SQL Management Objects, or SMO, provides objects and APIs to discover, modify, and script out SQL Server entities.
See https://docs.microsoft.com/sql/relational-databases/server-management-objects-smo/overview-smo
SMO packages on nuget.org include:
This package is the primary development SDK for SMO. It provides both NetFx and NetStandard binaries. Capabilities of the NetStandard binaries may be limited by that platform, such as the lack of WMI support. Version suffixes for this package include "preview" and "msdata". The preview suffix indicates the package was built using System.Data and System.Data.SqlClient as its SQL client driver for NetFx. The msdata suffix indicate the package uses Microsoft.Data.SqlClient as its SQL client driver for NetFx. The binaries are strong named and Authenticode signed.
This package has resource DLLs with localized strings corresponding to the DLLs in Microsoft.SqlServer.SqlManagementObjects.
This package has NetFx binaries that continue to use System.Data.SqlClient as their SQL client driver. It is mainly intended for use by Sql Server Management Studio and Sql Server Data Tools until such time as those tools can upgrade to Microsoft.Data.SqlClient. If you are building SSMS 18 extensions that depend on SMO, use this package instead of Microsoft.SqlServer.SqlManagementObjects.
SmoMetadataProvider provides completion support for TSQL language services in Azure Data Studio and the Sql Server extension for VS Code.
SmoMetadataProvider.SSMS provides completion support for the TSQL language service in Sql Server Management Studio.
The major version for each SMO release corresponds with the highest Sql Server compatibility level that version of SMO supports. For example, 140 means it supports SQL Server 2017 and below. Some features of SMO may require having a matching SQL Server version in order to work effectively, but most features are fully backward compatible.
SMO is a integral part of the SQL Server ecosystem. A broad set of client tools, engine components, and service components rely on it extensively. The set of SMO dependents includes:
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