这里的string_data是从数据库中查询到的字符串数据,使用json.loads()方法可以将字符串数据转换成jsonArray格式。 3. 类图 Database+queryData()JsonConverter+convertToJsonArray() 在类图中,Database类负责从数据库中查询数据,JsonConverter类负责将字符串数据转换成jsonArray格式。 4. 关系图 DATABASEJSONCONVERTERCO...
下面是使用JSON_ARRAY函数将字符串转换为JSON数组的示例: SELECTJSON_ARRAY('apple','banana','orange')ASfruits; 1. 该查询将返回如下结果: fruits [“apple”, “banana”, “orange”] 2.2 JSON_ARRAYAGG函数 JSON_ARRAYAGG函数用于将查询结果聚合为一个JSON数组。下面是使用JSON_ARRAYAGG函数将MySQL表中的多...
也可使用函数,常用的有 JSON_ARRAY() 和 JSON_OBJECT(),前者用于构造 JSON 数组,后者用于构造 JSON 对象。如, mysql> select json_array(1, "abc", null, true,curtime()); +---+ | json_array(1, "abc", null, true,curtime()) | +---+ | [1, "abc", null, true, "10:12:25.000000"...
JSON_INSERT(json_doc, path, val[, path, val] ...)如果不存在对应属性则插入,否则不做任何变动 JSON_REPLACE(json_doc, path, val[, path, val] ...)如果存在则替换,否则不做任何变动 JSON_REMOVE(json_doc, path[, path] ...)如果存在则删除对应属性,否则不做任何变动 查询数据 1、使用json_extr...
29.000000"]//JSON_QUOTE 将JSON对象转义成String, 就是将内部的符 号进行转义,并整体包裹上双引号;JSON_QUOTE(' "null" ')//结果 "\"null\""//将JSON内容美化并输出;JSON_PRETTY()//可以将JSON/JSON内部的元素转化为其他数据类型;//如下将JSON jdoc 中的id元素,转化为 unsigned int;[https://dev....
JSON_EXTRACT works for a non-arrayed JSON string but when working with an array I am unable to pull out array elements. Unless I'm doing this wrong? select JSON_EXTRACT('{"KOJC":{"Tmp":"25"}}', '$.KOJC'); +---+ | JSON_EXTRACT('{"KOJC":{"Tmp":"25"}}', '$.KOJC')...
(PreparedStatement ps, int i, JSONArray parameter, JdbcType jdbcType) throws SQLException { ps.setString(i, String.valueOf(parameter.toJSONString())); } /** * 根据列名,获取可以为空的结果 * * @param rs * @param columnName * @return * @throws SQLException */ @Override public JSONArray ...
JSON_TABLE(json_string, '$.<path>' COLUMNS ( column_name_1 <type> PATH '$.<path>', column_name_2 <type> PATH '$.<path>') ) result; To what do I set the paths? MySQL seems to object to numeric paths, e.g. $.1, which I can't use as the number will change. ...
The third and final value listed in the result is a quoted string and not an array like the second one (which is not quoted in the output); no casting of values to the JSON type is performed. To insert the array as an array, you must perform such casts explicitly, as shown here: ...
arrayLocation ::= leftBracket ( non-negative-integer | asterisk ) rightBracket keyName ::= ECMAScript-identifier | double-quoted-string-literal doubleAsterisk ::= \*\* 还是以 代码语言:txt 复制 { "a": [ [ 3, 2 ], [ { "c" : "d" }, 1 ] ], "b": { "c" : 6 }, "one ...