128 lines
3.6 KiB
Markdown
128 lines
3.6 KiB
Markdown
SQL API
|
|
=======
|
|
|
|
Request format
|
|
--------------
|
|
|
|
Supported query string parameters:
|
|
|
|
'q': Specifies the SQL query to run
|
|
Example:
|
|
'http://entrypoint?q=SELECT count(*) FROM mytable'
|
|
|
|
'format': Specifies which format to use for the response.
|
|
Supported formats: JSON (the default), GeoJSON,
|
|
CSV, SVG, SHP
|
|
|
|
'dp': Number of digits after the decimal point.
|
|
Only affects format=GeoJSON.
|
|
By default this is 6.
|
|
|
|
'api_key': Needed to authenticate in order to modify the database.
|
|
|
|
Response formats
|
|
----------------
|
|
|
|
The standard response from the CartoDB SQL API is JSON. If you are
|
|
building a web-application, the lightweight JSON format allows you to
|
|
quickly integrate data from the SQL API.
|
|
|
|
The JSON response is as follows:
|
|
```
|
|
{
|
|
time: 0.006,
|
|
total_rows: 1,
|
|
rows: [
|
|
{
|
|
year: " 2011",
|
|
the_geom: "0101000020E610...",
|
|
cartodb_id: 1,
|
|
created_at: "2012-02-06T22:50:35.778Z",
|
|
updated_at: "2012-02-12T21:34:08.193Z"
|
|
}
|
|
]
|
|
}
|
|
```
|
|
|
|
Alternatively, you can use the GeoJSON specification for returning data
|
|
from the API. To do so, simply supply the format parameter as GeoJSON.
|
|
|
|
The GeoJSON response is follows:
|
|
```
|
|
{
|
|
type: "FeatureCollection",
|
|
features: [
|
|
{
|
|
type: "Feature",
|
|
properties: {
|
|
year: " 2011",
|
|
month: 10,
|
|
day: "11",
|
|
cartodb_id: 1,
|
|
created_at: "2012-02-06T22:50:35.778Z",
|
|
updated_at: "2012-02-12T21:34:08.193Z"
|
|
},
|
|
geometry: {
|
|
type: "Point",
|
|
coordinates: [
|
|
-97.335,
|
|
35.498
|
|
]
|
|
}
|
|
}
|
|
]
|
|
}
|
|
```
|
|
|
|
TODO: csv, kml responses
|
|
|
|
Response errors
|
|
---------------
|
|
|
|
To help you debug your SQL queries, the CartoDB SQL API returns errors
|
|
as part of the JSON response. Errors come back as follows,
|
|
|
|
```
|
|
{
|
|
error: [
|
|
"syntax error at or near "LIMIT""
|
|
]
|
|
}
|
|
```
|
|
|
|
You can use these errors to help understand your SQL.
|
|
|
|
|
|
Getting table information
|
|
-------------------------
|
|
|
|
Currently, there is no public method for accessing your table schemas. The
|
|
simplest way to get table structure is to access the first row of the data:
|
|
|
|
http://entrypoint?q=SELECT * FROM mytable LIMIT 1
|
|
|
|
Write data to your CartoDB account
|
|
----------------------------------
|
|
|
|
Perform inserts or updates on your data is simple now using your API
|
|
key. All you need to do, is supply a correct SQL INSERT or UPDATE
|
|
statement for your table along with the api_key parameter for your
|
|
account. Be sure to keep these requests private, as anyone with your API
|
|
key will be able to modify your tables. A correct SQL insert statement
|
|
means that all the columns you want to insert into already exist in
|
|
your table, and all the values for those columns are the right type
|
|
(quoted string, unquoted string for geoms and dates, or numbers).
|
|
|
|
INSERT
|
|
|
|
http://entrypoint?q=INSERT INTO test_table (column_name, column_name_2, the_geom) VALUES ('this is a string', 11, ST_SetSRID(ST_Point(-110, 43),4326))&api_key={Your API key}
|
|
|
|
Updates are just as simple. Here is an example, updating a row based on
|
|
the value of the cartodb_id column.
|
|
|
|
UPDATE
|
|
|
|
http://entrypoint?q=UPDATE test_table SET column_name = 'my new string value' WHERE cartodb_id = 1 &api_key={Your API key}
|
|
|
|
|