Delete a node tree element
Verified
Added by iNTERFACEWARE
Use node.remove() to delete an element from a table,
Source Code
-- node.remove() works on any node tree -- an HL7 node tree is used to demonstrate local Msg, Name = hl7.parse{vmd='example/demo.vmd', data=Data} local Out = hl7.message{vmd='example/demo.vmd', name=Name} Out:mapTree(Msg) -- delete a specified node - "OBX" for example local deleted = Out:remove('OBX') trace(Out) trace(deleted)
Description
Use node.remove() to delete an element from a table,
Usage Details
Use node.remove()
to delete an element from a node tree. We use an HL7 node tree as an example, but the function works for all node trees.
How to use the snippet:
- Paste the code into your script
Note: You may also want to look at the table.remove()
function to delete elements from Lua tables.
Added by iNTERFACEWARE
Code to connect to commonly used databases (connecting to other databases is very similar).
Added by iNTERFACEWARE
How to parse an HL7 message and create an HL7 output message
Added by iNTERFACEWARE
Use pcall() to trap errors by calling a function in protected mode (use to prevent a channel from stopping on "innocent" errors).
Added by iNTERFACEWARE
Use the error() function to raise an error and write it to the logs
Added by iNTERFACEWARE
How to create Error, Warning, Informational, and Debug log entries
Added by iNTERFACEWARE
How to open and read a file from disk, either one line at a time, or read the whole file at once
Added by iNTERFACEWARE
How to convert numbers and node trees to a to string representation, and how to convert a numeric strings to numbers
Added by iNTERFACEWARE
How to parse an XML message using xml.parse()
Added by iNTERFACEWARE
Using date and time functions with some formatting examples
Added by iNTERFACEWARE
Execute programs and batch files, you can also load results from a directory listing etc.
Added by iNTERFACEWARE
Convert characters to/from numeric codes, the codes will vary depending on the code page settings
Added by iNTERFACEWARE
Find the position of the first instance of a string (pattern) within a string, returns the start and end indices
Added by iNTERFACEWARE
Use string.gsub() to find and replace one or more instances of text within a string
Added by iNTERFACEWARE
Using # or string.len() to find the length of a string, the result is the same
Added by iNTERFACEWARE
Convert a string to upper case with string.upper(), or lower case with string.lower()
Added by iNTERFACEWARE
Use the string.split() function to split a string into parts separated by a specified delimiter
Added by iNTERFACEWARE
Use string.sub() to return part of a string, by specifying the start and end positions
Added by iNTERFACEWARE
Use conn:query() to select data from a table in a database
Added by iNTERFACEWARE
Use conn:execute() to insert data into a database table
Added by iNTERFACEWARE
Use conn:execute() to update a database table