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support for recent (4.3.x) V8 version
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| -- ES6 / harmony features | ||
| CREATE TABLE rectangle ( | ||
| id INTEGER, | ||
| data JSON | ||
| ); | ||
| INSERT INTO rectangle (id, data) VALUES | ||
| (1, '{"width": 20.3, "height": 1.5}'), | ||
| (2, '{"width": 10.2, "height": 9.5}'), | ||
| (3, '{"width": 3.5, "height": 5.2}'), | ||
| (4, '{"width": 8.2, "height": 8.2}'), | ||
| (5, '{"width": 9.4, "height": 0.2}'), | ||
| (6, '{"width": 1.2, "height": 1.5}'); | ||
| -- for..of loop over result array with break | ||
| CREATE OR REPLACE FUNCTION get_rectangles_area(min_area NUMERIC) | ||
| RETURNS json AS $$ | ||
| var rectangles = plv8.execute('SELECT id, data FROM rectangle ORDER BY id'); | ||
| var result = []; | ||
| var area = 0.0; | ||
| for (var rectangle of rectangles) { | ||
| area += rectangle.data.width * rectangle.data.height; | ||
| result.push({id: rectangle.id, data: rectangle.data}); | ||
| if (area >= min_area) { | ||
| break; | ||
| } | ||
| } | ||
| return result; | ||
| $$ LANGUAGE plv8 STABLE STRICT; | ||
| SELECT get_rectangles_area(130.0); | ||
| get_rectangles_area | ||
| -------------------------------------------------------------------------------------------------------------------------------------- | ||
| [{"id":1,"data":{"width":20.3,"height":1.5}},{"id":2,"data":{"width":10.2,"height":9.5}},{"id":3,"data":{"width":3.5,"height":5.2}}] | ||
| (1 row) | ||
|
|
||
| -- same for..of loop, this time using a cursor within a generator | ||
| CREATE OR REPLACE FUNCTION get_rectangles_area(min_area NUMERIC) | ||
| RETURNS json AS $$ | ||
| var plan = plv8.prepare('SELECT id, data FROM rectangle ORDER BY id'); | ||
| var cursor = plan.cursor(); | ||
| var generator = function* () { | ||
| var row; | ||
| while (row = cursor.fetch()) { | ||
| yield row; | ||
| } | ||
| }; | ||
| var rectangles = generator(); | ||
| var result = []; | ||
| var area = 0.0; | ||
| for (var rectangle of rectangles) { | ||
| area += rectangle.data.width * rectangle.data.height; | ||
| result.push({id: rectangle.id, data: rectangle.data}); | ||
| if (area >= min_area) { | ||
| break; | ||
| } | ||
| } | ||
| cursor.close(); | ||
| plan.free(); | ||
| return result; | ||
| $$ LANGUAGE plv8 STABLE STRICT; | ||
| SELECT get_rectangles_area(130.0); | ||
| get_rectangles_area | ||
| -------------------------------------------------------------------------------------------------------------------------------------- | ||
| [{"id":1,"data":{"width":20.3,"height":1.5}},{"id":2,"data":{"width":10.2,"height":9.5}},{"id":3,"data":{"width":3.5,"height":5.2}}] | ||
| (1 row) | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| -- enable strict mode with GUC, which allows usage of ES6 let and const keywords | ||
| SET plv8.v8_flags = '--use_strict'; | ||
| CREATE OR REPLACE FUNCTION let_test() | ||
| RETURNS json AS $$ | ||
| let result = ['Hello, World!']; | ||
| return result; | ||
| $$ LANGUAGE plv8 STABLE STRICT; | ||
| SELECT let_test(); | ||
| let_test | ||
| ------------------- | ||
| ["Hello, World!"] | ||
| (1 row) | ||
|
|
||
| DROP FUNCTION let_test(); |
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