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20.3.5 Documents in Tables
In MySQL, a table may contain traditional relational data, JSON
values, or both. You can combine traditional data with JSON
documents by storing the documents in columns having a native
JSON
data type.
Examples in this section use the city table in the
world_x
database.
city Table Description
The city table has five columns (or fields).
+---------------+------------+-------+-------+---------+------------------+ | Field | Type | Null | Key | Default | Extra | +---------------+------------+-------+-------+---------+------------------+ | ID | int(11) | NO | PRI | null | auto_increment | | Name | char(35) | NO | | | | | CountryCode | char(3) | NO | | | | | District | char(20) | NO | | | | | Info | json | YES | | null | | +---------------+------------+-------+-------+---------+------------------+
To insert a document into the column of a table, pass to the
values()
method a well-formed JSON document
in the correct order. In the following example, a document is
passed as the final value to be inserted into the Info column.
mysql-js> db.city.insert().
values(null, "San Francisco", "USA", "California", '{"Population":830000}')
Query OK, 1 item affected (0.01 sec)
You can issue a query with a search condition that evaluates document values in the expression.
mysql-js> db.city.select(["ID", "Name", "CountryCode", "District", "Info"]).
where("CountryCode = :country and Info->'$.Population' > 1000000").
bind('country', 'USA')
+------+----------------+-------------+----------------+-----------------------------+
| ID | Name | CountryCode | District | Info |
+------+----------------+-------------+----------------+-----------------------------+
| 3793 | New York | USA | New York | {"Population": 8008278} |
| 3794 | Los Angeles | USA | California | {"Population": 3694820} |
| 3795 | Chicago | USA | Illinois | {"Population": 2896016} |
| 3796 | Houston | USA | Texas | {"Population": 1953631} |
| 3797 | Philadelphia | USA | Pennsylvania | {"Population": 1517550} |
| 3798 | Phoenix | USA | Arizona | {"Population": 1321045} |
| 3799 | San Diego | USA | California | {"Population": 1223400} |
| 3800 | Dallas | USA | Texas | {"Population": 1188580} |
| 3801 | San Antonio | USA | Texas | {"Population": 1144646} |
+------+----------------+-------------+----------------+-----------------------------+
9 rows in set (0.01 sec)
See Working with Relational Tables and Documents for more information.
See Section 11.6, “The JSON Data Type” for a detailed description of the data type.
Document created the 26/06/2006, last modified the 26/10/2018
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