12.9. SQL Server Connector
The SQL Server connector allows querying and creating tables in an external SQL Server database. This can be used to join data between different systems like SQL Server and Hive, or between two different SQL Server instances.
Configuration
To configure the SQL Server connector, create a catalog properties file
in etc/catalog
named, for example, sqlserver.properties
, to
mount the SQL Server connector as the sqlserver
catalog.
Create the file with the following contents, replacing the
connection 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 within a SQL Server server. Thus, if you have multiple SQL Server databases, or want to connect to multiple instances of the SQL Server, you must configure multiple catalogs, one for each instance.
See Catalog Properties for more information about configuring connectors.
Querying SQL Server
The SQL Server connector provides access to all schemas visible to the specified user in configured database.
Let’s say the SQL Server catalog is named 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 tables
in 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
database
using 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, use
that 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 2012 and Azure SQL Database.
Presto supports the following SQL Server data types. We have the mapping between SQL Server and Presto data types.
SQL Server Type | Presto Type |
---|---|
bigint |
bigint |
smallint |
smallint |
int |
integer |
tinyint |
tinyint |
float |
double |
real |
real |
char(n) |
char(n) |
varchar(n) |
varchar(n) |
text |
varchar |
nchar(n) |
char(n) |
nvarchar(n) |
varchar(n) |
text |
varchar |
date |
date |
datetime |
timestamp |
datetime2 |
timestamp |
smalldatetime |
timestamp |
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
- INSERT