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Merged
merged 4 commits into from
Feb 17, 2017
Merged

Add support for custom SQL functions #89

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abf9bc3
Introduce support for user defined functions
zauguin Feb 14, 2017
3a14459
Add support for custom aggregate functions
zauguin Feb 15, 2017
bbfff7b
Added test and documentation
zauguin Feb 15, 2017
5f421c2
Support (const) reference arguments
zauguin Feb 17, 2017
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19 changes: 19 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -304,6 +304,25 @@ sqlite::sqlite_exception has a get_code() member function to get the SQLITE3 err
catch(sqlite::exceptions::constraint e) { } */
```

Custom SQL functions
----

To extend SQLite with custom functions, you just implement them in C++:

```c++
database db(":memory:");
db.define("tgamma", [](double i) {return std::tgamma(i);});
db << "CREATE TABLE numbers (number INTEGER);";

for(auto i=0; i!=10; ++i)
db << "INSERT INTO numbers VALUES (?);" << i;

db << "SELECT number, tgamma(number+1) FROM numbers;" >> [](double number, double factorial) {
cout << number << "! = " << factorial << '\n';
};
```


NDK support
----
Just Make sure you are using the full path of your database file :
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