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.IX Title "DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server 3pm"
.TH DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server 3pm "2018-04-19" "perl v5.26.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server \- Support for Microsoft
SQL Server via DBD::ADO
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
This subclass supports \s-1MSSQL\s0 server connections via \s-1DBD::ADO\s0.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \s-1MSSQL\s0 specific functionality is provided by
DBIx::Class::Storage::DBI::MSSQL.
.SH "EXAMPLE DSN"
.IX Header "EXAMPLE DSN"
.Vb 1
\&  dbi:ADO:provider=sqlncli10;server=EEEBOX\eSQLEXPRESS
.Ve
.SH "CAVEATS"
.IX Header "CAVEATS"
.SS "identities"
.IX Subsection "identities"
\&\f(CW\*(C`_identity_method\*(C'\fR is set to \f(CW@@identity\fR, as \f(CW\*(C`SCOPE_IDENTITY()\*(C'\fR doesn't work
with \s-1DBD::ADO\s0. See \*(L"\s-1IMPLEMENTATION NOTES\*(R"\s0 in DBIx::Class::Storage::DBI::MSSQL
for caveats regarding this.
.SS "truncation bug"
.IX Subsection "truncation bug"
There is a bug with \s-1MSSQL ADO\s0 providers where data gets truncated based on the
size of the bind sizes in the first prepare call:
.PP
<https://rt.cpan.org/Ticket/Display.html?id=52048>
.PP
The \f(CW\*(C`ado_size\*(C'\fR workaround is used (see \*(L"\s-1ADO\s0 providers\*(R" in \s-1DBD::ADO\s0) with the
approximate maximum size of the data_type of the bound column, or 8000 (maximum
\&\s-1VARCHAR\s0 size) if the data_type is not available.
.PP
Please report problems with this driver and send patches.
.SS "LongReadLen"
.IX Subsection "LongReadLen"
\&\f(CW\*(C`LongReadLen\*(C'\fR is set to \f(CW\*(C`LongReadLen * 2 + 1\*(C'\fR on connection as it is necessary
for some \s-1LOB\s0 types. Be aware of this if you localize this value on the \f(CW$dbh\fR
directly.
.SS "binary data"
.IX Subsection "binary data"
Due perhaps to the ado_size workaround we use, and/or other reasons, binary data
such as \f(CW\*(C`varbinary\*(C'\fR column data comes back padded with trailing \f(CW\*(C`NULL\*(C'\fR chars.
The Cursor class for this driver
(DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server::Cursor) removes them,
of course if your binary data is actually \f(CW\*(C`NULL\*(C'\fR padded that may be an issue to
keep in mind when using this driver.
.SS "uniqueidentifier columns"
.IX Subsection "uniqueidentifier columns"
uniqueidentifier columns come back from \s-1ADO\s0 wrapped in braces and must be
submitted to the \s-1MSSQL ADO\s0 driver wrapped in braces. We take care of this
transparently in this driver and the associated Cursor class
(DBIx::Class::Storage::DBI::ADO::Microsoft_SQL_Server::Cursor) so that you
don't have to use braces in most cases (except in literal \s-1SQL,\s0 in those cases
you will have to add the braces yourself.)
.SS "fractional seconds"
.IX Subsection "fractional seconds"
Fractional seconds with DBIx::Class::InflateColumn::DateTime are not
currently supported, datetimes are truncated at the second.
.SH "FURTHER QUESTIONS?"
.IX Header "FURTHER QUESTIONS?"
Check the list of additional \s-1DBIC\s0 resources.
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This module is free software copyright
by the DBIx::Class (\s-1DBIC\s0) authors. You can
redistribute it and/or modify it under the same terms as the
DBIx::Class library.