php连接mysql数据库代码_php连接数据库操作代码

xyzjr

<?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.