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mysqli.class.php
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<?php
/**
* 数据库MySQLI返回类
*
* @author 呼吸二氧化碳 <jonwang@myqee.com>
* @category Driver
* @package Database
* @subpackage MySQLI
* @copyright Copyright (c) 2008-2013 myqee.com
* @license http://www.myqee.com/license.html
*/
class Driver_Database_Driver_MySQLI extends Database_Driver
{
/**
* MySQL使用反引号标识符
*
* @var string
*/
protected $_identifier = '`';
/**
* 记录当前连接所对应的数据库
* @var array
*/
protected static $_current_databases = array();
/**
* 记录当前数据库所对应的页面编码
* @var array
*/
protected static $_current_charset = array();
/**
* 链接寄存器
* @var array
*/
protected static $_connection_instance = array();
/**
* 记录connection id所对应的hostname
* @var array
*/
protected static $_current_connection_id_to_hostname = array();
/**
* 连接数据库
*
* $use_connection_type 默认不传为自动判断，可传true/false,若传字符串(只支持a-z0-9的字符串)，则可以切换到另外一个连接，比如传other,则可以连接到$this->_connection_other_id所对应的ID的连接
*
* @param boolean $use_connection_type 是否使用主数据库
*/
public function connect($use_connection_type = null)
{
if (null!==$use_connection_type)
{
$this->_set_connection_type($use_connection_type);
}
$connection_id = $this->connection_id();
# 最后检查连接时间
static $last_check_connect_time = 0;
if (!$connection_id || !isset(Database_Driver_MySQLI::$_connection_instance[$connection_id]))
{
$this->_connect();
}
# 如果有当前连接，检查连接
if ($last_check_connect_time>0 && time()-$last_check_connect_time>=5)
{
# 5秒后检查一次连接状态
$this->_check_connect();
}
# 设置编码
$this->set_charset($this->config['charset']);
# 切换表
$this->_select_db($this->config['connection']['database']);
$last_check_connect_time = time();
}
/**
* 获取当前连接
*
* @return mysqli
*/
public function connection()
{
# 尝试连接数据库
$this->connect();
# 获取连接ID
$connection_id = $this->connection_id();
if ($connection_id && isset(Database_Driver_MySQLI::$_connection_instance[$connection_id]))
{
return Database_Driver_MySQLI::$_connection_instance[$connection_id];
}
else
{
throw new Exception('数据库连接异常');
}
}
protected function _connect()
{
$database = $hostname = $port = $socket = $username = $password = $persistent = null;
extract($this->config['connection']);
if (!$port>0)
{
$port = 3306;
}
# 检查下是否已经有连接连上去了
if (Database_Driver_MySQLI::$_connection_instance)
{
if (is_array($hostname))
{
$hostconfig = $hostname[$this->_connection_type];
if (!$hostconfig)
{
throw new Exception('指定的数据库连接主从配置中('.$this->_connection_type.')不存在，请检查配置');
}
if (!is_array($hostconfig))
{
$hostconfig = array($hostconfig);
}
}
else
{
$hostconfig = array
(
$hostname
);
}
# 先检查是否已经有相同的连接连上了数据库
foreach ($hostconfig as $host)
{
$_connection_id = $this->_get_connection_hash($host, $port, $username);
if (isset(Database_Driver_MySQLI::$_connection_instance[$_connection_id]))
{
$this->_connection_ids[$this->_connection_type] = $_connection_id;
return;
}
}
}
# 错误服务器
static $error_host = array();
$last_error = null;
while (true)
{
$hostname = $this->_get_rand_host($error_host);
if (false===$hostname)
{
Core::debug()->error($error_host, 'error_host');
if ($last_error && $last_error instanceof Exception)throw $last_error;
throw new Exception('connect mysqli server error.');
}
$_connection_id = $this->_get_connection_hash($hostname, $port, $username);
Database_Driver_MySQLI::$_current_connection_id_to_hostname[$_connection_id] = $hostname.':'.$port;
try
{
$time = microtime(true);
$error_code = 0;
$error_msg = '';
try
{
if (empty($persistent))
{
$tmplink = mysqli_init();
mysqli_options($tmplink, MYSQLI_OPT_CONNECT_TIMEOUT, 3);
mysqli_real_connect($tmplink, $hostname, $username, $password, $database, $port, null, MYSQLI_CLIENT_COMPRESS);
}
else
{
$tmplink = new mysqli($hostname, $username, $password, $database, $port);
}
}
catch (Exception $e)
{
$error_msg = $e->getMessage();
$error_code = $e->getCode();
$tmplink = false;
}
if (false===$tmplink)
{
if (IS_DEBUG)throw $e;
if (!($error_msg && 2===$error_code && preg_match('#(Unknown database|Access denied for user)#i', $error_msg)))
{
$error_msg = 'connect mysqli server error.';
}
throw new Exception($error_msg, $error_code);
}
if (IS_DEBUG)Core::debug()->info('mysqli://'.$username.'@'.$hostname.':'.$port.'/'.$database.'/ connection time:' . (microtime(true) - $time));
# 连接ID
$this->_connection_ids[$this->_connection_type] = $_connection_id;
Database_Driver_MySQLI::$_connection_instance[$_connection_id] = $tmplink;
Database_Driver_MySQLI::$_current_databases[$_connection_id] = $database;
unset($tmplink);
break;
}
catch (Exception $e)
{
if (IS_DEBUG)
{
Core::debug()->error($username.'@'.$hostname.':'.$port.'.Msg:'.strip_tags($e->getMessage(), '') .'.Code:'. $e->getCode(), 'connect mysqli server error');
$last_error = new Exception($e->getMessage(), $e->getCode());
}
else
{
$last_error = new Exception('connect mysqli server error', $e->getCode());
}
if (2===$e->getCode() && preg_match('#(Unknown database|Access denied for user)#i', $e->getMessage(), $m))
{
// 指定的库不存在，直接返回
throw new Exception(strtolower($m[1])=='unknown database'?__('The mysql database does not exist'):__('The mysql database account or password error'));
}
else
{
if (!in_array($hostname, $error_host))
{
$error_host[] = $hostname;
}
}
}
}
}
/**
* 检查连接是否可用
*
* 防止因长时间不链接而导致连接丢失的问题 MySQL server has gone away
*
* @throws Exception
*/
protected function _check_connect()
{
# 5秒检测1次
static $error_num = 0;
try
{
$connection_id = $this->connection_id();
$connection = Database_Driver_MySQLI::$_connection_instance[$connection_id];
if ($connection)
{
$ping_status = mysqli_ping($connection);
}
else
{
$ping_status = false;
}
}
catch (Exception $e)
{
$error_num++;
$ping_status = false;
}
if (!$ping_status)
{
if ($error_num<5)
{
$this->close_connect();
# 等待3毫秒
usleep(3000);
# 再次尝试连接
$this->connect();
$error_num = 0;
}
else
{
throw new Exception('connect mysqli server error');
}
}
}
/**
* 关闭链接
*/
public function close_connect()
{
if ($this->_connection_ids)foreach ($this->_connection_ids as $key=>$connection_id)
{
if ($connection_id && Database_Driver_MySQLI::$_connection_instance[$connection_id])
{
Core::debug()->info('close '.$key.' mysqli '.Database_Driver_MySQLI::$_current_connection_id_to_hostname[$connection_id].' connection.');
@mysqli_close(Database_Driver_MySQLI::$_connection_instance[$connection_id]);
unset(Database_Driver_MySQLI::$_connection_instance[$connection_id]);
unset(Database_Driver_MySQLI::$_current_databases[$connection_id]);
unset(Database_Driver_MySQLI::$_current_charset[$connection_id]);
unset(Database_Driver_MySQLI::$_current_connection_id_to_hostname[$connection_id]);
}
else
{
Core::debug()->info($key.' mysqli '.Database_Driver_MySQLI::$_current_connection_id_to_hostname[$connection_id].' connection has closed.');
}
$this->_connection_ids[$key] = null;
}
}
/**
* 切换表
*
* @param string Database
* @return void
*/
protected function _select_db($database)
{
if (!$database)return;
$connection_id = $this->connection_id();
if (!$connection_id || !isset(Database_Driver_MySQLI::$_current_databases[$connection_id]) || $database!=Database_Driver_MySQLI::$_current_databases[$connection_id])
{
$connection = Database_Driver_MySQLI::$_connection_instance[$connection_id];
if (!$connection)
{
$this->connect();
$this->_select_db($database);
return;
}
if (!mysqli_select_db($connection,$database))
{
throw new Exception('选择数据表错误:' . mysqli_error($connection), mysqli_errno($connection));
}
if (IS_DEBUG)
{
$host = $this->_get_hostname_by_connection_hash($this->connection_id());
$benchmark = Core::debug()->info(($host['username']?$host['username'].'@':'') . $host['hostname'] . ($host['port'] && $host['port']!='3306'?':'.$host['port']:'').'select to db:'.$database);
}
# 记录当前已选中的数据库
Database_Driver_MySQLI::$_current_databases[$connection_id] = $database;
}
}
/**
* 构建SQL语句
*/
public function compile($builder, $type = 'select')
{
if ($type == 'select')
{
return $this->_compile_select($builder);
}
else if ($type == 'insert')
{
return $this->_compile_insert($builder);
}
elseif ($type == 'replace')
{
return $this->_compile_insert($builder, 'REPLACE');
}
elseif ($type == 'update')
{
return $this->_compile_update($builder);
}
elseif ($type == 'delete')
{
return $this->_compile_delete($builder);
}
else
{
return $this->_compile_select($builder);
}
}
/**
* 设置编码
*
* @param string $charset
* @throws Exception
* @return void|boolean
*/
public function set_charset($charset)
{
if (!$charset)return;
$connection_id = $this->connection_id();
$connection = Database_Driver_MySQLI::$_connection_instance[$connection_id];
if (!$connection_id || !$connection)
{
$this->connect();
$this->set_charset($charset);
return;
}
static $_set_names = null;
if (null === $_set_names)
{
// Determine if we can use mysql_set_charset(), which is only
// available on PHP 5.2.3+ when compiled against MySQL 5.0+
$_set_names = ! function_exists('mysqli_set_charset');
}
if (isset(Database_Driver_MySQLI::$_current_charset[$connection_id]) && $charset == Database_Driver_MySQLI::$_current_charset[$connection_id])
{
return true;
}
if (true===$_set_names)
{
// PHP is compiled against MySQL 4.x
$status = (bool)mysqli_query($connection,'SET NAMES ' . $this->quote($charset));
}
else
{
// PHP is compiled against MySQL 5.x
$status = mysqli_set_charset($connection, $charset);
}
if ($status === false)
{
throw new Exception('Error:' . mysqli_error($connection), mysqli_errno($connection));
}
# 记录当前设置的编码
Database_Driver_MySQLI::$_current_charset[$connection_id] = $charset;
}
public function escape($value)
{
$connection = $this->connection();
$this->_change_charset($value);
if (($value = mysqli_real_escape_string($connection, $value)) === false)
{
throw new Exception('Error:' . mysqli_errno($connection), mysqli_error($connection));
}
return "'$value'";
}
/**
* 查询
*
* $use_connection_type 默认不传为自动判断，可传true/false,若传字符串(只支持a-z0-9的字符串)，则可以切换到另外一个连接，比如传other,则可以连接到$this->_connection_other_id所对应的ID的连接
*
* @param string $sql 查询语句
* @param string $as_object 是否返回对象
* @param boolean $use_connection_type 是否使用主数据库，不设置则自动判断
* @return Database_Driver_MySQLI_Result
*/
public function query($sql, $as_object=null, $use_connection_type=null)
{
$sql = trim($sql);
if (preg_match('#^([a-z]+)(:? |\n|\r)#i', $sql, $m))
{
$type = strtoupper($m[1]);
}
$typeArr = array
(
'SELECT',
'SHOW', //显示表
'EXPLAIN', //分析
'DESCRIBE', //显示结结构
'INSERT',
'REPLACE',
'UPDATE',
'DELETE',
);
if (!in_array($type, $typeArr))
{
$type = 'MASTER';
}
$slaverType = array('SELECT', 'SHOW', 'EXPLAIN');
if ($type!='MASTER' && in_array($type, $slaverType))
{
if (true===$use_connection_type)
{
$use_connection_type = 'master';
}
else if (is_string($use_connection_type))
{
if (!preg_match('#^[a-z0-9_]+$#i', $use_connection_type))$use_connection_type = 'master';
}
else
{
$use_connection_type = 'slaver';
}
}
else
{
$use_connection_type = 'master';
}
# 设置连接类型
$this->_set_connection_type($use_connection_type);
# 连接数据库
$connection = $this->connection();
# 记录调试
if(IS_DEBUG)
{
Core::debug()->info($sql, 'MySQL');
static $is_sql_debug = null;
if (null === $is_sql_debug) $is_sql_debug = (bool)Core::debug()->profiler('sql')->is_open();
if ($is_sql_debug)
{
$host = $this->_get_hostname_by_connection_hash($this->connection_id());
$benchmark = Core::debug()->profiler('sql')->start('Database', 'mysqli://' . ($host['username']?$host['username'].'@':'') . $host['hostname'] . ($host['port'] && $host['port'] != '3306' ? ':' . $host['port'] : ''));
}
}
static $is_no_cache = null;
if (null === $is_no_cache) $is_no_cache = (bool)Core::debug()->profiler('nocached')->is_open();
//显示无缓存数据
if ($is_no_cache && strtoupper(substr($sql, 0, 6)) == 'SELECT')
{
$sql = 'SELECT SQL_NO_CACHE' . substr($sql, 6);
}
// Execute the query
if (($result = mysqli_query($connection, $sql)) === false)
{
if (isset($benchmark))
{
// This benchmark is worthless
$benchmark->delete();
}
if (IS_DEBUG)
{
$err = 'Error:' . mysqli_error($connection) . '. SQL:' . $sql;
}
else
{
$err = mysqli_error($connection);
}
throw new Exception($err, mysqli_errno($connection));
}
if (isset($benchmark))
{
# 在线查看SQL情况
if ($is_sql_debug)
{
$data = array();
$data[0]['db'] = $host['hostname'] . '/' . $this->config['connection']['database'] . '/';
$data[0]['select_type'] = '';
$data[0]['table'] = '';
$data[0]['key'] = '';
$data[0]['key_len'] = '';
$data[0]['Extra'] = '';
$data[0]['query'] = '';
$data[0]['type'] = '';
$data[0]['id'] = '';
$data[0]['row'] = count($result);
$data[0]['ref'] = '';
$data[0]['all rows'] = '';
$data[0]['possible_keys'] = '';
if (strtoupper(substr($sql,0,6))=='SELECT')
{
$re = $connection->query('EXPLAIN ' . $sql);
$i = 0;
while (true == ($row = $re->fetch_array(MYSQLI_NUM)))
{
$data[$i]['select_type'] = (string)$row[1];
$data[$i]['table'] = (string)$row[2];
$data[$i]['key'] = (string)$row[5];
$data[$i]['key_len'] = (string)$row[6];
$data[$i]['Extra'] = (string)$row[9];
if ($i==0) $data[$i]['query'] = '';
$data[$i]['type'] = (string)$row[3];
$data[$i]['id'] = (string)$row[0];
$data[$i]['ref'] = (string)$row[7];
$data[$i]['all rows'] = (string)$row[8];
$data[$i]['possible_keys'] = (string)$row[4];
$i++;
}
}
$data[0]['query'] = $sql;
}
else
{
$data = null;
}
Core::debug()->profiler('sql')->stop($data);
}
// Set the last query
$this->last_query = $sql;
if ($type === 'INSERT' || $type === 'REPLACE')
{
// Return a list of insert id and rows created
return array
(
mysqli_insert_id($connection),
mysqli_affected_rows($connection)
);
}
elseif ($type === 'UPDATE' || $type === 'DELETE')
{
// Return the number of rows affected
return mysqli_affected_rows($connection);
}
else
{
// Return an iterator of results
return new Database_Driver_MySQLI_Result($result, $sql, $as_object, $this->config);
}
}
public function quote($value)
{
if ($value === null)
{
return 'NULL';
}
elseif ($value === true)
{
return "'1'";
}
elseif ($value === false)
{
return "'0'";
}
elseif (is_object($value))
{
if ($value instanceof Database)
{
// Create a sub-query
return '(' . $value->compile() . ')';
}
elseif ($value instanceof Database_Expression)
{
// Use a raw expression
return $value->value();
}
else
{
// Convert the object to a string
return $this->quote((string)$value);
}
}
elseif (is_array($value))
{
return '(' . implode(', ', array_map(array($this, __FUNCTION__), $value)) . ')';
}
elseif (is_int($value))
{
return "'".(int)$value."'";
}
elseif (is_float($value))
{
// Convert to non-locale aware float to prevent possible commas
return sprintf('%F', $value);
}
return $this->escape($value);
}
/**
* Quote a database table name and adds the table prefix if needed.
*
* $table = $db->quote_table($table);
*
* @param mixed table name or array(table, alias)
* @return string
* @uses Database::_quote_identifier
* @uses Database::table_prefix
*/
public function quote_table($value, $auto_as_table=false)
{
// Assign the table by reference from the value
if (is_array($value))
{
$table = & $value[0];
}
else
{
$table = & $value;
}
if ($this->config['table_prefix'] && is_string($table) && strpos($table, '.') === false)
{
if (stripos($table, ' AS ')!==false)
{
$table = $this->config['table_prefix'] . $table;
}
else
{
$table = $this->config['table_prefix'] . $table . ($auto_as_table?' AS '.$table:'');
}
}
return $this->_quote_identifier($value);
}
/**
* 创建一个数据库
*
* @param string $database
* @param string $charset 编码，不传则使用数据库连接配置相同到编码
* @param string $collate 整理格式
* @return boolean
* @throws Exception
*/
public function create_database($database, $charset = null, $collate=null)
{
$config = $this->config;
$this->config['connection']['database'] = null;
if (!$charset)
{
$charset = $this->config['charset'];
}
$sql = 'CREATE DATABASE ' . $this->_quote_identifier($database) . ' DEFAULT CHARACTER SET ' . $charset;
if ($collate)
{
$sql .= ' COLLATE '.$collate;
}
try
{
$result = $this->query($sql, null, true)->result();
$this->config = $config;
return $result;
}
catch (Exception $e)
{
$this->config = $config;
throw $e;
}
}
protected function _quote_identifier($column)
{
if (is_array($column))
{
list($column, $alias) = $column;
}
if (is_object($column))
{
if ($column instanceof Database)
{
// Create a sub-query
$column = '(' . $column->compile() . ')';
}
elseif ($column instanceof Database_Expression)
{
// Use a raw expression
$column = $column->value();
}
else
{
// Convert the object to a string
$column = $this->_quote_identifier((string)$column);
}
}
else
{
# 转换为字符串
$column = trim((string)$column);
if (preg_match('#^(.*) AS (.*)$#i', $column, $m))
{
$column = $m[1];
$alias = $m[2];
}
if ($column === '*')
{
return $column;
}
elseif (strpos($column, '"') !== false)
{
// Quote the column in FUNC("column") identifiers
$column = preg_replace('/"(.+?)"/e', '$this->_quote_identifier("$1")', $column);
}
elseif (strpos($column, '.') !== false)
{
$parts = explode('.', $column);
$prefix = $this->config['table_prefix'];
if ($prefix)
{
// Get the offset of the table name, 2nd-to-last part
$offset = count($parts) - 2;
if (!$this->_as_table || !in_array($parts[$offset], $this->_as_table))
{
$parts[$offset] = $prefix . $parts[$offset];
}
}
foreach ($parts as & $part)
{
if ($part !== '*')
{
// Quote each of the parts
$this->_change_charset($part);
$part = $this->_identifier . str_replace($this->_identifier, '', $part) . $this->_identifier;
}
}
$column = implode('.', $parts);
}
else
{
$this->_change_charset($column);
$column = $this->_identifier . str_replace($this->_identifier, '', $column) . $this->_identifier;
}
}
if (isset($alias))
{
$this->_change_charset($alias);
$column .= ' AS ' . $this->_identifier . str_replace($this->_identifier, '', $alias) . $this->_identifier;
}
return $column;
}
protected function _compile_select($builder)
{
$quote_ident = array($this, '_quote_identifier');
$quote_table = array($this, 'quote_table');
$query = 'SELECT ';
if ($builder['distinct'])
{
if (true===$builder['distinct'])
{
$query .= 'DISTINCT ';
}
else
{
$builder['select_adv'][] = array
(
$builder['distinct'],
'distinct',
);
}
}
$this->_init_as_table($builder);
$this->format_select_adv($builder);
$this->format_group_concat($builder);
if (empty($builder['select']))
{
$query .= '*';
}
else
{
$query .= implode(', ', array_unique(array_map($quote_ident, $builder['select'])));
}
if (!empty($builder['from']))
{
// Set tables to select from
$query .= ' FROM ' . implode(', ', array_unique(array_map($quote_table, $builder['from'], array(true))));
}
if (!empty($builder['index']))
{
foreach ($builder['index'] as $item)
{
$query .= ' '. strtoupper($item[1]) .' INDEX('.$this->_quote_identifier($item[0]) .')';
}
}
if (!empty($builder['join']))
{
// Add tables to join
$query .= ' ' . $this->_compile_join($builder['join']);
}
if (!empty($builder['where']))
{
// Add selection conditions
$query .= ' WHERE ' . $this->_compile_conditions($builder['where']);
}
if (!empty($builder['group_by']))
{
// Add sorting
$query .= ' GROUP BY ' . implode(', ', array_map($quote_ident, $builder['group_by']));
}
if (!empty($builder['having']))
{
// Add filtering conditions
$query .= ' HAVING ' . $this->_compile_conditions($builder['having']);
}
if (!empty($builder['order_by']))
{
// Add sorting
$query .= ' ' . $this->_compile_order_by($builder['order_by']);
}
elseif ($builder['where'])
{
# 如果查询中有in查询，采用自动排序方式
$in_query = null;
foreach ($builder['where'] as $item)
{
if (isset($item['AND']) && $item['AND'][1] == 'in')
{
if (count($item['AND'][1]) > 1)
{
# 大于1项才需要排序
$in_query = $item['AND'];
}
break;
}
}
if ($in_query)
{
$query .= ' ORDER BY FIELD(' . $this->_quote_identifier($in_query[0]) . ', ' . implode(', ', $this->quote($in_query[2])) . ')';
}
}
if ($builder['limit'] !== null)
{
// Add limiting
$query .= ' LIMIT ' . $builder['limit'];
}
if ($builder['offset'] !== null)
{
// Add offsets
$query .= ' OFFSET ' . $builder['offset'];
}
return $query;
}
/**
* Compile the SQL query and return it.
*
* @return string
*/
protected function _compile_insert($builder, $type = 'INSERT')
{
if ($type != 'REPLACE')
{
$type = 'INSERT';
}
// Start an insertion query
$query = $type . ' INTO ' . $this->quote_table($builder['table'], false);
// Add the column names
$query .= ' (' . implode(', ', array_map(array($this, '_quote_identifier'), $builder['columns'])) . ') ';
if (is_array($builder['values']))
{
// Callback for quoting values
$quote = array($this, 'quote');
$groups = array();
foreach ($builder['values'] as $group)
{
$groups[] = '(' . implode(', ', array_map($quote, $group)) . ')';
}