You can use a JSON object access expression only when querying a column of JavaScript Object Notation (JSON) data. The expression yields a character string that contains one or more JSON values found in that data. The syntax for this type of expression is sometimes called dot-notation syntax.

1. Json Import Failed Key Generator Contains An Empty Expressions
2. Json Import Failed Key Generator Contains An Empty Expression Definition
3. Json Import Failed Key Generator Contains An Empty Expression Meaning

JSON_object_access_expr::=

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Format query results as JSON, or export data from SQL Server as JSON, by adding the FOR JSON clause to a SELECT statement. Use the FOR JSON clause to simplify client applications by delegating the formatting of JSON output from the app to SQL Server. Dec 07, 2015  JSON Generator Transform. SSIS JSON Generator Transform can be used to generate single or multiple JSON documents from any type of data sources (e.g. SQL Server, MySQL, Flat File, Excel) inside data flow task.It takes multiple inputs and outputs JSON String Output Column which can be used to feed JSON to other downstream system. 1232 - ERRORARANGOINVALIDKEYGENERATOR. Will be raised when an invalid key generator description is used. 1233 - ERRORARANGOINVALIDEDGEATTRIBUTE. Will be raised when the from or to values of an edge are undefined or contain an invalid value. 1235 - ERRORARANGOINDEXCREATIONFAILED. Will be raised when an attempt to create an index. For a single targeted value, the character string contains that value, whether it is a JSON scalar value, object, or array. For multiple targeted values, the character string contains a JSON array whose elements are those values. If you omit JSONobjectkey, then the expression yields a character string that contains the JSON data in its. To generate a 2048-bit RSA public / private key pair, with a specified key ID and use, and wrapped in a standard JWK set: java -jar json-web-key-generator.jar -t RSA -s 2048 -i 1 -u sig -S The JWK generator will then output a JSON object similar to this. JSONPath expressions always refer to a JSON structure in the same way as XPath expression are used in combination with an XML document. Since a JSON structure is usually anonymous and doesn't necessarily have a 'root member object' JSONPath assumes the abstract name $ assigned to the outer level object.

Description of the illustration 'json_object_access_expr.gif'

• For table_alias, specify the alias for the table that contains the column of JSON data. This table alias is required and must be assigned to the table elsewhere in the SQL statement.

• For JSON_column, specify the name of the column of JSON data. The column must be of data type VARCHAR2, CLOB, or BLOB and an ISJSON check constraint must be defined on the column.

• You can optionally specify one or more JSON object keys. The object keys allow you to target specific JSON values in the JSON data. The first JSON_object_key must be a case-sensitive match to the key (property) name of an object member in the top level of the JSON data. If the value of that object member is another JSON object, then you can specify a second JSON_object_key that matches the key name of a member of that object, and so on. If a JSON array is encountered during any of these iterations, then the array is implicitly unwrapped and the elements of the array are evaluated using the JSON_object_key.

  The expression yields a character string of data type VARCHAR2(4000), which contains the targeted JSON value(s) as follows:

  • For a single targeted value, the character string contains that value, whether it is a JSON scalar value, object, or array.

  • For multiple targeted values, the character string contains a JSON array whose elements are those values.

  If you omit JSON_object_key, then the expression yields a character string that contains the JSON data in its entirety. In this case, the character string is of the same data type as the column of JSON data being queried.

A JSON object access expression cannot return a value larger than 4K bytes. If the value surpasses this limit, then the expression returns null. To obtain the actual value, instead use the JSON_QUERY function or the JSON_VALUE function and specify an appropriate return type with the RETURNING clause.

Examples The following examples use the j_purchaseorder table, which is created in 'Creating a Table That Contains a JSON Document: Example'. This table contains a column of JSON data called po_document. These examples return JSON values from column po_document.

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The following statement returns the value of the property with key name PONumber:

The following statement first targets the property with key name ShippingInstructions, whose value is a JSON object. The statement then targets the property with key name Phone within that object. The statement returns the value of Phone, which is a JSON array.

The following statement first targets the property with key name LineItems, whose value is a JSON array. The expression implicitly unwraps the array and evaluates its elements, which are JSON objects. Next, the statement targets the properties with key name Part, within the unwrapped objects, and finds two objects. The statement then targets the properties with key name Description within those two objects and finds string values. Because more than one value is returned, the values are returned as elements of a JSON array.

See Also:

Oracle XML DB Developer's Guide for more information on querying JSON data using dot-notation syntax

The JSON syntax is a subset of the JavaScript syntax.

JSON Syntax Rules

JSON syntax is derived from JavaScript object notation syntax:

• Data is in name/value pairs
• Data is separated by commas
• Curly braces hold objects
• Square brackets hold arrays

JSON Data - A Name and a Value

JSON data is written as name/value pairs.

A name/value pair consists of a field name (in double quotes), followed by a colon, followed by a value:

JSON names require double quotes. JavaScript names don't.

Json Import Failed Key Generator Contains An Empty Expressions

JSON - Evaluates to JavaScript Objects

The JSON format is almost identical to JavaScript objects.

In JSON, keys must be strings, written with double quotes:

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Json Import Failed Key Generator Contains An Empty Expression Definition

In JavaScript, keys can be strings, numbers, or identifier names:

JSON Values

In JSON, values must be one of the following data types:

• a string
• a number
• an object (JSON object)
• an array
• a boolean
• null

In JavaScript values can be all of the above, plus any other valid JavaScript expression, including:

• a function
• a date
• undefined

In JSON, string values must be written with double quotes:

In JavaScript, you can write string values with double or single quotes:

Json Import Failed Key Generator Contains An Empty Expression Meaning

JSON Uses JavaScript Syntax

Because JSON syntax is derived from JavaScript object notation, very little extra software is needed to work with JSON within JavaScript.

With JavaScript you can create an object and assign data to it, like this:

Example

You can access a JavaScript object like this:

It can also be accessed like this:

Data can be modified like this:

It can also be modified like this:

You will learn how to convert JavaScript objects into JSON later in this tutorial.

JavaScript Arrays as JSON

The same way JavaScript objects can be used as JSON, JavaScript arrays can also be used as JSON.

You will learn more about arrays as JSON later in this tutorial.

JSON Files

• The file type for JSON files is '.json'
• The MIME type for JSON text is 'application/json'