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Test a user-defined aggregate function: my_sum.

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This commit is contained in:
gwenn 2015-12-20 12:23:51 +01:00
parent 468ded3e08
commit 83b9fd0aba
1 changed files with 70 additions and 10 deletions
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80
src/functions.rs
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@ -336,7 +336,7 @@ pub trait Aggregate<A, T> where T: ToResult {
/// Initializes the aggregation context.
fn init(&self) -> A; // TODO Validate: Fn(&Context)
/// "step" function called once for each row in an aggregate group.
fn step(&self, &mut Context, &mut A); // TODO Validate: Fn(&Context, A) -> A
fn step(&self, &mut Context, &mut A) -> Result<()>; // TODO Validate: Fn(&Context, A) -> A
/// Computes and sets the final result.
fn finalize(&self, &A) -> Result<T>;
}
@ -441,7 +441,7 @@ impl InnerConnection {
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
},
}
Err(err) => {
ffi::sqlite3_result_error_code(ctx.ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
@ -498,7 +498,8 @@ impl InnerConnection {
}
let ac: *mut A = if (*pac).is_null() {
let a = (*boxed_aggr).init();
Box::into_raw(Box::new(a))
*pac = Box::into_raw(Box::new(a));
*pac
} else {
*pac
};
@ -508,7 +509,21 @@ impl InnerConnection {
args: slice::from_raw_parts(argv, argc as usize),
};
(*boxed_aggr).step(&mut ctx, &mut *ac);
match (*boxed_aggr).step(&mut ctx, &mut *ac) {
Ok(_) => {}
Err(Error::SqliteFailure(err, s)) => {
ffi::sqlite3_result_error_code(ctx.ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
Err(err) => {
ffi::sqlite3_result_error_code(ctx.ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx.ctx, cstr.as_ptr(), -1);
}
}
};
}
unsafe extern "C" fn call_boxed_final<A, D, T>(ctx: *mut sqlite3_context)
where D: Aggregate<A, T>,
@ -523,16 +538,23 @@ impl InnerConnection {
return;
}
let ac: *mut A = *pac;
let a = Box::from_raw(mem::transmute(ac)); // to be freed
match (*boxed_aggr).finalize(&*ac) {
match (*boxed_aggr).finalize(&a) {
Ok(r) => r.set_result(ctx),
Err(e) => {
ffi::sqlite3_result_error_code(ctx, e.code);
if let Ok(cstr) = str_to_cstring(&e.message) {
Err(Error::SqliteFailure(err, s)) => {
ffi::sqlite3_result_error_code(ctx, err.extended_code);
if let Some(Ok(cstr)) = s.map(|s| str_to_cstring(&s)) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
}
Err(err) => {
ffi::sqlite3_result_error_code(ctx, ffi::SQLITE_CONSTRAINT_FUNCTION);
if let Ok(cstr) = str_to_cstring(err.description()) {
ffi::sqlite3_result_error(ctx, cstr.as_ptr(), -1);
}
}
};
}
let boxed_aggr: *mut D = Box::into_raw(Box::new(aggr));
@ -581,7 +603,7 @@ mod test {
use self::regex::Regex;
use {Connection, Error, Result};
use functions::Context;
use functions::{Aggregate, Context};
fn half(ctx: &Context) -> Result<c_double> {
assert!(ctx.len() == 1, "called with unexpected number of arguments");
@ -739,4 +761,42 @@ mod test {
assert_eq!(expected, result);
}
}
struct Sum;
impl Aggregate<i64, i64> for Sum {
fn init(&self) -> i64 {
0
}
fn step(&self, ctx: &mut Context, sum: &mut i64) -> Result<()> {
*sum = *sum + try!(ctx.get::<i64>(0));
Ok(())
}
fn finalize(&self, sum: &i64) -> Result<i64> {
Ok(*sum)
}
}
#[test]
fn test_sum() {
let db = Connection::open_in_memory().unwrap();
db.create_aggregate_function("my_sum", 1, true, Sum).unwrap();
let no_result = "SELECT my_sum(i) FROM (SELECT 2 AS i WHERE 1 <> 1)";
let result: Option<i64> = db.query_row(no_result, &[], |r| r.get(0))
.unwrap();
assert!(result.is_none());
let single_sum = "SELECT my_sum(i) FROM (SELECT 2 AS i UNION ALL SELECT 2)";
let result: i64 = db.query_row(single_sum, &[], |r| r.get(0))
.unwrap();
assert_eq!(4, result);
let single_sum = "SELECT my_sum(i), my_sum(j) FROM (SELECT 2 AS i, 1 AS j UNION ALL \
SELECT 2, 1)";
let result: (i64, i64) = db.query_row(single_sum, &[], |r| (r.get(0), r.get(1)))
.unwrap();
assert_eq!((4, 2), result);
}
}