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Overview
| Comment: | Use savepoints to implement nested transaction support. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | tkt-1f7bfff467 |
| Files: | files | file ages | folders |
| SHA1: |
712e256f4f0433abc15cbbda5495c30f |
| User & Date: | mistachkin 2016-10-28 20:09:33 |
Context
|
2016-10-28
| ||
| 21:08 | Update version history docs. check-in: 15904edeb7 user: mistachkin tags: tkt-1f7bfff467 | |
| 20:09 | Use savepoints to implement nested transaction support. check-in: 712e256f4f user: mistachkin tags: tkt-1f7bfff467 | |
|
2016-10-27
| ||
| 20:42 | Draft changes to address ticket [1f7bfff467]. check-in: 0b11868e92 user: mistachkin tags: tkt-1f7bfff467 | |
Changes
Changes to System.Data.SQLite/SQLiteTransaction.cs.
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namespace System.Data.SQLite
{
using System;
using System.Data;
using System.Data.Common;
using System.Threading;
/// <summary>
/// SQLite implementation of DbTransaction.
/// </summary>
public sealed class SQLiteTransaction : DbTransaction
{
/// <summary>
/// The connection to which this transaction is bound
................................................................................
_cnn = connection;
_version = _cnn._version;
_level = (deferredLock == true) ?
SQLiteConnection.DeferredIsolationLevel :
SQLiteConnection.ImmediateIsolationLevel;
if (_cnn._transactionLevel++ == 0)
{
try
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
if (!deferredLock)
cmd.CommandText = "BEGIN IMMEDIATE";
else
cmd.CommandText = "BEGIN";
cmd.ExecuteNonQuery();
}
}
catch (SQLiteException)
{
_cnn._transactionLevel--;
_cnn = null;
throw;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
................................................................................
/// </summary>
public override void Commit()
{
CheckDisposed();
SQLiteConnection.Check(_cnn);
IsValid(true);
if (_cnn._transactionLevel - 1 == 0)
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
cmd.CommandText = "COMMIT";
cmd.ExecuteNonQuery();
}
}
_cnn._transactionLevel--;
_cnn = null;
}
/// <summary>
/// Returns the underlying connection to which this transaction applies.
/// </summary>
public new SQLiteConnection Connection
{
get { CheckDisposed(); return _cnn; }
}
/// <summary>
/// Forwards to the local Connection property
/// </summary>
protected override DbConnection DbConnection
{
get { return Connection; }
}
/// <summary>
/// Gets the isolation level of the transaction. SQLite only supports Serializable transactions.
/// </summary>
public override IsolationLevel IsolationLevel
{
get { CheckDisposed(); return _level; }
}
/// <summary>
/// Rolls back the active transaction.
/// </summary>
public override void Rollback()
{
CheckDisposed();
SQLiteConnection.Check(_cnn);
IsValid(true);
IssueRollback(true);
}
internal void IssueRollback(bool throwError)
{
SQLiteConnection cnn = Interlocked.Exchange(ref _cnn, null);
if (cnn != null)
{
if (_cnn._transactionLevel - 1 == 0)
{
try
{
using (SQLiteCommand cmd = cnn.CreateCommand())
{
cmd.CommandText = "ROLLBACK";
cmd.ExecuteNonQuery();
}
}
catch
{
if (throwError)
throw;
}
cnn._transactionLevel--;
}
else
{
cnn._transactionLevel--;
if (throwError)
throw new SQLiteException("Cannot rollback a nested transaction");
}
}
}
internal bool IsValid(bool throwError)
{
if (_cnn == null)
{
if (throwError == true) throw new ArgumentNullException("No connection associated with this transaction");
else return false;
}
|
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namespace System.Data.SQLite
{
using System;
using System.Data;
using System.Data.Common;
using System.Threading;
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// SQLite implementation of DbTransaction.
/// </summary>
public sealed class SQLiteTransaction : DbTransaction
{
/// <summary>
/// The connection to which this transaction is bound
................................................................................
_cnn = connection;
_version = _cnn._version;
_level = (deferredLock == true) ?
SQLiteConnection.DeferredIsolationLevel :
SQLiteConnection.ImmediateIsolationLevel;
int level;
if ((level = _cnn._transactionLevel++) == 0)
{
try
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
if (!deferredLock)
cmd.CommandText = "BEGIN IMMEDIATE;";
else
cmd.CommandText = "BEGIN;";
cmd.ExecuteNonQuery();
}
}
catch (SQLiteException)
{
_cnn._transactionLevel--;
_cnn = null;
throw;
}
}
else
{
try
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
cmd.CommandText = String.Format(
"SAVEPOINT {0};", GetSavePointName(level));
cmd.ExecuteNonQuery();
}
}
catch (SQLiteException)
{
_cnn._transactionLevel--;
_cnn = null;
throw;
}
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
................................................................................
/// </summary>
public override void Commit()
{
CheckDisposed();
SQLiteConnection.Check(_cnn);
IsValid(true);
int level = _cnn._transactionLevel;
if (level - 1 == 0)
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
cmd.CommandText = "COMMIT;";
cmd.ExecuteNonQuery();
}
_cnn._transactionLevel--;
_cnn = null;
}
else
{
using (SQLiteCommand cmd = _cnn.CreateCommand())
{
cmd.CommandText = String.Format(
"RELEASE {0};", GetSavePointName(level - 1));
cmd.ExecuteNonQuery();
}
_cnn._transactionLevel--;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Returns the underlying connection to which this transaction applies.
/// </summary>
public new SQLiteConnection Connection
{
get { CheckDisposed(); return _cnn; }
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Forwards to the local Connection property
/// </summary>
protected override DbConnection DbConnection
{
get { return Connection; }
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Gets the isolation level of the transaction. SQLite only supports Serializable transactions.
/// </summary>
public override IsolationLevel IsolationLevel
{
get { CheckDisposed(); return _level; }
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Rolls back the active transaction.
/// </summary>
public override void Rollback()
{
CheckDisposed();
SQLiteConnection.Check(_cnn);
IsValid(true);
IssueRollback(true);
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Issue a ROLLBACK command against the database connection,
/// optionally re-throwing any caught exception.
/// </summary>
/// <param name="throwError">
/// Non-zero to re-throw caught exceptions.
/// </param>
internal void IssueRollback(bool throwError)
{
SQLiteConnection cnn = Interlocked.Exchange(ref _cnn, null);
if (cnn != null)
{
int level = cnn._transactionLevel;
if (level - 1 == 0)
{
try
{
using (SQLiteCommand cmd = cnn.CreateCommand())
{
cmd.CommandText = "ROLLBACK;";
cmd.ExecuteNonQuery();
}
}
catch
{
if (throwError)
throw;
}
}
else
{
try
{
using (SQLiteCommand cmd = cnn.CreateCommand())
{
cmd.CommandText = String.Format(
"ROLLBACK TO {0};", GetSavePointName(level - 1));
cmd.ExecuteNonQuery();
}
}
catch
{
if (throwError)
throw;
}
}
cnn._transactionLevel--;
}
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Constructs the name of a new or existing savepoint.
/// </summary>
/// <param name="level">
/// The transaction level associated with the connection.
/// </param>
/// <returns>
/// The name of the savepoint -OR- null if it cannot be constructed.
/// </returns>
private static string GetSavePointName(
int level
)
{
return String.Format("sqlite_dotnet_savepoint_{0}", level);
}
///////////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Checks the state of this transaction, optionally throwing an exception if a state inconsistency is found.
/// </summary>
/// <param name="throwError">
/// Non-zero to throw an exception if a state inconsistency is found.
/// </param>
/// <returns>
/// Non-zero if this transaction is valid; otherwise, false.
/// </returns>
internal bool IsValid(bool throwError)
{
if (_cnn == null)
{
if (throwError == true) throw new ArgumentNullException("No connection associated with this transaction");
else return false;
}
|
Added Tests/tkt-1f7bfff467.eagle.
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############################################################################### # # tkt-1f7bfff467.eagle -- # # Written by Joe Mistachkin. # Released to the public domain, use at your own risk! # ############################################################################### package require Eagle package require Eagle.Library package require Eagle.Test runTestPrologue ############################################################################### package require System.Data.SQLite.Test runSQLiteTestPrologue ############################################################################### runTest {test tkt-1f7bfff467-1.1 {rollback nested transaction} -setup { setupDb [set fileName tkt-1f7bfff467-1.1.db] } -body { sql execute $db { CREATE TABLE t1(x); INSERT INTO t1(x) VALUES(1); INSERT INTO t1(x) VALUES(2); INSERT INTO t1(x) VALUES(3); } set result [list] set transaction(1) [sql transaction begin $db] lappend result [sql execute -transaction $transaction(1) \ -execute scalar $db "SELECT COUNT(*) FROM t1;"] sql execute -transaction $transaction(1) $db \ "INSERT INTO t1(x) VALUES(4);" lappend result [sql execute -transaction $transaction(1) \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] set transaction(2) [sql transaction begin $db] sql execute -transaction $transaction(2) $db \ "DELETE FROM t1 WHERE x = 2;" lappend result [sql execute -transaction $transaction(2) \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] sql transaction rollback $transaction(2) sql execute -transaction $transaction(1) $db \ "UPDATE t1 SET x = 9 WHERE x = 3;" sql transaction commit $transaction(1) lappend result [sql execute \ -execute reader -format list $db \ "SELECT x FROM t1 ORDER BY x;"] set result } -cleanup { cleanupDb $fileName unset -nocomplain result transaction db fileName } -constraints {eagle command.object monoBug28 monoBug211 command.sql\ compile.DATA SQLite System.Data.SQLite} -result {3 {1 2 3 4} {1 3 4} {1 2 4 9}}} ############################################################################### runSQLiteTestEpilogue runTestEpilogue |