mysql_request plugin
Applies to: ✅ Azure Data Explorer
The mysql_request
plugin sends a SQL query to an Azure MySQL Server network endpoint and returns the first rowset in the results. The query may return more than one rowset, but only the first rowset is made available for the rest of the Kusto query.
The plugin is invoked with the evaluate
operator.
Important
The mysql_request
plugin is disabled by default.
To enable the plugin, run the .enable plugin mysql_request
command. To see which plugins are enabled, use .show plugin
management commands.
Syntax
evaluate
mysql_request
(
ConnectionString ,
SqlQuery [,
SqlParameters] )
[:
OutputSchema]
Learn more about syntax conventions.
Parameters
Name | Type | Required | Description |
---|---|---|---|
ConnectionString | string |
✔️ | The connection string that points at the MySQL Server network endpoint. See authentication and how to specify the network endpoint. |
SqlQuery | string |
✔️ | The query that is to be executed against the SQL endpoint. Must return one or more row sets. Only the first set is made available for the rest of the query. |
SqlParameters | dynamic |
A property bag object that holds key-value pairs to pass as parameters along with the query. | |
OutputSchema | The names and types for the expected columns of the mysql_request plugin output.Syntax: ( ColumnName : ColumnType [, ...] ) |
Note
- Specifying the OutputSchema is highly recommended, as it allows the plugin to be used in scenarios that might otherwise not work without it, such as a cross-cluster query. The OutputSchema can also enable multiple query optimizations.
- An error is raised if the run-time schema of the first row set returned by the SQL network endpoint doesn't match the OutputSchema schema.
Authentication and authorization
To authorize to a MySQL Server network endpoint, you need to specify the authorization information in the connection string. The supported authorization method is via username and password.
Set callout policy
The plugin makes callouts to the MySql database. Make sure that the cluster's callout policy enables calls of type mysql
to the target MySqlDbUri.
The following example shows how to define the callout policy for MySQL databases. We recommend restricting the callout policy to specific endpoints (my_endpoint1
, my_endpoint2
).
[
{
"CalloutType": "mysql",
"CalloutUriRegex": "my_endpoint1\\.mysql\\.database\\.chinacloudapi\\.cn",
"CanCall": true
},
{
"CalloutType": "mysql",
"CalloutUriRegex": "my_endpoint2\\.mysql\\.database\\.chinacloudapi\\.cn",
"CanCall": true
}
]
The following example shows an .alter callout policy
command for mysql
CalloutType:
.alter cluster policy callout @'[{"CalloutType": "mysql", "CalloutUriRegex": "\\.mysql\\.database\\.chinacloudapi\\.cn", "CanCall": true}]'
Username and password authentication
The mysql_request
plugin only supports username and password authentication to the MySQL server endpoint and doesn't integrate with Microsoft Entra authentication.
The username and password are provided as part of the connections string using the following parameters:
User ID=...; Password=...;
Warning
Confidential or guarded information should be obfuscated from connection strings and queries so that they are omitted from any Kusto tracing. For more information, see obfuscated string literals.
Encryption and server validation
For security, SslMode
is unconditionally set to Required
when connecting to a MySQL server network endpoint. As a result, the server must be configured with a valid SSL/TLS server certificate.
Specify the network endpoint
Specify the MySQL network endpoint as part of the connection string.
Syntax:
Server
=
FQDN [Port
=
Port]
Where:
- FQDN is the fully qualified domain name of the endpoint.
- Port is the TCP port of the endpoint. By default,
3306
is assumed.
Examples
SQL query to Azure MySQL DB
The following example sends a SQL query to an Azure MySQL database. It retrieves all records from [dbo].[Table]
, and then processes the results.
Note
This example shouldn't be taken as a recommendation to filter or project data in this manner. SQL queries should be constructed to return the smallest dataset possible.
evaluate mysql_request(
'Server=contoso.mysql.database.chinacloudapi.cn; Port = 3306;'
'Database=Fabrikam;'
h'UID=USERNAME;'
h'Pwd=PASSWORD;',
'select * from `dbo`.`Table`') : (Id: int, Name: string)
| where Id > 0
| project Name
SQL query to an Azure MySQL database with modifications
The following example sends a SQL query to an Azure MySQL database
retrieving all records from [dbo].[Table]
, while appending another datetime
column,
and then processes the results on the Kusto side.
It specifies a SQL parameter (@param0
) to be used in the SQL query.
evaluate mysql_request(
'Server=contoso.mysql.database.chinacloudapi.cn; Port = 3306;'
'Database=Fabrikam;'
h'UID=USERNAME;'
h'Pwd=PASSWORD;',
'select *, @param0 as dt from `dbo`.`Table`',
dynamic({'param0': datetime(2020-01-01 16:47:26.7423305)})) : (Id:long, Name:string, dt: datetime)
| where Id > 0
| project Name
SQL query to an Azure MySQL database without a query-defined output schema
The following example sends a SQL query to an Azure MySQL database without an output schema. This is not recommended unless the schema is unknown, as it may impact the performance of the query.
evaluate mysql_request(
'Server=contoso.mysql.database.chinacloudapi.cn; Port = 3306;'
'Database=Fabrikam;'
h'UID=USERNAME;'
h'Pwd=PASSWORD;',
'select * from `dbo`.`Table`')
| where Id > 0
| project Name