How can I iterate over a nested list inside Camel body?

user_1426099 0
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I am trying to access data in the incoming {body} of my incoming Json I have done the unmarshaling with Jackson and mapped it to a Java Map Class with 

  `.unmarshal().json(JsonLibrary.Jackson, java.util.Map.class)
`

My incoming Json data is something like this after unmarshal step above

{ "projectId" : 12345,
"title" : “12345 - Plant 1 Processing",
"partners": [{"partnerName": "partnerJV1", "partnerLocation": "JA"},
{"partnerName": "partnerJV2", "partnerLocation": "FL"},
{"partnerName": "partnerJV3", "partnerLocation": "OH"}
]

The partners field can have 0-N number of partnerName, partnerLocation maps.

Now I am inserting this into a SQL table with 

.to("sql:classpath:sql/sql_queries.sql")

My sql_queries.sql has the following query in it to insert data fields into the table:

INSERT INTO MY_TABLE(PID, TITLE, PartnerName1, PartnerLocation1, PartnerName2, PartnerLocation2, PartnerName3, PartnerLocation3) VALUES(:#${body['projectId']}, :#${body['title']}, :#${body['partners[0]']['partnerName']}, :#${body['partners[0]']['partnerLocation']} )

my problem is I cannot know the exact number of partners and without it I cannot write my SQL statement. I get IndexOutOfBounds exception if I access say :#${body['partners'][2]['partnerName']}

But there is only one partners in the incoming body.

So how can I in camel iterate over the nested map inside my JSON based on it's length and initialize my PartnerName, PartnerLocation fields for my insert statement?

spring-dsl apache-camel json java
2 Answers

Try like this:

            .setProperty("projectId", simple("body['projectId']"))
            .setProperty("title", simple("body['title']"))
            .setBody(simple("body['partners']"))
            .split(simple("body"))
            .process{//prepare your properties here}
            .end()
            .to("sql:classpath:sql/sql_queries.sql");

And sql will look like this:

INSERT INTO MY_TABLE(PID, TITLE, PartnerName1, PartnerLocation1, PartnerName2, PartnerLocation2, PartnerName3, PartnerLocation3) VALUES(:#${exchangeProperty.projectId}, :#${exchangeProperty.title}, :#${exchangeProperty.partnerName1}, :#${exchangeProperty.partnerLocation1} , :#${exchangeProperty.partnerName2}, :#${exchangeProperty.partnerLocation2}, :#${exchangeProperty.partnerName3}, :#${exchangeProperty.partnerLocation3}   )

UPD: for all data in 1 row

user_14797540

Ended up doing something like this:

               .process(new Processor() {
                @Override
                public void process(Exchange exchange) throws Exception {
                    Map<String, Object> body = (Map<String, Object>) exchange.getIn().getBody();
                    int i = 1;
                    for(Map entry : (List<Map>)body.get("partners"))

                            {

                              exchange.setProperty("PartnerName"+i, entry.get("partnerName"));
                              exchange.setProperty("PartnerLocation"+i, entry.get("partnerLocation"));

                              i++;
                       }

Then ended up using these fields in INSERT INTO (...PartnerName1, PartnerLocation1, PartnerName2, PartnerLocation2.....) VALUES (....:#${property.PartnerName1}, :#${property.PartnerLocation1}...)

user_14260990
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