SQL/JSON function json_value selects JSON data and returns a SQL scalar or an instance of a user-defined SQL object type or SQL collection type (varray, nested table). If json_value targets a single scalar JSON value then it returns a scalar SQL value. You can specify the SQL data ...
(JSON_VALUE Function) JSON_VALUE will return a scalar value from a JSON string for a requested key. To illustrate this we will use a different JSON string which contains an array. JSON_VALUE将从JSON字符串中为请求的键返回标量值。 为了说明这一点,我们将使用另一个包含数组的JSON字符串。 DECLAR...
json_value(@json,'$.info.address.town')astown, json_value(@json,'$.info.tags[0]')astag 2,返回JSON数据(JSON_QUERY) 使用JSON_QUERY ( expression [ , path ] ) 函数,根据Path 参数,返回JSON 数据(JSON fragment);参数path是可选的(optional),如果不指定option参数,那么默认的path是$,即,返回整个...
JSON_VALUE ( expression , path ) ArgumentsexpressionAn expression. Typically the name of a variable or a column that contains JSON text.If JSON_VALUE finds JSON that is not valid in expression before it finds the value identified by path, the function returns an error. If JSON_VALUE doesn'...
Result Returned by SQL/JSON Generation Functions By default, the generated JSON data is returned from a generation function as a SQLVARCHAR2value. You can use the optionalRETURNINGclause to specify aVARCHAR2size or to specify aCLOBorBLOBreturn value instead. WhenBLOBis the return type, the chara...
JsonKeyValue JsonKeyValue 构造函数 属性 JsonKeyName JsonValue 方法 KeyOption KeyOptionKind KeySourceKeyOption KeywordCasing KillQueryNotificationSubscriptionStatement KillStatement KillStatsJobStatement LabelStatement LedgerOption LedgerTableOption LedgerViewOption LeftFunctionCall LikePredicate LineNoStatement ...
STRICTAS$function$SELECTconcat('{', string_agg(to_json("key")||':'||"value",','),'}')::jsonFROM(SELECT*FROMjson_each("json")WHERE"key"<>"key_to_set"UNIONALLSELECT"key_to_set", to_json("value_to_set"))AS"fields" $function$; ...
FunctionDescription ISJSON Tests whether a string contains valid JSON. JSON_VALUE Extracts a scalar value from a JSON string. JSON_QUERY Extracts an object or an array from a JSON string. JSON_MODIFY Updates the value of a property in a JSON string and returns the updated JSON string. JSON...
TheJSON_VALUEfunction might return text values up to 8000 bytes (for example, as thenvarchar(4000)type). However, the values that are longer than 1700 bytes cannot be indexed. If you try to enter the value in the indexed computed column that is longer than 1700 bytes, the data manipulatio...
JSON_VALUE SQL Server函数是用于从 JSON 字符串中提取指定键的值的函数。它的语法如下: JSON_VALUE (expression, path) 其中,expression 是一个包含 JSON 字符串的列或变量,path 是要提取的键的路径。 JSON_VALUE 函数的优势在于它可以方便地从 JSON 数据中获取特定的值,而无需对整个 JSON 进行解析。它可以用...