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Add PostGIS example

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A lot of people ask about this so having it in the README should help 
head off those questions!
This commit is contained in:
Sean Corfield 2019-10-19 12:12:23 -07:00
parent a732815b37
commit 370ff4f45d
1 changed files with 16 additions and 1 deletions
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README.md
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@ -19,7 +19,7 @@ All sample code in this README is automatically run as a unit test using
Note that while some of these samples show pretty-printed SQL, this is just for Note that while some of these samples show pretty-printed SQL, this is just for
README readability; honeysql does not generate pretty-printed SQL. README readability; honeysql does not generate pretty-printed SQL.
The #sql/regularize directive tells the test-runner to ignore the extraneous The `#sql/regularize` directive tells the test-runner to ignore the extraneous
whitespace. whitespace.
## Usage ## Usage
@ -326,6 +326,21 @@ call-qualify-map
=> ["SELECT foo(bar), foo.a, @var := foo.bar FROM foo WHERE (a = ? AND b = 42)" "BAZ"] => ["SELECT foo(bar), foo.a, @var := foo.bar FROM foo WHERE (a = ? AND b = 42)" "BAZ"]
``` ```
A common example in the wild is the PostGIS extension to PostgreSQL where you
have a lot of function calls needed in code:
```clojure
(-> (insert-into :sample)
(values [{:location (sql/call :ST_SetSRID
(sql/call :ST_MakePoint 0.291 32.621)
(sql/call :cast 4326 :integer))}])
(sql/format))
=> [#sql/regularize
"INSERT INTO sample (location)
VALUES (ST_SetSRID(ST_MakePoint(?, ?), CAST(? AS integer)))"
0.291 32.621 4326]
```
Raw SQL fragments that are strings are treated exactly as-is when rendered into Raw SQL fragments that are strings are treated exactly as-is when rendered into
the formatted SQL string (with no parsing or parameterization). Inline values the formatted SQL string (with no parsing or parameterization). Inline values
will not be lifted out as parameters, so they end up in the SQL string as-is. will not be lifted out as parameters, so they end up in the SQL string as-is.