23.01.2020»»четверг

Microsoft Sql Server Cannot Connect

23.01.2020
  1. Microsoft Sql Server Cannot Connect Remote
  2. Microsoft Sql Server Cannot Connect To Database
  3. Can't Connect To Sql Server

Connecting to SQL Server (AccessToSQL); 5 minutes to read +3; In this article. To migrate Access databases to SQL Server, you must connect to the target instance of SQL Server. When you connect, SSMA obtains metadata about the databases in the instance of SQL Server and displays database metadata in SQL Server Metadata Explorer. When the SQL Server driver on a client uses integrated security to connect to SQL Server, the driver code on the client tries to resolve the fully qualified DNS of the computer that is running SQL Server by using the WinSock networking APIs.

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To migrate Access databases to SQL Server, you must connect to the target instance of SQL Server. When you connect, SSMA obtains metadata about the databases in the instance of SQL Server and displays database metadata in SQL Server Metadata Explorer. SSMA stores information about which instance of SQL Server that you are connected to, but does not store passwords.

Your connection to SQL Server stays active until you close the project. When you reopen the project, you must reconnect to SQL Server if you want an active connection to the server. You can work offline until you load database objects into SQL Server and migrate data.

Metadata about the instance of SQL Server is not automatically synchronized. Instead, to update the metadata in SQL Server Metadata Explorer, you must manually update the SQL Server metadata. For more information, see the 'Synchronizing SQL Server Metadata' section later in this topic.

Required SQL Server Permissions

The account that is used to connect to SQL Server requires different permissions depending on the actions that are performed by that account.

  • To convert Access objects to Transact-SQL syntax, to refresh metadata from SQL Server, or to save converted syntax to scripts, the account must have permission to log in to the instance of SQL Server.

  • To load database objects into SQL Server and to migrate data to SQL Server, the minimum permission requirement is membership in the db_owner database role in the target database.

Establishing a SQL Server Connection

Before you convert Access database objects to SQL Server syntax, you must establish a connection to the instance of SQL Server where you want to migrate the Access databases.

When you define the connection properties, you also specify the database where objects and data will be migrated. You can customize this mapping at the Access database level after you connect to SQL Server. For more information, see Mapping Source and Target Databases.

Important

Before you connect to SQL Server, make sure that the instance of SQL Server is running and can accept connections. For more information, see 'Connecting to the SQL Server Database Engine' in SQL Server Books Online.

To connect to SQL Server

  1. On the File menu, select Connect to SQL Server.

    If you previously connected to SQL Server, the command name will be Reconnect to SQL Server.

  2. In the Server name box, enter or select the name of the instance of SQL Server.

    • If you are connecting to the default instance on the local computer, you can enter localhost or a dot (.).

    • If you are connecting to the default instance on another computer, enter the name of the computer.

    • If you are connecting to a named instance, enter the computer name, a backslash, and the instance name. For example: MyServerMyInstance.

    • To connect to an active user instance of SQL Server Express, connect by using named pipes protocol and specifying the pipe name, such as .pipesqlquery. For more information, see the SQL Server Express documentation.

  3. If your instance of SQL Server is configured to accept connections on a non-default port, enter the port number that is used for SQL Server connections in the Server port box. For the default instance of SQL Server, the default port number is 1433. For named instances, SSMA will try to obtain the port number from the SQL Server Browser Service.

  4. In the Database box, enter the name of the target database for object and data migration.

    This option is not available when reconnecting to SQL Server.

    The target database name cannot contain spaces or special characters. For example, you can migrate Access databases to a SQL Server database named 'abc'. But you cannot migrate Access databases to a SQL Server database named 'a b-c'.

    You can customize this mapping per database after you connect. For more information, see Mapping Source and Target Databases

  5. In the Authentication drop-down menu, select the authentication type to use for the connection. To use the current Windows account, select Windows Authentication. To use a SQL Server login, select SQL Server Authentication, and then provide a user name and password.

  6. For Secure connection, two controls are added, Encrypt Connection Checkbox and TrustServerCertificate Checkbox. Only when Encrypt Connection Checkbox is checked TrustServerCertificate Checkbox is visible. When Encrypt Connection is checked(true) and TrustServerCertificate is unchecked(false), will validate the SQL Server SSL certificate. Validating the server certificate is a part of the SSL handshake and ensures that the server is the correct server to connect to. To ensure this, a certificate must be installed on the client side as well as on the server side.

  7. Click Connect.

Higher version compatibility

It is allowed to connect/reconnect to higher versions of SQL Server.

  1. You will be able to connect to SQL Server 2008 or SQL Server 2012 when the project created is SQL Server 2005.

  2. You will be able to connect to SQL Server 2012 when the project created is SQL Server 2008 but it is not allowed to connect to lower versions i.e. SQL Server 2005.

  3. You will be able to connect to only SQL Server 2012 when the project created is SQL Server 2012.

  4. Higher version compatibility is not valid for SQL Azure.

PROJECT TYPE Vs TARGET SERVER VERSIONSQL Server 2005 (Version: 9.x)SQL Server 2008 (Version: 10.x)SQL Server 2012 (Version:11.x)SQL Server 2014 (Version:12.x)SQL Server 2016 (Version:13.x)SQL Azure
SQL Server 2005YesYesYesYesYes
SQL Server 2008YesYesYesYes
SQL Server 2012YesYesYes
SQL Server 2014YesYes
SQL Server 2016Yes
SQL AzureYes

Important

Conversion of the database objects is carried out as per the project type but not as per the version of the SQL Server connected to. In case of SQL Server 2005 project, Conversion is carried out as per SQL Server 2005 even though you are connected to a higher version of SQL Server (SQL Server 2008/SQL Server 2012/SQL Server 2014/SQL Server 2016).

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Synchronizing SQL Server Metadata

If SQL Server schemas change after you connect, you can synchronize the metadata with the server.

To synchronize SQL Server metadata

  • In SQL Server Metadata Explorer, right click Databases, and then select Synchronize with Database.

Reconnecting to SQL Server

Your connection to SQL Server stays active until you close the project. When you reopen the project, you must reconnect to SQL Server if you want an active connection to the server. You can work offline until you load database objects into SQL Server and migrate data.

The procedure for reconnecting to SQL Server is the same as the procedure for establishing a connection.

Next Steps

If you want to customize the mapping between source and target databases, see Mapping Source and Target Databases Otherwise, the next step is to convert database objects to SQL Server syntax using convert database objects

See Also

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This quickstart shows how to use Azure Data Studio to connect to SQL Server, and then use Transact-SQL (T-SQL) statements to create the TutorialDB used in Azure Data Studio tutorials.

Prerequisites

Microsoft Sql Server Cannot Connect Remote

To complete this quickstart, you need Azure Data Studio, and access to SQL Server.

  • Install Azure Data Studio.

If you don't have access to a SQL Server, select your platform from the following links (make sure you remember your SQL Login and Password!):

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  • Linux - Download SQL Server 2017 Developer Edition - You only need to follow the steps up to Create and Query Data.

Microsoft Sql Server Cannot Connect To Database

Connect to a SQL Server

  1. Start Azure Data Studio.

  2. The first time you run Azure Data Studio the Welcome page should open. If you don't see the Welcome page, select Help > Welcome. Select New Connection to open the Connection pane:

  3. This article uses SQL Login, but Windows Authentication is supported. Fill in the fields as follows:

  • Server Name: - Enter server name here. For example, localhost.

  • Authentication Type: SQL Login

  • User name: User name for the SQL Server

  • Password: Password for the SQL Server

  • Database Name: leave this field blank

  • Server Group: <Default>

Create a database

The following steps create a database named TutorialDB:

  1. Right-click on your server, localhost, and select New Query.

  2. Paste the following snippet into the query window: and then select Run.

After the query completes, the new TutorialDB appears in the list of databases. If you don't see it, right-click the Databases node and select Refresh.

Create a table

The query editor is still connected to the master database, but we want to create a table in the TutorialDB database.

  1. Change the connection context to TutorialDB:

  2. Paste the following snippet into the query window and click Run:

    Note

    You can append this too, or overwrite the previous query in the editor. Note that clicking Run executes only the query that is selected. If nothing is selected, clicking Run executes all queries in the editor.

After the query completes, the new Customers table appears in the list of tables. You might need to right-click the TutorialDB > Tables node and select Refresh.

Insert rows

Can't Connect To Sql Server

  • Paste the following snippet into the query window and click Run:

View the data returned by a query

Microsoft
  1. Paste the following snippet into the query window and click Run:

Next steps

Now that you've successfully connected to SQL Server and run a query try out the Code editor tutorial.