json

SQL Server Data Types To JSON Data Types

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In SQL Server 2016 they are added support for outputting your query results in JSON. When you serialize your data to JSON using the FOR JSON clause, a data type conversion happens. The data types are converted from SQL Server data types to JSON supported data types.

For more information on how to convert your result set to JSON: www.sqlserver.info/syntax/json-in-sql-server/

Here is a quick reference table showing the data type conversions that are happening:

[table width=”500″ colwidth=”250|250″ colalign=”left|left”]
SQL Data Type,JSON Data Type
VARCHAR/NVARCHAR,String
CHAR/NCHAR,String
INT,Number
BIGINT,Number
FLOAT,Number
DECIMAL,Number
NUMERIC,Number
BIT,Boolean
DATETIME,String
DATETIME2,String
DATE,String
TIME,String
DATETIMEOFFSET,String
VARBINARY,Base64-encoded string
BINARY,Base64-encoded string
IMAGE,Base64-encoded string
TIMESTAMP,Base64-encoded string
ROWVERSION,Base64-encoded string
UNIQUEIIDENTIFIER,String
MONEY,String
[/table]

 

JSON In SQL Server

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Finally in SQL Server 2016, Microsoft SQL Server now supports JSON serialization. It provides it through the FOR clause… like XML serialization. This will take a recordset and output it in JSON format with very little effort by the coder.

SELECT	AnimalID,
AnimalName,
Color
FROM	Animal
FOR	JSON PATH

As you can see. To get the output to come in JSON format, all you need to do is add FOR JSON PATH at the end of your query. Simple right? Here is what the results would look like.

[
	{
		"AnimalID":1,
		"AnimalName":"Dog",
		"Color":"Brown"
	},
	{
		"AnimalID":2,
		"AnimalName":"Flamingo",
		"Color":"Pink"
	},
	{
		"AnimalID":3,
		"AnimalName":"Polar Bear",
		"Color":"White"
	}
]