstr, '', $pos + 1);
   if ($pos1 === false){
    break;
   }
   elseif ($pos2 == false || $pos2 > $pos1){
    $pos = $pos1;
    break;
   }
   $pos = $pos2 + 1;
  }
  $clean .= '$s$';
  $old_pos = $pos + 1;
 }
 $clean .= substr($dbstr, $old_pos);
 $clean = trim(strtolower(preg_replace(array('~s+~s' ), array(' '), $clean)));
 if (strpos($clean, 'union') !== false && preg_match('~(^|[^a-z])union($|[^[a-z])~s', $clean) != 0){
  $fail = true;
 }
 elseif (strpos($clean, '/*') > 2 || strpos($clean, '--') !== false || strpos($clean, '#') !== false){
  $fail = true;
 }
 elseif (strpos($clean, 'sleep') !== false && preg_match('~(^|[^a-z])sleep($|[^[a-z])~s', $clean) != 0){
  $fail = true;
 }
 elseif (strpos($clean, 'benchmark') !== false && preg_match('~(^|[^a-z])benchmark($|[^[a-z])~s', $clean) != 0){
  $fail = true;
 }
 elseif (strpos($clean, 'load_file') !== false && preg_match('~(^|[^a-z])load_file($|[^[a-z])~s', $clean) != 0){
  $fail = true;
 }
 elseif (strpos($clean, 'into outfile') !== false && preg_match('~(^|[^a-z])intos+outfile($|[^[a-z])~s', $clean) != 0){
  $fail = true;
 }
 elseif (preg_match('~([^)]*?select~s', $clean) != 0){
  $fail = true;
 }
 if (!empty($fail)){
        log_write($dbstr,'sql');
        showmsg('safeerror:10002', 'javascript:;');exit;
 }
 else
 {
  return $dbstr;
 }
}

<html>
<head>
<title></title>
</head>
<body>
<?php
$mysql_server_name='localhost';
$mysql_username='root';
$mysql_password='000000';
$mysql_database='lib';
$conn=mysql_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database);
$sql="select name,age from mytb";
print($conn);
$rs=mysql_db_query("lib","select * from mytb",$conn);
print("
<br>");
while($row = mysql_fetch_object($rs)){
print ($row->name.":".$row->age."<br>");
}
mysql_close($conn);
?>

　　

显示如下：

resource id #1

dd:54
ddd:8
??:15
???:25
??:32

　　mysql编码：utf8,gbk都试过了。mysql font 和命令行显示都正确。

　　问题补充：

　　乱码:

???:15
???:25
??:32

　　这几行,数据库教程里的值是汉字.显示出来的是问号.

　　解决办法：

　在$rs=mysql_db_query("lib","select * from mytb",$conn);

　　前面加上

mysql_query("set names gb2312");或者mysql_query("set names gbk");

下面看一下关于解决乱码的方法

.gb2312,gbk,utf8等支持多字节编码的字符集都可以储存汉字，gb2312中的汉字数量远少于gbk，而gb2312,gbk等都可在utf8下编码。

　　二.用命令show variables like 'character_set_%';查看当前字符集设定：

mysql> show variables like 'character_set_%';
+--------------------------+--------+
| variable_name　　　　　　| value　|
+--------------------------+--------+
| character_set_client　　 | gb2312 |
| character_set_connection | gb2312 |
| character_set_database　 | gb2312 |
| character_set_filesystem | binary |
| character_set_results　　| gb2312 |
| character_set_server　　 | latin1 |
| character_set_system　　 | utf8　 |
+--------------------------+--------+
7 rows in set (0.02 sec)

　　

(这里设置的字符是gb2312)

　　显示中文乱码主要有两个设置:character_set_connection 和character_set_results ,

　　如果你的这两个设置不支持中文编码,就会出现乱码,只要:set character_set_results =gbk;就设置中文编码了。

　　三.set names charset_name;可以一次性设置客户端的所有字符集。

db.execsql(sql); 或者db.insert()、db.delete()、db.update()，并且包括数据表的创建和删除等等也可以通过execsql实现
//创建表

//添加数据

//修改

}

如果要显示mysql一个指定数据库的表名的话方法很简单，mysql提供了一个show tables命令，它返回的是一个数据，下面来看我做的详细实例，经过测试完全可用
*/

//本站原创教程转载注明来源于http://www.111cn.net保留连接地址，否则必究! 
 ?>