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Review comment: generalize from Uuid SQL arguments to byte arrays.

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This commit is contained in:
Richard Newman 2017-06-07 11:55:05 -07:00
parent ed04083ceb
commit 2c52346999
1 changed files with 10 additions and 12 deletions
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22
sql/src/lib.rs
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@ -24,7 +24,6 @@ use ordered_float::OrderedFloat;
use mentat_core::{
ToMicros,
TypedValue,
Uuid,
};
pub use rusqlite::types::Value;
@ -101,9 +100,9 @@ pub struct SQLiteQueryBuilder {
// We can't just use an InternSet on the rusqlite::types::Value instances, because that
// includes f64, so it's not Hash or Eq.
// Instead we track UUID and String arguments separately, mapping them to their argument name,
// Instead we track byte and String arguments separately, mapping them to their argument name,
// in order to dedupe. We'll add these to the regular argument vector later.
uuid_args: HashMap<Rc<Uuid>, String>, // From value to argument name.
byte_args: HashMap<Vec<u8>, String>, // From value to argument name.
string_args: HashMap<Rc<String>, String>, // From value to argument name.
args: Vec<(String, Rc<rusqlite::types::Value>)>, // (arg, value).
}
@ -119,7 +118,7 @@ impl SQLiteQueryBuilder {
arg_prefix: prefix,
arg_counter: 0,
uuid_args: HashMap::default(),
byte_args: HashMap::default(),
string_args: HashMap::default(),
args: vec![],
}
@ -166,12 +165,13 @@ impl QueryBuilder for SQLiteQueryBuilder {
self.push_sql(format!("{}", dt.to_micros()).as_str()); // TODO: argument instead?
},
&Uuid(ref u) => {
if let Some(arg) = self.uuid_args.get(u).cloned() { // Why, borrow checker, why?!
let bytes = u.as_bytes();
if let Some(arg) = self.byte_args.get(bytes.as_ref()).cloned() { // Why, borrow checker, why?!
self.push_named_arg(arg.as_str());
} else {
let arg = self.next_argument_name();
self.push_named_arg(arg.as_str());
self.uuid_args.insert(Rc::new(u.clone()), arg);
self.byte_args.insert(bytes.clone().to_vec(), arg);
}
},
// These are both `Rc`. Unfortunately, we can't use that fact when
@ -219,20 +219,18 @@ impl QueryBuilder for SQLiteQueryBuilder {
}
fn finish(self) -> SQLQuery {
// We collected string and UUID arguments into separate maps so that we could
// We collected string and byte arguments into separate maps so that we could
// dedupe them. Now we need to turn them into rusqlite Values.
let mut args = self.args;
let string_args = self.string_args.into_iter().map(|(val, arg)| {
(arg, Rc::new(rusqlite::types::Value::Text(val.as_ref().clone())))
});
let uuid_args = self.uuid_args.into_iter().map(|(val, arg)| {
// Get a byte array.
let bytes = val.as_bytes().clone();
(arg, Rc::new(rusqlite::types::Value::Blob(bytes.to_vec())))
let byte_args = self.byte_args.into_iter().map(|(val, arg)| {
(arg, Rc::new(rusqlite::types::Value::Blob(val)))
});
args.extend(string_args);
args.extend(uuid_args);
args.extend(byte_args);
// Get the args in the right order -- $v0, $v1…
args.sort_by(|&(ref k1, _), &(ref k2, _)| k1.cmp(k2));