php连接mysql数据库代码_php连接数据库操作代码

<?php
mysql_connect("localhost","root","123456") //填写mysql用户名和密码
   or die("Could not connect to MySQL server!");
mysql_select_db("phpcms") //数据库名
   or die("Could not select database!");
mysql_query('set names "gbk"'); //数据库内数据的编码
?>

上面是 php连接mysql数据库代码 ,其实php连接mssql的方法也十分类似.
下一期我们分析下phpcms的数据库链接,他支持mysql,mssql,access三种.
这里三贴出三个类库的完整代码:

db_access.class.php

<?php
defined('IN_PHPCMS') or exit('Access Denied');

class db_access
{
	var $querynum = 0;
	var $conn;
	var $insertid = 0;
	var $cursor = 0;

	function connect($dbhost, $dbuser = '', $dbpw = '', $dbname = '', $pconnect = 0)
	{
		$this->conn = new com('adodb.connection');
		if(!$this->conn) return false;
		//	or exit('Cannot start ADO');
		$this->conn->open("DRIVER={Microsoft Access Driver (*.mdb)};dbq=$dbhost;uid=$dbuser;pwd=$dbpw");
		if($this->conn->state == 0)
		{
			$this->conn->open("Provider=Microsoft.Jet.OLEDB.4.0; Data Source=$dbhost");
			if($this->conn->state == 0)	return false;;
		}
		define('NUM', 1);
		define('ASSOC', 2);
		define('BOTH', 3);
		return $this->conn->state;
	}


	function select_db($dbname)
	{
		return $this->conn->state;
	}

	function query($sql, $type = '', $expires = 3600, $dbname = '')
	{
		$this->querynum++;
		$sql = trim($sql);
		if(preg_match("/^(select.*)limit ([0-9]+)(,([0-9]+))?$/i", $sql, $matchs))
		{
			$sql = $matchs[1];
			$offset = $matchs[2];
			$pagesize = $matchs[4];
			$query = $this->conn->Execute($sql);
			return $this->limit($query, $offset, $pagesize);
		}
		else
		{
			return $this->conn->Execute($sql);
		}
	}

	function get_one($query)
	{
		$this->querynum++;
	    $rs = $this->conn->Execute($query);
		$r = $this->fetch_array($rs);
		$this->free_result($rs);
		return $r;
	}

	function fetch_array($rs, $result_type = 3)
	{
		if(is_array($rs))
		{
			return $this->cursor < count($rs) ? $rs[$this->cursor++] : FALSE;
		}
		else
		{
			if($rs->EOF) return FALSE;
			$array = array();
			for($i = 0; $i < $this->num_fields($rs); $i++)
			{
				$fielddata = $rs->Fields[$i]->Value;
			    if($result_type == NUM || $result_type == BOTH) $array[$i] = $fielddata;
			    if($result_type == ASSOC || $result_type == BOTH) $array[$rs->Fields[$i]->Name] = $fielddata;
			}
			$rs->MoveNext();
			return $array;
		}
	}
	
	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 num_rows($rs)
	{
	    return is_array($rs) ? count($rs) : $rs->recordcount;
	}

	function num_fields($rs)
	{
	    return $rs->Fields->Count;
	}

	function fetch_assoc($rs)
	{
	    return $this->fetch_array($rs, ASSOC);
	}

	function fetch_row($rs)
	{
	    return $this->fetch_array($rs, NUM);
	}

	function free_result($rs)
	{
	    if(is_resource($rs)) $rs->close();
	}

	function error()
	{
	    return $this->conn->Errors[$this->conn->Errors->Count-1]->Number;
	}

	function errormsg()
	{
	    return $this->conn->Errors[$this->conn->Errors->Count-1]->Description;
	}

	function close()
	{
	    $this->conn->close();
	}

	function limit($rs, $offset, $pagesize = 0)
	{
		if($pagesize > 0)
		{
			$rs->Move($offset);
		}
		else
		{
			$pagesize = $offset;
		}
		$info = array();
		for($i = 0; $i < $pagesize; $i++)
		{
			$r = $this->fetch_array($rs);
			if(!$r) break;
			$info[] = $r;
		}
		$this->free_result($rs);
		$this->cursor = 0;
		return $info;
	}
}
?>

db_mssql.class.php :

<?php
defined('IN_PHPCMS') or exit('Access Denied');

class db_mssql
{
	var $querynum = 0;
	var $connid = 0;
	var $insertid = 0;
	var $cursor = 0;

	function connect($dbhost = 'localhost', $dbuser, $dbpw, $dbname, $pconnect = 0)
	{
		$func = $pconnect == 1 ? 'mssql_pconnect' : 'mssql_connect';
		if(!$this->connid = @$func($dbhost, $dbuser, $dbpw))
		{
        	$this->halt('Can not connect to MsSQL server');
		}
		if($dbname) 
		{
			if(!@mssql_select_db($dbname , $this->connid))
			{
				$this->halt('Cannot use database '.$dbname);
			}
		}
		return $this->connid;
	}

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

	function query($sql, $type = '', $expires = 3600, $dbname = '')
	{
		$this->querynum++;
		$sql = trim($sql);
		if(preg_match("/^(select.*)limit ([0-9]+)(,([0-9]+))?$/i", $sql, $matchs))
		{
			$sql = $matchs[1];
			$offset = $matchs[2];
			$pagesize = $matchs[4];
			$query = mssql_query($sql, $this->connid) or $this->halt('MsSQL Query Error', $sql);
			return $this->limit($query, $offset, $pagesize);
		}
		elseif(preg_match("/^insert into/i", $sql))
		{
			$sql = "$sql; SELECT @@identity as insertid";
			$query = mssql_query($sql, $this->connid) or $this->halt('MsSQL Query Error', $sql);
			$insid = $this->fetch_row($query);
			$this->insertid = $insid[0];
			return $query;
		}
		else
		{
			$query = mssql_query($sql, $this->connid) or $this->halt('MsSQL Query Error', $sql);
			return $query;
		}
	}

	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 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 fetch_array($query, $type = MSSQL_ASSOC)
	{
		if(is_resource($query)) return mssql_fetch_array($query, $type);
		if($this->cursor < count($query))
		{ 
			return $query[$this->cursor++]; 
		}
		return FALSE; 
	}

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

	function num_rows($query) 
	{
		return is_array($query) ? count($query) : mssql_num_rows($query);
	}
	
	function num_fields($query) 
	{
		return mssql_num_fields($query);
	}

	function result($query, $row)
	{
		return @mssql_result($query, $row);
	}

	function free_result($query)
	{
		if(is_resource($query)) mssql_free_result($query);
	}

	function insert_id()
	{
		return $this->insertid;
	}
	
	function fetch_row($query)
	{
		return mssql_fetch_row($query);
	}

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

	function error()
	{
		return TRUE;
	}

	function errno()
	{
		return TRUE;
	}

	function halt($message = '', $sql = '')
	{
		exit("MsSQL Query:$sql <br> MsSQL Error:".$this->error()." <br> MsSQL Errno:".$this->errno()." <br> Message:$message");
	}

	function limit($query, $offset, $pagesize = 0)
	{
		if($pagesize > 0)
		{
			mssql_data_seek($query, $offset);
		}
		else
		{
			$pagesize = $offset;
		}
		$info = array();
		for($i = 0; $i < $pagesize; $i++)
		{
			$r = $this->fetch_array($query);
			if(!$r) break;
			$info[] = $r;
		}
		$this->free_result($query);
		$this->cursor = 0;
		return $info;
	}
}
?>

db_mysql.class.php :

<?php
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 &nbsp; select', 'load_file &nbsp; (', 'into &nbsp; 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.php'))
			{
				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 && !@mysql_select_db($dbname , $this->connid))
		{
			$this->halt('Cannot use database '.$dbname);
			return false;
		}
		$this->dbname = $dbname;
		return $this->connid;
	}

	function select_db($dbname)
	{
		if(!@mysql_select_db($dbname , $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)
	{
		$this->check_fields($tablename, $array);
		return $this->query("INSERT INTO `$tablename`(`".implode('`,`', array_keys($array))."`) VALUES('".implode("','", $array)."')");
	}

	function update($tablename, $array, $where = '')
	{
		$this->check_fields($tablename, $array);
		if($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 check_fields($tablename, $array)
	{
		$fields = $this->get_fields($tablename);
		foreach($array AS $k=>$v)
		{
			if(!in_array($k,$fields))
			{
				$this->halt('MySQL Query Error', "Unknown column '$k' in field list");
				return false;
			}
		}
	}

	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 = '')
	{
		$this->errormsg = "<b>MySQL Query : </b>$sql <br /><b> MySQL Error : </b>".$this->error()." <br /> <b>MySQL Errno : </b>".$this->errno()." <br /><b> Message : </b> $message";
		if($this->debug)
		{
			$msg = (defined('IN_ADMIN') || DEBUG) ? $this->errormsg : "Bad Request. $LANG[illegal_request_return]";
			echo '<div style="font-size:12px;text-align:left; border:1px solid #9cc9e0; padding:1px 4px;color:#000000;font-family:Arial, Helvetica,sans-serif;"><span>'.$msg.'</span></div>';
			exit;
		}
	}
}
?>

三个类库都在这里,下一期再详细分析.

评论

4 楼 guozhiwei 2010-04-22  

mysql_query('set names "gbk"'); //数据库内数据的编码

这里的set names 的编码可以和数据库的编码不一致

只要set names这里的编码和页面文件的编码一直就不会出现乱码了

3 楼 七月十五 2010-04-06  

早就PHP5.3了，还在var

2 楼 七月十五 2010-04-06  

早就PDO了，还在造轮子

1 楼 化蝶自在飞 2010-04-06  

暴喜欢javaeye的代码风格,和EditPlus神似啊.顶.