如何在 OrientDB 中的自定义 javascript 函数中从 JSON 中提取 db.command 查询的结果

Question

I have this SQL code in this custom javascript.

var inLinkNodes = db.command('sql','SELECT in() FROM node where @rid = ' + relateNode);

.

return inLinkNodes;

when I return this variable, I get the following output:

Output:

[
{
"@type": "d",
"@rid": "#-2:0",
"@version": 0,
"in": [
"#17:9"
],
"@fieldTypes": "in=z"
}
]

I want only "#17:9" as the output.

I tried this following command:

return inLinkNodes[0].getRecord().field( "in" );

but this gives this following output:

[
{
"@type": "d",
"@rid": "#17:9",
"@version": 2,
"@class": "node",
"out_isLinkedTo": [
"#13:25"
],
"@fieldTypes": "out_isLinkedTo=g"
}
]

How to extract only "#17:9" as a string output?

Answer 1

你可以尝试这样的事情：

var inLinkNodes = db.command('sql','select expand(@this.exclude('@type','@rid','@version','@class')) from (SELECT in() FROM node where @rid = ' + relateNode + ')');

Answer 2

You can do this :

var inLinkNodes = db.command('sql','SELECT in().@rid FROM ' + relateNode);

Hope it helps !