C語言是一種強大的編程語言,而Oracle是一種流行的數據庫管理系統。JSON6是一種擴展的JSON格式,用于傳輸復雜的數據結構。
JSON6示例: { /* Yes, trailing commas are valid in JSON6 */ foo: 'bar', while: true, this: 'is a \ multi-line string', /* …and comments, even */ 'x': 1, /* omitting a value is the same as null, NaN, false */ y: , z: { "quoted": [1, 2, 3], what: null, "hello": "world" } }
Oracle提供了一些強大的JSON函數,可以輕松地操作JSON數據。使用Oracle的JSON函數,可以對JSON數據執行各種操作,例如插入、更新、刪除和查詢操作。
CREATE TABLE emp ( id NUMBER, name VARCHAR2(100), salary NUMBER, address JSON, PRIMARY KEY (id) ); INSERT INTO emp VALUES (1, 'John', 1000, '{"street": "123 Main St", "city": "New York", "state": "NY"}'); SELECT JSON_VALUE(address, '$.city') as city FROM emp; -- Output: "New York" UPDATE emp SET address = JSON_SET(address, '$.state', 'CA') WHERE id = 1; -- Now the address JSON looks like: {"street": "123 Main St", "city": "New York", "state": "CA"} DELETE JSON_VALUE(address, '$.city') FROM emp WHERE id = 1; -- Now the address JSON looks like: {"street": "123 Main St", "state": "CA"}
在C語言中,我們可以使用JSON-C庫來解析JSON數據。該庫提供了一些功能,例如解析JSON、構建JSON、遍歷JSON等。
#include#include #include int main() { const char *json_string = "{\"name\":\"John\",\"age\":25,\"city\":\"New York\"}"; json_object *obj = json_tokener_parse(json_string); printf("Name: %s\n", json_object_get_string(json_object_object_get(obj, "name"))); printf("Age: %d\n", json_object_get_int(json_object_object_get(obj, "age"))); printf("City: %s\n", json_object_get_string(json_object_object_get(obj, "city"))); json_object_put(obj); return 0; }
在這個簡單的例子中,我們使用json_tokener_parse()函數將JSON字符串解析為JSON對象。然后,我們使用json_object_object_get()函數來獲取JSON對象中名稱為"name"、"age"和"city"的屬性。最后,我們使用json_object_get_string()和json_object_get_int()函數來獲取屬性值。