SqlFu is a flexibile data mapper (aka micro-ORM) for .Net Core 3 Apache 2.0 license.
Latest version: 5.0.0
It's important to understand that SqlFu is NOT a (light) ORM. While an ORM abstracts sql and gives us the illusion of working with a 'object database', SqlFu maps data from a query result to a POCO and provides helpers which use POCOs as a data source. Simply put, an object in SqlFu is a data source or destination. There are no relational table to object and back mappings that magically generate sql.
The strongly typed helpers or sql builders are just that: a specialised string builder which uses expressions, there is no Linq involved. In SqlFu we think Sql but we write it mostly in C#. Think of SqlFu as a powerful facade for Ado.Net.
Usually we use a POCO (a defined or anonymous type) to represent a table or a view. SqlFu helpers are flexible enough for most one table queries, but if you need to join tables, you should either write the sql as string (not really recommended) or create a db view (recommended) or a stored procedure.
SqlFu is designed to be used in a cloud environment and it works great inside DDD/CQRS apps or simple CRUD apps.
Please create your pull requests to target the "v4-devel" branch. "Master" is only for released code. Thank you.
//quick query using the default connection
var name=SqlFuManager.QueryOver<MyObject>().Select(d => d.FirstName,criteria: d => d.FirstName == "John").GetValue();
//quick update
//"schema.table" is implicit converted to `TableName` instance
_db.UpdateFrom(new {Name="Foo"},"myTable").Where(new{Id=2}).Execute();
LogManager.OutputToTrace();
SqlFuManager.Configure(c =>
{
//add the default profile (name is 'default')
c.AddProfile(new SqlServer2012Provider(SqlClientFactory.Instance.CreateConnection),cnx_string);
//add named profile
c.AddProfile(new SqlServer2012Provider(SqlClientFactory.Instance.CreateConnection),cnx_string,"other");
//register a type converter for query purposes, obj -> Email
c.RegisterConverter(val=>new Email(val.ToString()));
//register a custom (manual) mapper
c.CustomMappers.Register(reader=> new MyPoco(){ /* init from DbDataReader */});
//set the table name to be used when dealing with this POCO.
c.ConfigureTableForPoco<MyPoco>(info=>
{
info.Table=new TableName("my_pocos");
//new in ver. 4.0.0 - additional info used by helpers
//Any table name used by helpers will use it by default
c.SetDefaultDbSchema("foo");
//the Insert helper uses it to return inserted id
d.Property(f => f.Id).IsAutoincremented();
//properties will be always be ignored
d.IgnoreProperties(f=>f.Ignored);
//use it when you want to convert value just before writing to the db
// store an enum as a string instead of the default int
d.Property(f => f.Category)
.BeforeWritingUseConverter(t => t.ToString())
//the column name in the db is 'Categ'
.MapToColumn("Categ");
}
);
//register a naming convention
c.AddNamingConvention(predicate,type=> new TableName(type.Fullname));
//used a predefined convention. PostsItem is considered to 'represent' the table/view "Posts"
c.AddSuffixTableConvention(suffix:"Item");
//custom logging
c.OnException = (cmd,ex)=> Logger.Error(cmd.FormatCommand(),ex);
});
Notes
Most of the time you'll need to inject a db connection factory into your Repository/DAO/Query object . It's always better to do that instead of injecting a DbConnection. IDbFactory is the predefined factory abstraction in SqlFu.
public class MyRepository
{
public MyRepository(IDbFactory getDb){}
public void DoStuff()
{
using(var db=_getDb.Create())
{
//use db connection
}
}
}
//gets factory for the default profile
var factory=SqlFuManager.GetDbFactory();
//get a specific profile
var factory=SqlFuManager.GetDbFactory("other");
var repo=new MyRepository(factory); Working with multiple databases/providers
Let's assume I need 2 connections in my app: one for db "Main", other for db "History". First we we declare specific interfaces that will be used by the objects which need db access, then add the profiles for each db. SqlFu automatically generates concrete classes deriving from DbFactory and implementing the interfaces. All factories are singletons.
public interface IMainDb:IDbFactory
{
}
public interface IHistoryDb:IDbFactory
{
}
//register the db profiles
SqlFuManager.Configure(c =>
{
//default profile
c.AddProfile<IMainDB>(new SqlServer2012Provider(SqlClientFactory.Instance.CreateConnection),MainConnex);
//history profile
c.AddProfile<IHistoryDb>(new SqlServer2012Provider(SqlClientFactory.Instance.CreateConnection),HistoryConnex,"history");
});
//get main db factory singleton
var main= SqlFuManager.GetDbFactory<IMainDb>();
//get history db singleton
var history=SqlFuManager.GetDbFactory<IHistoryDb>();
//register into DI Container to be injected in a service
//autofac
var cb=new ContainerBuilder();
cb.Register(c=>main).As<IMainDb>().SingleInstance();
cb.Register(c=>history).As<IHistoryDb>().SingleInstance();
//uses both main db and history db
public class MyService
{
public MyService(IMainDb db,IHistoryDb) {}
} Transient Errors Resilience
It's a common scenario, especially using a cloud based db like Azure Sql, to reach connections limit or the opening of a connection to timeout. SqlFu automatically employs a simple strategy to retry the operation a number of times. You can configure it like this:
SqlFuManager.Configure(c=>
{
//other options are available too
c.ConfigureDefaultTransientResilience(f=>f.MaxRetries=5);
//if you want to implement your own strategy, you need to create a class implementing `IRetryOnTransientErrorsStrategy`
c.TransientErrorsStrategyFactory=()=>new MyStrategy();
});
Almost all helpers have async counterparts
DbConnection _db=dbFactory.Create();
//insert
_db.Insert(new User()
{
FirstName = "John",
LastName = "Doe"
});
//optional, specify what column is PK
c.ConfigureTableForPoco<MyPoco>(info=>
{
//the Insert helper uses it to return inserted id
d.Property(f => f.Id).IsAutoincremented();
}
//insert with options
_db.Insert(new
{
FirstName = "John",
LastName = "Doe",
Bla=0
}, cf =>
{
cf.SetTableName("mytable");
c.IdentityColumn = "Id";
cf.Ignore(d=>d.Bla);
});
//Ignores unique key constraints. Useful when updating read models
_db.InsertIgnore(new User()
{
FirstName = "John",
LastName = "Doe"
});
//update
_db.Update<User>()
.Set(c=>c.FirstName,"John").Set(c=>c.Posts,c.Posts+1)
.Where(c=>c.Id==userId)
.Execute();
//update from anonymous
_db.UpdateFrom(
q => q.Data(new { Firstname = "John3", Id = 3 }).Ignore(d => d.Id)
,o => o.SetTableName("users")
)
.Where(d => d.Firstname == "John")
.Execute();
//delete
_db.DeleteFrom<User>(d=>d.Id==id);
_db.DeleteFromAnonymous(
new {Category = ""}
, opt => opt.SetTableName("users")
, d => d.Category == Type.Page.ToString());
SqlFu features a quite powerful and flexible query builder that you can use to query one table/view (use views or sprocs when you need joins). Note that it can be useful or a big PITA, in doubt go for the simplest thing.
//alternative syntax
_db.WithSql(q => q.From<User>()
.Where(d=>d.Id==id && !d.IsActive)
.OrderByIf(c=>input.ShouldSort,d=>d.Name)
.SelectAll())
.GetRows();
//you can use pocos to create the sql but map the result to a different poco
_db.QueryAs(q => q.From<User>().SelectAll().MapTo<OtherPoco>());
//returns one row only
_db.QueryRow(q=>q.From<User>().SelectAll());
_db.WithSql(q=>q.From<User>().SelectAll()).GetFirstRow();
//returns one value
_db.QueryValue(q=>q.From<User>().Select(d=>d.Id));
_db.WithSql(q=>q.From<User>().Select(d=>d.Id)).GetValue();
//returns a List<int>
_db.QueryAs(q=>q.From<User>().Select(d=>d.Id));
//process a result set row by row. Useful when dealing with a big result set
_db.QueryAndProcess(q=>q.From<User>().SelectAll(),user=>{
user.Name=user.Name.ToUpper();
return true;//continue processing
return false;//query ends here, no other results are read/mapped
});
_db.WithSql((q=>q.From<User>().SelectAll())
.ProcessEachRow(user=>{
user.Name=user.Name.ToUpper();
return true;//continue processing
return false;//query ends here, no other results are read/mapped
}).Execute();
//query using interpolated strings . Variables are converted into query params
_db.SqlTo<User>($"select * from users where id ={id}").GetRows();
_db.SqlTo<User>(q=>q.Append("select * from users").AppendIf(d=>id>0,$" where id={id}")).GetRows()
//do a paged query, useful for pagination. Here we request page 2 with 30 results per page
var result=_db.QueryPaged<User>(q=>q.From<User>.SelectAll(),new Pagination(page:2,pageSize:30));
//total existing users
result.Count
//result set with 30 users
result.Items
//execute some sql
_db.Execute($"delete from {_db.GetTableName<User>()} where Id=@0",userId);
Notes
Query uses the strongly typed sql builder.HasValueIn is for column in (values) sql.Contains(column) to generate column in (values) sql;Select is about specifying the sql column and an implicit mapping to the projection, however MapTo applies after the sql has been built and the query executed.//execute a sproc
var result = _db.ExecuteSProc(s =>
{
s.ProcName = "spTest";
s.Arguments = new { id = 47, _pout = "" };
});
result.ReturnValue.Should().Be(100);
string pout = r.OutputValues.pout;
//execute a sproc which returns a result set
var res = _db.QuerySProc<MyPoco>("spTest", new { id = 46, _pout = "" });
res.ReturnValue.Should().Be(100);
//do something with the result set List<MyPoco>
return r.Result;
Notes
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