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Initialize optional variable
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@@ -9,10 +9,10 @@ abstract class SqlDb {
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public string $extension; // extension name
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public string $flavor = ''; // different vendor with the same API, e.g. MariaDB; usually stays empty
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public string $server_info; // server version
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public int $affected_rows; // number of affected rows
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public string $info; // see https://php.net/mysql_info
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public int $errno; // last error code
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public string $error; // last error message
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public int $affected_rows = 0; // number of affected rows
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public string $info = ''; // see https://php.net/mysql_info
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public int $errno = 0; // last error code
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public string $error = ''; // last error message
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/** @var Result|bool */ protected $multi; // used for multiquery
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/** Connect to server
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