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AdoNetCore.AseClient

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AdoNetCore.AseClient - a .NET Core DB Provider for SAP ASE

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# ![icon](https://raw.githubusercontent.com/DataAction/AdoNetCore.AseClient/master/icon.png "icon") AdoNetCore.AseClient

A .NET Core DB Provider for SAP ASE

[![CodeFactor](https://www.codefactor.io/repository/github/dataaction/adonetcore.aseclient/badge)](https://www.codefactor.io/repository/github/dataaction/adonetcore.aseclient)
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Packages available at NuGet:

| Name                                               | Version
| -------------------------------------------------- | -------
| `AdoNetCore.AseClient` (Recommended)               | [![AdoNetCore.AseClient@NuGet](https://img.shields.io/nuget/v/AdoNetCore.AseClient.svg)](https://www.nuget.org/packages/AdoNetCore.AseClient)
| `AdoNetCore.AseClient.StrongName` (Strongly Named) | [![AdoNetCore.AseClient.StrongName@NuGet](https://img.shields.io/nuget/v/AdoNetCore.AseClient.StrongName.svg)](https://www.nuget.org/packages/AdoNetCore.AseClient.StrongName)

SAP (formerly Sybase) has supported accessing the ASE database management system from ADO.NET for many years. Unfortunately SAP has not yet made a driver available to support .NET Core, so this project enables product teams that are dependent upon ASE to keep moving their application stack forwards.

The current .NET 4 version of SAP's `Sybase.Data.AseClient` driver is a .NET Framework managed wrapper around SAP's unmanged [ADO DB provider](https://en.wikipedia.org/wiki/ActiveX_Data_Objects) and is dependent upon [COM](https://en.wikipedia.org/wiki/Component_Object_Model). COM is a Windows-only technology and will never be available to .NET Core, making it difficult to port the existing SAP driver.

Under the hood, ASE (and Microsoft Sql Server for that matter) relies on an application-layer protocol called [Tabular Data Stream](https://en.wikipedia.org/wiki/Tabular_Data_Stream) to transfer data between the database server and the client application. ASE uses TDS 5.0.

This project provides a .NET Core native implementation of the TDS 5.0 protocol via an ADO.NET DB Provider, making SAP ASE accessible from .NET Core applications hosted on Windows, Linux, Docker and also serverless platforms like [AWS Lambda](https://aws.amazon.com/lambda/).

## Table of Contents
* [Downloads](#downloads)
* [Objectives](#objectives)
* [Performance benchmarks](#performance-benchmarks)
* [Connection strings](#connection-strings)
* [Supported types](#supported-types)
* [Code samples](#code-samples)

## Downloads
The latest stable release of the AdoNetCore.AseClient is [available on NuGet](https://www.nuget.org/packages/AdoNetCore.AseClient).

## Objectives
* Functional parity with the `Sybase.Data.AseClient` provided by SAP. Ideally, our driver will be a drop in replacement for the `Sybase.Data.AseClient` (with some namespace changes). The following types are supported:
    * AseClientFactory - .NET Core 2.1+
    * AseCommand
    * AseCommandBuilder
    * AseConnection
    * AseConnectionPool
    * AseConnectionPoolManager
    * AseDataAdapter
    * AseDataReader
    * AseDbType
    * AseDecimal
    * AseError
    * AseErrorCollection
    * AseException
    * AseInfoMessageEventArgs
    * AseInfoMessageEventHandler
    * AseParameter
    * AseParameterCollection
    * AseRowUpdatedEventArgs - .NET Core 2.0+
    * AseRowUpdatedEventHandler - .NET Core 2.0+
    * AseRowUpdatingEventArgs - .NET Core 2.0+
    * AseRowUpdatingEventHandler - .NET Core 2.0+
    * TraceEnterEventHandler
    * TraceExitEventHandler

* Not all features are currently supported, and some features will not be supported. Refer to [Unsupported features](https://github.com/DataAction/AdoNetCore.AseClient/wiki/Unsupported-features).
* Performance equivalent to or better than that of `Sybase.Data.AseClient` provided by SAP. This is possible as we are eliminating the COM and OLE DB layers from this driver and .NET Core is fast.
* Target all versions of .NET Core (1.0, 1.1, 2.0, 2.1 and 2.2)
* Should work with [Dapper](https://github.com/StackExchange/Dapper) at least as well as the `Sybase.Data.AseClient`

## Performance benchmarks

### Test methodology
To help adopt the `AdoNetCore.AseClient`, we have benchmarked it against the `Sybase.Data.AseClient`. See the wiki for how to [run the benchmarks yourself](https://github.com/DataAction/AdoNetCore.AseClient/wiki/Running-the-benchmarks).

We have benchmarked the `AdoNetCore.AseClient` against the `Sybase.Data.AseClient` in the following ways:

#### Single read, without pooling
Open a connection (unpooled) and invoke AseCommand.ExecuteReader(...) once and read back one row of data.

#### Single read, with pooling
Open a connection (pooled) and invoke AseCommand.ExecuteReader(...) once and read back one row of data.

#### Multiple reads, without pooling
Open a connection (unpooled) and invoke AseCommand.ExecuteReader(...) once and read back 12 rows of data.

#### Multiple reads, with pooling
Open a connection (pooled) and invoke AseCommand.ExecuteReader(...) once and read back 12 rows of data.

#### Multiple reads, multiple times, without pooling
Open a connection (unpooled) and invoke AseCommand.ExecuteReader(...) 9 times, and read back 11-12 rows of data each time.

#### Multiple reads, multiple times, with pooling
Open a connection (pooled) and invoke AseCommand.ExecuteReader(...) 9 times, and read back 11-12 rows of data each time.

#### Multiple reads, multiple writes, without pooling
Open a connection (unpooled) and invoke AseCommand.ExecuteReader(...) once, reading back 56 rows of data. Prepare a new AseCommand and invoke AseCommand.ExecuteNonQuery(...) for each of the 56 rows to update the database.

#### Multiple reads, multiple writes, with pooling
Open a connection (pooled) and invoke AseCommand.ExecuteReader(...) once, reading back 56 rows of data. Prepare a new AseCommand and invoke AseCommand.ExecuteNonQuery(...) for each of the 56 rows to update the database.

We perform these tests for .NET Core 1.1, .NET Core 2.0, and .NET Standard 4.6 using the `AdoNetCore.AseClient`. For comparison, we also perform these tests on .NET Standard 4.6 using the `Sybase.Data.AseClient` from SAP.

### Environment
The goal of the benchmarking is not to establish the absolute performance of the driver or the ASE Server, but to show its equivalence as a substitute. As such, the test client and database server have been held constant in all tests.

#### Server:
Adaptive Server Enterprise/16.0 SP03 PL02/EBF 27413 SMP/P/AMD64/Windows 2008 R2 SP1/ase160sp03pl02x/0/64-bit/FBO/Fri Oct 06 14:34:03 2017

#### Client:
BenchmarkDotNet=v0.10.11, OS=Windows 10 Redstone 2 [1703, Creators Update] (10.0.15063.726)
Processor=Intel Core i7-6700 CPU 3.40GHz (Skylake), ProcessorCount=8
Frequency=3328123 Hz, Resolution=300.4697 ns, Timer=TSC
.NET Core SDK=2.1.3
  [Host]     : .NET Core 2.0.4 (Framework 4.6.25921.01), 64bit RyuJIT
  DefaultJob : .NET Core 2.0.4 (Framework 4.6.25921.01), 64bit RyuJIT

### Test results
In all of the test cases the `AdoNetCore.AseClient` performed better or equivalent to the `Sybase.Data.AseClient`.

![AdoNetCore.AseClient vs Sybase.Data.AseClient](https://raw.githubusercontent.com/DataAction/AdoNetCore.AseClient/master/benchmarks.png "AdoNetCore.AseClient vs Sybase.Data.AseClient")

## Connection strings
[connectionstrings.com](https://www.connectionstrings.com/sybase-adaptive/) lists the following connection string properties for the ASE ADO.NET Data Provider. In keeping with our objective of being a drop-in replacement for the `Sybase.Data.AseClient`, we aim to use identical connection string syntax to the `Sybase.Data.AseClient`, however our support for the various properties will be limited. Our support is as follows:

| Property                                                                                   | Support   | Notes
| ------------------------------------------------------------------------------------------ |:---------:| -----
| `AnsiNull`                                                                                 | &#10003; | By default (0) AnsiNull is disabled which means that SQL statements can use `= NULL` and `IS NULL` syntax. Set to 1 to instruct the connection to only permit `IS NULL` syntax.
| `ApplicationName` or `Application Name`                                                    | &#10003;
| `BufferCacheSize`                                                                          | &#10003; | Buffer caching is automatically managed via an internal [ArrayPool<T>](https://docs.microsoft.com/en-us/dotnet/api/system.buffers.arraypool-1.create?view=netstandard-2.1). Setting this value in the connection string does nothing, but the behaviour is supported.
| `Charset`                                                                                  | &#10003; | If not specified, the server should dictate the character set
| `ClientHostName`                                                                           | &#10003;
| `ClientHostProc`                                                                           | &#10003;
| `CodePageType`                                                                             | &#10005; | This doesn't appear to be relevant any more. You can specify the `Charset` without reference to a code page type, or allow the server to set the `Charset` which is the default behaviour.
| `Connection Lifetime` or `ConnectionLifetime`                                              | &#10003;
| `ConnectionIdleTimeout` or `Connection IdleTimeout` or `Connection Idle Timeout`           | &#10003;
| `CumulativeRecordCount`                                                                    | TODO
| `Database` or `Db` or `Initial Catalog`                                                    | &#10003;
| `Data Source` or `DataSource` or `Address` or `Addr` or `Network Address` or `Server Name` | &#10003;
| `DSURL` or `Directory Service URL`                                                         | &#10003; | Multiple URLs are not supported; network drivers other than NLWNSCK (TCP/IP socket) are not supported; LDAP is not supported
| `EnableServerPacketSize`                                                                   | &#10003;
| `Encryption`                                                                               | &#10003; | The designated encryption. Possible values: ssl, none.
| `EncryptPassword`                                                                          | &#10003; | Values 0 (disabled) and 1 (enabled) are supported. The highest encryption standard of the ASE 15.x and 16x servers is implemented.
| `LoginTimeOut` or `Connect Timeout` or `Connection Timeout`                                | &#10003; | For pooled connections this translates to the time it takes to reserve a connection from the pool
| `Max Pool Size`                                                                            | &#10003;
| `Min Pool Size`                                                                            | &#10003; | <ul><li>The pool will attempt to prime itself on creation up to this size (in a thread)</li><li>When a connection is killed, the pool will attempt to replace it if the pool size is less than Min</li></ul>
| `NamedParameters`                                                                          | &#10003;
| `PacketSize` or `Packet Size`                        |                                      &#10003; | The server can decide to change this value
| `Ping Server`                                                                              | &#10003;
| `Pooling`                                                                                  | &#10003;
| `Port` or `Server Port`                                                                    | &#10003;
| `Pwd` or `Password`                                                                        | &#10003;
| `TextSize`                                                                                 | &#10003;
| `TrustedFile`                                                                              | &#10003; | This property must be used along with `Encryption=ssl`. The value must be set to the path to the trusted file.
| `Uid` or `UserID` or `User ID` or `User`                                                   | &#10003;
| `UseAseDecimal`                                                                            | &#10003;

## Supported types
### Types supported when sending requests to the database

| DbType                  | Send      | .NET Type(s) | Notes
| ----------------------- |:---------:| ------------ | -----
| `AnsiString`            | &#10003;  | `string`
| `AnsiStringFixedLength` | &#10003;  | `string`
| `Binary`                | &#10003;  | `byte[]`
| `Boolean`               | &#10003;  | `bool`
| `Byte`                  | &#10003;  | `byte`
| `Currency`              | &#10003;  | `decimal` | Sent as decimal type; may change to send as `TDS_MONEY`, which is shorter
| `Date`                  | &#10003;  | `DateTime` | Time component is ignored
| `DateTime`              | &#10003;  | `DateTime`
| `DateTime2`             | X         | | ASE does not support a `DateTime2` type. Use `DateTime` instead
| `DateTimeOffset`        | X         | | ASE does not support a `DateTimeOffset` type. Use `DateTime` instead
| `Decimal`               | &#10003;  | `decimal`
| `Double`                | &#10003;  | `double`
| `Guid`                  | &#10003;  | `System.Guid` | Technically ASE does not support GUID or UUID types. Our driver supports it, but converts to `Binary` under the hood. You can obtain the same result by calling `.ToByteArray()` and using `DbType.Binary`.
| `Int16`                 | &#10003;  | `short`
| `Int32`                 | &#10003;  | `int`
| `Int64`                 | &#10003;  | `long`
| `Object`                | X         | | ASE does not support an `Object` type
| `SByte`                 | &#10003;  | `sbyte` | Sent as int16
| `Single`                | &#10003;  | `float`
| `String`                | &#10003;  | `string` | UTF-16 encoded, sent to server as binary with usertype `35`
| `StringFixedLength`     | &#10003;  | `string` | UTF-16 encoded, sent to server as binary with usertype `34`
| `Time`                  | &#10003;  | `TimeSpan`
| `UInt16`                | &#10003;  | `ushort`
| `UInt32`                | &#10003;  | `uint`
| `UInt64`                | &#10003;  | `ulong`
| `VarNumeric`            | &#10003;  | `decimal`
| `Xml`                   | X         | | ASE does not support an `Xml` type

### Types supported when reading responses from the database

| ASE Type            | Receive   | .NET Type(s) | Notes
| ------------------- |:---------:| ------------ | -----
| `bigdatetime`       | X         | `DateTime` | To be implemented. `TDS_BIGDATETIME = 0xBB`
| `bigint`            | &#10003;  | `long`
| `bigtime`           | X         | `DateTime` | To be implemented. `TDS_BIGTIME = 0xBC`
| `binary`            | &#10003;  | `byte[]`
| `bit`               | &#10003;  | `bool`
| `char`              | &#10003;  | `string`
| `date`              | &#10003;  | `DateTime`
| `datetime`          | &#10003;  | `DateTime`
| `decimal`           | &#10003;  | `decimal`
| `double precision`  | &#10003;  | `double`
| `float`             | &#10003;  | `float`
| `image`             | &#10003;  | `byte[]`
| `int`               | &#10003;  | `int`
| `money`             | &#10003;  | `decimal`
| `nchar`             | &#10003;  | `string`
| `numeric`           | &#10003;  | `decimal`
| `nvarchar`          | &#10003;  | `string`
| `smalldatetime`     | &#10003;  | `DateTime`
| `smallint`          | &#10003;  | `short`
| `smallmoney`        | &#10003;  | `decimal`
| `time`              | &#10003;  | `DateTime` | We have added a `GetTimeSpan` method to `AseDataReader`
| `tinyint`           | &#10003;  | `byte`
| `unichar`           | &#10003;  | `string` | Server sends as binary with usertype `34`
| `univarchar`        | &#10003;  | `string` | Server sends as binary with usertype `35`
| `unsigned bigint`   | &#10003;  | `ulong`
| `unsigned int`      | &#10003;  | `uint`
| `unsigned smallint` | &#10003;  | `usmallint`
| `varchar`           | &#10003;  | `string`
| `text`              | &#10003;  | `string`
| `unitext`           | &#10003;  | `string`
| `varbinary`         | &#10003;  | `byte[]`

## Code samples
### Open a database connection
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using(var connection = new AseConnection(connectionString))
{
    connection.Open();

// use the connection...
}
```

### Execute a SQL statement and read response data
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "SELECT FirstName, LastName FROM Customer";

using (var reader = command.ExecuteReader())
        {
            // Get the results.
            while (reader.Read())
            {
                var firstName = reader.GetString(0);
                var lastName = reader.GetString(1);

// Do something with the data...
            }
        }
    }
}
```

### Execute a SQL statement that returns no results
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "INSERT INTO Customer (FirstName, LastName) VALUES ('Fred', 'Flintstone')";

var recordsModified = command.ExecuteNonQuery();
    }
}
```

### Execute a SQL statement that returns a scalar value
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "SELECT COUNT(*) FROM Customer";

var result = command.ExecuteScalar();
    }
}
```

### Use input parameters with a SQL query
Note: ASE only allows `Output`, `InputOutput`, and `ReturnValue` parameters with stored procedures
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString)
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "SELECT TOP 1 FirstName FROM Customer WHERE LastName = @lastName";

command.Parameters.AddWithValue("@lastName", "Rubble");

var result = command.ExecuteScalar();
    }
}
```

### Execute a stored procedure and read response data
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString)
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "GetCustomer";
        command.CommandType = CommandType.StoredProcedure;

command.Parameters.AddWithValue("@lastName", "Rubble");

// Do something with the data...
            }
        }
    }
}
```

### Execute a stored procedure that returns no results
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "CreateCustomer";
        command.CommandType = CommandType.StoredProcedure;

command.Parameters.AddWithValue("@firstName", "Fred");
        command.Parameters.AddWithValue("@lastName", "Flintstone");

command.ExecuteNonQuery();
    }
}
```

### Execute a stored procedure that returns a scalar value
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "CountCustomer";
        command.CommandType = CommandType.StoredProcedure;

var result = command.ExecuteScalar();
    }
}
```

### Use input, output, and return parameters with a stored procedure
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

using (var command = connection.CreateCommand())
    {
        command.CommandText = "GetCustomerFirstName";
        command.CommandType = CommandType.StoredProcedure;

command.Parameters.AddWithValue("@lastName", "Rubble");

var outputParameter = command.Parameters.Add("@firstName", AseDbType.VarChar);
        outputParameter.Direction = ParameterDirection.Output;

var returnParameter = command.Parameters.Add("@returnValue", AseDbType.Integer);
        returnParameter.Direction = ParameterDirection.ReturnValue;

command.ExecuteNonQuery();

//Do something with outputParameter.Value and returnParameter.Value...
    }
}
```

### Execute a stored procedure and read response data with [Dapper](https://github.com/StackExchange/Dapper)
```C#
var connectionString = "Data Source=myASEserver;Port=5000;Database=myDataBase;Uid=myUsername;Pwd=myPassword;";

using (var connection = new AseConnection(connectionString))
{
    connection.Open();

var barneyRubble = connection.Query<Customer>("GetCustomer", new {lastName = "Rubble"}, commandType: CommandType.StoredProcedure).First();

// Do something with the result...
}
```

AdoNetCore.AseClient

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