pdo db 操作类

摘要：操作类查询插入更新删除简单数据库操作类构造防止克隆查询语句查询方式更新表名字段与值条件插入表名字段与值覆盖方式插入表名字段与值删除表名条件执行语句

1.db操作类

getAll("SELECT * FROM live_userinfo_base limit 10");

/**
 * 插入
 */
//$sss = $db->insert("live_user_online", [
//    "userid" => 1111,
//    "name" => "aaaaaaa",
//    "roomid" => 1006,
//    "role"  => 3,
//    "level" => 3,
//    "ltime" => 21312,
//    "regIp" => 23432432
//]);

/**
 * 更新
 */
//$sss = $db->update("live_user_online", [
//    "name" => "aaaaaaasdfsdfsdfaaaaaaaaaaa",
//    "roomid" => 1006,
//    "role"  => 3,
//    "level" => 3,
//    "ltime" => 21312,
//    "regIp" => 23432432
//], "userid = 1111", false);

/**
 * 删除
 */
//$sss = $db->delete("live_user_online", "userid = 1111", false);
//print_r($sss);


/**
 * Db 简单数据库操作类
 */
/**
 * MyPDO
 * @author Jason.Wei 
 * @license http://www.sunbloger.com/
 * @version 5.0 utf8
 */
class Db
{
    protected static $_instance = null;
    protected $dbName = "";
    protected $dsn;
    protected $dbh;

    /**
     * 构造
     *
     * @return MyPDO
     */
    private function __construct($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset)
    {
        try {
            $this->dsn = "mysql:host=".$dbHost.";dbname=".$dbName;
            $this->dbh = new PDO($this->dsn, $dbUser, $dbPasswd);
            $this->dbh->exec("SET character_set_connection=".$dbCharset.", character_set_results=".$dbCharset.", character_set_client=binary");
        } catch (PDOException $e) {
            $this->outputError($e->getMessage());
        }
    }

    /**
     * 防止克隆
     *
     */
    private function __clone() {}

    /**
     * Singleton instance
     *
     * @return Object
     */
    public static function getInstance($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset)
    {
        if (self::$_instance === null) {
            self::$_instance = new self($dbHost, $dbUser, $dbPasswd, $dbName, $dbCharset);
        }
        return self::$_instance;
    }


    public function getOne($strSql, $debug = false)
    {
        return $this->query($strSql, $queryMode = "Row", $debug = false);
    }

    public function getAll($strSql, $debug = false)
    {
        return $this->query($strSql, $queryMode = "All", $debug = false);
    }

    /**
     * Query 查询
     *
     * @param String $strSql SQL语句
     * @param String $queryMode 查询方式(All or Row)
     * @param Boolean $debug
     * @return Array
     */
    private function query($strSql, $queryMode = "All", $debug = false)
    {
        if ($debug === true) $this->debug($strSql);
        $recordset = $this->dbh->query($strSql);
        $this->getPDOError();
        if ($recordset) {
            $recordset->setFetchMode(PDO::FETCH_ASSOC);
            if ($queryMode == "All") {
                $result = $recordset->fetchAll();
            } elseif ($queryMode == "Row") {
                $result = $recordset->fetch();
            }
        } else {
            $result = null;
        }
        return $result;
    }

    /**
     * Update 更新
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param String $where 条件
     * @param Boolean $debug
     * @return Int
     */
    public function update($table, $arrayDataValue, $where = "", $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        if ($where) {
            $strSql = "";
            foreach ($arrayDataValue as $key => $value) {
                $strSql .= ", `$key`="$value"";
            }
            $strSql = substr($strSql, 1);
            $strSql = "UPDATE `$table` SET $strSql WHERE $where";
        } else {
            $strSql = "REPLACE INTO `$table` (`".implode("`,`", array_keys($arrayDataValue))."`) VALUES ("".implode("","", $arrayDataValue)."")";
        }
        if ($debug === true) $this->debug($strSql);
        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * Insert 插入
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param Boolean $debug
     * @return Int
     */
    public function insert($table, $arrayDataValue, $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        $strSql = "INSERT INTO `$table` (`".implode("`,`", array_keys($arrayDataValue))."`) VALUES ("".implode("","", $arrayDataValue)."")";
        if ($debug === true) $this->debug($strSql);
        $result = $this->dbh->exec($strSql);
//        $this->dbh->query($strSql);
        $this->getPDOError();
        return $this->dbh->lastInsertId();
    }

    /**
     * Replace 覆盖方式插入
     *
     * @param String $table 表名
     * @param Array $arrayDataValue 字段与值
     * @param Boolean $debug
     * @return Int
     */
    public function replace($table, $arrayDataValue, $debug = false)
    {
        $this->checkFields($table, $arrayDataValue);
        $strSql = "REPLACE INTO `$table`(`".implode("`,`", array_keys($arrayDataValue))."`) VALUES ("".implode("","", $arrayDataValue)."")";
        if ($debug === true) $this->debug($strSql);
        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * Delete 删除
     *
     * @param String $table 表名
     * @param String $where 条件
     * @param Boolean $debug
     * @return Int
     */
    public function delete($table, $where = "", $debug = false)
    {
        if ($where == "") {
            $this->outputError(""WHERE" is Null");
        } else {
            $strSql = "DELETE FROM `$table` WHERE $where";
            if ($debug === true) $this->debug($strSql);
            $result = $this->dbh->exec($strSql);
            $this->getPDOError();
            return $result;
        }
    }

    /**
     * execSql 执行SQL语句
     *
     * @param String $strSql
     * @param Boolean $debug
     * @return Int
     */
    public function execSql($strSql, $debug = false)
    {
        if ($debug === true) $this->debug($strSql);
        $result = $this->dbh->exec($strSql);
        $this->getPDOError();
        return $result;
    }

    /**
     * 获取字段最大值
     *
     * @param string $table 表名
     * @param string $field_name 字段名
     * @param string $where 条件
     */
    public function getMaxValue($table, $field_name, $where = "", $debug = false)
    {
        $strSql = "SELECT MAX(".$field_name.") AS MAX_VALUE FROM $table";
        if ($where != "") $strSql .= " WHERE $where";
        if ($debug === true) $this->debug($strSql);
        $arrTemp = $this->query($strSql, "Row");
        $maxValue = $arrTemp["MAX_VALUE"];
        if ($maxValue == "" || $maxValue == null) {
            $maxValue = 0;
        }
        return $maxValue;
    }

    /**
     * 获取指定列的数量
     *
     * @param string $table
     * @param string $field_name
     * @param string $where
     * @param bool $debug
     * @return int
     */
    public function getCount($table, $field_name, $where = "", $debug = false)
    {
        $strSql = "SELECT COUNT($field_name) AS NUM FROM $table";
        if ($where != "") $strSql .= " WHERE $where";
        if ($debug === true) $this->debug($strSql);
        $arrTemp = $this->query($strSql, "Row");
        return $arrTemp["NUM"];
    }

    /**
     * 获取表引擎
     *
     * @param String $dbName 库名
     * @param String $tableName 表名
     * @param Boolean $debug
     * @return String
     */
    public function getTableEngine($dbName, $tableName)
    {
        $strSql = "SHOW TABLE STATUS FROM $dbName WHERE Name="".$tableName.""";
        $arrayTableInfo = $this->query($strSql);
        $this->getPDOError();
        return $arrayTableInfo[0]["Engine"];
    }

    /**
     * beginTransaction 事务开始
     */
    private function beginTransaction()
    {
        $this->dbh->beginTransaction();
    }

    /**
     * commit 事务提交
     */
    private function commit()
    {
        $this->dbh->commit();
    }

    /**
     * rollback 事务回滚
     */
    private function rollback()
    {
        $this->dbh->rollback();
    }

    /**
     * transaction 通过事务处理多条SQL语句
     * 调用前需通过getTableEngine判断表引擎是否支持事务
     *
     * @param array $arraySql
     * @return Boolean
     */
    public function execTransaction($arraySql)
    {
        $retval = 1;
        $this->beginTransaction();
        foreach ($arraySql as $strSql) {
            if ($this->execSql($strSql) == 0) $retval = 0;
        }
        if ($retval == 0) {
            $this->rollback();
            return false;
        } else {
            $this->commit();
            return true;
        }
    }

    public function quote($sqlVal)
    {
        return $this->dbh->quote($sqlVal);
    }

    /**
     * checkFields 检查指定字段是否在指定数据表中存在
     *
     * @param String $table
     * @param array $arrayField
     */
    private function checkFields($table, $arrayFields)
    {
        $fields = $this->getFields($table);
        foreach ($arrayFields as $key => $value) {
            if (!in_array($key, $fields)) {
                $this->outputError("Unknown column `$key` in field list.");
            }
        }
    }

    /**
     * getFields 获取指定数据表中的全部字段名
     *
     * @param String $table 表名
     * @return array
     */
    private function getFields($table)
    {
        $fields = array();
        $recordset = $this->dbh->query("SHOW COLUMNS FROM $table");
        $this->getPDOError();
        $recordset->setFetchMode(PDO::FETCH_ASSOC);
        $result = $recordset->fetchAll();
        foreach ($result as $rows) {
            $fields[] = $rows["Field"];
        }
        return $fields;
    }

    /**
     * getPDOError 捕获PDO错误信息
     */
    private function getPDOError()
    {
        if ($this->dbh->errorCode() != "00000") {
            $arrayError = $this->dbh->errorInfo();
            $this->outputError($arrayError[2]);
        }
    }

    /**
     * debug
     *
     * @param mixed $debuginfo
     */
    private function debug($debuginfo)
    {
        var_dump($debuginfo);
        exit();
    }

    /**
     * 输出错误信息
     *
     * @param String $strErrMsg
     */
    private function outputError($strErrMsg)
    {
        throw new Exception("MySQL Error: ".$strErrMsg);
    }

    /**
     * destruct 关闭数据库连接
     */
    public function destruct()
    {
        $this->dbh = null;
    }


    /**
     * 析构函数
     */
    public function __destruct()
    {
        $this->destruct();
    }
}