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To establish a JDBC connection between a Spring Boot application and Snowflake, you will need to follow these steps:

1. Add the Snowflake JDBC driver to your project's classpath using Maven or Gradle.

   Maven:

   <dependency>
       <groupId>net.snowflake</groupId>
       <artifactId>snowflake-jdbc</artifactId>
       <version>version_number_here</version>
   </dependency>
   

   Gradle:

   implementation 'net.snowflake:snowflake-jdbc:version_number_here'
   

2. Configure the Snowflake JDBC driver in your application.yml or application.properties file. You will need to provide your Snowflake account information, including the account name, username, password, and a role.

   Example configuration in application.yml:

   spring:
     datasource:
       url: jdbc:snowflake://youraccount.region.snowflakecomputing.com/?user=username&password=password&role=rolename
       driver-class-name: net.snowflake.client.jdbc.SnowflakeDriver
       username: username
       password: password
   

3. Use Spring's JdbcTemplate or NamedParameterJdbcTemplate to execute SQL queries against your Snowflake database.

   Example usage in a Spring Boot controller:

   @RestController
   public class MyController {
   
       private final JdbcTemplate jdbcTemplate;
   
       public MyController(JdbcTemplate jdbcTemplate) {
           this.jdbcTemplate = jdbcTemplate;
       }
   
       @GetMapping("/customer")
       public List<Customer> getCustomer() {
           return jdbcTemplate.query("SELECT * FROM mydatabase.customer", new BeanPropertyRowMapper<>(Customer.class));
       }
   }
   

   Note: replace "mydatabase.customer" with your actual Snowflake database.table.

4. Confirm that your Snowflake account's IP whitelist includes the IP address where your Spring Boot application is running.