Question

我刚刚开始使用PL / JSON，我能够解析非数组数据，例如名字，例如：

json_ext.get_string (json (l_list.get (i)), 'firstName');

但是，我无法弄清楚如何解析地址等数组数据，例如：

street1 := json_ext.get_string (json (l_list.get (i)), 'addresses.street1');

不起作用。

如何正确解析数组数据，使用：

street1 := json_ext.get_string (json (l_list.get (i)), 'addresses.street1');

用作例子？

以下是JSON的一个示例：

[
  {

"firstName": "Edward",   
"middleName": "Wolfgang",
"lastName": "Munster",    
"addresses": [
  {       
    "city": "",
    "addressType": "home",
    "state": "CA",
    "street1": "1313 Mockingbird Lane",
    "street2": ""
  },
  {        
    "city": "",
    "addressType": "business",
    "state": "CA",
    "street1": "123 Morgan Rd.",
    "street2": ""
  }
],  
}

以下是我正在使用的代码示例：

BEGIN
   SELECT json          
   INTO l_json
   FROM json_table
   WHERE id = 1;
    EXCEPTION
        WHEN NO_DATA_FOUND
        THEN
            l_json := NULL;
    END;


l_list := json_list (l_json);

FOR i IN 1 .. l_list.COUNT
LOOP
--These parse correctly      
  firstname := json_ext.get_string (json (l_list.get (i)), 'firstName');        
  middlename := json_ext.get_string (json (l_list.get (i)), 'middleName');
  lastname := json_ext.get_string (json (l_list.get (i)), 'lastName');      

--These do not parse at all  
  addresstype :=  json_ext.get_string (json (l_list.get (i)), 'addresses.addressType');     
  street1 := json_ext.get_string (json (l_list.get (i)), 'addresses.street1');
  street2 := json_ext.get_string (json (l_list.get (i)), 'addresses.street2');
  city := json_ext.get_string (json (l_list.get (i)), 'addresses.city');
  state := json_ext.get_string (json (l_list.get (i)), 'addresses.state');

Answer 1

这很简单。只需检索列表并迭代它：

@Service

Answer 2

上面的例子并不适用于我。我设法让以下工作。

set @n := '';
set @rn := 0;

update t
    set name = if(@n = name, concat(name, (@rn := @rn + 1)),
                  if(@n := name, if(@rn := 0, name, name), name)
                 )
    order by name;

Answer 3

检查此示例：

DECLARE
  OBJ JSON := JSON( '{"pjDATOS_CITAS":[{"SDACLAVE":"32709","PENDIENTES_CITAR":"3","CANTIDAD":"1"},{"SDACLAVE":"32708","PENDIENTES_CITAR":"3","CANTIDAD":"0"}]}' );
  LIST_VALUE JSON_LIST;  
BEGIN
    LIST_VALUE := JSON_LIST(OBJ.GET('pjDATOS_CITAS'));
    FOR I IN 1 .. LIST_VALUE.COUNT LOOP                
        DBMS_OUTPUT.PUT_LINE( 'SDACLAVE->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'SDACLAVE') );
        DBMS_OUTPUT.PUT_LINE( 'PENDIENTES_CITAR->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'PENDIENTES_CITAR') );
        DBMS_OUTPUT.PUT_LINE( 'CANTIDAD->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'CANTIDAD') );
        DBMS_OUTPUT.PUT_LINE( '-------------------------------------------------' );          
    END LOOP;
END;

并且您需要修复JSON文件...使用JSON检查此示例：

DECLARE
  OBJ JSON := JSON( '{"info_any": {"middleName": "Wolfgang","lastName": "Munster","addresses": [{"city": "","state": "CA","addressType": "home","street2": "","street1": "1313 Mockingbird Lane"},{"city": "","state": "CA","addressType": "business","street2": "","street1": "123 Morgan Rd."}],"firstName": "Edward"}}' );
  LIST_VALUE JSON_LIST;  
BEGIN

    OBJ := JSON ( OBJ.GET('info_any') );

    DBMS_OUTPUT.PUT_LINE( 'middleName->'||JSON_EXT.GET_STRING( OBJ , 'middleName') );
    DBMS_OUTPUT.PUT_LINE( 'firstName->' ||JSON_EXT.GET_STRING( OBJ , 'firstName') );
    DBMS_OUTPUT.PUT_LINE( 'lastName->'  ||JSON_EXT.GET_STRING( OBJ , 'lastName') );        
    DBMS_OUTPUT.PUT_LINE( '-------------------------------------------------' );

    LIST_VALUE := JSON_LIST(OBJ.GET('addresses'));

    FOR i IN 1 .. LIST_VALUE.COUNT LOOP
        DBMS_OUTPUT.PUT_LINE( 'city->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'city') );
        DBMS_OUTPUT.PUT_LINE( 'state->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'state') );
        DBMS_OUTPUT.PUT_LINE( 'addressType->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'addressType') );
        DBMS_OUTPUT.PUT_LINE( 'street2->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'street2') );
        DBMS_OUTPUT.PUT_LINE( 'street1->'||JSON_EXT.GET_STRING( JSON(LIST_VALUE.GET(I)) , 'street1') );
        DBMS_OUTPUT.PUT_LINE( '-------------------------------------------------' );    
    END LOOP;

END;

结果：

middleName->Wolfgang
firstName->Edward
lastName->Munster
-------------------------------------------------
city->
state->CA
addressType->home
street2->
street1->1313 Mockingbird Lane
-------------------------------------------------
city->
state->CA
addressType->business
street2->
street1->123 Morgan Rd.
-------------------------------------------------

如何使用PL / JSON解析数组数据

3 个答案: