CSV Map Connector
CSV Map Connector
The CSV Map connector uses ArcScript to transform flat XML files into CSV, TSV, and PSV file formats. A flat XML file is one where, in addition to the root element, the depth is not more than two levels.
The CSV Map connector has two modes of operation: the visual Designer and the scripting-focused Code view. The Designer enables you to visually establish simple relationships between document types. More complicated translations require the Code view, which leverages the ArcScript scripting language to create a mapping template between XML and a flat file structure.
To begin, from the Settings tab, upload a sample Source File and Destination File. If the structure of both sample files allows for designer-driven mapping, the visual Designer is populated with the source and destination fields. The application also attempts to populate the Code window with as much of the destination structure as it can.
This section contains all of the configurable connector properties.
Settings related to the core operation of the connector.
- Connector Id The static, unique identifier for the connector.
- Connector Type Displays the connector name and a description of what it does.
- Connector Description An optional field to provide a free-form description of the connector and its role in the flow.
- Source File A file that represents the XML structure of input documents. Any files processed by the connector should have a matching XML structure. To support designer-driven mapping, this file must be a simple XML, CSV, PSV, or TSV structure.
- Destination File A file that represents the structure of output documents. To use designer-driven mapping, this file must be a simple XML, CSV, PSV, or TSV structure.
This section defines the mapping relationship between input and output files. The Designer view can map simple XML, CSV, PSV, and TSV structures, and the Code view can map more complicated XML structures. See Using the Designer and Using Code View for details.
Settings related to the automatic processing of files by the connector.
- Send Whether messages arriving at the connector are automatically processed.
Settings related to the allocation of resources to the connector.
- Max Workers The maximum number of worker threads consumed from the threadpool to process files on this connector. If set, this overrides the default setting on the Settings > Automation page.
- Max Files The maximum number of files sent by each thread assigned to the connector. If set, this overrides the default setting on the Settings > Automation page.
- Processing Delay The amount of time (in seconds) by which the processing of files placed in the Input folder is delayed. This is a legacy setting. Best practice is to use a File connector to manage local file systems instead of this setting.
- Local File Scheme A scheme for assigning filenames to messages that are output by the connector. You can use the following macros to reference contextual information:
%ConnectorId%, %Filename%, %FilenameNoExt%, %Ext%, %ShortDate%, %LongDate%, %RegexFilename%, %DateFormat%, %Header%.
For example: %FilenameNoExt%_%ShortDate%%Ext%
- Save to Sent Folder Check this to copy files processed by the connector to the Sent folder for the connector.
- Sent Folder Scheme Instructs the connector to group messages in the Sent folder according to the selected interval. For example, the Weekly option instructs the connector to create a new subfolder each week and store all messages for the week in that folder. The blank setting tells the connector to save all messages directly in the Sent folder. For connectors that process many messages, using subfolders helps keep messsages organized and improves performance.
- Log Level The verbosity of logs generated by the connector. When you request support, set this to Debug.
- Log Subfolder Scheme Instructs the connector to group files in the Logs folder according to the selected interval. For example, the Weekly option instructs the connector to create a new subfolder each week and store all logs for the week in that folder. The blank setting tells the connector to save all logs directly in the Logs folder. For connectors that process many transactions, using subfolders helps keep logs organized and improves performance.
- Log Messages Check this to have the log entry for a processed file include a copy of the file itself. If you disable this, you might not be able to download a copy of the file from the Input or Output tabs.
Miscellaneous settings are for specific use cases.
- Other Settings Enables you to configure hidden connector settings in a semicolon-separated list (for example,
setting1=value1;setting2=value2). Normal connector use cases and functionality should not require the use of these settings.
Using the Designer
The visual designer is only available for CSV, PSV, TSV, and simple XML files. Below is an example of a simple XML document as the source file:
<actor table="actor"> <actor_id key="true">124455</actor_id> <first_name>Bob</first_name> <last_name>Smith</last_name> </actor>
This source file might be paired with the following CSV document as the destination file:
id,first name,last name,time 124455,Bob,Smith,2017-07-18T17:38:53-04:00
When these files are configured as the source and destination files, the designer displays rows in the Source Fields column for each row in the source file (actor_id, first_name, and last_name). For each field in the source, use the dropdown to select the appropriate Destination Field column. The application automatically attempts to match the source and destination fields based on the column names. In the above example, the actor_id row would automatically be matched with the id column.
Using the Code View
The Code view provides the ability to generate the mapping template manually using ArcScript. This allows for more granular control over the possible input and output formats. The code view defines how the destination file looks once rendered, with ArcScript elements dynamically filling in the template with values from the source document. ArcScript elements all start with an arc prefix: for example,
<arc:set>. Any content in the code view that is not ArcScript is included as part of the output file.
Navigating XML Input
ArcScript supports navigating complicated XML structures to parse out values from the Source File. The xmlDOMSearch operation takes an xpath as input and loads the XML structure at the given path. This operation loops for each instance of the xpath found in the source document: to load the entire document and avoid looping, provide the root element of the XML source as input to xmlDOMSearch. For example:
<arc:call op=xmlDOMSearch?xpath=/root> <!-- Inside this operation call the parsed XML elements can be accessed --> </arc:call>
Once the XML document is loaded, the xpath formatter supports reading out values from the XML at the specified xpath. This formatter accepts absolute xpaths as well as xpaths relative to the path loaded by xmlDOMSearch. The xpath formatter, like all formatters, can only be used in square brackets . For example:
<arc:call op="xmlDOMSearch?xpath=/root/author"> [xpath('name')] </arc:call>
Take the following simple XML as an example input to the above script:
<root> <author> <name>Stephen King</name> </author> <author> <name>Kurt Vonnegut</name> </author> </root>
In this example, the xmlDOMSearch operation loops over each author element in the root. Within each author loop, the value from the name element is read as content in the output file. The output file in this case would look like this:
Stephen King Kurt Vonnegut
Templating Output Data
The Code view serves as a template of the output file, and ArcScript fills in the values to the defined template. As a simple example, if data is formatted as comma-separated values, these commas can be included as part of the Code view to provide structure to the ArcScript functions. Therefore, you can generate more complex CSV files from more complicated XML structures than the Designer mode allows.
For example, take the following XML, which has nested elements that prevent the use of Designer mode:
<actor table="actor"> <actor_id key="true">12445</actor_id> <name> <first_name>Viggo</first_name> <last_name>Mortensen</last_name> </name> <actor_id key="true">12522</actor_id> <name> <first_name>Gal</first_name> <last_name>Gadot</last_name> </name> </actor>
The nested elements can be retrieved by passing the appropriate paths to ArcScript’s xpath formatter. These formatters can be placed in commas and after header names to provide the desired CSV structure, and an additional csvescape formatter ensures that the values are properly quoted:
id,first name,last name <arc:call op="xmlDOMSearch?xpath=actor"> [xpath('actor_id') | csvescape],[xpath('name/first_name') | csvescape],[xpath('name/last_name') | csvescape] </arc:call>
You can generate a wide range of text files with this mix of templating data and ArcScript calls.
Additional Scripting Features
Since full ArcScript is available in Code view, you might want to leverage ArcScript Operations in the template. For example, if the source file only includes the Id of an item in the database, but you need the actual item name, you can use the dbQuery operation to look up the name for the corresponding Id.
ArcScript also supports conditional logic in a mapping template. The arc:if keyword is one of many keywords available to help with performing conditional logic in templates. For example, if the source file contains information about customers in QuickBooks, you might want to perform different business logic for customers with an outstanding balance versus customers who have paid in full. A simple example of this use case might look like the following:
<arc:set item="Customer" attr="paidinfull" value="true" /> <arc:call op="xmlDOMSearch?xpath=Customer"> <arc:if exp="[xpath('balance')] > 0"> <arc:set item="Customer" attr="paidinfull" value="false" /> </arc:if> </arc:call> id,first name,last name, paid in full [xpath('customer_id') | csvescape],[xpath('first_name') | csvescape],[xpath('last_name') | csvescape],[Customer.paidinfull]