jsp 数据库连接查询类代码
连接查询类代码
define('DB_HOST', 'localhost'); //数据库服务器主机地址
define('DB_USER', 'zkh131'); //数据库帐号
define('DB_PW', 'n3a9q2e3'); //数据库密码
define('DB_NAME', 'zkh131_db'); //数据库名
define('DB_PRE', 'hl_'); //数据库表前缀，同一数据库安装多套Phpcms时，请修改表前缀
define('DB_CHARSET', 'gbk'); //数据库字符集
define('DB_PCONNECT', 0); //0 或1，是否使用持久连接
define('DB_DATABASE', ''); //数据库类型
$db = new db_mysql;
$db->connect(DB_HOST, DB_USER, DB_PW, DB_NAME, DB_PCONNECT, DB_CHARSET);
class db_mysql
{
var $connid;
var $dbname;
var $querynum = 0;
var $debug = 1;
var $search = array('/union(s*(/*.**/)?s*)+select/i', '/load_file(s*(/*.**/)?s*)+(/i', '/into(s*(/*.**/)?s*)+outfile/i');
var $replace = array('union select', 'load_file (', 'into outfile');
function connect($dbhost, $dbuser, $dbpw, $dbname = '', $pconnect = 0, $charset = '')
{
$func = $pconnect == 1 ? 'mysql_pconnect' : 'mysql_connect';
if(!$this->connid = @$func($dbhost, $dbuser, $dbpw))
{
if(DB_NAME == '' && file_exists(PHPCMS_ROOT.'install.'))
{
header('location:./install.php');
exit;
}
$this->halt('Can not connect to MySQL server');
return false;
}
if($this->version() > '4.1')
{
$serverset = $charset ? "character_set_connection='$charset',character_set_results='$charset',character_set_client=binary" : '';
$serverset .= $this->version() > '5.0.1' ? ((empty($serverset) ? '' : ',')." sql_mode='' ") : '';
$serverset && mysql_query("SET $serverset", $this->connid);
}
if($dbname && , $this->connid))
{
$this->halt('Cannot use database '.$dbname);
return false;
}
$this->dbname = $dbname;
return $this->connid;
}
function select_db($dbname)
{
if( , $this->connid)) return false;
$this->dbname = $dbname;
return true;
}
function query($sql , $type = '')
{
$func = $type == 'UNBUFFERED' ? 'mysql_unbuffered_query' : 'mysql_query';
if(!($query = @$func($sql , $this->connid)) && $type != 'SILENT')
{
$this->halt('MySQL Query Error', $sql);
return false;
}
$this->querynum++;
return $query;
}
function select($sql, $keyfield = '')
{
$array = array();
$result = $this->query($sql);
while($r = $this->fetch_array($result))
{
if($keyfield)
{
$key = $r[$keyfield];
$array[$key] = $r;
}
else
{
$array[] = $r;
}
}
$this->free_result($result);
return $array;
}
function insert($tablename, $array)
{
return $this->query("INSERT INTO `$tablename`(`".implode('`,`', array_keys($array))."`) VALUES('".implode("','", $array)."')");
}
function update($tablename, $array, $where = '')
{
if($where)
{
$sql = '';
foreach($array as $k=>$v)
{
$sql .= ", `$k`='$v'";
}
$sql = substr($sql, 1);
$sql = "UPDATE `$tablename` SET $sql WHERE $where";
}
else
{
$sql = "REPLACE INTO `$tablename`(`".implode('`,`', array_keys($array))."`) VALUES('".implode("','", $array)."')";
}
return $this->query($sql);
}
function get_primary($table)
{
$result = $this->query("SHOW COLUMNS FROM $table");
while($r = $this->fetch_array($result))
{
if($r['Key'] == 'PRI') break;
}
$this->free_result($result);
return $r['Field'];
}
function get_fields($table)
{
$fields = array();
$result = $this->query("SHOW COLUMNS FROM $table");
while($r = $this->fetch_array($result))
{
$fields[] = $r['Field'];
}
$this->free_result($result);
return $fields;
}
function get_one($sql, $type = '', $expires = 3600, $dbname = '')
{
$query = $this->query($sql, $type, $expires, $dbname);
$rs = $this->fetch_array($query);
$this->free_result($query);
return $rs ;
}
function fetch_array($query, $result_type = MYSQL_ASSOC)
{
return mysql_fetch_array($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 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 escape($string)
{
if(!is_array($string)) return str_replace(array('n', 'r'), array(chr(10), chr(13)), mysql_real_escape_string(preg_replace($this->search, $this->replace, $string), $this->connid));
foreach($string as $key=>$val) $string[$key] = $this->escape($val);
return $string;
}
function table_status($table)
{
return $this->get_one("SHOW TABLE STATUS LIKE '$table'");
}
function tables()
{
$tables = array();
$result = $this->query("SHOW TABLES");
while($r = $this->fetch_array($result))
{
$tables[] = $r['Tables_in_'.$this->dbname];
}
$this->free_result($result);
return $tables;
}
function table_exists($table)
{
$tables = $this->tables($table);
return in_array($table, $tables);
}
function field_exists($table, $field)
{
$fields = $this->get_fields($table);
return in_array($field, $fields);
}
function version()
{
return mysql_get_server_info($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 = '')
{
$this->errormsg = "MySQL Query : $sql
MySQL Error : ".$this->error()."
MySQL Errno : ".$this->errno()."
Message : $message";
if($this->debug)
{
$msg = (defined('IN_ADMIN') || DEBUG) ? $this->errormsg : "Bad Request. $LANG[illegal_request_return]";
echo '
exit;
}
}
}
