If you use procedure create_view_on_path then the PATH argument you provide must be a simple SQL/JSON path expression (no filter expression), possibly with relaxation (implicit array wrapping and unwrapping), but with no array steps and no function step.īelow is my test case (from Oracle 12.2), when i say " $.ContactDetails. PL/SQL procedure successfully select json_query( dataguide,'$' pretty ) Index exec dbms_stats.gather_table_stats(user,'T',cascade=>true) The JSON data that you query is the first argument to jsonquery.More precisely, it is a SQL expression that returns an instance of a SQL data type that contains JSON data: type JSON Foot 1, VARCHAR2, CLOB, or BLOB.It can be a table or view column value, a PL/SQL variable, or a bind variable with proper casting. Using PL/SQL object syntax, users instantiate a JSON object and then add members, arrays and additional. it works with some decent amount of data in create table t(x varchar2(40) constraint t_chkĬommit create search index t_idx on t(x) PL/JSON is a generic JSON object written in PL/SQL. JSON data from a 12c native table can be recreated over to Data Miner via the new JSON Query. Select json_query( dataguide ,'$' pretty ) Generates JSON schema in the same manner as the data source node. There is a whole manual devoted to JSON-Relational Duality, so this article will just be a brief introduction to the subject. Table insert into t values(1,'') Įxec dbms_stats.gather_table_stats(user,'T',cascade=>true) JSON-relational duality views expose our relational data as JSON documents, allowing both query and DML operations to be performed using conventional SQL or directly using JSON. If you're still on 12.1 you'll have to roll your create table t(x int,y varchar2(50) ) So you can see the attributes and their values in regular SQL :)īut as I say, this is all 12.2 functionality. Just pass your JSON document to this to get it:Įven better, you can use the data guide to expose non-array values as virtual columns in the source table. As extra points we did: exercise to create Docker container for our PostgreSQL database, configured connection pooling, which is important to our production environment. There's a new function, json_dataguide, which returns the "schema" of a JSON document. how to add jsonValue method which allows us to search/sort by the JSON specific property in the query. Luckily there is another way: JSON Data Guide. ![]() But the code is a little kludgy!ĭept_json varchar2(1000) check (dept_json is json)Īrrkeys := treat ( elem as json_object_t ).get_keys ![]() If you have objects nested within arrays or other objects you can pull the attributes out. Which, as you may guess, returns the keys!īut this only returns the top-level attributes. PL/SQL comes with JSON object types which include a get_keys method.
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