5/6/2023 0 Comments Json query sql![]() ![]() Multiple values or a single scalar value, then you must use keywords ![]() Json_query path-expression argument targets ![]() If RFC 8259 is not supported, and if the value targeted by a RFC 8259 includes support for RFC 4627 (and RFC 7159). It allows only a JSON object or array, not a scalar, at the top level of a JSON document. If parameter compatible is less than 20 then only RFC 4627 is supported. If initialization parameter compatible is 20 or greater then Oracle Database supports IETF RFC 8259, which allows a JSON document to contain only a JSON scalar value at top level. 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). The wrapper clause determines the form of the returned string value. Keywords FORMAT JSON are not needed (or available) for json_query - JSON formatting is implicit for the return value. For example, an ASCII TAB character (Unicode character CHARACTER TABULATION, U 0009) is escaped as \t. This includes ensuring that non-ASCII characters in string values are escaped as needed. The value returned always contains well-formed JSON data. Otherwise, VARCHAR2 is the default return type. The default return type (no RETURNING clause) depends on the inputĭata type. A BLOB result is in the A元2UTF8 character set. In the RETURNING clause you can specify data type JSON, VARCHAR2, CLOB, or BLOB. The order of array indexes and ranges, multiple occurrences of an index, and duplication of a specified position due to range overlaps all matter. In a path-expression array step, each of the specified positions is matched against the data, in order, no matter how it is specified. The path expression can target any number of JSON values. The second argument to json_query is a SQL/JSON path expression Item for evaluating the path expression (described The result of evaluating the expression is used as the context Value, a PL/SQL variable, or a bind variable with proper casting. SQL data type that contains JSON data: type JSON Foot 1, More precisely, it is a SQL expression that returns an instance of a The JSON data that you query is the first argument to json_query. ![]()
0 Comments
Leave a Reply. |