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# lr_json_delete

Deletes the values in a JSON object that match the query.

int lr_json_delete( "JsonObject=<parameter name>", QueryString=<JSON query>", ["SelectAll=<Yes|No>",] ["NotFound=<Error|Continue>",] LAST );

Alphabetical Listing - C Language Utility Functions

## Arguments

Name | Comments
--- | ---
JsonObject | The name of an object created with lr_eval_json .
QueryString | The JSON query
NotFound | Optional. One of: Error - Script run is aborted and error message is sent. (Default) Continue - Script run continues. A warning message is sent.
SelectAll | Optional: If Yes, deletes all matches. If No, deletes first match. Default is No.
LAST | Required marker for the end of the argument list.

lr_json_delete deletes items from a JSON object that match the query.

This function is not recorded. You can insert it manually into your script.

## Return Values

The number of items deleted.

## Parameterization

Parameterization is not applicable to this function.

## Example

This script shows the usage of lr_json_delete.

    TestDelete()
    {
    	int i = 0;

    	// See Example: Data file: store.json
    	lr_eval_json("Buffer/File=store.json",
    	                 "JsonObject=d_json_obj", LAST);

    	lr_json_stringify("JsonObject=d_json_obj",
    	                  "OutputParam=d_result",
    	                 LAST);
    	// 1 match
    	i = lr_json_delete("JsonObject=d_json_obj",
    	                "QueryString=$.store.name",
    	                 LAST);
    	lr_json_stringify("JsonObject=d_json_obj",
    	                  "OutputParam=d_result",
    	                 LAST);
    	if (i != 1)
    		lr_error_message("lr_json_delete should return %d, but returns %d", 1, i);

    	lr_save_string("$.store.books[*].isbn", "d_path_isbn");

    	// 2 matches
    	i = lr_json_delete("JsonObject=d_json_obj",
    	                "QueryString={d_path_isbn}",
    	                "SelectAll=Yes",
    	                 LAST);
    	if (i != 2)
    		lr_error_message("lr_json_delete should return %d, but returns %d", 2, i);

    	lr_json_stringify("JsonObject=d_json_obj",
    	                  "OutputParam=d_result",
    	                 LAST);

    	return 0;
    }

TestDelete.c(9): Notify: Saving Parameter "d_result = {"store":{"name":"Black Books","address":"No 20, J Rd","books":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]}}".

TestDelete.c(13): lr_json_delete succeed, 1 match

TestDelete.c(16): Notify: Saving Parameter "d_result = {"store":{"address":"No 20, J Rd","books":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","isbn":"0-553-21311-3","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","isbn":"0-395-19395-8","price":22.99}]}}".

TestDelete.c(22): Notify: Saving Parameter "d_path_isbn = $.store.books[*].isbn".

TestDelete.c(25): Notify: Parameter Substitution: parameter "d_path_isbn" = "$.store.books[*].isbn"

TestDelete.c(25): lr_json_delete succeed, 2 matches

TestDelete.c(32): Notify: Saving Parameter "d_result = {"store":{"address":"No 20, J Rd","books":[{"category":"reference","author":"Nigel Rees","title":"Sayings of the Century","price":8.95},{"category":"fiction","author":"Evelyn Waugh","title":"Sword of Honour","price":12.99},{"category":"fiction","author":"Herman Melville","title":"Moby Dick","price":8.99},{"category":"fiction","author":"J. R. R. Tolkien","title":"The Lord of the Rings","price":22.99}]}}".

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