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electricessence
committed
5.9.0
Implemented correct transaction flow. Added extensions for creating commands from transactions. Expanded expressive commands to allow for transactions. Added examples.
1 parent 02341c3 commit 15f086f

27 files changed

+8560
-1522
lines changed

‎Examples/Examples.csproj‎

Lines changed: 11 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,11 @@
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>netstandard2.0</TargetFramework>
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</PropertyGroup>
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7+
<ItemGroup>
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<ProjectReference Include="..\Open.Database.Extensions.csproj" />
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</ItemGroup>
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</Project>

‎Examples/Transaction.cs‎

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@@ -0,0 +1,30 @@
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using Open.Database.Extensions;
2+
using System.Data.SqlClient;
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4+
public static partial class Examples
5+
{
6+
public readonly static DbConnectionFactory ConnectionFactory
7+
= new DbConnectionFactory(()=>new SqlConnection());
8+
9+
// Returns true if the transaction is successful.
10+
public static bool TryTransaction()
11+
=> ConnectionFactory.Using(connection =>
12+
// Open a connection and start a transaction.
13+
connection.ExecuteTransactionConditional(transaction => {
14+
15+
// First procedure does some updates.
16+
var count = transaction
17+
.StoredProcedure("[Updated Procedure]")
18+
.ExecuteNonQuery();
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20+
// Second procedure validates the results.
21+
// If it returns true, then the transaction is commited.
22+
// If it returns false, then the transaction is rolled back.
23+
return transaction
24+
.StoredProcedure("[Validation Procedure]")
25+
.AddParam("@ExpectedCount", count)
26+
.ExecuteScalar<bool>();
27+
}));
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}
30+

‎ExpressiveCommandBase.cs‎

Lines changed: 45 additions & 34 deletions
Original file line numberDiff line numberDiff line change
@@ -31,14 +31,19 @@ public abstract partial class ExpressiveCommandBase<TConnection, TCommand, TDbTy
3131
/// </summary>
3232
protected readonly TConnection Connection;
3333

34+
/// <summary>
35+
/// The transaction to execute commands on if not using a connection factory.
36+
/// </summary>
37+
protected readonly IDbTransaction Transaction;
38+
3439
ExpressiveCommandBase(
3540
CommandType type,
3641
string command,
37-
List<Param> @params = null)
42+
IEnumerable<Param> @params)
3843
{
3944
Type = type;
4045
Command = command ?? throw new ArgumentNullException(nameof(command));
41-
Params = @params ?? throw new ArgumentNullException(nameof(@params));
46+
Params = @params?.ToList() ?? new List<Param>();
4247
Timeout = CommandTimeout.DEFAULT_SECONDS;
4348
}
4449

@@ -50,25 +55,28 @@ protected ExpressiveCommandBase(
5055
IDbConnectionFactory<TConnection> connFactory,
5156
CommandType type,
5257
string command,
53-
List<Param> @params)
54-
: this(type, command, @params ?? new List<Param>())
58+
IEnumerable<Param> @params)
59+
: this(type, command, @params)
5560
{
5661
ConnectionFactory = connFactory ?? throw new ArgumentNullException(nameof(connFactory));
5762
}
5863

59-
/// <param name="connection">The connection to execute the command on.</param>
60-
/// <param name="type">The command type>.</param>
61-
/// <param name="command">The SQL command.</param>
62-
/// <param name="params">The list of params</param>
63-
protected ExpressiveCommandBase(
64+
/// <param name="connection">The connection to execute the command on.</param>
65+
/// <param name="transaction">The optional transaction to execute the command on.</param>
66+
/// <param name="type">The command type>.</param>
67+
/// <param name="command">The SQL command.</param>
68+
/// <param name="params">The list of params</param>
69+
protected ExpressiveCommandBase(
6470
TConnection connection,
71+
IDbTransaction transaction,
6572
CommandType type,
6673
string command,
67-
List<Param> @params)
68-
: this(type, command, @params ?? new List<Param>())
74+
IEnumerable<Param> @params)
75+
: this(type, command, @params)
6976
{
7077
Connection = connection ?? throw new ArgumentNullException(nameof(connection));
71-
}
78+
Transaction = transaction;
79+
}
7280

7381
/// <summary>
7482
/// The command text or procedure name to use.
@@ -252,36 +260,36 @@ public TThis SetTimeout(ushort seconds)
252260
/// Handles providing the connection for use with the command.
253261
/// </summary>
254262
/// <param name="action">The handler for use with the connection.</param>
255-
protected void UsingConnection(Action<TConnection> action)
263+
protected void UsingConnection(Action<TConnection, IDbTransaction> action)
256264
{
257-
if (ConnectionFactory != null)
258-
{
259-
using (var conn = ConnectionFactory.Create())
260-
{
261-
action(conn);
262-
}
263-
}
264-
else
265-
{
266-
action(Connection);
267-
}
268-
}
265+
if (Connection != null)
266+
{
267+
action(Connection, Transaction);
268+
}
269+
else
270+
{
271+
using (var conn = ConnectionFactory.Create())
272+
{
273+
action(conn, null);
274+
}
275+
}
276+
}
269277

270278
/// <summary>
271279
/// Handles providing the connection for use with the command.
272280
/// </summary>
273281
/// <param name="action">The handler for use with the connection.</param>
274-
protected T UsingConnection<T>(Func<TConnection, T> action)
282+
protected T UsingConnection<T>(Func<TConnection, IDbTransaction, T> action)
275283
{
276284
if (Connection != null)
277285
{
278-
return action(Connection);
286+
return action(Connection, Transaction);
279287
}
280288
else
281289
{
282290
using (var conn = ConnectionFactory.Create())
283291
{
284-
return action(conn);
292+
return action(conn, null);
285293
}
286294
}
287295
}
@@ -291,13 +299,14 @@ protected T UsingConnection<T>(Func<TConnection, T> action)
291299
/// </summary>
292300
/// <param name="handler">The handler function for each IDataRecord.</param>
293301
public void Execute(Action<TCommand> handler)
294-
=> UsingConnection(con =>
302+
=> UsingConnection((con,t) =>
295303
{
296304
using (var cmd = con.CreateCommand(Type, Command, Timeout))
297305
{
298306
var c = cmd as TCommand;
299307
if (c == null) throw new InvalidCastException($"Actual command type ({cmd.GetType()}) is not compatible with expected command type ({typeof(TCommand)}).");
300-
AddParams(c);
308+
if (t != null) c.Transaction = t;
309+
AddParams(c);
301310
con.EnsureOpen();
302311
handler(c);
303312
}
@@ -311,13 +320,14 @@ public void Execute(Action<TCommand> handler)
311320
/// <param name="transform">The transform function for each IDataRecord.</param>
312321
/// <returns>The result of the transform.</returns>
313322
public T Execute<T>(Func<TCommand, T> transform)
314-
=> UsingConnection(con =>
323+
=> UsingConnection((con,t) =>
315324
{
316325
using (var cmd = con.CreateCommand(Type, Command, Timeout))
317326
{
318327
var c = cmd as TCommand;
319328
if (c == null) throw new InvalidCastException($"Actual command type ({cmd.GetType()}) is not compatible with expected command type ({typeof(TCommand)}).");
320-
AddParams(c);
329+
if (t != null) c.Transaction = t;
330+
AddParams(c);
321331
con.EnsureOpen();
322332
return transform(c);
323333
}
@@ -329,13 +339,14 @@ public T Execute<T>(Func<TCommand, T> transform)
329339
/// </summary>
330340
/// <returns>The value from the return parameter.</returns>
331341
public object ExecuteReturn()
332-
=> UsingConnection(con =>
342+
=> UsingConnection((con,t) =>
333343
{
334344
using (var cmd = con.CreateCommand(Type, Command, Timeout))
335345
{
336346
var c = cmd as TCommand;
337347
if (c == null) throw new InvalidCastException($"Actual command type ({cmd.GetType()}) is not compatible with expected command type ({typeof(TCommand)}).");
338-
AddParams(c);
348+
if (t != null) c.Transaction = t;
349+
AddParams(c);
339350
var returnParameter = c.CreateParameter();
340351
returnParameter.Direction = ParameterDirection.ReturnValue;
341352
c.Parameters.Add(returnParameter);

‎ExpressiveDbCommand.cs‎

Lines changed: 22 additions & 31 deletions
Original file line numberDiff line numberDiff line change
@@ -1,49 +1,40 @@
11
using System.Collections.Generic;
22
using System.Data;
33
using System.Data.Common;
4-
using System.Linq;
54

65
namespace Open.Database.Extensions
76
{
87

9-
/// <summary>
10-
/// An abstraction for executing commands on a database using best practices and simplified expressive syntax.
11-
/// </summary>
12-
public class ExpressiveDbCommand : ExpressiveDbCommandBase<DbConnection, DbCommand, DbType, ExpressiveDbCommand>
8+
/// <summary>
9+
/// An abstraction for executing commands on a database using best practices and simplified expressive syntax.
10+
/// </summary>
11+
public class ExpressiveDbCommand : ExpressiveDbCommandBase<DbConnection, DbCommand, DbType, ExpressiveDbCommand>
1312
{
1413
/// <param name="connFactory">The factory to generate connections from.</param>
1514
/// <param name="type">The command type>.</param>
1615
/// <param name="command">The SQL command.</param>
1716
/// <param name="params">The list of params</param>
18-
public ExpressiveDbCommand(IDbConnectionFactory<DbConnection> connFactory, CommandType type, string command, List<Param> @params)
19-
: base(connFactory, type, command, @params?.ToList())
17+
public ExpressiveDbCommand(
18+
IDbConnectionFactory<DbConnection> connFactory,
19+
CommandType type,
20+
string command,
21+
IEnumerable<Param> @params = null)
22+
: base(connFactory, type, command, @params)
2023
{
2124
}
2225

23-
/// <param name="connFactory">The factory to generate connections from.</param>
24-
/// <param name="type">The command type>.</param>
25-
/// <param name="command">The SQL command.</param>
26-
/// <param name="params">The list of params</param>
27-
public ExpressiveDbCommand(IDbConnectionFactory<DbConnection> connFactory, CommandType type, string command, params Param[] @params)
28-
: base(connFactory, type, command, @params?.ToList())
29-
{
30-
}
31-
32-
/// <param name="connection">The connection to execute the command on.</param>
33-
/// <param name="type">The command type>.</param>
34-
/// <param name="command">The SQL command.</param>
35-
/// <param name="params">The list of params</param>
36-
public ExpressiveDbCommand(DbConnection connection, CommandType type, string command, List<Param> @params)
37-
: base(connection, type, command, @params?.ToList())
38-
{
39-
}
40-
41-
/// <param name="connection">The connection to execute the command on.</param>
42-
/// <param name="type">The command type>.</param>
43-
/// <param name="command">The SQL command.</param>
44-
/// <param name="params">The list of params</param>
45-
public ExpressiveDbCommand(DbConnection connection, CommandType type, string command, params Param[] @params)
46-
: this(connection, type, command, @params?.ToList())
26+
/// <param name="connection">The connection to execute the command on.</param>
27+
/// <param name="transaction">The optional transaction to execute the command on.</param>
28+
/// <param name="type">The command type>.</param>
29+
/// <param name="command">The SQL command.</param>
30+
/// <param name="params">The list of params</param>
31+
public ExpressiveDbCommand(
32+
DbConnection connection,
33+
DbTransaction transaction,
34+
CommandType type,
35+
string command,
36+
IEnumerable<Param> @params = null)
37+
: base(connection, transaction, type, command, @params)
4738
{
4839
}
4940

‎ExpressiveDbCommandBase.cs‎

Lines changed: 6 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -32,21 +32,23 @@ protected ExpressiveDbCommandBase(
3232
IDbConnectionFactory<TConnection> connFactory,
3333
CommandType type,
3434
string command,
35-
List<Param> @params)
35+
IEnumerable<Param> @params)
3636
: base(connFactory, type, command, @params)
3737
{
3838
}
3939

4040
/// <param name="connection">The connection to execute the command on.</param>
41+
/// <param name="transaction">The optional transaction to execute the command on.</param>
4142
/// <param name="type">The command type>.</param>
4243
/// <param name="command">The SQL command.</param>
4344
/// <param name="params">The list of params</param>
4445
protected ExpressiveDbCommandBase(
4546
TConnection connection,
47+
IDbTransaction transaction,
4648
CommandType type,
4749
string command,
48-
List<Param> @params)
49-
: base(connection, type, command, @params)
50+
IEnumerable<Param> @params)
51+
: base(connection, transaction, type, command, @params)
5052
{
5153
}
5254

@@ -223,6 +225,7 @@ public Task IterateReaderAsync(Action<IDataRecord> handler, CancellationToken? t
223225
/// Iterates asynchronously until the handler returns false. Then cancels.
224226
/// </summary>
225227
/// <param name="predicate">If true, the iteration continues.</param>
228+
/// <param name="token">An optional cancellation token.</param>
226229
/// <returns>The task that completes when the iteration is done or the predicate evaluates false.</returns>
227230
public Task IterateReaderAsyncWhile(Func<IDataRecord, bool> predicate, CancellationToken? token = null)
228231
=> ExecuteAsync(command => command.IterateReaderAsyncWhile(predicate), token);

‎Extensions.ConnectionFactory.cs‎

Lines changed: 26 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -155,7 +155,20 @@ public static ExpressiveDbCommand Command(
155155
this DbConnection target,
156156
string command,
157157
CommandType type = CommandType.Text)
158-
=> new ExpressiveDbCommand(target, type, command);
158+
=> new ExpressiveDbCommand(target, null, type, command);
159+
160+
/// <summary>
161+
/// Creates an ExpressiveDbCommand for subsequent configuration and execution.
162+
/// </summary>
163+
/// <param name="target">The transaction to execute the command on.</param>
164+
/// <param name="command">The command text or stored procedure name to use.</param>
165+
/// <param name="type">The command type.</param>
166+
/// <returns>The resultant ExpressiveDbCommand.</returns>
167+
public static ExpressiveDbCommand Command(
168+
this DbTransaction target,
169+
string command,
170+
CommandType type = CommandType.Text)
171+
=> new ExpressiveDbCommand(target.Connection, target, type, command);
159172

160173
/// <summary>
161174
/// Creates an ExpressiveDbCommand with command type set to StoredProcedure for subsequent configuration and execution.
@@ -166,7 +179,18 @@ public static ExpressiveDbCommand Command(
166179
public static ExpressiveDbCommand StoredProcedure(
167180
this DbConnection target,
168181
string command)
169-
=> new ExpressiveDbCommand(target, CommandType.StoredProcedure, command);
182+
=> new ExpressiveDbCommand(target, null, CommandType.StoredProcedure, command);
183+
184+
/// <summary>
185+
/// Creates an ExpressiveDbCommand with command type set to StoredProcedure for subsequent configuration and execution.
186+
/// </summary>
187+
/// <param name="target">The transaction to execute the command on.</param>
188+
/// <param name="command">The command text or stored procedure name to use.</param>
189+
/// <returns>The resultant ExpressiveDbCommand.</returns>
190+
public static ExpressiveDbCommand StoredProcedure(
191+
this DbTransaction target,
192+
string command)
193+
=> new ExpressiveDbCommand(target.Connection, target, CommandType.StoredProcedure, command);
170194

171195
/// <summary>
172196
/// Creates an ExpressiveDbCommand for subsequent configuration and execution.

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