Getting started with DirectQuery

This tutorial requires access to the DirectQuery modules.

This tutorial will walk you through the basics of DirectQuery by creating an application on a external database. We’ll see how to:

Use the DirectQuery module in a project
Connect to the external database
Create a data model based on the external database
Use this data model in a Cube

This tutorial requires:

A external database
Familiarity with this database
Familiarity with the basic concepts of Atoti.

Building the external content

Let’s start by generating the content in the external database

Let’s create a new dataset for this tutorial

CREATE SCHEMA tutorial;

Then create the sales table and feed it with 20 facts

CREATE TABLE IF NOT EXISTS `tutorial`.SALES (
  SALE_ID STRING NOT NULL,
  DATE DATE NOT NULL,
  SHOP STRING NOT NULL,
  PRODUCT STRING NOT NULL,
  QUANTITY INT64 NOT NULL,
  UNIT_PRICE FLOAT64 NOT NULL
);
INSERT INTO `tutorial`.SALES VALUES
  ('S0010','2022-01-31','shop_2','BED_2',3,150),
  ('S0009','2022-01-31','shop_3','BED_2',1,150),
  ('S0008','2022-01-31','shop_4','BED_2',1,150),
  ('S0007','2022-02-01','shop_5','BED_2',1,150),
  ('S0019','2022-02-02','shop_3','HOO_5',1,48),
  ('S0018','2022-02-03','shop_3','HOO_5',1,48),
  ('S0017','2022-02-04','shop_3','HOO_5',1,48),
  ('S0000','2022-02-04','shop_0','TAB_0',1,210),
  ('S0001','2022-02-03','shop_1','TAB_0',1,210),
  ('S0002','2022-02-02','shop_2','TAB_0',1,210),
  ('S0003','2022-02-01','shop_3','TAB_0',1,210),
  ('S0004','2022-02-03','shop_1','TAB_1',1,300),
  ('S0005','2022-02-02','shop_2','TAB_1',1,300),
  ('S0006','2022-02-01','shop_4','TAB_1',2,300),
  ('S0013','2022-02-01','shop_4','TSH_3',1,22),
  ('S0012','2022-02-02','shop_5','TSH_3',1,22),
  ('S0011','2022-02-03','shop_5','TSH_3',1,22),
  ('S0016','2022-01-31','shop_1','TSH_4',2,24),
  ('S0015','2022-02-01','shop_2','TSH_4',2,24),
  ('S0014','2022-02-02','shop_4','TSH_4',1,24);

Let’s create and feed a PRODUCTS table containing information about the products

CREATE TABLE IF NOT EXISTS `tutorial`.PRODUCTS (
  PRODUCT_ID STRING NOT NULL,
  CATEGORY STRING NOT NULL,
  SUB_CATEGORY STRING NOT NULL,
  SIZE STRING NOT NULL,
  PURCHASE_PRICE FLOAT64 NOT NULL,
  COLOR STRING NOT NULL,
  BRAND STRING NOT NULL
);
INSERT INTO `tutorial`.PRODUCTS VALUES
  ('TAB_0','Furniture','Table','1m80',190,'black','Basic'),
  ('TAB_1','Furniture','Table','2m40',280,'white','Mega'),
  ('BED_2','Furniture','Bed','Single',127,'red','Mega'),
  ('TSH_3','Cloth','Tshirt','M',19,'brown','Over'),
  ('TSH_4','Cloth','Tshirt','L',20,'black','Over'),
  ('HOO_5','Cloth','Hoodie','M',38,'red','Mega');

Let’s create a new database for this tutorial

CREATE DATABASE IF NOT EXISTS TUTORIAL;

We can then add a PRODUCTS table containing information about our products:

CREATE TABLE IF NOT EXISTS
  TUTORIAL.PRODUCTS
(
  `PRODUCT_ID` String,
  `CATEGORY` String,
  `SUB_CATEGORY` String,
  `SIZE` String,
  `PURCHASE_PRICE` Float64,
  `COLOR` String,
  `BRAND` String
)
ENGINE = MergeTree()
PRIMARY KEY (`PRODUCT_ID`);
INSERT INTO TUTORIAL.PRODUCTS VALUES
  ('TAB_0','Furniture','Table','1m80',190,'black','Basic'),
  ('TAB_1','Furniture','Table','2m40',280,'white','Mega'),
  ('BED_2','Furniture','Bed','Single',127,'red','Mega'),
  ('TSH_3','Cloth','Tshirt','M',19,'brown','Over'),
  ('TSH_4','Cloth','Tshirt','L',20,'black','Over'),
  ('HOO_5','Cloth','Hoodie','M',38,'red','Mega');

Finally we create the SALES table and feed it with 20 individual sales:

CREATE TABLE IF NOT EXISTS
  TUTORIAL.SALES
(
  `SALE_ID` String,
  `DATE` Date32,
  `SHOP` String,
  `PRODUCT` String,
  `QUANTITY` Float64,
  `UNIT_PRICE` Float64
)
ENGINE = MergeTree()
PRIMARY KEY (`SALE_ID`);
INSERT INTO TUTORIAL.SALES VALUES
  ('S0010','2022-01-31','shop_2','BED_2',3,150),
  ('S0009','2022-01-31','shop_3','BED_2',1,150),
  ('S0008','2022-01-31','shop_4','BED_2',1,150),
  ('S0007','2022-02-01','shop_5','BED_2',1,150),
  ('S0019','2022-02-02','shop_3','HOO_5',1,48),
  ('S0018','2022-02-03','shop_3','HOO_5',1,48),
  ('S0017','2022-02-04','shop_3','HOO_5',1,48),
  ('S0000','2022-02-04','shop_0','TAB_0',1,210),
  ('S0001','2022-02-03','shop_1','TAB_0',1,210),
  ('S0002','2022-02-02','shop_2','TAB_0',1,210),
  ('S0003','2022-02-01','shop_3','TAB_0',1,210),
  ('S0004','2022-02-03','shop_1','TAB_1',1,300),
  ('S0005','2022-02-02','shop_2','TAB_1',1,300),
  ('S0006','2022-02-01','shop_4','TAB_1',2,300),
  ('S0013','2022-02-01','shop_4','TSH_3',1,22),
  ('S0012','2022-02-02','shop_5','TSH_3',1,22),
  ('S0011','2022-02-03','shop_5','TSH_3',1,22),
  ('S0016','2022-01-31','shop_1','TSH_4',2,24),
  ('S0015','2022-02-01','shop_2','TSH_4',2,24),
  ('S0014','2022-02-02','shop_4','TSH_4',1,24);

Let’s create a new schema for this tutorial

CREATE SCHEMA IF NOT EXISTS tutorial

We can then add a PRODUCTS table containing information about our products:

CREATE TABLE IF NOT EXISTS
  `tutorial`.`products` (
    `PRODUCT_ID` STRING NOT NULL,
    `CATEGORY` STRING NOT NULL,
    `SUB_CATEGORY` STRING NOT NULL,
    `SIZE` STRING NOT NULL,
    `PURCHASE_PRICE` DOUBLE NOT NULL,
    `COLOR` STRING NOT NULL,
    `BRAND` STRING NOT NULL
    );
INSERT INTO
  `tutorial`.`products`
VALUES
  ('TAB_0', 'Furniture', 'Table',  '1m80',   190, 'black', 'Basic'),
  ('TAB_1', 'Furniture', 'Table',  '2m40',   280, 'white', 'Mega'),
  ('BED_2', 'Furniture', 'Bed',    'Single', 127, 'red',   'Mega'),
  ('TSH_3', 'Cloth',     'Tshirt', 'M',      19,  'brown', 'Over'),
  ('TSH_4', 'Cloth',     'Tshirt', 'L',      20,  'black', 'Over'),
  ('HOO_5', 'Cloth',     'Hoodie', 'M',      38,  'red',   'Mega');

Finally we create the SALES table and feed it with 20 individual sales:

CREATE TABLE IF NOT EXISTS
  `tutorial`.`sales`
(
  `SALE_ID` STRING,
  `DATE` DATE,
  `SHOP` STRING,
  `PRODUCT` STRING,
  `QUANTITY` DOUBLE,
  `UNIT_PRICE` DOUBLE
);
INSERT INTO `tutorial`.`sales` VALUES
  ('S0010','2022-01-31','shop_2','BED_2',3,150),
  ('S0009','2022-01-31','shop_3','BED_2',1,150),
  ('S0008','2022-01-31','shop_4','BED_2',1,150),
  ('S0007','2022-02-01','shop_5','BED_2',1,150),
  ('S0019','2022-02-02','shop_3','HOO_5',1,48),
  ('S0018','2022-02-03','shop_3','HOO_5',1,48),
  ('S0017','2022-02-04','shop_3','HOO_5',1,48),
  ('S0000','2022-02-04','shop_0','TAB_0',1,210),
  ('S0001','2022-02-03','shop_1','TAB_0',1,210),
  ('S0002','2022-02-02','shop_2','TAB_0',1,210),
  ('S0003','2022-02-01','shop_3','TAB_0',1,210),
  ('S0004','2022-02-03','shop_1','TAB_1',1,300),
  ('S0005','2022-02-02','shop_2','TAB_1',1,300),
  ('S0006','2022-02-01','shop_4','TAB_1',2,300),
  ('S0013','2022-02-01','shop_4','TSH_3',1,22),
  ('S0012','2022-02-02','shop_5','TSH_3',1,22),
  ('S0011','2022-02-03','shop_5','TSH_3',1,22),
  ('S0016','2022-01-31','shop_1','TSH_4',2,24),
  ('S0015','2022-02-01','shop_2','TSH_4',2,24),
  ('S0014','2022-02-02','shop_4','TSH_4',1,24);

In your database, create a schema named “TUTORIAL”, and then add 2 tables with the following structure and data. Depending on your database, the actual SQL might need to be adjusted.A PRODUCTS table containing information about our products:

CREATE TABLE TUTORIAL.PRODUCTS (
    [PRODUCT_ID] VARCHAR(50) NOT NULL,
    [CATEGORY] VARCHAR(50) NOT NULL,
    [SUB_CATEGORY] VARCHAR(50) NOT NULL,
    [SIZE] VARCHAR(50) NOT NULL,
    [PURCHASE_PRICE] FLOAT NOT NULL,
    [COLOR] VARCHAR(50) NOT NULL,
    [BRAND] VARCHAR(50)  NOT NULL
    );
INSERT INTO
  TUTORIAL.PRODUCTS
VALUES
  ('TAB_0', 'Furniture', 'Table',  '1m80',   190, 'black', 'Basic'),
  ('TAB_1', 'Furniture', 'Table',  '2m40',   280, 'white', 'Mega'),
  ('BED_2', 'Furniture', 'Bed',    'Single', 127, 'red',   'Mega'),
  ('TSH_3', 'Cloth',     'Tshirt', 'M',      19,  'brown', 'Over'),
  ('TSH_4', 'Cloth',     'Tshirt', 'L',      20,  'black', 'Over'),
  ('HOO_5', 'Cloth',     'Hoodie', 'M',      38,  'red',   'Mega');

A SALES table with 20 individual sales:

CREATE TABLE TUTORIAL.SALES (
    [SALE_ID] VARCHAR(50),
    [DATE] DATE,
    [SHOP] VARCHAR(50),
    [PRODUCT] VARCHAR(50),
    [QUANTITY] BIGINT,
    [UNIT_PRICE] FLOAT
);
INSERT INTO
  TUTORIAL.SALES
VALUES
  ('S0010', '2022-01-31', 'shop_2', 'BED_2', 3, 150),
  ('S0009', '2022-01-31', 'shop_3', 'BED_2', 1, 150),
  ('S0008', '2022-01-31', 'shop_4', 'BED_2', 1, 150),
  ('S0007', '2022-02-01', 'shop_5', 'BED_2', 1, 150),
  ('S0019', '2022-02-02', 'shop_3', 'HOO_5', 1, 48),
  ('S0018', '2022-02-03', 'shop_3', 'HOO_5', 1, 48),
  ('S0017', '2022-02-04', 'shop_3', 'HOO_5', 1, 48),
  ('S0000', '2022-02-04', 'shop_0', 'TAB_0', 1, 210),
  ('S0001', '2022-02-03', 'shop_1', 'TAB_0', 1, 210),
  ('S0002', '2022-02-02', 'shop_2', 'TAB_0', 1, 210),
  ('S0003', '2022-02-01', 'shop_3', 'TAB_0', 1, 210),
  ('S0004', '2022-02-03', 'shop_1', 'TAB_1', 1, 300),
  ('S0005', '2022-02-02', 'shop_2', 'TAB_1', 1, 300),
  ('S0006', '2022-02-01', 'shop_4', 'TAB_1', 2, 300),
  ('S0013', '2022-02-01', 'shop_4', 'TSH_3', 1, 22),
  ('S0012', '2022-02-02', 'shop_5', 'TSH_3', 1, 22),
  ('S0011', '2022-02-03', 'shop_5', 'TSH_3', 1, 22),
  ('S0016', '2022-01-31', 'shop_1', 'TSH_4', 2, 24),
  ('S0015', '2022-02-01', 'shop_2', 'TSH_4', 2, 24),
  ('S0014', '2022-02-02', 'shop_4', 'TSH_4', 1, 24);

Let’s create a new dataset for this tutorial

CREATE SCHEMA TUTORIAL;

Let’s create and feed a PRODUCTS table containing information about the products

CREATE TABLE TUTORIAL.PRODUCTS (
    [PRODUCT_ID] VARCHAR(50) NOT NULL,
    [CATEGORY] VARCHAR(50) NOT NULL,
    [SUB_CATEGORY] VARCHAR(50) NOT NULL,
    [SIZE] VARCHAR(50) NOT NULL,
    [PURCHASE_PRICE] FLOAT NOT NULL,
    [COLOR] VARCHAR(50) NOT NULL,
    [BRAND] VARCHAR(50)  NOT NULL
    );
INSERT INTO
  TUTORIAL.PRODUCTS
VALUES
  ('TAB_0', 'Furniture', 'Table',  '1m80',   190, 'black', 'Basic'),
  ('TAB_1', 'Furniture', 'Table',  '2m40',   280, 'white', 'Mega'),
  ('BED_2', 'Furniture', 'Bed',    'Single', 127, 'red',   'Mega'),
  ('TSH_3', 'Cloth',     'Tshirt', 'M',      19,  'brown', 'Over'),
  ('TSH_4', 'Cloth',     'Tshirt', 'L',      20,  'black', 'Over'),
  ('HOO_5', 'Cloth',     'Hoodie', 'M',      38,  'red',   'Mega');

Then create the SALES table and feed it with 20 facts

CREATE TABLE TUTORIAL.SALES (
    [SALE_ID] VARCHAR(50),
    [DATE] DATE,
    [SHOP] VARCHAR(50),
    [PRODUCT] VARCHAR(50),
    [QUANTITY] BIGINT,
    [UNIT_PRICE] FLOAT
);
INSERT INTO
  TUTORIAL.SALES
VALUES
  ('S0010', '2022-01-31', 'shop_2', 'BED_2', 3, 150),
  ('S0009', '2022-01-31', 'shop_3', 'BED_2', 1, 150),
  ('S0008', '2022-01-31', 'shop_4', 'BED_2', 1, 150),
  ('S0007', '2022-02-01', 'shop_5', 'BED_2', 1, 150),
  ('S0019', '2022-02-02', 'shop_3', 'HOO_5', 1, 48),
  ('S0018', '2022-02-03', 'shop_3', 'HOO_5', 1, 48),
  ('S0017', '2022-02-04', 'shop_3', 'HOO_5', 1, 48),
  ('S0000', '2022-02-04', 'shop_0', 'TAB_0', 1, 210),
  ('S0001', '2022-02-03', 'shop_1', 'TAB_0', 1, 210),
  ('S0002', '2022-02-02', 'shop_2', 'TAB_0', 1, 210),
  ('S0003', '2022-02-01', 'shop_3', 'TAB_0', 1, 210),
  ('S0004', '2022-02-03', 'shop_1', 'TAB_1', 1, 300),
  ('S0005', '2022-02-02', 'shop_2', 'TAB_1', 1, 300),
  ('S0006', '2022-02-01', 'shop_4', 'TAB_1', 2, 300),
  ('S0013', '2022-02-01', 'shop_4', 'TSH_3', 1, 22),
  ('S0012', '2022-02-02', 'shop_5', 'TSH_3', 1, 22),
  ('S0011', '2022-02-03', 'shop_5', 'TSH_3', 1, 22),
  ('S0016', '2022-01-31', 'shop_1', 'TSH_4', 2, 24),
  ('S0015', '2022-02-01', 'shop_2', 'TSH_4', 2, 24),
  ('S0014', '2022-02-02', 'shop_4', 'TSH_4', 1, 24);

Let’s create a new dataset for this tutorial

CREATE SCHEMA tutorial;

Let’s create and feed a PRODUCTS table containing information about the products

SET enable_case_sensitive_identifier TO true;
CREATE TABLE dev.tutorial."PRODUCTS" (
  "PRODUCT_ID" VARCHAR NOT NULL,
  "CATEGORY" VARCHAR NOT NULL,
  "SUB_CATEGORY" VARCHAR NOT NULL,
  "SIZE" VARCHAR NOT NULL,
  "PURCHASE_PRICE" FLOAT8 NOT NULL,
  "COLOR" VARCHAR NOT NULL,
  "BRAND" VARCHAR NOT NULL,
  PRIMARY KEY ("PRODUCT_ID"));
INSERT INTO dev.tutorial."PRODUCTS" VALUES
  ('TAB_0', 'Furniture', 'Table',  '1m80',   190, 'black', 'Basic'),
  ('TAB_1', 'Furniture', 'Table',  '2m40',   280, 'white', 'Mega'),
  ('BED_2', 'Furniture', 'Bed',    'Single', 127, 'red',   'Mega'),
  ('TSH_3', 'Cloth',     'Tshirt', 'M',      19,  'brown', 'Over'),
  ('TSH_4', 'Cloth',     'Tshirt', 'L',      20,  'black', 'Over'),
  ('HOO_5', 'Cloth',     'Hoodie', 'M',      38,  'red',   'Mega');

Then create the SALES table and feed it with 20 facts

SET enable_case_sensitive_identifier TO true;
CREATE TABLE dev.tutorial."SALES" (
  "SALE_ID" VARCHAR NOT NULL,
  "DATE" DATE NOT NULL,
  "SHOP" VARCHAR NOT NULL,
  "PRODUCT" VARCHAR NOT NULL,
  "QUANTITY" FLOAT8 NOT NULL,
  "UNIT_PRICE" FLOAT8 NOT NULL,
  PRIMARY KEY ("SALE_ID"), FOREIGN KEY ("PRODUCT") references dev.tutorial."PRODUCTS"("PRODUCT_ID"));
INSERT INTO dev.tutorial."SALES" VALUES
  ('S0010', '2022-01-31', 'shop_2', 'BED_2', 3, 150),
  ('S0009', '2022-01-31', 'shop_3', 'BED_2', 1, 150),
  ('S0008', '2022-01-31', 'shop_4', 'BED_2', 1, 150),
  ('S0007', '2022-02-01', 'shop_5', 'BED_2', 1, 150),
  ('S0019', '2022-02-02', 'shop_3', 'HOO_5', 1, 48),
  ('S0018', '2022-02-03', 'shop_3', 'HOO_5', 1, 48),
  ('S0017', '2022-02-04', 'shop_3', 'HOO_5', 1, 48),
  ('S0000', '2022-02-04', 'shop_0', 'TAB_0', 1, 210),
  ('S0001', '2022-02-03', 'shop_1', 'TAB_0', 1, 210),
  ('S0002', '2022-02-02', 'shop_2', 'TAB_0', 1, 210),
  ('S0003', '2022-02-01', 'shop_3', 'TAB_0', 1, 210),
  ('S0004', '2022-02-03', 'shop_1', 'TAB_1', 1, 300),
  ('S0005', '2022-02-02', 'shop_2', 'TAB_1', 1, 300),
  ('S0006', '2022-02-01', 'shop_4', 'TAB_1', 2, 300),
  ('S0013', '2022-02-01', 'shop_4', 'TSH_3', 1, 22),
  ('S0012', '2022-02-02', 'shop_5', 'TSH_3', 1, 22),
  ('S0011', '2022-02-03', 'shop_5', 'TSH_3', 1, 22),
  ('S0016', '2022-01-31', 'shop_1', 'TSH_4', 2, 24),
  ('S0015', '2022-02-01', 'shop_2', 'TSH_4', 2, 24),
  ('S0014', '2022-02-02', 'shop_4', 'TSH_4', 1, 24);

Let’s create a new dataset for this tutorial

CREATE SCHEMA DATABASE_NAME.SCHEMA_NAME;

Let’s create and feed a PRODUCTS table containing information about the products

CREATE TRANSIENT TABLE IF NOT EXISTS PRODUCTS ( PRODUCT_ID STRING NOT NULL,CATEGORY STRING NOT NULL,SUB_CATEGORY STRING NOT NULL,SIZE STRING NOT NULL,PURCHASE_PRICE FLOAT NOT NULL,COLOR STRING NOT NULL,BRAND STRING NOT NULL, PRIMARY KEY (PRODUCT_ID));
INSERT INTO PRODUCTS SELECT 'TAB_0','Furniture','Table','1m80',190,'black','Basic';
INSERT INTO PRODUCTS SELECT 'TAB_1','Furniture','Table','2m40',280,'white','Mega';
INSERT INTO PRODUCTS SELECT 'BED_2','Furniture','Bed','Single',127,'red','Mega';
INSERT INTO PRODUCTS SELECT 'TSH_3','Cloth','Tshirt','M',19,'brown','Over';
INSERT INTO PRODUCTS SELECT 'TSH_4','Cloth','Tshirt','L',20,'black','Over';
INSERT INTO PRODUCTS SELECT 'HOO_5','Cloth','Hoodie','M',38,'red','Mega';

Then create the sales table and feed it with 20 facts

CREATE TRANSIENT TABLE IF NOT EXISTS SALES ( SALE_ID STRING NOT NULL,DATE DATE NOT NULL,SHOP STRING NOT NULL,PRODUCT STRING NOT NULL,QUANTITY FLOAT NOT NULL,UNIT_PRICE FLOAT NOT NULL,PRIMARY KEY (SALE_ID), FOREIGN KEY (PRODUCT) references PRODUCTS(PRODUCT_ID));
INSERT INTO SALES SELECT 'S0010','2022-01-31','shop_2','BED_2',3,150;
INSERT INTO SALES SELECT 'S0009','2022-01-31','shop_3','BED_2',1,150;
INSERT INTO SALES SELECT 'S0008','2022-01-31','shop_4','BED_2',1,150;
INSERT INTO SALES SELECT 'S0007','2022-02-01','shop_5','BED_2',1,150;
INSERT INTO SALES SELECT 'S0019','2022-02-02','shop_3','HOO_5',1,48;
INSERT INTO SALES SELECT 'S0018','2022-02-03','shop_3','HOO_5',1,48;
INSERT INTO SALES SELECT 'S0017','2022-02-04','shop_3','HOO_5',1,48;
INSERT INTO SALES SELECT 'S0000','2022-02-04','shop_0','TAB_0',1,210;
INSERT INTO SALES SELECT 'S0001','2022-02-03','shop_1','TAB_0',1,210;
INSERT INTO SALES SELECT 'S0002','2022-02-02','shop_2','TAB_0',1,210;
INSERT INTO SALES SELECT 'S0003','2022-02-01','shop_3','TAB_0',1,210;
INSERT INTO SALES SELECT 'S0004','2022-02-03','shop_1','TAB_1',1,300;
INSERT INTO SALES SELECT 'S0005','2022-02-02','shop_2','TAB_1',1,300;
INSERT INTO SALES SELECT 'S0006','2022-02-01','shop_4','TAB_1',2,300;
INSERT INTO SALES SELECT 'S0013','2022-02-01','shop_4','TSH_3',1,22;
INSERT INTO SALES SELECT 'S0012','2022-02-02','shop_5','TSH_3',1,22;
INSERT INTO SALES SELECT 'S0011','2022-02-03','shop_5','TSH_3',1,22;
INSERT INTO SALES SELECT 'S0016','2022-01-31','shop_1','TSH_4',2,24;
INSERT INTO SALES SELECT 'S0015','2022-02-01','shop_2','TSH_4',2,24;
INSERT INTO SALES SELECT 'S0014','2022-02-02','shop_4','TSH_4',1,24;

Let’s create a new dataset for this tutorial.

CREATE SCHEMA TUTORIAL;

We will use csv files and in Azure Blob Storage that we will access through Synapse:

Once those files are loaded into Azure, we can create the external tables in Synapse.

IF NOT EXISTS (SELECT * from sys.external_tables WHERE name='SALES')
  CREATE EXTERNAL TABLE test_resources.TUTORIAL.SALES (
    [SALE_ID] VARCHAR(50),
    [DATE] DATE,
    [SHOP] VARCHAR(50),
    [PRODUCT] VARCHAR(50),
    [QUANTITY] BIGINT,
    [UNIT_PRICE] FLOAT
  )
  WITH (
    LOCATION = 'your-container/path/to/tuto/sales.csv',
    DATA_SOURCE = [YourDataSource],
    FILE_FORMAT = [CsvFormatWithHeader]
  )
GO

IF NOT EXISTS (SELECT * from sys.external_tables WHERE name='PRODUCTS')
  CREATE EXTERNAL TABLE test_resources.TUTORIAL.PRODUCTS (
    [PRODUCT_ID] VARCHAR(50),
    [CATEGORY] VARCHAR(50),
    [SUB_CATEGORY] VARCHAR(50),
    [SIZE] VARCHAR(50),
    [PURCHASE_PRICE] FLOAT,
    [COLOR] VARCHAR(50),
    [BRAND] VARCHAR(50)
  )
  WITH (
    LOCATION = 'your-container/path/to/tutorial/products.csv',
    DATA_SOURCE = [YourDataSource],
    FILE_FORMAT = [CsvFormatWithHeader]
  )
GO

If you have not already, you will need to create an External Data Source and an External File Format.

Importing DirectQuery modules

Additionally to classic Atoti modules you will need to import two modules:

One generic module to interact with external databases

<dependency>
    <groupId>com.activeviam.activepivot</groupId>
    <artifactId>activepivot-external-database</artifactId>
    <version>${project.version}</version>
</dependency>
<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-application</artifactId>
    <version>${project.version}</version>
</dependency>

One to connect to your specific database

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-bigquery</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-clickhouse</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-databricks</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-generic-jdbc</artifactId>
    <version>${project.version}</version>
</dependency>

You also need to add the dependency for the JDBC driver supplied by your database.

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-mssql</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-redshift</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-snowflake</artifactId>
    <version>${project.version}</version>
</dependency>

<dependency>
    <groupId>com.activeviam.directquery</groupId>
    <artifactId>api-synapse</artifactId>
    <version>${project.version}</version>
</dependency>

Using the external database in DirectQuery

Create the database connector

Let’s start by creating a connection to BigQuery.
In this example we use a service account and have set an environment variable.
For more details and options about authentication on BigQuery we recommend to follow the official documentation and read the Connect to BigQuery page.

final BigQuery bigquery =
    BigQueryOptions.newBuilder().setProjectId(PROJECT_ID).build().getService();

This connection can then be used to create a DirectQuery connector.

final DirectQueryConnector<BigqueryDatabaseSettings> connector =
    BigqueryConnectorFactory.INSTANCE.createConnector(
        BigqueryClientSettings.builder().bigQuery(bigquery).build());

Let’s start by creating a configuration which will allow us to connect to the ClickHouse database. HOST is the URL of the server hosting the database. If you run it locally, it can be “localhost”. PORT is the port on which the server is listening. The default for ClickHouse is 8123. DATABASE would be “TUTORIAL” based on the previous setup. Finally, USERNAME and PASSWORD should be set appropriately. By default, they could be left null.

final ClickhousePropertiesV2 properties =
    ClickhousePropertiesV2.builder()
        .host(HOST)
        .protocol(Protocol.HTTP)
        .port(port)
        .database("TUTORIAL")
        .userName(USERNAME)
        .password(PASSWORD)
        .build();
final ClickhouseClientSettings clientSettings =
    ClickhouseClientSettings.builder().propertiesV2(properties).build();

Then, we use these properties to create a DirectQuery connector.

final DirectQueryConnector<ClickhouseDatabaseSettings> connector =
    ClickhouseConnectorFactory.INSTANCE.createConnector(clientSettings);

For more details and options about authentication on ClickHouse we recommend to read the Connect to ClickHouse page.

Here we define properties of a Databricks connection.
We connect to a database with a user password authentication.
You can read Connect to Databricks page for more details about user authentication. The JDBC connection string also contains parameters to set the user and the database.

final DatabricksConnectionProperties properties =
    DatabricksConnectionProperties.builder()
        .connectionString(connectionString)
        .additionalOption(
            DatabricksConnectionProperties.PASSWORD_PROPERTY_KEY, "your-plain-password")
        .build();

A DirectQuery connector can be set up combining JDBC connection string and these properties.

final DatabricksClientSettings clientSettings =
    DatabricksClientSettings.builder().connectionProperties(properties).build();
final DirectQueryConnector<DatabricksDatabaseSettings> connector =
    DatabricksConnectorFactory.INSTANCE.createConnector(clientSettings);

First, one needs to implement a class implementing ISqlDialect; this class is the key component for DirectQuery to generate SQL queries which can be interpreted by your database.
For more details about the dialect, we recommend to read the Generic JDBC page.

final SqlDialect sqlDialect = MsSqlSqlDialect.sqlDialect();

Here we define properties of a generic JDBC connection.
We connect to a database with a user password authentication.

final GenericJdbcProperties properties =
    GenericJdbcProperties.builder()
        .connectionString(connectionString)
        .additionalOption("user", user)
        .additionalOption("password", password)
        .additionalOption("trustServerCertificate", "true")
        .additionalOption("database", DATABASE_NAME)
        .build();

A DirectQuery connector can be set up combining this dialect and these properties and these settings.

final GenericJdbcClientSettings clientSettings =
    GenericJdbcClientSettings.builder().properties(properties).build();
final DirectQueryConnector<GenericJdbcDatabaseSettings> connector =
    GenericJdbcConnectorMetaFactory.createConnectorFactory(sqlDialect)
        .createConnector(clientSettings);

Let’s start by creating a configuration which will allow us to connect to the Microsoft SQL Server database. HOST is the URL of the server hosting the database. If you run it locally, it can be “localhost”. PORT is the port on which the server is listening. The default for MS SQL is 1443. DATABASE would be “TUTORIAL” based on the previous setup. Finally, USERNAME and PASSWORD should be set appropriately.

final SQLServerDataSource dataSource = new SQLServerDataSource();
dataSource.setUser(username);
dataSource.setPassword(password);
// Set up the database to connect to
dataSource.setPortNumber(port);
dataSource.setDatabaseName(DATABASE_NAME);
// Setup connection security parameters
dataSource.setEncrypt("true");
dataSource.setTrustServerCertificate(true);
dataSource.setSendTimeAsDatetime(false);
// Setup number of connection attempts (first tries may fail when pool needs to warm up)
dataSource.setConnectRetryCount(CONNECT_RETRY_ATTEMPTS);
dataSource.setConnectRetryInterval(CONNECT_RETRY_INTERVAL);
final MsSqlClientSettings clientSettings =
    MsSqlClientSettings.builder().dataSource(dataSource).build();

Then, we use these properties to create a DirectQuery connector.

final DirectQueryConnector<MsSqlDatabaseSettings> connector =
    MsSqlConnectorFactory.INSTANCE.createConnector(clientSettings);

For more details and options about authentication on ClickHouse we recommend to read the Connect to MS SQL page.

Here we define properties of a Redshift connection.
We connect to a database with a user password authentication.
You can read Connect to Redshift page for more details about user authentication. The JDBC connection string also contains parameters to set the user and the database.

RedshiftProperties properties =
    RedshiftProperties.builder()
        .connectionString(connectionString)
        .additionalOption(RedshiftProperty.PASSWORD, "your-plain-password")
        .build();

Then, we use these properties to create a DirectQuery connector.

final RedshiftClientSettings clientSettings =
    RedshiftClientSettings.builder().properties(properties).build();
final DirectQueryConnector<RedshiftDatabaseSettings> connector =
    RedshiftConnectorFactory.INSTANCE.createConnector(clientSettings);

Here we define properties of a Snowflake connection.
We connect to a database with a user password authentication. Note that we set a warehouse in this connection properties.
You can read Connect to Snowflake page for more details about user authentication. The JDBC connection string also contains parameters to set the user and the database.

final SnowflakeProperties properties =
    SnowflakeProperties.builder()
        .connectionString(connectionString)
        .warehouse("your-warehouse")
        .additionalOption(SFSessionProperty.PASSWORD.getPropertyKey(), "your-plain-password")
        .build();

An Atoti DirectQuery connector can be created using these properties.

final SnowflakeClientSettings clientSettings =
    SnowflakeClientSettings.builder().properties(properties).build();
final DirectQueryConnector<SnowflakeDatabaseSettings> connector =
    SnowflakeConnectorFactory.INSTANCE.createConnector(clientSettings);

Let’s start by defining some properties to connect to Synapse.
In this example we use SQL authentication.
For more details and options about authentication on Synapse we recommend to read the Connect to Synapse page.

final SQLServerDataSource dataSource = new SQLServerDataSource();
// Setup authentication
// authenticationMethod = "SqlPassword", "ActiveDirectoryPassword", ... depending on which login
// are used
dataSource.setAuthentication(authenticationMethod);
dataSource.setUser(USERNAME);
dataSource.setPassword(PASSWORD);
// Set up the database to connect to
dataSource.setServerName(SERVER_NAME);
dataSource.setDatabaseName(DATABASE_NAME);
// Setup connection security parameters
dataSource.setEncrypt("true");
dataSource.setHostNameInCertificate(HOST_NAME_IN_CERTIFICATE);
dataSource.setTrustServerCertificate(false);
dataSource.setSendTimeAsDatetime(false);
// Setup number of connection attempts (first tries may fail when pool needs to warm up)
dataSource.setConnectRetryCount(CONNECT_RETRY_ATTEMPTS);
dataSource.setConnectRetryInterval(CONNECT_RETRY_INTERVAL);
dataSource.setLoginTimeout(CONNECT_RETRY_ATTEMPTS * CONNECT_RETRY_INTERVAL);
final SynapseClientSettings clientSettings =
    SynapseClientSettings.builder().dataSource(dataSource).build();

Then, we use this data source to create a DirectQuery connector.

final DirectQueryConnector<SynapseDatabaseSettings> connector =
    SynapseConnectorFactory.INSTANCE.createConnector(clientSettings);

Add external tables into DirectQuery

The second step is to create the external database schema description.
We start by building the table definition. This can be done either with the help of an external database discoverer or by manually building the description of the tables. Let’s first create a discoverer from the connector. Note that there are settings for the discoverer to customize the behavior but in this example we will use the default ones.

final IDirectQueryTableDiscoverer discoverer = connector.getDiscoverer();