Because of SQL/JSON path-expression syntax relaxation. Note that if path expression $. were used in Example 16-1 it would give the same result. For the document in Example 4-2 the phone types are "Office" and "Mobile", and the array returned is either or. For each document it returns a VARCHAR2 value whose contents represent a JSON array with elements the phone types, in an unspecified order. The error clause for json_query can specify EMPTY ON ERROR, which means that an empty array ( ) is returned in case of error (no error is raised).Ä®xample 16-1 shows an example of the use of SQL/JSON function json_query with an array wrapper. The wrapper clause determines the form of the returned string value. In the RETURNING clause you can specify only data type VARCHAR2 you cannot specify NUMBER. The path expression can target any number of JSON values. Unfortunately, shells such as Bash canât interpret and work with JSON directly. Itâs particularly popular in web applications due to its lightweight nature and compatibility with JavaScript. Getting values by Property Name or Collection Index. Overview JSON is a widely employed structured data format typically used in most modern APIs and data services. The index methods on JObject/JArray let you quickly get data by its property name on an object or index in a collection, while Children () lets you get ranges of data as IEnumerable to then query using LINQ.The second argument to json_query is a SQL/JSON path expression followed by optional clauses RETURNING, WRAPPER, ON ERROR, and ON EMPTY. LINQ to JSON provides a number of methods for getting data from its objects. In this JSON tutorial, you will be able to learn JSON examples with other technologies such as Java, PHP, Python, Ruby, jQuery, AJAX, C, Perl and Jackson. The result of evaluating the SQL expression is used as the context item for evaluating the path expression. Our JSON tutorial will help you to learn JSON fundamentals, example, syntax, array, object, encode, decode, file, date and date format. It can be a table or view column value, a PL/SQL variable, or a bind variable with proper casting. It can be of data type VARCHAR2, BLOB, or CLOB. The first argument to json_query is a SQL expression that returns an instance of a scalar SQL data type (that is, not an object or collection data type).
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