private static TResult ExecuteComplex <TResult>(
ImpatientQueryProvider queryProvider,
Action <DbCommand> commandBuilder,
Func <DbDataReader, TResult> materializer)
{
using (var connection = queryProvider.ConnectionFactory.CreateConnection())
using (var command = connection.CreateCommand())
{
commandBuilder(command);
queryProvider.DbCommandInterceptor?.Invoke(command);
connection.Open();
using (var reader = command.ExecuteReader(CommandBehavior.CloseConnection))
{
// TODO: Can the logic really be this simple?
// - Related to 'DefaultIfEmpty' and '___OrDefault' behavior
// - Currently relying on the queries themselves to supply:
// - The default value, through the materializer
// - Exceptions for First/Single/SingleOrDefault/Last/ElementAt
reader.Read();
return(materializer(reader));
}
}
}
static NullableMemberTests()
{
var impatient
= new ImpatientQueryProvider(
new TestImpatientConnectionFactory(
@"Server=.\sqlexpress; Database=NORTHWND; Trusted_Connection=True"),
new DefaultImpatientQueryCache(),
new DefaultImpatientExpressionVisitorProvider());
context = new NorthwindQueryContext(impatient);
}
public NorthwindQueryContext(ImpatientQueryProvider impatient)
{
this.impatient = impatient;
impatient.DbCommandInterceptor = command =>
{
if (commandLog.Length > 0)
{
commandLog.AppendLine().AppendLine();
}
commandLog.Append(command.CommandText);
};
}
private static TResult ExecuteScalar <TResult>(
ImpatientQueryProvider queryProvider,
Action <DbCommand> commandBuilder)
{
using (var connection = queryProvider.ConnectionFactory.CreateConnection())
using (var command = connection.CreateCommand())
{
commandBuilder(command);
queryProvider.DbCommandInterceptor?.Invoke(command);
connection.Open();
return((TResult)command.ExecuteScalar());
}
}
private static IEnumerable <TElement> ExecuteEnumerable <TElement>(
ImpatientQueryProvider queryProvider,
Action <DbCommand> commandBuilder,
Func <DbDataReader, TElement> materializer)
{
using (var connection = queryProvider.ConnectionFactory.CreateConnection())
using (var command = connection.CreateCommand())
{
commandBuilder(command);
queryProvider.DbCommandInterceptor?.Invoke(command);
connection.Open();
using (var reader = command.ExecuteReader(CommandBehavior.CloseConnection))
{
while (reader.Read())
{
yield return(materializer(reader));
}
}
}
}
public ImpatientQueryable(Expression expression, ImpatientQueryProvider provider)
{
Expression = expression ?? throw new ArgumentNullException(nameof(expression));
Provider = provider ?? throw new ArgumentNullException(nameof(provider));
}
public NorthwindQueryContext(ImpatientQueryProvider impatient, TestDbCommandExecutorFactory executor)
{
this.impatient = impatient;
this.executor = executor;
}
public QueryActivatingExpressionVisitor(ImpatientQueryProvider provider)
{
this.provider = provider;
}
public TablePerTypeInheritanceTests()
{
impatient = new ImpatientQueryProvider(
new TestImpatientConnectionFactory(@"Server=.\sqlexpress; Database=tempdb; Trusted_Connection=true"),
new DefaultImpatientQueryCache(),
new DefaultImpatientExpressionVisitorProvider())
{
DbCommandInterceptor = command =>
{
if (commandLog.Length > 0)
{
commandLog.AppendLine().AppendLine();
}
commandLog.Append(command.CommandText);
}
};
using (var connection = impatient.ConnectionFactory.CreateConnection())
{
connection.Execute(@"
DROP TABLE IF EXISTS DerivedConcreteType3;
DROP TABLE IF EXISTS DerivedConcreteType2;
DROP TABLE IF EXISTS DerivedConcreteType1;
DROP TABLE IF EXISTS DerivedAbstractType1;
DROP TABLE IF EXISTS BaseAbstractType1;
CREATE TABLE BaseAbstractType1
(
[Id] int not null primary key,
[Property_BaseAbstractType1] nvarchar(max) null
);
CREATE TABLE DerivedAbstractType1
(
[Id] int not null primary key,
[Property_DerivedAbstractType1] nvarchar(max) null,
CONSTRAINT FK_DerivedAbstractType1_BaseAbstractType1
FOREIGN KEY (Id) REFERENCES BaseAbstractType1 (Id)
);
CREATE TABLE DerivedConcreteType1
(
[Id] int not null primary key,
[Property_DerivedConcreteType1] nvarchar(max) null,
CONSTRAINT FK_DerivedConcreteType1_BaseAbstractType1
FOREIGN KEY (Id) REFERENCES BaseAbstractType1 (Id)
);
CREATE TABLE DerivedConcreteType2
(
[Id] int not null primary key,
[Property_DerivedConcreteType2] nvarchar(max) null,
CONSTRAINT FK_DerivedConcreteType2_DerivedAbstractType1
FOREIGN KEY (Id) REFERENCES DerivedAbstractType1 (Id)
);
CREATE TABLE DerivedConcreteType3
(
[Id] int not null primary key,
[Property_DerivedConcreteType3] nvarchar(max) null,
CONSTRAINT FK_DerivedConcreteType3_DerivedAbstractType1
FOREIGN KEY (Id) REFERENCES DerivedAbstractType1 (Id)
);
INSERT INTO BaseAbstractType1 (Id, Property_BaseAbstractType1)
VALUES
(1, 'a'),
(2, 'b'),
(3, 'c'),
(4, 'a'),
(5, 'b'),
(6, 'c'),
(7, 'a'),
(8, 'b'),
(9, 'c');
INSERT INTO DerivedAbstractType1 (Id, Property_DerivedAbstractType1)
VALUES
(4, 'a'),
(5, 'b'),
(6, 'c'),
(7, 'a'),
(8, 'b'),
(9, 'c');
INSERT INTO DerivedConcreteType1(Id, Property_DerivedConcreteType1)
VALUES
(1, 'a'),
(2, 'b'),
(3, 'c');
INSERT INTO DerivedConcreteType2(Id, Property_DerivedConcreteType2)
VALUES
(4, 'a'),
(5, 'b'),
(6, 'c');
INSERT INTO DerivedConcreteType3(Id, Property_DerivedConcreteType3)
VALUES
(7, 'a'),
(8, 'b'),
(9, 'c');
");
}
}