postgresql 儲存過程處理json字串

函式的引數傳入值為json格式的字串，通過遍歷，獲取某個字段值。之後進行處理。

下面的示例中，

p_data進行了賦值，陣列長度是2.

,

"hwf": 1,
"fqcy": 60,
"hgps": 1,
"etwd": 230720,
"uid": "fbc09a5ea974f60d4713ff9f",
"pro": "北京市",
"city": "北京市",
"dist": "海淀區",
"str": "建材城東路",
"lon": 116.3690191,
"lat": 40.0602989,
"radius": 50,
"desc": ""}],
"ret": "succ"
}

create or replace function "esys"."fntest123"()

returns "pg_catalog"."void" as $body$ begin-- routine body goes here...
declare
p_data varchar (4000);
ppp varchar(1000);
lll varchar(1000);
tempdata varchar;
rs          record;
begin
for rs in (select "value" as single_value from json_array_elements_text(p_data::json)) loop
select t1.pwd::text into ppp from (select (rs.single_value) ::json #>> '' as pwd) as t1;
raise notice 'pwd is %',ppp;
select t1.pwd::text into ppp from (select (rs.single_value) ::json #>> '' as pwd) as t1;
raise notice 'wt is %',ppp;
select t1.pwd::text into lll from (select (rs.single_value) ::json #>> '' as pwd) as t1;
raise notice 'wt_lon %',lll;
end loop;
end;
return;
end $body$
language plpgsql volatile
cost 100

注意:  pwd is 123456

注意:  wt is 
注意:  wt_lon 116.3685121
注意:  pwd is 123456
注意:  wt is 
注意:  wt_lon 116.3685121
procedure executed successfully

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