This MettleCI capability takes a specified set of input ISX files and modifies them based on instructions provided in a supplied YAML Recipe file. The first public interface to the Transmuter function will be made This feature is available from the MettleCI command line.

Command

From command-shellthe MettleCI Command Line, run the asset-transformer transform with command, supplying values for these parameters:

• -isx: path to an ISX archive or directory containing archives

• -user: DataStage user to credit changes to

• -transforms: path to a YAML-format Recipe file describing transforms the changes to perform

YAML file

This file should contain a list at the top level.
Each item in the list should have a property transform, containing the name of
a transform, and other properties required by that transform.

E.g:

...

Example

Assume the following:

• getmsg.isx contains a Parallel Routine definition containing the target filepath string we wish to replce

• u915264 is the valid DataStage user that we wish to credit for the last save in the routine definition

• Recipe file changeLibFileInfo.yml contains:

  Code Block
  - transform:

...

• SearchAndReplace xpath: /

...

• [contains(name(),'DSRoutineSDO')]/@modulePath

...

• searchString:

...

Transforms

AppendToAttribute

Append a string value to an attribute.

Parameters:

• xpath: Path to the attribute in the XML to modify

• appendString: String to append to the current value of the attribute

PrependToAttribute

Prepend a string value to an attribute.

Parameters:

• xpath: Path to the attribute in the XML to modify

• prependString: String to prepend to the current value of the attribute

SearchAndReplace

Perform a regex search/replace on a text node (i.e. attribute or element with
text content). If an element with child elements is provided by the xpath, the
child elements will all be removed by this operation.

Parameters:

• xpath: Path to the text node in the XML to apply search and replace

• searchString: Regex search string

• replaceString: Regex replace string

InsertElement

Adds an XML element as a child to a specified parent element.

Parameters:

• xpath: Path to the parent node. The provided element will be a child of this node

• element: XML element to insert (as a string)

InsertAttribute

Adds an attribute to an XML element. If the attribute already exists it will be
overwritten.

Parameters:

• xpath: Path to the element to add attribute to

• attributeName: name of the attribute to add

• attributeValue: value of the attribute to add

RemoveElement

Removes an XML element from the document.

Parameters:

• xpath: Path to the element to remove.

RemoveAttribute

Removes an attribute from an existing element.

Parameters:

• xpath: Path to the element the attribute is in.

• attributeName: Name of the attribute to remove.

Recipes

Change prefetch memory

Change the prefetch memory setting for an ORAOCI9 stage to 102,400,000

Config file: recipes/change_prefetchmemory.yaml

Fix ODBC SQL placeholder issue

This recipe fixes an issue where the following warning is displayed when
migrating an ODBC stage using CCMT:
[WARN] WARNING: The number of placeholders in the UPDATE statement does not match the number of key flow variables so placeholder substitution will not occur.

NOTE: this warning can occur due to a genuine bug in the job in which case this
recipe will not fix it. This is a fix for a specific, unusual scenario
(described in the yaml file).

...

• /usr/local/dstage/[A-Za-z0-9_]/Routine/([A-Za-z0-9_]*).o replaceString: /usr/local/dstage/cplusplus/routines/$1.so

Executing the following command from a command prompt…

$> mettleci asset-transformer transform
  -isx C:\Users\u915264\transmuter\getmsg.isx 
  -user u915264  
  -transforms changeStaticLibToDynamicLibFilename.yml

…will result in this output:

C:\Users\u915264\transmuter>mettleci asset-transformer transform -isx C:\Users\u915264\transmuter\getmsg.isx -user u915264 -transforms changeStaticLibToDynamicLibFilename.yml
MettleCI Command Line (build 118)
(C) 2018-2020 Data Migrators Pty Ltd
----------------------------------
ISX File: C:\Users\u915264\transmuter\getmsg.isx
----------------------------------
Applying 'SearchAndReplace' transform to asset 'getmsg'
Replaced '/usr/local/dstage/TPODS/Routine/get_msg_code.o' with '/usr/local/dstage/cplusplus/routines/get_msg_code.so'
C:\Users\u915264\transmuter>

Notes:

• The example uses a single ISX but any valid filepath (a directory, a wildcard expression, etc) can be used and all ISX files found that way will be processed

• In this example the message shows the target and replacement strings. Other transforms will produce different, transform-specific output.

See also