6.20. SQL Server Connector

6.20. SQL Server Connector

The SQL Server connector allows querying and creating tables in anexternal SQL Server database. This can be used to join data betweendifferent systems like SQL Server and Hive, or between two differentSQL Server instances.

Configuration

To configure the SQL Server connector, create a catalog properties filein etc/catalog named, for example, sqlserver.properties, tomount the SQL Server connector as the sqlserver catalog.Create the file with the following contents, replacing theconnection properties as appropriate for your setup:

connector.name=sqlserver
connection-url=jdbc:sqlserver://[serverName[\instanceName][:portNumber]]
connection-user=root
connection-password=secret

Multiple SQL Server Databases or Servers

The SQL Server connector can only access a single database withina SQL Server server. Thus, if you have multiple SQL Server databases,or want to connect to multiple instances of the SQL Server, you must configuremultiple catalogs, one for each instance.

To add another catalog, simply add another properties file to etc/catalogwith a different name (making sure it ends in .properties). For example,if you name the property file sales.properties, Presto will create acatalog named sales using the configured connector.

Querying SQL Server

The SQL Server connector provides access to all schemas visible to the specified user in the configured database.For the following examples, assume the SQL Server catalog is sqlserver.

You can see the available schemas by running SHOW SCHEMAS:

SHOW SCHEMAS FROM sqlserver;

If you have a schema named web, you can view the tablesin this schema by running SHOW TABLES:

SHOW TABLES FROM sqlserver.web;

You can see a list of the columns in the clicks table in the web databaseusing either of the following:

DESCRIBE sqlserver.web.clicks;
SHOW COLUMNS FROM sqlserver.web.clicks;

Finally, you can query the clicks table in the web schema:

SELECT * FROM sqlserver.web.clicks;

If you used a different name for your catalog properties file, usethat catalog name instead of sqlserver in the above examples.

SQL Server Connector Limitations

Presto supports connecting to SQL Server 2016, SQL Server 2014, SQL Server 2012and Azure SQL Database.

Presto supports the following SQL Server data types.The following table shows the mappings between SQL Server and Presto data types.

SQL Server Type	Presto Type
`bigint`	`bigint`
`smallint`	`smallint`
`int`	`integer`
`float`	`double`
`char(n)`	`char(n)`
`varchar(n)`	`varchar(n)`
`date`	`date`

Complete list of SQL Server data types.

The following SQL statements are not yet supported:

DELETE
ALTER TABLE
CREATE TABLE (CREATE TABLE AS is supported)
GRANT
REVOKE