3.1.1 JSON_ARRAY JSON_ARRAY(val1,val2,val3...) 生成一个包含指定元素的json数组。 mysql> SELECT JSON_ARRAY(1, "abc", NULL, TRUE, CURTIME());+---------------------------------------------+ | JSON_ARRAY(1, "abc", NULL, TRUE,
1和2，并将其连接到一个json数组“fish”中，该数组有两个条目，那么fish[0]匹配0，得到一行，fish1...
NameDescription Append data to JSON document Create JSON array Append data to JSON document Insert into JSON array Return value from JSON column after evaluating path; equivalent to JSON_EXTRACT(). Whether JSON document contains specific object at path Whether JSON document contains any data at path...
("连接失败: " . $conn->connect_error); } // 查询数据 $sql = "SELECT id, name, email FROM users"; $result = $conn->query($sql); if ($result->num_rows > 0) { // 输出数据 while($row = $result->fetch_assoc()) { echo json_encode($row); } } else { echo "0 结果"; ...
string json = sb.ToString(); json = "{totalPorperty:" + dt1.Rows[0]["totalPorperty"].ToString() + ",root:" + json + "}"; return json; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.
JSON_SEARCH(json_doc, one_or_all, search_str[, escape_char[, path] ...])查询包含指定字符串的paths,并作为一个json array返回。如果有参数为NUL或path不存在,则返回NULL。one_or_all:"one"表示查询到一个即返回;"all"表示查询所有。search_str:要查询的字符串。 可以用LIKE里的'%'或‘_’匹配。
mysql> create table t(c1 json);Query OK, 0 rows affected (0.09 sec)mysql> insert into t values('{ "name":"John", "age":30, "city":"New York"}');Query OK, 1 row affected (0.01 sec)mysql> select c1->"$.age" from t;
2 rows in set (0.00 sec) 3.2.4 JSON_KEYS JSON_KEYS(json_doc[, path]) 獲取json文檔在指定路徑下的所有鍵值,返回一個json array。如果有參數為NULL或path不存在,則返回NULL。 mysql> SELECT JSON_KEYS('{"a": 1, "b": {"c": 30}}'); ...
The expression"$[*]"matches each element of the array. You can filter the rows in the result by modifying the path. For example, using"$[1]"limits extraction to the second element of the JSON array used as the source, as shown here: ...
You can filter the rows in the result by modifying the path. For example, using "$[1]" limits extraction to the second element of the JSON array used as the source, as shown here: mysql> SELECT * -> FROM -> JSON_TABLE( -> '[{"x":2,"y":"8"},{"x":"3","y":"7"},...