forks
/
arsd
mirror of https://github.com/adamdruppe/arsd.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

fix(sqlite): improve floating-point precision 

This adds support for values of type double when binding values to a
query. Prior to this, doubles would be converted to a string and only
be stored with 6 digits of precision in the database.

Additionally, floats stored in the database were converted to strings
when retrieved and therefore be reduced to 6 digits of precision, too.
This commit is contained in:
konradh 2023-11-05 16:03:18 +01:00
parent 9aeed1c2c1
commit 08d072806c
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
sqlite.d
View File

@ -237,6 +237,9 @@ class SqliteResult : ResultSet {
foreach(c; rows[position]) {
if(auto t = c.peek!(immutable(byte)[]))
r.row ~= DatabaseDatum(cast(string) *t);
else if (auto d = c.peek!double)
// 17 significant decimal digits are enough to not lose precision (IEEE 754 section 5.12.2)
r.row ~= DatabaseDatum(format!"%.17s"(*d));
else
r.row ~= DatabaseDatum(c.coerce!(string));
}
@ -508,6 +511,7 @@ template extract(A, T, R...){
void bind (const char[] name, const char[] value){ bind(bindNameLookUp(name), value); }
void bind (const char[] name, int value){ bind(bindNameLookUp(name), value); }
void bind (const char[] name, float value){ bind(bindNameLookUp(name), value); }
void bind (const char[] name, double value){ bind(bindNameLookUp(name), value); }
void bind (const char[] name, const byte[] value){ bind(bindNameLookUp(name), value); }
void bind (const char[] name, const ubyte[] value){ bind(bindNameLookUp(name), value); }
@ -525,6 +529,11 @@ template extract(A, T, R...){
throw new DatabaseException("bind " ~ db.error());
}
void bind(int col, double value){
if(sqlite3_bind_double(s, col, value) != SQLITE_OK)
throw new DatabaseException("bind " ~ db.error());
}
void bind(int col, int value){
if(sqlite3_bind_int(s, col, value) != SQLITE_OK)
throw new DatabaseException("bind " ~ db.error());
@ -572,6 +581,8 @@ template extract(A, T, R...){
bind(col, v.get!string);
else if(v.peek!float)
bind(col, v.get!float);
else if(v.peek!double)
bind(col, v.get!double);
else if(v.peek!(byte[]))
bind(col, v.get!(byte[]));
else if(v.peek!(ubyte[]))