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<?php
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/**
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* @copyright (C)2016-2099 Hnaoyun Inc.
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* @author XingMeng
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* @email hnxsh@foxmail.com
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* @date 2017年8月23日
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* 数据库Sqlite驱动 ,写入数据时自动启用事务
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*/
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namespace core\database;
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use core\basic\Config;
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class Sqlite implements Builder
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{
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protected static $sqlite;
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protected $master;
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protected $slave;
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private $begin = false;
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private function __construct()
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{}
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public function __destruct()
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{
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if ($this->begin) { // 存在待提交的事务时自动进行提交
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$this->master->exec('commit;');
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}
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}
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// 获取单一实例,使用单一实例数据库连接类
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public static function getInstance()
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{
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if (! self::$sqlite) {
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self::$sqlite = new self();
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}
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return self::$sqlite;
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}
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// 连接数据库,接受数据库连接参数,返回数据库连接对象
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public function conn($cfg)
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{
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if (extension_loaded('SQLite3')) {
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try {
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$conn = new \SQLite3($cfg);
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$conn->busyTimeout(15 * 1000); // 设置繁忙延迟时间
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} catch (\Exception $e) {
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error("读取数据库文件失败:" . iconv('gbk', 'utf-8', $e->getMessage()));
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}
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} else {
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if (extension_loaded('pdo_sqlite')) {
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error('未检测到您服务器环境的sqlite3数据库扩展,请检查php.ini中是否已经开启该扩展!<br>另外,检测到您服务器支持pdo_sqlite扩展,您也可以修改数据库配置连接驱动为pdo_sqlite试试!');
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} else {
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error('未检测到您服务器环境的sqlite3数据库扩展,请检查php.ini中是否已经开启该扩展!');
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}
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}
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return $conn;
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}
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// 执行SQL语句,接受完整SQL语句,返回结果集对象
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public function query($sql, $type = 'master')
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{
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$time_s = microtime(true);
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if (! $this->master || ! $this->slave) {
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$cfg = ROOT_PATH . Config::get('database.dbname');
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$conn = $this->conn($cfg);
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$this->master = $conn;
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$this->slave = $conn;
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}
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switch ($type) {
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case 'master':
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if (! $this->begin) { // 存在写入时自动开启显式事务,提高写入性能
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$this->master->exec('begin;');
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$this->begin = true;
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}
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$result = $this->master->exec($sql) or $this->error($sql, 'master');
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break;
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case 'slave':
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$result = $this->slave->query($sql) or $this->error($sql, 'slave');
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break;
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}
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return $result;
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}
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// 数据是否存在模型,接受完整SQL语句,返回boolean数据
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public function isExist($sql)
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{
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$result = $this->query($sql, 'slave');
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if ($result->fetchArray()) {
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$result->finalize();
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return true;
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} else {
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return false;
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}
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}
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// 获取记录总量模型,接受数据库表名,返回int数据
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public function rows($table)
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{
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$sql = "SELECT count(*) FROM $table";
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$result = $this->query($sql, 'slave');
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if (! ! $row = $result->fetchArray(2)) {
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$result->finalize();
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return $row[0];
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} else {
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return 0;
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}
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}
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// 读取字段数量模型,接受数据库表名,返回int数据
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public function fields($table)
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{
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$sql = "SELECT * FROM $table LIMIT 1";
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$result = $this->query($sql, 'slave');
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if ($result) {
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return $result->numColumns();
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} else {
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return false;
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}
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}
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/**
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* 获取表字段,接受数据库表名,返回表字段数组
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*
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* @param $table 表名
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*/
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public function tableFields($table)
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{
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$sql = "pragma table_info($table)";
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$result = $this->query($sql, 'slave');
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$rows = array();
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while (! ! $row = $result->fetchArray(SQLITE3_ASSOC)) {
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$rows[] = $row['name'];
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}
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$result->finalize();
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return $rows;
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}
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// 查询一条数据模型,接受完整SQL语句,有数据返回对象数组,否则空数组
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public function one($sql, $type = null)
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{
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if (! $type) {
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$my_type = SQLITE3_ASSOC;
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} else {
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$my_type = $type;
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}
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$row = array();
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$result = $this->query($sql, 'slave');
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if (! ! $row = $result->fetchArray($my_type)) {
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if (! $type && $row) {
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$out = new \stdClass();
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foreach ($row as $key => $value) {
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$out->$key = $value;
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}
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$row = $out;
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}
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$result->finalize();
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}
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return $row;
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}
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// 查询多条数据模型,接受完整SQL语句,有数据返回二维对象数组,否则空数组
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public function all($sql, $type = null)
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{
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if (! $type) {
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$my_type = SQLITE3_ASSOC;
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} else {
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$my_type = $type;
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}
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$result = $this->query($sql, 'slave');
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$rows = array();
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while (! ! $row = $result->fetchArray($my_type)) {
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if (! $type && $row) {
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$out = new \stdClass();
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foreach ($row as $key => $value) {
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$out->$key = $value;
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}
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$row = $out;
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}
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$rows[] = $row;
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}
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$result->finalize();
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return $rows;
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}
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// 数据增、删、改模型,接受完整SQL语句,返回影响的行数的int数据
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public function amd($sql)
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{
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$result = $this->query($sql, 'master');
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if ($result) {
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return $result;
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} else {
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return 0;
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}
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}
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// 最近一次插入数据的自增字段值,返回int数据
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public function insertId()
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{
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return $this->master->lastInsertRowID();
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}
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// 执行多条SQL模型,成功返回true,否则false
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public function multi($sql)
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{
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$sqls = explode(';', $sql);
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foreach ($sqls as $key => $value) {
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$result = $this->query($value, 'master');
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}
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if ($result) {
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return true;
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} else {
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return false;
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}
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}
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// 显示执行错误
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protected function error($sql, $conn)
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{
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$err = '错误:' . $this->$conn->lastErrorMsg();
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if ($this->begin) { // 存在显式开启事务时进行回滚
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$this->master->exec('rollback;');
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$this->begin = false;
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}
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// error('执行SQL发生错误!' . $err . '语句:' . $sql);
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error('执行SQL发生错误!' . $err);
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}
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} |