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Access Live Snowflake Data in Spring Boot
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Snowflake JDBC Driver
Rapidly create and deploy powerful Java applications that integrate with Snowflake.
Connect to Snowflake in a Spring Boot Application using CData JDBC Snowflake Driver
Spring Boot is a framework that makes engineering Java web applications easier. It offers the ability to create standalone applications with minimal configuration. When paired with the CData JDBC driver for Snowflake, Spring Boot can work with live Snowflake data. This article shows how to configure data sources and retrieve data in your Java Spring Boot Application, using the CData JDBC Driver for Snowflake.
With built-in optimized data processing, the CData JDBC Driver offers unmatched performance for interacting with live Snowflake data. When you issue complex SQL queries to Snowflake, the driver pushes supported SQL operations, like filters and aggregations, directly to Snowflake and utilizes the embedded SQL engine to process unsupported operations client-side (often SQL functions and JOIN operations). Its built-in dynamic metadata querying allows you to work with and analyze Snowflake data using native data types.
Creating the Spring Boot Project in Java
In an IDE (in this tutorial, we use IntelliJ), choose a Maven project:
In the generated project, go to the pom.xml file, and add the required dependencies for Spring Boot:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.2</version>
<relativePath/>
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.1</version>
<executions>
<execution>
<id>id.install-file</id>
<phase>clean</phase>
<goals>
<goal>install-file</goal>
</goals>
<configuration>
<file>C:\Program Files\CData\CData JDBC Driver for Snowflake ####\lib\cdata.jdbc.snowflake.jar</file>
<groupId>org.cdata.connectors</groupId>
<artifactId>cdata-snowflake-connector</artifactId>
<version>21</version>
<packaging>jar</packaging>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.7.0</version>
</dependency>
<dependency>
<groupId>org.cdata.connectors</groupId>
<artifactId>cdata-snowflake-connector</artifactId>
<version>21</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<distributionManagement>
<repository>
<uniqueVersion>false</uniqueVersion>
<id>test</id>
<name>My Repository</name>
<url>scp://repo/maven2</url>
<layout>default</layout>
</repository>
</distributionManagement>
</project>
Project Structure
In the java directory, create a new package. Usually the name of the package is the name of the groupId (com.example) followed by the artifactId (.MDS).
Make sure that the "java" directory is the sources root; this is indicated with a blue color. You may need to right click the java directory and select Mark Directory -> Sources Root. Also, the resources directory should be marked as Resources Root.
Database Connection Properties
In the application.properties file, we set the configuration properties for the Snowflake JDBC Driver, using the Class name and JDBC URL:
spring.datasource.driver=cdata.jdbc.snowflake.SnowflakeDriver
spring.datasource.url=jdbc:snowflake:User=Admin;Password=test123;Server=localhost;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;
Built-in Connection String Designer
For assistance in constructing the JDBC URL, use the connection string designer built into the Snowflake JDBC Driver. Either double-click the JAR file or execute the jar file from the command-line.
java -jar cdata.jdbc.snowflake.jar
To connect to Snowflake:
- Set User and Password to your Snowflake credentials and set the AuthScheme property to PASSWORD or OKTA.
- Set URL to the URL of the Snowflake instance (i.e.: https://myaccount.snowflakecomputing.com).
- Set Warehouse to the Snowflake warehouse.
- (Optional) Set Account to your Snowflake account if your URL does not conform to the format above.
- (Optional) Set Database and Schema to restrict the tables and views exposed.
See the Getting Started guide in the CData driver documentation for more information.
After setting the properties in the application.properties file, we now configure them.
Data Source Configuration
First, we mark the Snowflake data source as our primary data source. Then, we create a Data Source Bean.
Create a DriverManagerDataSource.java file and create a Bean within it, as shown below. If @Bean gives an error, Spring Boot may not have loaded properly. To fix this, go to File -> Invalidate Caches and restart. Additionally, make sure that Maven has added the Spring Boot dependencies.
To create a data source bean, we use DriverManagerDataSource Class. This class allows us to set the properties of the data source. The following code shows the bean definition of our data source. Each driver should have a bean.
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Primary;
import org.springframework.core.env.Environment;
import javax.sql.DataSource;
public class DriverManagerDataSource{
@Autowired
private static Environment env;
@Bean(name ="Snowflake")
@Primary
public static DataSource SnowflakeDataSource()
{
DataSourceBuilder<?> dataSourceBuilder = DataSourceBuilder.create();
dataSourceBuilder.driverClassName("cdata.jdbc.snowflake.SnowflakeDriver");
dataSourceBuilder.url("jdbc:snowflake:User=Admin;Password=test123;Server=localhost;Database=Northwind;Warehouse=TestWarehouse;Account=Tester1;");
return dataSourceBuilder.build();
}
//@Override
public void setEnvironment( final Environment environment) {
env=environment;
}
}
Next, move the Snowflake jar file to the Documents folder (see path in command below). Then, click the
Maven icon (top right corner of IntelliJ) and click "Execute Maven Goal." Now, run the following command:
mvn install:install-file -Dfile=C:\Program Files\CData\CData JDBC Driver for Snowflake ####\lib\cdata.jdbc.snowflake.jar -DgroupId=cdata.jdbc.snowflake -DartifactId=cdata-snowflake-connector -Dversion=21 -Dpackaging=jar
After pressing enter, we see the following output:
Testing the Connection
The last step is testing the connection. We call the data source in the main method of MDSApplication.java:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import java.sql.Connection;
import java.sql.SQLException;
import static com.example.demo.DriverManagerDataSources.SnowflakeDataSource;
@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class MDSApplication {
//remove the comment on the line below
public static void main (){
SpringApplication.run(DemoApplication.class, args);
Connection conn = SnowflakeDataSource().getConnection();
System.out.println("Catalog: "+ conn.getCatalog());
}
}
The output generated should look like this:
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