Ensure decimal point in decimal parameters

[bricelam]

This prevents integer results when performing arithmetic operations on decimal parameters. For example, consider the following query.

SELECT 1 / $value;

Where value is the following in C#.

decimal value = 2m;

Here is a table illustrating the improved result.

Microsoft.Data.Sqlite	Result
1.x	0
2.0.0	0.5

Breaking change

You may encounter a breaking change if you previously saved integral decimal values into a column using version 1.x and try to query for equality in version 2.0.0.

For example, if you previously saved the value 3m into DecimalColumn and try the following query in version 2.0 (where $value is also 3m) it will return no results.

SELECT *
FROM MyTable
WHERE DecimalColumn = $value;
--              '3' = '3.0'   (False)

To upgrade your database to be fully compatible with decimal parameters in version 2.0.0, you'll need to use UPDATE statements like the following.

UPDATE MyTable
SET DecimalColumn = DecimalColumn + '.0'
WHERE instr(DecimalColumn, '.') = 0;

Note, reading decimal columns with SqliteDataReader will yield the same values as before. It's only SQL equality comparisons that are affected.

[smitpatel]

Hopefully it has exact number of #

[bricelam]

I double-checked everything. It's the same precision as before, just with a guaranteed decimal place.