Download Provider

Generally, a download manager enables downloading of large files or multiples files in one session. Many web browsers, such as Internet Explorer 9, include a download manager. Stand-alone download managers also are available, including the Microsoft Download Manager. If you do not have a download manager installed, and still want to download the file(s) you've chosen, please note:.

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You may not be able to download multiple files at the same time. In this case, you will have to download the files individually. (You would have the opportunity to download individual files on the 'Thank you for downloading' page after completing your download.). Files larger than 1 GB may take much longer to download and might not download correctly. You might not be able to pause the active downloads or resume downloads that have failed. The Microsoft Download Manager solves these potential problems.

It gives you the ability to download multiple files at one time and download large files quickly and reliably. It also allows you to suspend active downloads and resume downloads that have failed. Microsoft Download Manager is free and available for download now. This download will install a set of components that facilitate the transfer of data between existing Microsoft Office files such as Microsoft Office Access 2010 (.mdb and.accdb) files and Microsoft Office Excel 2010 (.xls,.xlsx, and.xlsb) files to other data sources such as Microsoft SQL Server. Connectivity to existing text files is also supported. ODBC and OLEDB drivers are installed for application developers to use in developing their applications with connectivity to Office file formats. The Access Database Engine 2010 Redistributable is not intended:.

Oracle Technology Network Database Windows. Database Downloads Database In-Memory Multitenant More Key Features Application Development. The CCM_Download_Provider class, in Configuration Manager, defines and registers a non-Microsoft download plug-in provider. The name of the non-Microsoft provider. This field must match the value specified to the SMS provider.

As a general replacement for Jet (If you need a general replacement for Jet you should use ). As a replacement for the Jet OLEDB Provider in server-side applications. As a general word processing, spreadsheet or database management system -To be used as a way to create files. (You can use Microsoft Office or Office automation to create the files that Microsoft Office supports.). To be used by a system service or server-side program where the code will run under a system account, or will deal with multiple users identities concurrently, or is highly reentrant and expects stateless behavior.

Examples would include a program that is run from task scheduler when no user is logged in, or a program called from server-side web application such as ASP.NET, or a distributed component running under COM+ services. The Office System Drivers are only supported under certain scenarios, including:. Desktop applications which read from and write to various files formats including Microsoft Office Access, Microsoft Office Excel and text files. To transfer data between supported file formats and a database repository, such as SQL Server. For example, to transfer data from an Excel workbook into SQL Server using the SQL Server Import and Export Wizard or SQL Server Integration Services (provided the SSIS jobs run in the context of a logged-on user with a valid HKEYCURRENTUSER registry hive).

Advanced topic! Plugin development is a highly advancedtopic in Terraform, and is not required knowledge for day-to-day usage.If you don't plan on writing any plugins, this section of the documentation is not necessary to read. For general use of Terraform, please see ourIntro to Terraform and GettingStarted guides.

A provider in Terraform is responsible for the lifecycle of a resource:create, read, update, delete. An example of a provider is AWS, whichcan manage resources of type aws_instance, aws_eip, aws_elb, etc.

The primary reasons to care about provider plugins are:

  • You want to add a new resource type to an existing provider.

  • You want to write a completely new provider for managing resourcetypes in a system not yet supported.

  • You want to write a completely new provider for custom, internalsystems such as a private inventory management system.

If you're interested in provider development, then read on. The remainderof this page will assume you're familiar withplugin basics and that you already havea basic development environment setup.

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» Provider Plugin Codebases

Provider plugins live outside of the Terraform core codebase in their ownsource code repositories. The official set of provider plugins released byHashiCorp (developed by both HashiCorp staff and community contributors)all live in repositories inthe terraform-providers organizationon GitHub, but third-party plugins can be maintained in any source coderepository.

When developing a provider plugin, it is recommended to use a common GOPATHthat includes both the core Terraform repository and the repositories of anyproviders being changed. This makes it easier to use a locally-builtterraform executable and a set of locally-built provider plugins togetherwithout further configuration.

For example, to download both Terraform and the template provider intoGOPATH:

These two packages are both 'main' packages that can be built into separateexecutables with go install:

After running the above commands, both Terraform core and the templateprovider will both be installed in the current GOPATH and $GOPATH/binwill contain both terraform and terraform-provider-template executables.This terraform executable will find and use the template provider pluginalongside it in the bin directory in preference to downloading and installingan official release.

When constructing a new provider from scratch, it's recommended to followa similar repository structure as for the existing providers, with the mainpackage in the repository root and a library package in a subdirectory namedafter the provider. For more information, seeWriting Custom Providers in theExtending Terraform section.

When making changes only to files within the provider repository, it is notnecessary to re-build the main Terraform executable. Note that some packagesfrom the Terraform repository are used as library dependencies by providers,such as; it is recommended touse govendor to create a local vendor copy of the relevant packages in theprovider repository, as can be seen in the repositories within theterraform-providers GitHub organization.

» Low-Level Interface

The interface you must implement for providers isResourceProvider.

This interface is extremely low level, however, and we don't recommendyou implement it directly. Implementing the interface directly is errorprone, complicated, and difficult.

Instead, we've developed some higher level libraries to help you outwith developing providers. These are the same libraries we use in ourown core providers.

» helper/schema

The helper/schema library is a framework we've built to make creatingproviders extremely easy. This is the same library we use to build mostof the core providers.

To give you an idea of how productive you can become with this framework:we implemented the Google Cloud provider in about 6 hours of coding work.This isn't a simple provider, and we did have knowledge ofthe framework beforehand, but it goes to show how expressive the frameworkcan be.

The GoDoc for helper/schema can befound here.This is API-level documentation but will be extremely importantfor you going forward.

» Provider

The first thing to do in your plugin is to create theschema.Provider structure.This structure implements the ResourceProvider interface. Werecommend creating this structure in a function to make testing easierlater. Example:

Within the schema.Provider, you should initialize all the fields. Theyare documented within the godoc, but a brief overview is here as well:

Download provider
  • Schema - This is the configuration schema for the provider itself. You should define any API keys, etc. here. Schemas are covered below.

  • ResourcesMap - The map of resources that this provider supports. All keys are resource names and the values are the schema.Resource structures implementing this resource.

  • ConfigureFunc - This function callback is used to configure the provider. This function should do things such as initialize any API clients, validate API keys, etc. The interface{} return value of this function is the meta parameter that will be passed into all resource CRUD functions. In general, the returned value is a configuration structure or a client.

As part of the unit tests, you should call InternalValidate. This is usedto verify the structure of the provider and all of the resources, and reportsan error if it is invalid. An example test is shown below:

Having this unit test will catch a lot of beginner mistakes as you buildyour provider.

» Resources

Next, you'll want to create the resources that the provider can manage.These resources are put into the ResourcesMap field of the providerstructure. Again, we recommend creating functions to instantiate these.An example is shown below.

Resources are described using theschema.Resourcestructure. This structure has the following fields:

  • Schema - The configuration schema for this resource. Schemas are covered in more detail below.

  • Create, Read, Update, and Delete - These are the callback functions that implement CRUD operations for the resource. The only optional field is Update. If your resource doesn't support update, then you may keep that field nil.

  • Importer - If this is non-nil, then this resource isimportable. It is recommended toimplement this.

The CRUD operations in more detail, along with their contracts:

  • Create - This is called to create a new instance of the resource. Terraform guarantees that an existing ID is not set on the resource data. That is, you're working with a new resource. Therefore, you are responsible for calling SetId on your schema.ResourceData using a value suitable for your resource. This ensures whatever resource state you set on schema.ResourceData will be persisted in local state. If you neglect to SetId, no resource state will be persisted.

  • Read - This is called to resync the local state with the remote state. Terraform guarantees that an existing ID will be set. This ID should be used to look up the resource. Any remote data should be updated into the local data. No changes to the remote resource are to be made. If the resource is no longer present, calling SetId with an empty string will signal its removal.

  • Update - This is called to update properties of an existing resource. Terraform guarantees that an existing ID will be set. Additionally, the only changed attributes are guaranteed to be those that support update, as specified by the schema. Be careful to read about partial states below.

  • Delete - This is called to delete the resource. Terraform guarantees an existing ID will be set.

  • Exists - This is called to verify a resource still exists. It is called prior to Read, and lowers the burden of Read to be able to assume the resource exists. false should be returned if the resources is no longer present, which has the same effect as calling SetId(') from Read (i.e. removal of the resource data from state).

» Schemas

Both providers and resources require a schema to be specified. The schemais used to define the structure of the configuration, the types, etc. It isvery important to get correct.

In both provider and resource, the schema is a map[string]*schema.Schema.The key of this map is the configuration key, and the value is a schema forthe value of that key.

Schemas are incredibly powerful, so this documentation page won't attemptto cover the full power of them. Instead, the API docs should be referencedwhich cover all available settings.

We recommend viewing schemas of existing or similar providers to learnbest practices. A good starting place is thecore Terraform providers.

» Resource Data

The parameter to provider configuration as well as all the CRUD operationson a resource is aschema.ResourceData.This structure is used to query configurations as well as to set informationabout the resource such as its ID, connection information, and computedattributes.

The API documentation covers ResourceData well, as well as the core providersin Terraform.

Partial state deserves a special mention. Occasionally in Terraform, create orupdate operations are not atomic; they can fail halfway through. As an example,when creating an AWS security group, creating the group may succeed,but creating all the initial rules may fail. In this case, it is incrediblyimportant that Terraform record the correct partial state so that asubsequent terraform apply fixes this resource.

Most of the time, partial state is not required. When it is, it must bespecifically enabled. An example is shown below:

In the example above, it is possible that setting the tags succeeds,but setting the name fails. In this scenario, we want to make surethat only the state of the tags is updated. To do this thePartial and SetPartial functions are used.

Partial toggles partial-state mode. When disabled, all changes are mergedinto the state upon result of the operation. When enabled, only changesenabled with SetPartial are merged in.

SetPartial tells Terraform what state changes to adopt upon completionof an operation. You should call SetPartial with every key that is safeto merge into the state. The parameter to SetPartial is a prefix, soif you have a nested structure and want to accept the whole thing,you can just specify the prefix.