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Merge pull request #43 from koenbeuk/issue-40

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Update README.md
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Koen
2022-10-12 10:06:51 +01:00
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@@ -131,6 +131,34 @@ This will rewrite your expression to explicitly check for nullables. In the form
```
Note that using rewrite (not ignore) may increase the actual SQL query complexity being generated with some database providers such as SQL Server
#### Can I use projectables in any part of my query?
Certainly, consider the following example:
```csharp
public class User
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
[Projectable]
public string FullName => FirstName + " " + LastName;
}
var query = dbContext.Users
.Where(x => x.FullName.Contains("Jon"))
.GroupBy(x => x.FullName)
.OrderBy(x => x.Key)
.Select(x => x.Key);
```
Which generates the following SQL (SQLite syntax)
```sql
SELECT (COALESCE("u"."FirstName", '') || ' ') || COALESCE("u"."LastName", '')
FROM "Users" AS "u"
WHERE ('Jon' = '') OR (instr((COALESCE("u"."FirstName", '') || ' ') || COALESCE("u"."LastName", ''), 'Jon') > 0)
GROUP BY (COALESCE("u"."FirstName", '') || ' ') || COALESCE("u"."LastName", '')
ORDER BY (COALESCE("u"."FirstName", '') || ' ') || COALESCE("u"."LastName", '')
```
#### How does this relate to [Expressionify](https://github.com/ClaveConsulting/Expressionify)?
Expressionify is a project that was launched before this project. It has some overlapping features and uses similar approaches. When I first published this project, I was not aware of its existence so shame on me. Currently Expressionify targets a more focusses scope of what this project is doing and thereby it seems to be more limiting in its capabilities. Check them out though!