Code Snippets

Conversion to string or number

Verified

Added by iNTERFACEWARE

How to convert numbers and node trees to a to string representation, and how to convert a numeric strings to numbers

Source Code

   -- convert a number to a string
   local number = 1234
   local string = tostring(number)
   trace(number, string)
   
   -- convert a numeric string to a number
   local string = '4321'
   local number = tonumber(string)
   trace(string, number)
   
   -- convert an HL7 node tree to a string (very common usage)
   -- works with all node trees types (HL7, XML etc)
   
   -- need a parsed HL7 message to use
   local Msg = hl7.parse{vmd = 'example/demo.vmd', data = Data} --    
   -- using tostring()
   local hl7String = tostring(Msg)
   -- the :S() function is a builtin shorthand to tostring()
   local hl7String = Msg:S()
   trace(Msg, hl7String)

Description

How to convert numbers and node trees to a to string representation, and how to convert a numeric strings to numbers

Usage Details

To convert numbers or node trees (HL7, XML etc) to strings use tostring() or the builtin :S() function (a shorthand for tostring). To convert from numeric strings to numbers use tonumber().

How to use the snippet:

Paste the desired conversion into your script

Note: If you want to convert a leaf node in a node tree you will probably want to use :nodeValue() instead of tostring() or :S().

More Information

• String conversion S() or nodeValue()?
• node.nodeValue

Append an XML node

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Code Snippets

Use node.append() to append a node to an XML node tree

Check if a node is a leaf node

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Code Snippets

Use node.isLeaf() to check if a node is a leaf node (has no children), works for all node types

Check if a node is a primary key

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Code Snippets

Use node.isKey() to check if a node is the primary key for a database table, this method only for table node trees

Check if a node is empty (null)

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Code Snippets

Use node.isNull() to check if a node is null (not present), works for all node types

Connect to a DB

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Code to connect to commonly used databases (connecting to other databases is very similar).

Continue channel processing when an error occurs

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Code Snippets

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Convert a string to upper or lower case

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Code Snippets

Convert a string to upper case with string.upper(), or lower case with string.lower()

Convert HL7 messages to/from XML

Added by iNTERFACEWARE

Code Snippets

How to convert an HL7 message to and from an XML representation, using chm.toXml{} and chm.fromXml{}

Converting characters to/from numeric codes

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Code Snippets

Convert characters to/from numeric codes, the codes will vary depending on the code page settings

Count child nodes

Added by iNTERFACEWARE

Code Snippets

Use node.childCount() to count the number of children for a specified node, works for all node types

Create a bzip2 or gzip file

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Code Snippets

How to create and unzip a bzip2 or gzip file, using filter.bzip2.deflate() and filter.bzip2.inflate() or gzip.deflate() and gzip.inflate()

Create a directory

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Code Snippets

Use os.fs.mkdir() to create a directory

Create a Generic ACK

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Code Snippets

Create a generic ACK by using a script in an LLP Listener component

Create a zip file

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Code Snippets

How to create and unzip a zip file containing multiple files and directories, using filter.zip.deflate() and filter.zip.inflate()

Creating log entries

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Code Snippets

How to create Error, Warning, Informational, and Debug log entries

Delete a directory

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Code Snippets

Use os.fs.rmdir() to delete an empty directory, if the directory is not empty an error is returned

Delete a file or directory

Added by iNTERFACEWARE

Code Snippets

Use os.remove() to delete a file or directory, only an empty directory can be deleted

Delete a node tree element

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Code Snippets

Use node.remove() to delete an element from a table,

Delete a table element

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Code Snippets

Use table.remove() to delete an element from a table

Extract html tags with PCRE regex

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Code Snippets

How to extract the tags from a string of html, using PCRE regex with string.rxmatch()

Code Repository

Conversion to string or number