Connection::connect() - Code Metrics - Inspection of "改进" - top-think/framework - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — 6.0 ( 7fd508...a1342f )

by liu
created 2019-06-12 08:46 UTC
Connection::connect() B

↳ Parent: Connection
Complexity

Conditions	9
Paths	177
Size

Total Lines	43
Code Lines	26
Duplication

Lines	0
Ratio	0 %
Code Coverage

Tests	0
CRAP Score	90
Importance

Changes
Metric	Value
cc	9
eloc	26
nc	177
nop	3
dl	0
loc	43
ccs	0
cts	22
cp	0
crap	90
rs	7.4138
c	0
b	0
f	0
<?php
// +----------------------------------------------------------------------

// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2019 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <[email protected]>
// +----------------------------------------------------------------------
declare (strict_types = 1);

namespace think\db;

use PDO;
use PDOStatement;
use think\Cache;
use think\cache\CacheItem;
use think\Container;
use think\Db;
use think\db\exception\BindParamException;
use think\Exception;
use think\exception\PDOException;
use think\Log;

/**
 * 数据库连接基础类
 */

abstract class Connection
{
    const PARAM_FLOAT = 21;

    /**
     * PDO操作实例
     * @var PDOStatement
     */
    protected $PDOStatement;

    /**
     * 当前SQL指令
     * @var string
     */
    protected $queryStr = '';

    /**
     * 返回或者影响记录数
     * @var int
     */
    protected $numRows = 0;

    /**
     * 事务指令数
     * @var int
     */
    protected $transTimes = 0;

    /**
     * 错误信息
     * @var string
     */
    protected $error = '';

    /**
     * 数据库连接ID 支持多个连接
     * @var PDO[]
     */
    protected $links = [];

    /**
     * 当前连接ID
     * @var PDO
     */
    protected $linkID;

    /**
     * 当前读连接ID
     * @var PDO
     */
    protected $linkRead;

    /**
     * 当前写连接ID
     * @var PDO
     */
    protected $linkWrite;

    /**
     * 查询结果类型
     * @var int
     */
    protected $fetchType = PDO::FETCH_ASSOC;

    /**
     * 字段属性大小写
     * @var int
     */
    protected $attrCase = PDO::CASE_LOWER;

    /**
     * 数据表信息
     * @var array
     */
    protected $info = [];

    /**
     * 查询开始时间
     * @var float
     */
    protected $queryStartTime;

    /**
     * Builder对象
     * @var Builder
     */
    protected $builder;

    /**
     * Db对象
     * @var Db
     */
    protected $db;

    /**
     * 是否读取主库
     * @var bool
     */
    protected $readMaster = false;

    /**
     * 数据库连接参数配置
     * @var array
     */
    protected $config = [
        // 数据库类型
        'type'            => '',
        // 服务器地址
        'hostname'        => '',
        // 数据库名
        'database'        => '',
        // 用户名
        'username'        => '',
        // 密码
        'password'        => '',
        // 端口
        'hostport'        => '',
        // 连接dsn
        'dsn'             => '',
        // 数据库连接参数
        'params'          => [],
        // 数据库编码默认采用utf8
        'charset'         => 'utf8',
        // 数据库表前缀
        'prefix'          => '',
        // 数据库调试模式
        'debug'           => false,
        // 数据库部署方式:0 集中式(单一服务器),1 分布式(主从服务器)
        'deploy'          => 0,
        // 数据库读写是否分离 主从式有效
        'rw_separate'     => false,
        // 读写分离后 主服务器数量
        'master_num'      => 1,
        // 指定从服务器序号
        'slave_no'        => '',
        // 模型写入后自动读取主服务器
        'read_master'     => false,
        // 是否严格检查字段是否存在
        'fields_strict'   => true,
        // 自动写入时间戳字段
        'auto_timestamp'  => false,
        // 时间字段取出后的默认时间格式
        'datetime_format' => 'Y-m-d H:i:s',
        // 是否需要进行SQL性能分析
        'sql_explain'     => false,
        // Builder类
        'builder'         => '',
        // Query类
        'query'           => '',
        // 是否需要断线重连
        'break_reconnect' => false,
        // 断线标识字符串
        'break_match_str' => [],
    ];

    /**
     * PDO连接参数
     * @var array
     */
    protected $params = [
        PDO::ATTR_CASE              => PDO::CASE_NATURAL,
        PDO::ATTR_ERRMODE           => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_ORACLE_NULLS      => PDO::NULL_NATURAL,
        PDO::ATTR_STRINGIFY_FETCHES => false,
        PDO::ATTR_EMULATE_PREPARES  => false,
    ];

    /**
     * 参数绑定类型映射
     * @var array
     */
    protected $bindType = [
        'string'  => PDO::PARAM_STR,
        'str'     => PDO::PARAM_STR,
        'integer' => PDO::PARAM_INT,
        'int'     => PDO::PARAM_INT,
        'boolean' => PDO::PARAM_BOOL,
        'bool'    => PDO::PARAM_BOOL,
        'float'   => self::PARAM_FLOAT,
    ];

    /**
     * 服务器断线标识字符
     * @var array
     */
    protected $breakMatchStr = [
        'server has gone away',
        'no connection to the server',
        'Lost connection',
        'is dead or not enabled',
        'Error while sending',
        'decryption failed or bad record mac',
        'server closed the connection unexpectedly',
        'SSL connection has been closed unexpectedly',
        'Error writing data to the connection',
        'Resource deadlock avoided',
        'failed with errno',
    ];

    /**
     * 绑定参数
     * @var array
     */
    protected $bind = [];

    /**
     * 缓存对象
     * @var Cache
     */
    protected $cache;

    /**
     * 日志对象
     * @var Log
     */
    protected $log;

    /**
     * 架构函数 读取数据库配置信息
     * @access public
     * @param Cache $cache 缓存对象

     * @param Log   $log 日志对象

     * @param array $config 数据库配置数组

     */
    public function __construct(Cache $cache, Log $log, array $config = [])
    {
        if (!empty($config)) {
            $this->config = array_merge($this->config, $config);
        }

        // 创建Builder对象
        $class = $this->getBuilderClass();

        $this->builder = new $class($this);
        $this->cache   = $cache;
        $this->log     = $log;

        // 执行初始化操作
        $this->initialize();
    }

    /**
     * 初始化
     * @access protected
     * @return void
     */
    protected function initialize(): void
    {
    }

    /**
     * 获取当前连接器类对应的Query类
     * @access public
     * @return string
     */
    public function getQueryClass(): string
    {
        return $this->getConfig('query') ?: Query::class;
    }

    /**
     * 获取当前连接器类对应的Builder类
     * @access public
     * @return string
     */
    public function getBuilderClass(): string
    {
        return $this->getConfig('builder') ?: '\\think\\db\\builder\\' . ucfirst($this->getConfig('type'));
    }

    /**
     * 设置当前的数据库Builder对象
     * @access protected
     * @param Builder $builder

     * @return void
     */
    protected function setBuilder(Builder $builder): void
    {
        $this->builder = $builder;
    }

    /**
     * 获取当前的builder实例对象
     * @access public
     * @return Builder
     */
    public function getBuilder(): Builder
    {
        return $this->builder;
    }

    /**
     * 设置当前的数据库Db对象
     * @access public
     * @param Db $db

     * @return void
     */
    public function setDb(Db $db): void
    {
        $this->db = $db;
    }

    /**
     * 解析pdo连接的dsn信息
     * @access protected
     * @param array $config 连接信息

     * @return string
     */
    abstract protected function parseDsn(array $config);

    /**
     * 取得数据表的字段信息
     * @access public
     * @param string $tableName 数据表名称

     * @return array
     */
    abstract public function getFields(string $tableName);

    /**
     * 取得数据库的表信息
     * @access public
     * @param string $dbName 数据库名称

     * @return array
     */
    abstract public function getTables(string $dbName);

    /**
     * SQL性能分析
     * @access protected
     * @param string $sql SQL语句

     * @return array
     */
    abstract protected function getExplain(string $sql);

    /**
     * 对返数据表字段信息进行大小写转换出来
     * @access public
     * @param array $info 字段信息

     * @return array
     */
    public function fieldCase(array $info): array
    {
        // 字段大小写转换
        switch ($this->attrCase) {
            case PDO::CASE_LOWER:

                $info = array_change_key_case($info);
                break;
            case PDO::CASE_UPPER:

                $info = array_change_key_case($info, CASE_UPPER);
                break;
            case PDO::CASE_NATURAL:

            default:

                // 不做转换
        }

        return $info;
    }

    /**
     * 获取字段绑定类型
     * @access public
     * @param string $type 字段类型

     * @return integer
     */
    public function getFieldBindType(string $type): int
    {
        if (in_array($type, ['integer', 'string', 'float', 'boolean', 'bool', 'int', 'str'])) {
            $bind = $this->bindType[$type];
        } elseif (0 === strpos($type, 'set') || 0 === strpos($type, 'enum')) {
            $bind = PDO::PARAM_STR;
        } elseif (preg_match('/(double|float|decimal|real|numeric)/is', $type)) {
            $bind = self::PARAM_FLOAT;
        } elseif (preg_match('/(int|serial|bit)/is', $type)) {
            $bind = PDO::PARAM_INT;
        } elseif (preg_match('/bool/is', $type)) {
            $bind = PDO::PARAM_BOOL;
        } else {
            $bind = PDO::PARAM_STR;
        }

        return $bind;
    }

    /**
     * 获取数据表信息
     * @access public
     * @param mixed  $tableName 数据表名 留空自动获取

     * @param string $fetch     获取信息类型 包括 fields type bind pk

     * @return mixed
     */
    public function getTableInfo($tableName, string $fetch = '')
    {
        if (is_array($tableName)) {
            $tableName = key($tableName) ?: current($tableName);
        }

        if (strpos($tableName, ',')) {
            // 多表不获取字段信息
            return [];
        }

        // 修正子查询作为表名的问题
        if (strpos($tableName, ')')) {
            return [];
        }

        list($tableName) = explode(' ', $tableName);

        if (!strpos($tableName, '.')) {
            $schema = $this->getConfig('database') . '.' . $tableName;
        } else {
            $schema = $tableName;
        }

        if (!isset($this->info[$schema])) {
            // 读取缓存
            $cacheFile = Container::pull('app')->getRuntimePath() . 'schema' . DIRECTORY_SEPARATOR . $schema . '.php';

            if (!$this->config['debug'] && is_file($cacheFile)) {
                $info = include $cacheFile;
            } else {
                $info = $this->getFields($tableName);
            }

            $fields = array_keys($info);
            $bind   = $type   = [];

            foreach ($info as $key => $val) {
                // 记录字段类型
                $type[$key] = $val['type'];
                $bind[$key] = $this->getFieldBindType($val['type']);

                if (!empty($val['primary'])) {
                    $pk[] = $key;
                }
            }

            if (isset($pk)) {
                // 设置主键
                $pk = count($pk) > 1 ? $pk : $pk[0];
            } else {
                $pk = null;
            }

            $this->info[$schema] = ['fields' => $fields, 'type' => $type, 'bind' => $bind, 'pk' => $pk];
        }

        return $fetch ? $this->info[$schema][$fetch] : $this->info[$schema];
    }

    /**
     * 获取数据表的主键
     * @access public
     * @param mixed $tableName 数据表名

     * @return string|array
     */
    public function getPk($tableName)
    {
        return $this->getTableInfo($tableName, 'pk');
    }

    /**
     * 获取数据表字段信息
     * @access public
     * @param mixed $tableName 数据表名

     * @return array
     */
    public function getTableFields($tableName): array
    {
        return $this->getTableInfo($tableName, 'fields');
    }

    /**
     * 获取数据表字段类型
     * @access public
     * @param mixed  $tableName 数据表名

     * @param string $field     字段名

     * @return array|string
     */
    public function getFieldsType($tableName, string $field = null)
    {
        $result = $this->getTableInfo($tableName, 'type');

        if ($field && isset($result[$field])) {
            return $result[$field];
        }

        return $result;
    }

    /**
     * 获取数据表绑定信息
     * @access public
     * @param mixed $tableName 数据表名

     * @return array
     */
    public function getFieldsBind($tableName): array
    {
        return $this->getTableInfo($tableName, 'bind');
    }

    /**
     * 获取数据库的配置参数
     * @access public
     * @param string $config 配置名称

     * @return mixed
     */
    public function getConfig(string $config = '')
    {
        if ('' === $config) {
            return $this->config;
        }
        return $this->config[$config] ?? null;
    }

    /**
     * 设置数据库的配置参数
     * @access public
     * @param array $config 配置

     * @return void
     */
    public function setConfig(array $config): void
    {
        $this->config = array_merge($this->config, $config);
    }

    /**
     * 连接数据库方法
     * @access public
     * @param array      $config         连接参数

     * @param integer    $linkNum        连接序号

     * @param array|bool $autoConnection 是否自动连接主数据库（用于分布式）

     * @return PDO
     * @throws Exception
     */
    public function connect(array $config = [], $linkNum = 0, $autoConnection = false): PDO
    {
        if (isset($this->links[$linkNum])) {
            return $this->links[$linkNum];
        }

        if (empty($config)) {
            $config = $this->config;
        } else {
            $config = array_merge($this->config, $config);
        }

        // 连接参数
        if (isset($config['params']) && is_array($config['params'])) {
            $params = $config['params'] + $this->params;
        } else {
            $params = $this->params;
        }

        // 记录当前字段属性大小写设置
        $this->attrCase = $params[PDO::ATTR_CASE];

        if (!empty($config['break_match_str'])) {
            $this->breakMatchStr = array_merge($this->breakMatchStr, (array) $config['break_match_str']);
        }

        try {
            if (empty($config['dsn'])) {
                $config['dsn'] = $this->parseDsn($config);
            }

            $startTime             = microtime(true);
            $this->links[$linkNum] = $this->createPdo($config['dsn'], $config['username'], $config['password'], $params);
            // 记录数据库连接信息
            $this->log('[ DB ] CONNECT:[ UseTime:' . number_format(microtime(true) - $startTime, 6) . 's ] ' . $config['dsn']);

            return $this->links[$linkNum];
        } catch (\PDOException $e) {
            if ($autoConnection) {
                $this->log->error($e->getMessage());
                return $this->connect($autoConnection, $linkNum);
                return $this->connect(/** @scrutinizer ignore-type */ $autoConnection, $linkNum);
            } else {
                throw $e;
            }
        }
    }

    /**

     * 创建PDO实例
     * @param $dsn

     * @param $username

     * @param $password

     * @param $params

     * @return PDO
     */
    protected function createPdo($dsn, $username, $password, $params)
    {
        return new PDO($dsn, $username, $password, $params);
    }

    /**
     * 释放查询结果
     * @access public
     */

    public function free(): void
    {
        $this->PDOStatement = null;
    }

    /**
     * 获取PDO对象
     * @access public
     * @return \PDO|false
     */
    public function getPdo()
    {
        if (!$this->linkID) {
            return false;
        }

        return $this->linkID;
    }

    /**
     * 执行查询 使用生成器返回数据
     * @access public
     * @param Query        $query     查询对象

     * @param string       $sql       sql指令

     * @param array        $bind      参数绑定

     * @param \think\Model $model     模型对象实例

     * @param array        $condition 查询条件

     * @return \Generator
     */
    public function getCursor(Query $query, string $sql, array $bind = [], $model = null, $condition = null)
    {
        $this->queryPDOStatement($query, $sql, $bind);

        // 返回结果集
        while ($result = $this->PDOStatement->fetch($this->fetchType)) {
            if ($model) {
                yield $model->newInstance($result, $condition)->setQuery($query);
            } else {
                yield $result;
            }
        }
    }

    /**
     * 执行查询 返回数据集
     * @access public
     * @param Query  $query 查询对象

     * @param string $sql   sql指令

     * @param array  $bind  参数绑定

     * @param bool   $cache 是否支持缓存

     * @return array
     * @throws BindParamException
     * @throws \PDOException
     * @throws \Exception
     * @throws \Throwable
     */
    public function query(Query $query, string $sql, array $bind = [], bool $cache = false): array
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        if ($cache && !empty($options['cache'])) {
            $cacheItem = $this->parseCache($query, $options['cache']);
            $resultSet = $this->cache->get($cacheItem->getKey());

            if (false !== $resultSet) {
                return $resultSet;
            }
        }

        $master    = !empty($options['master']) ? true : false;
        $procedure = !empty($options['procedure']) ? true : in_array(strtolower(substr(trim($sql), 0, 4)), ['call', 'exec']);

        $this->getPDOStatement($sql, $bind, $master, $procedure);

        $resultSet = $this->getResult($procedure);

        if (isset($cacheItem) && $resultSet) {
            // 缓存数据集
            $cacheItem->set($resultSet);
            $this->cacheData($cacheItem);
        }

        return $resultSet;
    }

    /**
     * 执行查询但只返回PDOStatement对象
     * @access public
     * @param Query $query 查询对象

     * @return \PDOStatement
     */
    public function pdo(Query $query): PDOStatement
    {
        $bind = $query->getBind();
        // 生成查询SQL
        $sql = $this->builder->select($query);

        return $this->queryPDOStatement($query, $sql, $bind);
    }

    /**
     * 执行查询但只返回PDOStatement对象
     * @access public
     * @param string $sql       sql指令

     * @param array  $bind      参数绑定

     * @param bool   $master    是否在主服务器读操作

     * @param bool   $procedure 是否为存储过程调用

     * @return PDOStatement
     * @throws BindParamException
     * @throws \PDOException
     * @throws \Exception
     * @throws \Throwable
     */
    public function getPDOStatement(string $sql, array $bind = [], bool $master = false, bool $procedure = false): PDOStatement
    {
        $this->initConnect($this->readMaster ?: $master);

        // 记录SQL语句
        $this->queryStr = $sql;

        $this->bind = $bind;

        $this->db->updateQueryTimes();

        try {
            // 调试开始
            $this->debug(true);

            // 预处理
            $this->PDOStatement = $this->linkID->prepare($sql);
class Id
{
    public $id;

    public function __construct($id)
    {
        $this->id = $id;
    }

}

class Account
{
    /** @var  Id $id */
    public $id;
}

$account_id = false;

if (starsAreRight()) {
    $account_id = new Id(42);
}

$account = new Account();
if ($account instanceof Id)
{
    $account->id = $account_id;
}

            // 参数绑定
            if ($procedure) {
                $this->bindParam($bind);
            } else {
                $this->bindValue($bind);
            }

            // 执行查询
            $this->PDOStatement->execute();

            // 调试结束
            $this->debug(false, '', $master);

            return $this->PDOStatement;

        } catch (\Throwable | \Exception $e) {
            if ($this->isBreak($e)) {
                return $this->close()->getPDOStatement($sql, $bind, $master, $procedure);
            }

            if ($e instanceof \PDOException) {
                throw new PDOException($e, $this->config, $this->getLastsql());
            } else {
                throw $e;
            }
        }
    }

    /**
     * 执行语句
     * @access public
     * @param Query  $query  查询对象

     * @param string $sql    sql指令

     * @param array  $bind   参数绑定

     * @param bool   $origin 是否原生查询

     * @return int
     * @throws BindParamException
     * @throws \PDOException
     * @throws \Exception
     * @throws \Throwable
     */
    public function execute(Query $query, string $sql, array $bind = [], bool $origin = false): int
    {
        $this->queryPDOStatement($query->master(true), $sql, $bind);

        if (!$origin && !empty($this->config['deploy']) && !empty($this->config['read_master'])) {
            $this->readMaster = true;
        }

        $this->numRows = $this->PDOStatement->rowCount();

        return $this->numRows;
    }

    protected function queryPDOStatement(Query $query, string $sql, array $bind = []): PDOStatement

    {
        $options   = $query->getOptions();
        $master    = !empty($options['master']) ? true : false;
        $procedure = !empty($options['procedure']) ? true : in_array(strtolower(substr(trim($sql), 0, 4)), ['call', 'exec']);

        return $this->getPDOStatement($sql, $bind, $master, $procedure);
    }

    /**
     * 查找单条记录
     * @access public
     * @param Query $query 查询对象

     * @return array
     * @throws DbException
     * @throws ModelNotFoundException
     * @throws DataNotFoundException
     */
    public function find(Query $query): array
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        if (!empty($options['cache'])) {
            // 判断查询缓存
            $cacheItem = $this->parseCache($query, $options['cache']);
            $key       = $cacheItem->getKey();
        }

        if (isset($key)) {
            $result = $this->cache->get($key);

            if (false !== $result) {
                return $result;
            }
        }

        // 生成查询SQL
        $sql = $this->builder->select($query, true);

        // 事件回调
        $result = $this->db->trigger('before_find', $query);

        if (!$result) {
            // 执行查询
            $resultSet = $this->query($query, $sql, $query->getBind());

            $result = $resultSet[0] ?? [];
        }

        if (isset($cacheItem) && $result) {
            // 缓存数据
            $cacheItem->set($result);
            $this->cacheData($cacheItem);
        }

        return $result;
    }

    /**
     * 使用游标查询记录
     * @access public
     * @param Query $query 查询对象

     * @return \Generator
     */
    public function cursor(Query $query)
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        // 生成查询SQL
        $sql = $this->builder->select($query);

        $condition = $options['where']['AND'] ?? null;

        // 执行查询操作
        return $this->getCursor($query, $sql, $query->getBind(), $query->getModel(), $condition);
    }

    /**
     * 查找记录
     * @access public
     * @param Query $query 查询对象

     * @return array
     * @throws DbException
     * @throws ModelNotFoundException
     * @throws DataNotFoundException
     */
    public function select(Query $query): array
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        if (!empty($options['cache'])) {
            $cacheItem = $this->parseCache($query, $options['cache']);
            $resultSet = $this->getCacheData($cacheItem);

            if (false !== $resultSet) {
                return $resultSet;
            }
        }

        // 生成查询SQL
        $sql = $this->builder->select($query);

        $resultSet = $this->db->trigger('before_select', $query);

        if (!$resultSet) {
            // 执行查询操作
            $resultSet = $this->query($query, $sql, $query->getBind());
        }

        if (isset($cacheItem) && false !== $resultSet) {
            // 缓存数据集
            $cacheItem->set($resultSet);
            $this->cacheData($cacheItem);
        }

        return $resultSet;

    }

    /**
     * 插入记录
     * @access public
     * @param Query   $query        查询对象

     * @param boolean $getLastInsID 返回自增主键

     * @return mixed
     */
    public function insert(Query $query, bool $getLastInsID = false)
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        // 生成SQL语句
        $sql = $this->builder->insert($query);

        // 执行操作
        $result = '' == $sql ? 0 : $this->execute($query, $sql, $query->getBind());

        if ($result) {
            $sequence  = $options['sequence'] ?? null;
            $lastInsId = $query->getLastInsID($sequence);

            $data = $options['data'];

            if ($lastInsId) {
                $pk = $query->getPk();
                if (is_string($pk)) {
                    $data[$pk] = $lastInsId;
                }
            }

            $query->setOption('data', $data);

            $this->db->trigger('after_insert', $query);

            if ($getLastInsID) {
                return $lastInsId;
            }
        }

        return $result;
    }

    /**
     * 批量插入记录
     * @access public
     * @param Query   $query   查询对象

     * @param mixed   $dataSet 数据集

     * @param integer $limit   每次写入数据限制

     * @return integer
     * @throws \Exception
     * @throws \Throwable
     */
    public function insertAll(Query $query, array $dataSet = [], int $limit = 0): int
    {
        if (!is_array(reset($dataSet))) {
            return 0;
        }

        $query->parseOptions();

        if ($limit) {
            // 分批写入 自动启动事务支持
            $this->startTrans();

            try {
                $array = array_chunk($dataSet, $limit, true);
                $count = 0;

                foreach ($array as $item) {
                    $sql = $this->builder->insertAll($query, $item);
                    $count += $this->execute($query, $sql, $query->getBind());
                }

                // 提交事务
                $this->commit();
            } catch (\Exception | \Throwable $e) {
                $this->rollback();
                throw $e;
            }

            return $count;
        }

        $sql = $this->builder->insertAll($query, $dataSet);

        return $this->execute($query, $sql, $query->getBind());
    }

    /**
     * 通过Select方式插入记录
     * @access public
     * @param Query  $query  查询对象

     * @param array  $fields 要插入的数据表字段名

     * @param string $table  要插入的数据表名

     * @return integer
     * @throws PDOException
     */
    public function selectInsert(Query $query, array $fields, string $table): int
    {
        // 分析查询表达式
        $query->parseOptions();

        $sql = $this->builder->selectInsert($query, $fields, $table);

        return $this->execute($query, $sql, $query->getBind());
    }

    /**
     * 更新记录
     * @access public
     * @param Query $query 查询对象

     * @return integer
     * @throws Exception
     * @throws PDOException
     */
    public function update(Query $query): int
    {
        $options = $query->parseOptions();

        if (isset($options['cache'])) {
            $cacheItem = $this->parseCache($query, $options['cache']);
            $key       = $cacheItem->getKey();
            $tag       = $cacheItem->getTag();
        }

        // 生成UPDATE SQL语句
        $sql = $this->builder->update($query);

        // 检测缓存
        if (isset($key) && $this->cache->get($key)) {
            // 删除缓存
            $this->cache->delete($key);
        } elseif (!empty($tag)) {
            $this->cache->tag($tag)->clear();
        }

        // 执行操作
        $result = '' == $sql ? 0 : $this->execute($query, $sql, $query->getBind());

        if ($result) {
            $this->db->trigger('after_update', $query);
        }

        return $result;
    }

    /**
     * 删除记录
     * @access public
     * @param Query $query 查询对象

     * @return int
     * @throws Exception
     * @throws PDOException
     */
    public function delete(Query $query): int
    {
        // 分析查询表达式
        $options = $query->parseOptions();

        if (isset($options['cache'])) {
            $cacheItem = $this->parseCache($query, $options['cache']);
            $key       = $cacheItem->getKey();
            $tag       = $cacheItem->getTag();
        }

        // 生成删除SQL语句
        $sql = $this->builder->delete($query);

        // 检测缓存
        if (isset($key) && $this->cache->get($key)) {
            // 删除缓存
            $this->cache->delete($key);
        } elseif (!empty($tag)) {
            $this->cache->tag($tag)->clear();
        }

        // 执行操作
        $result = $this->execute($query, $sql, $query->getBind());

        if ($result) {
            $this->db->trigger('after_delete', $query);
        }

        return $result;
    }

    /**
     * 得到某个字段的值
     * @access public
     * @param Query  $query   查询对象

     * @param string $field   字段名

     * @param mixed  $default 默认值

     * @param bool   $one     返回一个值

     * @return mixed
     */
    public function value(Query $query, string $field, $default = null, bool $one = true)
    {
        $options = $query->parseOptions();

        if (isset($options['field'])) {
            $query->removeOption('field');
        }

        $query->setOption('field', (array) $field);

        if (!empty($options['cache'])) {
            $cacheItem = $this->parseCache($query, $options['cache']);
            $result    = $this->getCacheData($cacheItem);

            if (false !== $result) {
                return $result;
            }
        }

        // 生成查询SQL
        $sql = $this->builder->select($query, $one);

        if (isset($options['field'])) {
            $query->setOption('field', $options['field']);
        } else {
            $query->removeOption('field');
        }

        // 执行查询操作
        $pdo = $this->getPDOStatement($sql, $query->getBind(), $options['master']);

        $result = $pdo->fetchColumn();

        if (isset($cacheItem) && false !== $result) {
            // 缓存数据
            $cacheItem->set($result);
            $this->cacheData($cacheItem);
        }

        return false !== $result ? $result : $default;
    }

    /**
     * 得到某个字段的值
     * @access public
     * @param Query  $query     查询对象

     * @param string $aggregate 聚合方法

     * @param mixed  $field     字段名

     * @param bool   $force     强制转为数字类型

     * @return mixed
     */
    public function aggregate(Query $query, string $aggregate, $field, bool $force = false)
    {
        if (is_string($field) && 0 === stripos($field, 'DISTINCT ')) {
            list($distinct, $field) = explode(' ', $field);
        }

        $field = $aggregate . '(' . (!empty($distinct) ? 'DISTINCT ' : '') . $this->builder->parseKey($query, $field, true) . ') AS tp_' . strtolower($aggregate);

        $result = $this->value($query, $field, 0, false);

        return $force ? (float) $result : $result;
    }

    /**
     * 得到某个列的数组
     * @access public
     * @param Query  $query  查询对象

     * @param string $column 字段名 多个字段用逗号分隔

     * @param string $key    索引

     * @return array
     */
    public function column(Query $query, string $column, string $key = ''): array
    {
        $options = $query->parseOptions();

        if (isset($options['field'])) {
            $query->removeOption('field');
        }

        if ($key && '*' != $column) {
            $field = $key . ',' . $column;
        } else {
            $field = $column;
        }

        $field = array_map('trim', explode(',', $field));

        $query->setOption('field', $field);

        if (!empty($options['cache'])) {
            // 判断查询缓存
            $cacheItem = $this->parseCache($query, $options['cache']);
            $result    = $this->getCacheData($cacheItem);

            if (false !== $result) {
                return $result;
            }
        }

        // 生成查询SQL
        $sql = $this->builder->select($query);

        if (isset($options['field'])) {
            $query->setOption('field', $options['field']);
        } else {
            $query->removeOption('field');
        }

        // 执行查询操作
        $pdo = $this->getPDOStatement($sql, $query->getBind(), $options['master']);

        $resultSet = $pdo->fetchAll(PDO::FETCH_ASSOC);

        if (empty($resultSet)) {
            $result = [];
        } elseif (('*' == $column || strpos($column, ',')) && $key) {
            $result = array_column($resultSet, null, $key);
        } else {
            $fields = array_keys($resultSet[0]);
            $key    = $key ?: array_shift($fields);

            if (strpos($key, '.')) {
                list($alias, $key) = explode('.', $key);
            }

            $result = array_column($resultSet, $column, $key);
        }

        if (isset($cacheItem)) {
            // 缓存数据
            $cacheItem->set($result);
            $this->cacheData($cacheItem);
        }

        return $result;
    }

    /**
     * 根据参数绑定组装最终的SQL语句 便于调试
     * @access public
     * @param string $sql  带参数绑定的sql语句

     * @param array  $bind 参数绑定列表

     * @return string
     */
    public function getRealSql(string $sql, array $bind = []): string
    {
        foreach ($bind as $key => $val) {
            $value = is_array($val) ? $val[0] : $val;
            $type  = is_array($val) ? $val[1] : PDO::PARAM_STR;

            if ((self::PARAM_FLOAT == $type || PDO::PARAM_STR == $type) && is_string($value)) {
                $value = '\'' . addslashes($value) . '\'';
            } elseif (PDO::PARAM_INT == $type && '' === $value) {
                $value = 0;
            }

            // 判断占位符
            $sql = is_numeric($key) ?
            substr_replace($sql, $value, strpos($sql, '?'), 1) :
            substr_replace($sql, $value, strpos($sql, ':' . $key), strlen(':' . $key));
        }

        return rtrim($sql);
    }

    /**
     * 参数绑定
     * 支持 ['name'=>'value','id'=>123] 对应命名占位符
     * 或者 ['value',123] 对应问号占位符
     * @access public
     * @param array $bind 要绑定的参数列表

     * @return void
     * @throws BindParamException
     */
    protected function bindValue(array $bind = []): void
    {
        foreach ($bind as $key => $val) {
            // 占位符
            $param = is_numeric($key) ? $key + 1 : ':' . $key;

            if (is_array($val)) {
                if (PDO::PARAM_INT == $val[1] && '' === $val[0]) {
                    $val[0] = 0;
                } elseif (self::PARAM_FLOAT == $val[1]) {
                    $val[0] = is_string($val[0]) ? (float) $val[0] : $val[0];
                    $val[1] = PDO::PARAM_STR;
                }

                $result = $this->PDOStatement->bindValue($param, $val[0], $val[1]);
            } else {
                $result = $this->PDOStatement->bindValue($param, $val);
            }

            if (!$result) {
                throw new BindParamException(
                    "Error occurred  when binding parameters '{$param}'",
                    $this->config,
                    $this->getLastsql(),
                    $bind
                );
            }
        }
    }

    /**
     * 存储过程的输入输出参数绑定
     * @access public
     * @param array $bind 要绑定的参数列表

     * @return void
     * @throws BindParamException
     */
    protected function bindParam(array $bind): void
    {
        foreach ($bind as $key => $val) {
            $param = is_numeric($key) ? $key + 1 : ':' . $key;

            if (is_array($val)) {
                array_unshift($val, $param);
                $result = call_user_func_array([$this->PDOStatement, 'bindParam'], $val);
            } else {
                $result = $this->PDOStatement->bindValue($param, $val);
            }

            if (!$result) {
                $param = array_shift($val);

                throw new BindParamException(
                    "Error occurred  when binding parameters '{$param}'",
                    $this->config,
                    $this->getLastsql(),
                    $bind
                );
            }
        }
    }

    /**
     * 获得数据集数组
     * @access protected
     * @param bool $procedure 是否存储过程

     * @return array
     */
    protected function getResult(bool $procedure = false): array
    {
        if ($procedure) {
            // 存储过程返回结果
            return $this->procedure();
        }

        $result = $this->PDOStatement->fetchAll($this->fetchType);

        $this->numRows = count($result);

        return $result;
    }

    /**
     * 获得存储过程数据集
     * @access protected
     * @return array
     */
    protected function procedure(): array
    {
        $item = [];

        do {
            $result = $this->getResult();
            if (!empty($result)) {
                $item[] = $result;
            }
        } while ($this->PDOStatement->nextRowset());

        $this->numRows = count($item);

        return $item;
    }

    /**
     * 执行数据库事务
     * @access public
     * @param callable $callback 数据操作方法回调

     * @return mixed
     * @throws PDOException
     * @throws \Exception
     * @throws \Throwable
     */
    public function transaction(callable $callback)
    {
        $this->startTrans();

        try {
            $result = null;
            if (is_callable($callback)) {
                $result = call_user_func_array($callback, [$this]);
            }

            $this->commit();
            return $result;
        } catch (\Exception | \Throwable $e) {
            $this->rollback();
            throw $e;
        }
    }

    /**
     * 启动事务
     * @access public
     * @return void
     * @throws \PDOException
     * @throws \Exception
     */
    public function startTrans(): void
    {
        $this->initConnect(true);

        ++$this->transTimes;

        try {
            if (1 == $this->transTimes) {
                $this->linkID->beginTransaction();
            } elseif ($this->transTimes > 1 && $this->supportSavepoint()) {
                $this->linkID->exec(
                    $this->parseSavepoint('trans' . $this->transTimes)
                );
            }
        } catch (\Exception $e) {
            if ($this->isBreak($e)) {
                --$this->transTimes;
                $this->close()->startTrans();
            }
            throw $e;
        }
    }

    /**
     * 用于非自动提交状态下面的查询提交
     * @access public
     * @return void
     * @throws PDOException
     */
    public function commit(): void
    {
        $this->initConnect(true);

        if (1 == $this->transTimes) {
            $this->linkID->commit();
        }

        --$this->transTimes;
    }

    /**
     * 事务回滚
     * @access public
     * @return void
     * @throws PDOException
     */
    public function rollback(): void
    {
        $this->initConnect(true);

        if (1 == $this->transTimes) {
            $this->linkID->rollBack();
        } elseif ($this->transTimes > 1 && $this->supportSavepoint()) {
            $this->linkID->exec(
                $this->parseSavepointRollBack('trans' . $this->transTimes)
            );
        }

        $this->transTimes = max(0, $this->transTimes - 1);
    }

    /**
     * 是否支持事务嵌套
     * @return bool
     */
    protected function supportSavepoint(): bool
    {
        return false;
    }

    /**
     * 生成定义保存点的SQL
     * @access protected
     * @param string $name 标识

     * @return string
     */
    protected function parseSavepoint(string $name): string
    {
        return 'SAVEPOINT ' . $name;
    }

    /**
     * 生成回滚到保存点的SQL
     * @access protected
     * @param string $name 标识

     * @return string
     */
    protected function parseSavepointRollBack(string $name): string
    {
        return 'ROLLBACK TO SAVEPOINT ' . $name;
    }

    /**
     * 批处理执行SQL语句
     * 批处理的指令都认为是execute操作
     * @access public
     * @param Query $query    查询对象

     * @param array $sqlArray SQL批处理指令

     * @param array $bind     参数绑定

     * @return bool
     */
    public function batchQuery(Query $query, array $sqlArray = [], array $bind = []): bool
    {
        // 自动启动事务支持
        $this->startTrans();

        try {
            foreach ($sqlArray as $sql) {
                $this->execute($query, $sql, $bind);
            }
            // 提交事务
            $this->commit();
        } catch (\Exception $e) {
            $this->rollback();
            throw $e;
        }

        return true;
    }

    /**
     * 关闭数据库（或者重新连接）
     * @access public
     * @return $this
     */
    public function close()
    {
        $this->linkID    = null;
        $this->linkWrite = null;
        $this->linkRead  = null;
        $this->links     = [];

        $this->free();

        return $this;
    }

    /**
     * 是否断线
     * @access protected
     * @param \PDOException|\Exception $e 异常对象

     * @return bool
     */
    protected function isBreak($e): bool
    {
        if (!$this->config['break_reconnect']) {
            return false;
        }

        $error = $e->getMessage();

        foreach ($this->breakMatchStr as $msg) {
            if (false !== stripos($error, $msg)) {
                return true;
            }
        }

        return false;
    }

    /**
     * 获取最近一次查询的sql语句
     * @access public
     * @return string
     */
    public function getLastSql(): string
    {
        return $this->getRealSql($this->queryStr, $this->bind);
    }

    /**
     * 获取最近插入的ID
     * @access public
     * @param string $sequence 自增序列名

     * @return string
     */
    public function getLastInsID(string $sequence = null): string
    {
        return $this->linkID->lastInsertId($sequence);
    }

    /**
     * 获取返回或者影响的记录数
     * @access public
     * @return integer
     */
    public function getNumRows(): int
    {
        return $this->numRows;
    }

    /**
     * 获取最近的错误信息
     * @access public
     * @return string
     */
    public function getError(): string
    {
        if ($this->PDOStatement) {
            $error = $this->PDOStatement->errorInfo();
            $error = $error[1] . ':' . $error[2];
        } else {
            $error = '';
        }

        if ('' != $this->queryStr) {
            $error .= "\n [ SQL语句 ] : " . $this->getLastsql();
        }

        return $error;
    }

    /**
     * 数据库调试 记录当前SQL及分析性能
     * @access protected
     * @param boolean $start  调试开始标记 true 开始 false 结束

     * @param string  $sql    执行的SQL语句 留空自动获取

     * @param bool    $master 主从标记

     * @return void
     */
    protected function debug(bool $start, string $sql = '', bool $master = false): void
    {
        if (!empty($this->config['debug'])) {
            // 开启数据库调试模式
            if ($start) {
                $this->queryStartTime = microtime(true);
            } else {
                // 记录操作结束时间
                $runtime = number_format((microtime(true) - $this->queryStartTime), 6);
                $sql     = $sql ?: $this->getLastsql();
                $result  = [];

                // SQL性能分析
                if ($this->config['sql_explain'] && 0 === stripos(trim($sql), 'select')) {
                    $result = $this->getExplain($sql);
                }

                // SQL监听
                $this->triggerSql($sql, $runtime, $result, $master);
            }
        }
    }

    /**
     * 触发SQL事件
     * @access protected
     * @param string $sql     SQL语句

     * @param string $runtime SQL运行时间

     * @param mixed  $explain SQL分析

     * @param bool   $master  主从标记

     * @return void
     */
    protected function triggerSql(string $sql, string $runtime, array $explain = [], bool $master = false): void
    {
        $listen = $this->db->getListen();
        if (!empty($listen)) {
            foreach ($listen as $callback) {
                if (is_callable($callback)) {
                    $callback($sql, $runtime, $explain, $master);
                }
            }
        } else {
            if ($this->config['deploy']) {
                // 分布式记录当前操作的主从
                $master = $master ? 'master|' : 'slave|';
            } else {
                $master = '';
            }

            // 未注册监听则记录到日志中
            $this->log('[ SQL ] ' . $sql . ' [ ' . $master . 'RunTime:' . $runtime . 's ]');

            if (!empty($explain)) {
                $this->log('[ EXPLAIN : ' . var_export($explain, true) . ' ]');
            }
        }
    }

    /**
     * 记录SQL日志
     * @access protected
     * @param string $log  SQL日志信息

     * @param string $type 日志类型

     * @return void
     */
    protected function log($log, $type = 'sql'): void
    {
        if ($this->config['debug']) {
            $this->log->record($log, $type);
        }
    }

    /**
     * 初始化数据库连接
     * @access protected
     * @param boolean $master 是否主服务器

     * @return void
     */
    protected function initConnect(bool $master = true): void
    {
        if (!empty($this->config['deploy'])) {
            // 采用分布式数据库
            if ($master || $this->transTimes) {
                if (!$this->linkWrite) {
                    $this->linkWrite = $this->multiConnect(true);
                }

                $this->linkID = $this->linkWrite;
            } else {
                if (!$this->linkRead) {
                    $this->linkRead = $this->multiConnect(false);
                }

                $this->linkID = $this->linkRead;
            }
        } elseif (!$this->linkID) {
            // 默认单数据库
            $this->linkID = $this->connect();
        }
    }

    /**
     * 连接分布式服务器
     * @access protected
     * @param boolean $master 主服务器

     * @return PDO
     */
    protected function multiConnect(bool $master = false): PDO
    {
        $config = [];

        // 分布式数据库配置解析
        foreach (['username', 'password', 'hostname', 'hostport', 'database', 'dsn', 'charset'] as $name) {
            $config[$name] = is_string($this->config[$name]) ? explode(',', $this->config[$name]) : $this->config[$name];
        }

        // 主服务器序号
        $m = floor(mt_rand(0, $this->config['master_num'] - 1));

        if ($this->config['rw_separate']) {
            // 主从式采用读写分离
            if ($master) // 主服务器写入

            {
                $r = $m;
            } elseif (is_numeric($this->config['slave_no'])) {
                // 指定服务器读
                $r = $this->config['slave_no'];
            } else {
                // 读操作连接从服务器 每次随机连接的数据库
                $r = floor(mt_rand($this->config['master_num'], count($config['hostname']) - 1));
            }
        } else {
            // 读写操作不区分服务器 每次随机连接的数据库
            $r = floor(mt_rand(0, count($config['hostname']) - 1));
        }
        $dbMaster = false;

        if ($m != $r) {
            $dbMaster = [];
            foreach (['username', 'password', 'hostname', 'hostport', 'database', 'dsn', 'charset'] as $name) {
                $dbMaster[$name] = $config[$name][$m] ?? $config[$name][0];
            }
        }

        $dbConfig = [];

        foreach (['username', 'password', 'hostname', 'hostport', 'database', 'dsn', 'charset'] as $name) {
            $dbConfig[$name] = $config[$name][$r] ?? $config[$name][0];
        }

        return $this->connect($dbConfig, $r, $r == $m ? false : $dbMaster);
    }

    /**
     * 析构方法
     * @access public
     */
    public function __destruct()
    {
        // 释放查询
        $this->free();

        // 关闭连接
        $this->close();
    }

    /**
     * 缓存数据
     * @access protected
     * @param CacheItem $cacheItem 缓存Item

     */

    protected function cacheData(CacheItem $cacheItem): void
    {
        if ($cacheItem->getTag()) {
            $this->cache->tag($cacheItem->getTag());
        }

        $this->cache->set($cacheItem->getKey(), $cacheItem->get(), $cacheItem->getExpire());
    }

    /**
     * 获取缓存数据
     * @access protected
     * @param CacheItem $cacheItem

     * @return mixed
     */
    protected function getCacheData(CacheItem $cacheItem)
    {
        // 判断查询缓存
        return $this->cache->get($cacheItem->getKey());
    }

    protected function parseCache(Query $query, array $cache): CacheItem

    {
        list($key, $expire, $tag) = $cache;

        if ($key instanceof CacheItem) {
            $cacheItem = $key;
        } else {
            if (true === $key) {
                if (!empty($query->getOptions('key'))) {
                    $key = 'think:' . $this->getConfig('database') . '.' . $query->getTable() . '|' . $query->getOptions('key');
                } else {
                    $key = md5($this->getConfig('database') . serialize($query->getOptions()) . serialize($query->getBind(false)));
                }
            }

            $cacheItem = new CacheItem($key);
            $cacheItem->expire($expire);
            $cacheItem->tag($tag);
        }

        return $cacheItem;
    }

    /**
     * 延时更新检查 返回false表示需要延时
     * 否则返回实际写入的数值
     * @access public
     * @param string  $type     自增或者自减

     * @param string  $guid     写入标识

     * @param float   $step     写入步进值

     * @param integer $lazyTime 延时时间(s)

     * @return false|integer
     */
    public function lazyWrite(string $type, string $guid, float $step, int $lazyTime)
    {
        if (!$this->cache->has($guid . '_time')) {
            // 计时开始
            $this->cache->set($guid . '_time', time(), 0);
            $this->cache->$type($guid, $step);
        } elseif (time() > $this->cache->get($guid . '_time') + $lazyTime) {
            // 删除缓存
            $value = $this->cache->$type($guid, $step);
            $this->cache->delete($guid);
            $this->cache->delete($guid . '_time');
            return 0 === $value ? false : $value;
        } else {
            // 更新缓存
            $this->cache->$type($guid, $step);
        }

        return false;
    }
}

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Push — 6.0 ( 7fd508...a1342f )

Connection::connect() B

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