Fatal error: Undefined class constant 'PDO::SQLSRV_ATTR_ENCODING' in /usr/home/qxu1146530146/htdocs/ThinkPHP/Library/Think/Db.class.php on line 44 系统发生错误

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Undefined class constant 'PDO::SQLSRV_ATTR_ENCODING'

错误位置

FILE: /usr/home/qxu1146530146/htdocs/ThinkPHP/Library/Think/Db.class.php 　LINE: 44

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