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Top Forums Shell Programming and Scripting Monitoring processes in parallel and process log file after process exits Post 303003341 by shunya on Tuesday 12th of September 2017 04:00:38 PM
Old 09-12-2017
That is wonderful, Corona!! It works for me. Thanks for your help.
 

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DBIx::Class::Storage::DBI::MSSQL(3)			User Contributed Perl Documentation		       DBIx::Class::Storage::DBI::MSSQL(3)

NAME
DBIx::Class::Storage::DBI::MSSQL - Base Class for Microsoft SQL Server support in DBIx::Class SYNOPSIS
This is the base class for Microsoft SQL Server support, used by DBIx::Class::Storage::DBI::ODBC::Microsoft_SQL_Server and DBIx::Class::Storage::DBI::Sybase::Microsoft_SQL_Server. IMPLEMENTATION NOTES
IDENTITY information Microsoft SQL Server supports three methods of retrieving the IDENTITY value for inserted row: IDENT_CURRENT, @@IDENTITY, and SCOPE_IDENTITY(). SCOPE_IDENTITY is used here because it is the safest. However, it must be called is the same execute statement, not just the same connection. So, this implementation appends a SELECT SCOPE_IDENTITY() statement onto each INSERT to accommodate that requirement. "SELECT @@IDENTITY" can also be used by issuing: $self->_identity_method('@@identity'); it will only be used if SCOPE_IDENTITY() fails. This is more dangerous, as inserting into a table with an on insert trigger that inserts into another table with an identity will give erroneous results on recent versions of SQL Server. identity insert Be aware that we have tried to make things as simple as possible for our users. For MSSQL that means that when a user tries to create a row, while supplying an explicit value for an autoincrementing column, we will try to issue the appropriate database call to make this possible, namely "SET IDENTITY_INSERT $table_name ON". Unfortunately this operation in MSSQL requires the "db_ddladmin" privilege, which is normally not included in the standard write-permissions. Ordered Subselects If you attempted the following query (among many others) in Microsoft SQL Server $rs->search ({}, { prefetch => 'relation', rows => 2, offset => 3, }); You may be surprised to receive an exception. The reason for this is a quirk in the MSSQL engine itself, and sadly doesn't have a sensible workaround due to the way DBIC is built. DBIC can do truly wonderful things with the aid of subselects, and does so automatically when necessary. The list of situations when a subselect is necessary is long and still changes often, so it can not be exhaustively enumerated here. The general rule of thumb is a joined has_many relationship with limit/group applied to the left part of the join. In its "pursuit of standards" Microsft SQL Server goes to great lengths to forbid the use of ordered subselects. This breaks a very useful group of searches like "Give me things number 4 to 6 (ordered by name), and prefetch all their relations, no matter how many". While there is a hack which fools the syntax checker, the optimizer may still elect to break the subselect. Testing has determined that while such breakage does occur (the test suite contains an explicit test which demonstrates the problem), it is relative rare. The benefits of ordered subselects are on the other hand too great to be outright disabled for MSSQL. Thus compromise between usability and perfection is the MSSQL-specific resultset attribute "unsafe_subselect_ok". It is deliberately not possible to set this on the Storage level, as the user should inspect (and preferably regression-test) the return of every such ResultSet individually. The example above would work if written like: $rs->search ({}, { unsafe_subselect_ok => 1, prefetch => 'relation', rows => 2, offset => 3, }); If it is possible to rewrite the search() in a way that will avoid the need for this flag - you are urged to do so. If DBIC internals insist that an ordered subselect is necessary for an operation, and you believe there is a different/better way to get the same result - please file a bugreport. AUTHOR
See "AUTHOR" in DBIx::Class and "CONTRIBUTORS" in DBIx::Class. LICENSE
You may distribute this code under the same terms as Perl itself. perl v5.18.2 2014-01-05 DBIx::Class::Storage::DBI::MSSQL(3)
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