ETL - Blocks

When OrientDB executes the ETL module, blocks in the ETL configuration define components to execute in the process. The ETL module in OrientDB supports the following types of blocks:

• "let"
• "code"
• "console"

Let Blocks

In a "let" block, you can define variables to the ETL process context.

• Component name: let

Syntax

Examples

• Assign a value to the file path variable

  { 
    "let": { 
      "name": "$filePath",
      "value": "/temp/myfile"
    } 
  }
  

• Concat the $fileName variable to the $fileDirectory to create a new variable for $filePath:

  { 
     "let": { 
        "name": "$filePath",  
        "expression": "$fileDirectory.append($fileName )"
     } 
  }
  

Code Blocks

In the "code" block, you can configure code snippets to execute in any JVM-supported languages. The default language is JavaScript.

• Component name: code

Syntax

Examples

• Execute a Hello, World! program in JavaScript, through the ETL module:

  { 
     "code": { 
        "language": "Javascript",
        "code": "print('Hello World!');"
     }
  }
  

Console Block

In a "console" block, you can define commands OrientDB executes through the Console.

• Component name: console

Syntax

Example

• Invoke the console with a file containing the commands:

  { 
     "console": { 
        "file": "/temp/commands.sql"
     } 
   }
  

• Invoke the console with an array of commands:

  { 
     "console": {
        "commands": [
           "CONNECT plocal:/temp/db/mydb admin admin",
           "INSERT INTO Account set name = 'Luca'"
        ]
    }
  }