<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace think\db\connector;
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use PDO;
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use think\db\Connection;
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use think\Log;
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/**
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* mysql数据库驱动
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*/
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class Mysql extends Connection
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{
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protected $builder = '\\think\\db\\builder\\Mysql';
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/**
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* 解析pdo连接的dsn信息
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* @access protected
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* @param array $config 连接信息
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* @return string
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*/
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protected function parseDsn($config)
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{
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if (!empty($config['socket'])) {
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$dsn = 'mysql:unix_socket=' . $config['socket'];
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} elseif (!empty($config['hostport'])) {
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$dsn = 'mysql:host=' . $config['hostname'] . ';port=' . $config['hostport'];
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} else {
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$dsn = 'mysql:host=' . $config['hostname'];
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}
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$dsn .= ';dbname=' . $config['database'];
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if (!empty($config['charset'])) {
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$dsn .= ';charset=' . $config['charset'];
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}
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return $dsn;
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}
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/**
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* 取得数据表的字段信息
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* @access public
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* @param string $tableName
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* @return array
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*/
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public function getFields($tableName)
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{
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list($tableName) = explode(' ', $tableName);
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if (false === strpos($tableName, '`')) {
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if (strpos($tableName, '.')) {
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$tableName = str_replace('.', '`.`', $tableName);
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}
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$tableName = '`' . $tableName . '`';
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}
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$sql = 'SHOW COLUMNS FROM ' . $tableName;
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$pdo = $this->query($sql, [], false, true);
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$result = $pdo->fetchAll(PDO::FETCH_ASSOC);
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$info = [];
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if ($result) {
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foreach ($result as $key => $val) {
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$val = array_change_key_case($val);
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$info[$val['field']] = [
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'name' => $val['field'],
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'type' => $val['type'],
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'notnull' => (bool) ('' === $val['null']), // not null is empty, null is yes
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'default' => $val['default'],
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'primary' => (strtolower($val['key']) == 'pri'),
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'autoinc' => (strtolower($val['extra']) == 'auto_increment'),
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];
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}
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}
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return $this->fieldCase($info);
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}
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/**
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* 取得数据库的表信息
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* @access public
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* @param string $dbName
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* @return array
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*/
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public function getTables($dbName = '')
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{
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$sql = !empty($dbName) ? 'SHOW TABLES FROM ' . $dbName : 'SHOW TABLES ';
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$pdo = $this->query($sql, [], false, true);
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$result = $pdo->fetchAll(PDO::FETCH_ASSOC);
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$info = [];
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foreach ($result as $key => $val) {
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$info[$key] = current($val);
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}
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return $info;
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}
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/**
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* SQL性能分析
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* @access protected
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* @param string $sql
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* @return array
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*/
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protected function getExplain($sql)
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{
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$pdo = $this->linkID->query("EXPLAIN " . $sql);
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$result = $pdo->fetch(PDO::FETCH_ASSOC);
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$result = array_change_key_case($result);
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if (isset($result['extra'])) {
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if (strpos($result['extra'], 'filesort') || strpos($result['extra'], 'temporary')) {
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Log::record('SQL:' . $this->queryStr . '[' . $result['extra'] . ']', 'warn');
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}
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}
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return $result;
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}
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protected function supportSavepoint()
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{
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return true;
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}
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}
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