Skip to main content

Procedure

You can provide configuration to Snowflake Object Lifecycle Engine for the following operations with procedure:

  • Manage the lifecycle of new and existing procedures
  • Manage grants of a procedure

Usage​

databases:
  <database-name>:
    schemas:
      <schema-name>:
        procedures:
          <procedure-name>:
            <configuration-key>: <value>
            grants:
              <privilege>:
                - <role-name>
                - <role-name>

Supported parameters​

The engine supports the parameters listed below.

Configuration KeyRequired/OptionalData Types and ValuesDescription
return_typeRequiredStringThe return type of the procedure
statementRequiredString See here for a definition of statementSpecifies the JavaScript/Java/Python/SQL code used to create the procedure with either raw code or a file path using !dataops.include, with the file located either in the $CI_PROJECT_DIR or in the directory where the YAML configuration file is located
argumentsOptionalObject. See here for a definition of argumentList of the arguments for the procedure
commentOptionalStringSpecifies a comment for the procedure
deletedOptionalBoolean: True enables deletion prevention, False does nothingSpecifies what objects are allowed to be deleted
execute_asOptionalStringSets execute context - see caller's rights and owner's rights
external_access_integrationOptionalList of StringThe external access integration specifies network rules and secrets that specify external locations and credentials (if any) allowed for use by handler code when making requests of an external network, such as an external REST API.
grantsOptionalMap: See Supported Procedure Grants to RolesList of Privileges and Roles to which privileges are granted on the current procedure.
languageOptionalString: javascript (default), sql, pythonSpecifies the language of the stored procedure code
manage_modeOptionalString: all (default), none, grantsConfigures what properties to manage for the procedure.
See Changing Manage Mode before changing the value.
null_input_behaviorOptionalStringSpecifies the behavior of the procedure when called with null inputs
return_behaviorOptionalStringSpecifies the behavior of the procedure when returning results
runtime_versionOptional (Required for Python functions)StringSpecifies the Python runtime version in a string format. For example, specify version 3.8 as the following runtime_version: "3.8"
packagesOptionalList of StringFiles to import for Java/Python procedure
handlerOptionalStringThe handler method for Java/Python procedure
importsOptionalList of String: See here for a definition of importsImplementation files to import for Java / Python procedure
warning

During subsequent pipeline runs, a force-replacement behavior might be observed in the PLAN and APPLY phases for a few parameters like return_behavior, null_input_behavior, statement, arguments, return_type, etc.

arguments parameters​

You can specify the arguments for the procedure.

You can list multiple arguments in an object format in the arguments parameter, with each having the following supported parameter:

Configuration KeyRequired / OptionalData Types and ValuesDescription
typeRequiredStringData type of the Column
defaultOptionalString, Boolean, Null, Number (Float or Integer)The default value for the column
warning

Using the PUT or GET commands in a SQL statement throws an error due to recent updates in Snowflake releases.

Example​

arguments:
  ARG_1:
    type: VARCHAR
  ARG_2:
    type: DATE

statement parameter​

You can define the statement parameter by directly inputting raw SQL/JavaScript/Java/Python code or referencing a file path containing the desired code using the !dataops.include directive. However, ensure the file is stored either in the $CI_PROJECT_DIR directory or in the parent directory of the YAML configuration file.

This code is used to create the procedure's logic that executes complex operations or tasks within the Snowflake environment.

SQL procedure with statement​

dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          SQL_PROCEDURE:
            comment: "return 1 in JavaScript"
            language: sql
            return_type: INT
            execute_as: CALLER
            statement: SELECT 1 AS x;

JavaScript procedure with statement​

dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          JAVASCRIPT_PROCEDURE:
            comment: "return 1 in JavaScript"
            language: javascript
            return_type: FLOAT
            execute_as: CALLER
            statement: >-
              var x = 1;
              return x;

Python procedure with statement​

dataops/snowflake/databases.template.yml
databases:
  DATABASE:
    schemas:
      SCHEMA:
        procedures:
          PYTHON_PROCEDURE:
            comment: "return 1 in Python"
            language: python
            runtime_version: "3.8"
            handler: example_handler
            packages: ["snowflake-snowpark-python"]
            arguments:
              x:
                type: INT
            return_type: INT
            execute_as: CALLER
            statement: >-
              def example_handler(session, x):
                  return x

Python procedure with code uploaded from a stage​

In a complex application where numerous dependency files are uploaded to a stage, you can simplify procedure creation by accessing these files using a Python handler with imports. The handler parameter specifies what procedure to call, while the imports parameter imports the module.

dataops/snowflake/databases.template.yml
databases:
  DATABASE:
    schemas:
      SCHEMA:
        procedures:
          PYTHON_PROCEDURE:
            comment: "procedure using imports"
            language: python
            runtime_version: "3.8"
            handler: main
            imports: ['@"DATAOPS_PROD"."SAMPLES"."INTERNAL_STAGE"/project.zip']
            packages: ["snowflake-snowpark-python"]
            arguments:
              x:
                type: INT
            return_type: INT
            execute_as: CALLER
            statement: >-
              def main(session, x):
                  return imported_function(session, x)

Python procedure with handler and imports​

dataops/snowflake/databases.template.yml
databases:
  DATABASE:
    schemas:
      SCHEMA:
        procedures:
          example_python_procedure_with_imports:
            comment: "procedure using imports"
            language: python
            runtime_version: "3.8"
            handler: main
            imports: ['@"DATAOPS_PROD"."SAMPLES"."INTERNAL_STAGE"/project.zip']
            packages: ["snowflake-snowpark-python"]
            arguments:
              x:
                type: INT
            return_type: INT
            execute_as: CALLER
            statement: >-
              def main(session, x):
                  return imported_function(session, x)

imports parameter​

This parameter helps specify the implementation files to import for the Java / Python procedure, where the implementation is in a binary Python package or Jar files. However, when importing a Python module, you must have the handler and packages keywords in the DDL.

Supported procedure grants to roles​

Following are the privileges you can grant to roles in the procedure definition:

  • USAGE
  • OWNERSHIP

Examples​

JavaScript procedure​

dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          JAVASCRIPT_PROCEDURE:
            comment: "Procedure using JavaScript language"
            return_type: VARCHAR
            language: javascript
            execute_as: CALLER
            null_input_behavior: "RETURNS NULL ON NULL INPUT"
            statement: "return 1"
            arguments:
              ARG_1:
                type: VARCHAR
              ARG_2:
                type: DATE

SQL procedure​

dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          SQL_PROCEDURE:
            comment: "Procedure using SQL language"
            language: sql
            return_type: VARCHAR
            execute_as: CALLER
            statement: >-
              DECLARE
              radius_of_circle FLOAT;
              area_of_circle FLOAT;
              BEGIN
              radius_of_circle := 3;
              area_of_circle := pi() * radius_of_circle * radius_of_circle;
              RETURN area_of_circle;
              END;

Python procedure​

dataops/snowflake/databases.template.yml
databases:
  DATABASE:
    schemas:
      SCHEMA:
        procedures:
          PYTHON_PROCEDURE:
            comment: "Procedure using Python language"
            return_type: VARCHAR
            language: python
            RUNTIME_VERSION: "3.8"
            packages:
              [
                "snowflake-snowpark-python",
                "numpy",
                "pandas",
                "scikit-learn",
                "scikit-image",
              ]
            HANDLER: run
            execute_as: CALLER
            null_input_behavior: "RETURNS NULL ON NULL INPUT"
            statement: |
              def run(session):
                result = 1
                return result

Procedure having $ character in the statement​

warning

Due to a known limitation that might lead to an error, the $ character should be escaped if present in the statement parameter of the procedure definition. Instead of $, you should use ${"$"}.

dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          JAVASCRIPT_PROCEDURE:
            comment: "Procedure using JavaScript language"
            return_type: VARCHAR
            language: javascript
            execute_as: CALLER
            null_input_behavior: "RETURNS NULL ON NULL INPUT"
            statement: '
            const application = "DataOps.live";
            const message = `This is ${"$"}{application}`;
            return message;
            '
            arguments:
              ARG_1:
                type: VARCHAR
              ARG_2:
                type: DATE

Examples of the !dataops.include directive in configuration files​

You can specify the statement in a file external to the YAML configuration. If the value provided through !dataops.include is a file path, that path must be relative to the git repository root ($CI_PROJECT_DIR). However, if the value is just a file name, the engine will look for that file in the directory where the configuration file is located.

The correct way to specify that path is either !dataops.include common/files/test.sql or !dataops.include test.sql.

Examples that will not lead to the desired result are:

  • !dataops.include /test.sql - note the leading /
  • !dataops.include /home/user/workspace/common/files/test.sql - attempting to use the full path to the workspace

SQL function​

common/files/test.sql
declare
  radius_of_circle float;
  area_of_circle float;
begin
  radius_of_circle := 3;
  area_of_circle := pi() * radius_of_circle * radius_of_circle;
  return area_of_circle;
end;
dataops/snowflake/databases.template.yml
databases:
  DATAOPS_TEST_DATABASE_1_{{ env.DATAOPS_ENV_NAME }}:
    schemas:
      SCHEMA_1:
        procedures:
          TEST_PROCEDURE:
            return_type: VARCHAR(16777216)
            statement: !dataops.include common/files/test.sql
            arguments: {}
            execute_as: OWNER
            language: SQL
            manage_mode: all

Javascript function​

common/files/test.js
var my_sql_command = "select * from table1";
var statement1 = snowflake.createStatement({ sqlText: my_sql_command });
var result_set1 = statement1.execute();
// Loop through the results, processing one row at a time...
while (result_set1.next()) {
  var column1 = result_set1.getColumnValue(1);
  var column2 = result_set1.getColumnValue(2);
}
return 0.0; // Replace with something more useful.
dataops/snowflake/databases.template.yml
databases:
  DATABASE_1:
    schemas:
      SCHEMA_1:
        procedures:
          TEST_PROCEDURE:
            return_type: VARCHAR(16777216)
            statement: !dataops.include common/files/test.js
            arguments: {}
            execute_as: OWNER
            language: SQL
            manage_mode: all
Last updated on