Update Known Issues
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README.md
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- Local encodings other than UTF-8 are not supported, and SQLSRV_ENC_CHAR only supports ASCII characters with ASCII code of 0 to 127.
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- Local encodings other than UTF-8 are not supported, and SQLSRV_ENC_CHAR only supports ASCII characters with ASCII code of 0 to 127.
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## Known Issues
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## Known Issues
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- User defined data types and SQL_VARIANT.
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- When pooling is enabled in Linux or macOS
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- Binary column binding with emulate prepare ([issue#140](https://github.com/Microsoft/msphpsql/issues/140) )
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- unixODBC <= 2.3.4 (Linux and macOS) might not return proper diagnostics information, such as error messages, warnings and informative messages
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- Linux
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- due to this unixODBC bug, fetch large data (such as xml, binary) as streams as a workaround. See the examples [here](https://github.com/Microsoft/msphpsql/wiki/Features#connection-pooling-in-linux-and-mac)
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- The following features are not supported with connection pooling:
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- PDO is only supported with unixODBC 2.3.1.
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- Unicode connection strings
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- sqlsrv_server_info and sqlsrv_client_info return false
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- In certain scenarios a generic error message maybe returned instead of a specific error when pooling is disabled
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- When retrieving data from columns with a data type of XML, varchar(max), nvarchar(max), or varbinary(max) no data maybe returned or the data maybe truncated depending on the length of the data in the source table.
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## Version number
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## Version number
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Version number of PHP drivers follow the [semantic versioning](http://semver.org/):
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Version number of PHP drivers follow the [semantic versioning](http://semver.org/):
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