Oracle解析json字符串 获取指定值自定义函数代码

http://www.oschina.net/code/snippet_1162040_48289

[1].[代码] ty_tbl_str_split 跳至 [1] [2] [3] [4] [5]

CREATE OR REPLACE TYPE ty_tbl_str_split IS TABLE OF ty_row_str_split

[2].[代码] ty_row_str_split 跳至 [1] [2] [3] [4] [5]

CREATE OR REPLACE TYPE ty_row_str_split  as object (strValue VARCHAR2 (4000))

[3].[代码] fn_split函数 跳至 [1] [2] [3] [4] [5]

CREATE OR REPLACE FUNCTION fn_split(p_str       IN VARCHAR2,
                                    p_delimiter IN VARCHAR2)
  RETURN ty_tbl_str_split IS
  j         INT := 0;
  i         INT := 1;
  len       INT := 0;
  len1      INT := 0;
  str       VARCHAR2(4000);
  str_split ty_tbl_str_split := ty_tbl_str_split();
BEGIN
  len  := LENGTH(p_str);
  len1 := LENGTH(p_delimiter);


  WHILE j < len LOOP
    j := INSTR(p_str, p_delimiter, i);


    IF j = 0 THEN
      j   := len;
      str := SUBSTR(p_str, i);
      str_split.EXTEND;
      str_split(str_split. COUNT ) := ty_row_str_split(strValue => str);


      IF i >= len THEN
        EXIT;
      END IF;
    ELSE
      str := SUBSTR(p_str, i, j - i);
      i   := j + len1;
      str_split.EXTEND;
      str_split(str_split. COUNT ) := ty_row_str_split(strValue => str);
    END IF;
  END LOOP;


  RETURN str_split;
END fn_split;

[4].[代码] parsejson函数 跳至 [1] [2] [3] [4] [5]

CREATE OR REPLACE FUNCTION parsejson(p_jsonstr varchar2,p_key varchar2) RETURN VARCHAR2
IS
  rtnVal VARCHAR2(1000);
  i NUMBER(2);
  jsonkey VARCHAR2(500);
  jsonvalue VARCHAR2(1000);
  json VARCHAR2(3000);
BEGIN
  IF p_jsonstr IS NOT NULL THEN
     json := REPLACE (p_jsonstr, '{' , '' ) ;
     json := REPLACE (json, '}' , '' ) ;
     json := replace (json, '"' , '' ) ;
     FOR temprow IN ( SELECT strvalue AS VALUE FROM TABLE (fn_split(json, ',' ))) LOOP
        IF temprow.VALUE IS NOT NULL THEN
           i := 0;
           jsonkey := '' ;
           jsonvalue := '' ;
           FOR tem2 IN ( SELECT strvalue AS VALUE FROM TABLE (fn_split(temprow.value, ':' ))) LOOP
               IF i = 0 THEN
                  jsonkey := tem2.VALUE;
               END IF;
               IF i = 1 THEN
                  jsonvalue := tem2.VALUE;
               END IF;

               i := i + 1;
           END LOOP;

           IF(jsonkey = p_key) THEN
               rtnVal := jsonvalue;
           END if;
        END IF;
     END LOOP;
  END IF;
  RETURN rtnVal;
END parsejson;

[5].[代码] 执行DEMO 跳至 [1] [2] [3] [4] [5]

select parsejson( '{"rta":"0.19","status":"0","msg":"PING OK - Packet loss \u003d 0%, RTA \u003d 0.19 ms","packetloss":"0"}' , 'rta' ) from dual;