internal NpgsqlTransaction(NpgsqlConnection conn, IsolationLevel isolation)
{
_conn = conn;
_isolation = isolation;
StringBuilder commandText = new StringBuilder("BEGIN; SET TRANSACTION ISOLATION LEVEL ");
if (isolation == IsolationLevel.RepeatableRead)
{
commandText.Append("REPEATABLE READ");
}
else if ((isolation == IsolationLevel.Serializable) ||
(isolation == IsolationLevel.Snapshot))
{
commandText.Append("SERIALIZABLE");
}
else
{
// Set isolation level default to read committed.
_isolation = IsolationLevel.ReadCommitted;
commandText.Append("READ COMMITTED");
}
commandText.Append(";");
NpgsqlCommand command = new NpgsqlCommand(commandText.ToString(), conn.Connector);
command.ExecuteBlind();
_conn.Connector.Transaction = this;
}
public override IEnumerable<IServerResponseObject> QueryEnum(NpgsqlConnector context, NpgsqlCommand command)
{
// Send the query request to backend.
NpgsqlQuery.Send(command, context.Stream);
context.Stream.Flush();
return ProcessBackendResponsesEnum(context, false);
}
public static void Send(NpgsqlCommand command, Stream stream)
{
var commandStream = command.GetCommandStream();
commandStream.Position = 0;
// Log the string being sent.
//if (NpgsqlEventLog.Level >= LogLevel.Debug)
//PGUtil.LogStringWritten(commandText.ToString());
// This method needs refactory.
// The code below which deals with writing string to stream needs to be redone to use
// PGUtil.WriteString() as before. The problem is that WriteString is using too much strings (concatenation).
// Find a way to optimize that.
// Tell to mediator what command is being sent.
//TODO
command.Connector.Mediator.SqlSent = command.CommandText;
// Workaround for seek exceptions when running under ms.net. TODO: Check why Npgsql may be letting behind data in the stream.
stream.Flush();
// Send the query to server.
// Write the byte 'Q' to identify a query message.
stream.WriteByte((byte)FrontEndMessageCode.Query);
//Work out the encoding of the string (null-terminated) once and take the length from having done so
//rather than doing so repeatedly.
// Write message length. Int32 + string length + null terminator.
PGUtil.WriteInt32(stream, 4 + (int)commandStream.Length + 1);
var cms = commandStream as Revenj.Utility.ChunkedMemoryStream;
if (cms != null)
{
cms.CopyTo(stream);
stream.WriteByte(0);
}
else
{
commandStream.CopyTo(stream);
stream.WriteByte(0);
}
Thread.Yield();
}
/// <summary>
/// Opens the physical connection to the server.
/// </summary>
/// <remarks>Usually called by the RequestConnector
/// Method of the connection pool manager.</remarks>
internal void Open()
{
ServerVersion = null;
// If Connection.ConnectionString specifies a protocol version, we will
// not try to fall back to version 2 on failure.
// Reset state to initialize new connector in pool.
CurrentState = NpgsqlClosedState.Instance;
// Get a raw connection, possibly SSL...
CurrentState.Open(this);
try
{
// Establish protocol communication and handle authentication...
CurrentState.Startup(this);
}
catch (NpgsqlException)
{
throw;
}
// Change the state of connection to open and ready.
State = ConnectionState.Open;
CurrentState = NpgsqlReadyState.Instance;
// Fall back to the old way, SELECT VERSION().
// This should not happen for protocol version 3+.
if (ServerVersion == null)
{
using (NpgsqlCommand command = new NpgsqlCommand("set DATESTYLE TO ISO;select version();", this))
{
ServerVersion = new Version(PGUtil.ExtractServerVersion((string)command.ExecuteScalar()));
}
}
StringBuilder sbInit = new StringBuilder();
// Adjust client encoding.
NpgsqlParameterStatus clientEncodingParam = null;
if (!ServerParameters.TryGetValue("client_encoding", out clientEncodingParam)
|| !string.Equals(clientEncodingParam.ParameterValue, "UTF8", StringComparison.OrdinalIgnoreCase) && !string.Equals(clientEncodingParam.ParameterValue, "UNICODE", StringComparison.OrdinalIgnoreCase))
sbInit.AppendLine("SET CLIENT_ENCODING TO UTF8;");
if (!string.IsNullOrEmpty(settings.SearchPath))
{
// TODO: Add proper message when finding a semicolon in search_path.
// This semicolon could lead to a sql injection security hole as someone could write in connection string:
// searchpath=public;delete from table; and it would be executed.
if (settings.SearchPath.Contains(";"))
{
throw new InvalidOperationException();
}
sbInit.AppendLine("SET SEARCH_PATH=" + settings.SearchPath + ";");
}
if (!string.IsNullOrEmpty(settings.ApplicationName))
{
if (!SupportsApplicationName)
{
//TODO
//throw new InvalidOperationException(resman.GetString("Exception_ApplicationNameNotSupported"));
throw new InvalidOperationException("ApplicationName not supported.");
}
if (settings.ApplicationName.Contains(";"))
{
throw new InvalidOperationException();
}
sbInit.AppendLine("SET APPLICATION_NAME='" + settings.ApplicationName.Replace('\'', '-') + "';");
}
/*
* Try to set SSL negotiation to 0. As of 2010-03-29, recent problems in SSL library implementations made
* postgresql to add a parameter to set a value when to do this renegotiation or 0 to disable it.
* Currently, Npgsql has a problem with renegotiation so, we are trying to disable it here.
* This only works on postgresql servers where the ssl renegotiation settings is supported of course.
* See http://lists.pgfoundry.org/pipermail/npgsql-devel/2010-February/001065.html for more information.
*/
sbInit.AppendLine("SET ssl_renegotiation_limit=0;");
/*
* Set precision digits to maximum value possible. For postgresql before 9 it was 2, after that, it is 3.
* This way, we set first to 2 and then to 3. If there is an error because of 3, it will have been set to 2 at least.
* Check bug report #1010992 for more information.
*/
sbInit.AppendLine("SET extra_float_digits=3;");
try
{
new NpgsqlCommand(sbInit.ToString(), this).ExecuteBlind();
}
catch
{
foreach (var line in sbInit.ToString().Split(Environment.NewLine.ToCharArray()))
{
try
{
if (line.Length > 0)
{
new NpgsqlCommand(line, this).ExecuteBlind();
}
}
catch { }
}
}
// Make a shallow copy of the type mapping that the connector will own.
// It is possible that the connector may add types to its private
// mapping that will not be valid to another connector, even
// if connected to the same backend version.
_oidToNameMapping = NpgsqlTypesHelper.CreateAndLoadInitialTypesMapping(this).Clone();
ProcessServerVersion();
// The connector is now fully initialized. Beyond this point, it is
// safe to release it back to the pool rather than closing it.
IsInitialized = true;
}
//TODO: WTF!?
/// <summary>
/// This method checks if the connector is still ok.
/// We try to send a simple query text, select 1 as ConnectionTest;
/// </summary>
internal Boolean IsValid()
{
try
{
// Here we use a fake NpgsqlCommand, just to send the test query string.
var testValue = (ValidCounter++).ToString();
string compareValue = string.Empty;
using (NpgsqlCommand cmd = new NpgsqlCommand("select '" + testValue + "'", this))
{
compareValue = (string)cmd.ExecuteScalar();
}
if (compareValue != testValue)
return false;
// Clear mediator.
Mediator.ResetResponses();
this.RequireReadyForQuery = true;
}
catch
{
return false;
}
return true;
}
///<summary>
///
/// This method is reponsible to derive the command parameter list with values obtained from function definition.
/// It clears the Parameters collection of command. Also, if there is any parameter type which is not supported by Npgsql, an InvalidOperationException will be thrown.
/// Parameters name will be parameter1, parameter2, ...
/// For while, only parameter name and NpgsqlDbType are obtained.
///</summary>
/// <param name="command">NpgsqlCommand whose function parameters will be obtained.</param>
public static void DeriveParameters(NpgsqlCommand command)
{
// Updated after 0.99.3 to support the optional existence of a name qualifying schema and case insensitivity when the schema ror procedure name do not contain a quote.
// This fixed an incompatibility with NpgsqlCommand.CheckFunctionReturn(String ReturnType)
String query = null;
string procedureName = null;
string schemaName = null;
string[] fullName = command.CommandText.Split('.');
if (fullName.Length > 1 && fullName[0].Length > 0)
{
query =
"select proargnames, proargtypes from pg_proc p left join pg_namespace n on p.pronamespace = n.oid where proname=:proname and n.nspname=:nspname";
schemaName = (fullName[0].IndexOf("\"") != -1) ? fullName[0] : fullName[0].ToLower();
procedureName = (fullName[1].IndexOf("\"") != -1) ? fullName[1] : fullName[1].ToLower();
}
else
{
query = "select proargnames, proargtypes from pg_proc where proname = :proname";
procedureName = (fullName[0].IndexOf("\"") != -1) ? fullName[0] : fullName[0].ToLower();
}
using (NpgsqlCommand c = new NpgsqlCommand(query, command.Connection))
{
c.Parameters.Add(new NpgsqlParameter("proname", NpgsqlDbType.Text));
c.Parameters[0].Value = procedureName.Replace("\"", "").Trim();
if (fullName.Length > 1 && !String.IsNullOrEmpty(schemaName))
{
NpgsqlParameter prm = c.Parameters.Add(new NpgsqlParameter("nspname", NpgsqlDbType.Text));
prm.Value = schemaName.Replace("\"", "").Trim();
}
String[] names = null;
String[] types = null;
using (NpgsqlDataReader rdr = c.ExecuteReader(CommandBehavior.SingleRow | CommandBehavior.SingleResult))
{
if (rdr.Read())
{
if (!rdr.IsDBNull(0))
names = rdr.GetValue(0) as String[];
if (!rdr.IsDBNull(1))
types = rdr.GetString(1).Split();
}
}
if (types == null)
{
throw new InvalidOperationException(
String.Format(resman.GetString("Exception_InvalidFunctionName"), command.CommandText));
}
command.Parameters.Clear();
for (Int32 i = 0; i < types.Length; i++)
{
// skip parameter if type string is empty
// empty parameter lists can cause this
if (!string.IsNullOrEmpty(types[i]))
{
NpgsqlBackendTypeInfo typeInfo = null;
if (!c.Connector.OidToNameMapping.TryGetValue(int.Parse(types[i]), out typeInfo))
{
command.Parameters.Clear();
throw new InvalidOperationException(String.Format("Invalid parameter type: {0}", types[i]));
}
if (names != null && i < names.Length)
command.Parameters.Add(new NpgsqlParameter(":" + names[i], typeInfo.NpgsqlDbType));
else
command.Parameters.Add(new NpgsqlParameter("parameter" + (i + 1).ToString(), typeInfo.NpgsqlDbType));
}
}
}
}
private NpgsqlCommand BuildCommand(StringBuilder query, string[] restrictions, bool addWhere, params string[] names)
{
NpgsqlCommand command = new NpgsqlCommand();
if (restrictions != null && names != null)
{
for (int i = 0; i < restrictions.Length && i < names.Length; ++i)
{
if (restrictions[i] != null && restrictions[i].Length != 0)
{
if (addWhere)
{
query.Append(" WHERE ");
addWhere = false;
}
else
{
query.Append(" AND ");
}
string paramName = RemoveSpecialChars(names[i]);
query.AppendFormat("{0} = :{1}", names[i], paramName);
command.Parameters.Add(new NpgsqlParameter(paramName, restrictions[i]));
}
}
}
command.CommandText = query.ToString();
command.Connection = _connection;
return command;
}
/// <summary>
/// Create a new command based on this one.
/// </summary>
/// <returns>A new NpgsqlCommand object.</returns>
public NpgsqlCommand Clone()
{
// TODO: Add consistency checks.
NpgsqlCommand clone = new NpgsqlCommand(CommandText, Connection, Transaction);
clone.CommandTimeout = CommandTimeout;
clone.CommandType = CommandType;
clone.DesignTimeVisible = DesignTimeVisible;
if (ExpectedTypes != null)
{
clone.ExpectedTypes = (Type[])ExpectedTypes.Clone();
}
foreach (NpgsqlParameter parameter in Parameters)
{
clone.Parameters.Add(parameter.Clone());
}
return clone;
}
internal void ReleaseRegisteredListen()
{
//Query(new NpgsqlCommand("unlisten *", this));
using (NpgsqlCommand cmd = new NpgsqlCommand("unlisten *", this))
{
Query(cmd);
}
}
internal IEnumerable<IServerResponseObject> QueryEnum(NpgsqlCommand queryCommand)
{
if (CurrentReader != null)
{
if (!CurrentReader._cleanedUp)
{
throw new InvalidOperationException(
"There is already an open DataReader associated with this Command which must be closed first.");
}
CurrentReader.Close();
}
return CurrentState.QueryEnum(this, queryCommand);
}
/*
* Constructs the LargeObject API.
*
* <p><b>Important Notice</b>
* <br>This method should only be called by org.postgresql.Connection
*
* <p>There should only be one LargeObjectManager per Connection. The
* org.postgresql.Connection class keeps track of the various extension API's
* and it's advised you use those to gain access, and not going direct.
*/
public LargeObjectManager(NpgsqlConnection conn)
{
// We need Fastpath to do anything
// Now get the function oid's for the api
//
// This is an example of Fastpath.addFunctions();
//
//String sql;
StringBuilder sql = null;
try
{
sql = new StringBuilder();
if (conn.PostgreSqlVersion > new Version(7, 3, 0))
{
sql.Append("SELECT p.proname,p.oid ");
sql.Append(" FROM pg_catalog.pg_proc p, pg_catalog.pg_namespace n ");
sql.Append(" WHERE p.pronamespace=n.oid AND n.nspname='pg_catalog' AND (");
}
else
{
sql.Append("SELECT proname,oid FROM pg_proc WHERE ");
}
sql.Append(" proname = 'lo_open'");
sql.Append(" or proname = 'lo_close'");
sql.Append(" or proname = 'lo_creat'");
sql.Append(" or proname = 'lo_unlink'");
sql.Append(" or proname = 'lo_lseek'");
sql.Append(" or proname = 'lo_tell'");
sql.Append(" or proname = 'loread'");
sql.Append(" or proname = 'lowrite'");
if (conn.PostgreSqlVersion > new Version(7, 3, 0))
{
sql.Append(")");
}
using (IDbCommand cmd = new NpgsqlCommand(sql.ToString()))
{
cmd.Connection = conn;
this.fp = new Fastpath(conn, conn.Connector.Stream);
using (IDataReader res = cmd.ExecuteReader())
{
if (res == null)
{
throw new NpgsqlException("postgresql.lo.init");
}
fp.AddFunctions(res);
}
}
}
finally
{
sql = null;
}
}
public void CommitTransaction()
{
NpgsqlConnection connection = GetConnection();
NpgsqlCommand command = null;
if (_prepared)
{
command = new NpgsqlCommand(string.Format("COMMIT PREPARED '{0}'", _txName), connection);
}
else
{
command = new NpgsqlCommand("COMMIT", connection);
}
command.ExecuteBlind();
}
public void RollbackTransaction()
{
NpgsqlConnection connection = GetConnection();
NpgsqlCommand command = null;
if (_prepared)
{
command = new NpgsqlCommand(string.Format("ROLLBACK PREPARED '{0}'", _txName), connection);
}
else
{
command = new NpgsqlCommand("ROLLBACK", connection);
}
command.ExecuteBlind();
}
public void PrepareTransaction()
{
if (!_prepared)
{
NpgsqlConnection connection = GetConnection();
NpgsqlCommand command = new NpgsqlCommand(string.Format("PREPARE TRANSACTION '{0}'", _txName), connection);
command.ExecuteBlind();
_prepared = true;
}
}
/// <summary>
/// Given command is executed upon Start() and all requested copy data is written to toStream immediately.
/// </summary>
public NpgsqlCopyOut(NpgsqlCommand cmd, NpgsqlConnection conn, Stream toStream)
{
_context = conn.Connector;
_cmd = cmd;
_copyStream = toStream;
}
/// <summary>
/// Given command is run upon Start(), after which CopyStream provides data from database as requested in the query.
/// </summary>
public NpgsqlCopyOut(NpgsqlCommand cmd, NpgsqlConnection conn)
: this(cmd, conn, null)
{
}
internal ForwardsOnlyDataReader GetReader(CommandBehavior cb)
{
try
{
CheckConnectionState();
var connector = Connector;
if (PreparedQuery != null)
connector.PrepareOrAdd(PreparedQuery, PreparedParams, text);
// reset any responses just before getting new ones
connector.Mediator.ResetResponses();
// Set command timeout.
connector.Mediator.CommandTimeout = CommandTimeout;
using (connector.BlockNotificationThread())
{
ForwardsOnlyDataReader reader;
if (parse == null)
{
reader = new ForwardsOnlyDataReader(connector.QueryEnum(this), cb, this,
connector.BlockNotificationThread(), false);
if (type == CommandType.StoredProcedure
&& reader.FieldCount == 1
&& reader.GetDataTypeName(0) == "refcursor")
{
// When a function returns a sole column of refcursor, transparently
// FETCH ALL from every such cursor and return those results.
StringBuilder sb = new StringBuilder();
while (reader.Read())
{
sb.Append("fetch all from \"").Append(reader.GetString(0)).Append("\";");
}
sb.Append(";"); // Just in case the list of cursors is empty.
//reader = new NpgsqlCommand(sb.ToString(), Connection).GetReader(reader._behavior);
// Passthrough the commandtimeout to the inner command, so user can also control its timeout.
// TODO: Check if there is a better way to handle that.
NpgsqlCommand c = new NpgsqlCommand(sb.ToString(), Connection);
c.CommandTimeout = this.CommandTimeout;
reader = c.GetReader(reader._behavior);
}
}
else
{
BindParameters();
reader = new ForwardsOnlyDataReader(connector.ExecuteEnum(new NpgsqlExecute(bind.PortalName, 0)), cb, this,
connector.BlockNotificationThread(), true);
}
return reader;
}
}
catch (IOException ex)
{
throw ClearPoolAndCreateException(ex);
}
}
internal void PrepareOrAdd(string planName, string types, string query)
{
if (!CachedPlans.Contains(planName))
{
using (NpgsqlCommand cmd = new NpgsqlCommand("PREPARE \"" + planName + "\"(" + types + ") AS " + query, this))
Query(cmd);
CachedPlans.Add(planName);
}
}
// State
internal void Query(NpgsqlCommand queryCommand)
{
CurrentState.Query(this, queryCommand);
}
public virtual void FunctionCall(NpgsqlConnector context, NpgsqlCommand command)
{
throw new InvalidOperationException("Internal Error! " + this);
}
/// <summary>
/// This method is responsible to release all portals used by this Connector.
/// </summary>
internal void ReleasePlansPortals()
{
Int32 i = 0;
if (_planIndex > 0)
{
for (i = 1; i <= _planIndex; i++)
{
try
{
//Query(new NpgsqlCommand(String.Format("deallocate \"{0}\";", _planNamePrefix + i), this));
using (NpgsqlCommand cmd = new NpgsqlCommand(String.Format("deallocate \"{0}\";", _planNamePrefix + i.ToString()), this))
{
Query(cmd);
}
}
// Ignore any error which may occur when releasing portals as this portal name may not be valid anymore. i.e.: the portal name was used on a prepared query which had errors.
catch { }
}
}
foreach (var cp in CachedPlans)
{
try
{
using (NpgsqlCommand cmd = new NpgsqlCommand("deallocate \"" + cp + "\";", this))
Query(cmd);
}
// Ignore any error which may occur when releasing portals as this portal name may not be valid anymore. i.e.: the portal name was used on a prepared query which had errors.
catch { }
}
CachedPlans.Clear();
_portalIndex = 0;
_planIndex = 0;
}
public virtual IEnumerable<IServerResponseObject> QueryEnum(NpgsqlConnector context, NpgsqlCommand command)
{
throw new InvalidOperationException("Internal Error! " + this);
}
/// <summary>
/// Rolls back a transaction from a pending state.
/// </summary>
public override void Rollback()
{
CheckDisposed();
if (_conn == null)
{
throw new InvalidOperationException(Exception_NoTransaction);
}
NpgsqlCommand command = new NpgsqlCommand("ROLLBACK", _conn.Connector);
command.ExecuteBlind();
_conn.Connector.Transaction = null;
_conn = null;
}
private Boolean CheckFunctionNeedsColumnDefinitionList()
{
// If and only if a function returns "record" and has no OUT ("o" in proargmodes), INOUT ("b"), or TABLE
// ("t") return arguments to characterize the result columns, we must provide a column definition list.
// See http://pgfoundry.org/forum/forum.php?thread_id=1075&forum_id=519
// We would use our Output and InputOutput parameters to construct that column definition list. If we have
// no such parameters, skip the check: we could only construct "AS ()", which yields a syntax error.
// Updated after 0.99.3 to support the optional existence of a name qualifying schema and allow for case insensitivity
// when the schema or procedure name do not contain a quote.
// The hard-coded schema name 'public' was replaced with code that uses schema as a qualifier, only if it is provided.
String returnRecordQuery;
StringBuilder parameterTypes = new StringBuilder("");
// Process parameters
Boolean seenDef = false;
foreach (NpgsqlParameter p in Parameters)
{
if ((p.Direction == ParameterDirection.Input) || (p.Direction == ParameterDirection.InputOutput))
{
parameterTypes.Append(Connection.Connector.OidToNameMapping[p.TypeInfo.Name].OID.ToString() + " ");
}
if ((p.Direction == ParameterDirection.Output) || (p.Direction == ParameterDirection.InputOutput))
{
seenDef = true;
}
}
if (!seenDef)
{
return false;
}
// Process schema name.
String schemaName = String.Empty;
String procedureName = String.Empty;
String[] fullName = CommandText.Split('.');
String predicate = "prorettype = ( select oid from pg_type where typname = 'record' ) "
+ "and proargtypes=:proargtypes and proname=:proname "
// proargmodes && array['o','b','t']::"char"[] performs just as well, but it requires PostgreSQL 8.2.
+ "and ('o' = any (proargmodes) OR 'b' = any (proargmodes) OR 't' = any (proargmodes)) is not true";
if (fullName.Length == 2)
{
returnRecordQuery =
"select count(*) > 0 from pg_proc p left join pg_namespace n on p.pronamespace = n.oid where " + predicate + " and n.nspname=:nspname";
schemaName = (fullName[0].IndexOf("\"") != -1) ? fullName[0] : fullName[0].ToLower();
procedureName = (fullName[1].IndexOf("\"") != -1) ? fullName[1] : fullName[1].ToLower();
}
else
{
// Instead of defaulting don't use the nspname, as an alternative, query pg_proc and pg_namespace to try and determine the nspname.
//schemaName = "public"; // This was removed after build 0.99.3 because the assumption that a function is in public is often incorrect.
returnRecordQuery =
"select count(*) > 0 from pg_proc p where " + predicate;
procedureName = (CommandText.IndexOf("\"") != -1) ? CommandText : CommandText.ToLower();
}
bool ret;
using (NpgsqlCommand c = new NpgsqlCommand(returnRecordQuery, Connection))
{
c.Parameters.Add(new NpgsqlParameter("proargtypes", NpgsqlDbType.Oidvector));
c.Parameters.Add(new NpgsqlParameter("proname", NpgsqlDbType.Name));
c.Parameters[0].Value = parameterTypes.ToString();
c.Parameters[1].Value = procedureName;
if (schemaName != null && schemaName.Length > 0)
{
c.Parameters.Add(new NpgsqlParameter("nspname", NpgsqlDbType.Name));
c.Parameters[2].Value = schemaName;
}
ret = (Boolean)c.ExecuteScalar();
}
// reset any responses just before getting new ones
m_Connector.Mediator.ResetResponses();
// Set command timeout.
m_Connector.Mediator.CommandTimeout = CommandTimeout;
return ret;
}
public void Query(NpgsqlConnector context, NpgsqlCommand command)
{
IterateThroughAllResponses(QueryEnum(context, command));
}
/// <summary>
/// Creates a transaction save point.
/// </summary>
public void Save(String savePointName)
{
CheckDisposed();
if (_conn == null)
{
throw new InvalidOperationException(Exception_NoTransaction);
}
if (!_conn.Connector.SupportsSavepoint)
{
throw new InvalidOperationException(Exception_SavePointNotSupported);
}
if (savePointName.Contains(";"))
{
throw new InvalidOperationException(Exception_SavePointWithSemicolon);
}
NpgsqlCommand command = new NpgsqlCommand("SAVEPOINT " + savePointName, _conn.Connector);
command.ExecuteBlind();
}
public void TestNotify(NpgsqlConnector context)
{
//ZA Hnotifytest CNOTIFY Z
//Qlisten notifytest;notify notifytest;
Stream stm = context.Stream;
string uuidString = "uuid" + Guid.NewGuid().ToString("N");
PGUtil.WriteString("Qlisten " + uuidString + ";notify " + uuidString + ";", stm);
Queue<byte> buffer = new Queue<byte>();
byte[] convertBuffer = new byte[36];
for (; ; )
{
int newByte = stm.ReadByte();
if (newByte == -1)
{
throw new EndOfStreamException();
}
buffer.Enqueue((byte)newByte);
if (buffer.Count > 35)
{
buffer.CopyTo(convertBuffer, 0);
if (ENCODING_UTF8.GetString(convertBuffer) == uuidString)
{
for (; ; )
{
switch (stm.ReadByte())
{
case -1:
throw new EndOfStreamException();
case 'Z':
//context.Query(new NpgsqlCommand("UNLISTEN *", context));
using (NpgsqlCommand cmd = new NpgsqlCommand("UNLISTEN *", context))
{
context.Query(cmd);
}
return;
}
}
}
else
{
buffer.Dequeue();
}
}
}
}
public string CheckParameter(string paramName)
{
NpgsqlParameterStatus ps = null;
if (_serverParameters.TryGetValue(paramName, out ps))
return ps.ParameterValue;
try
{
using (NpgsqlCommand cmd = new NpgsqlCommand("show " + paramName, this))
{
string paramValue = (string)cmd.ExecuteScalar();
AddParameterStatus(new NpgsqlParameterStatus(paramName, paramValue));
return paramValue;
}
}
/*
* In case of problems with the command above, we simply return null in order to
* say we don't support it.
*/
catch (NpgsqlException)
{
return null;
}
/*
* Original catch handler by Jon Hanna.
* 7.3 version doesn't support error code. Only 7.4+
* catch(NpgsqlException ne)
{
if(ne.Code == "42704")//unrecognized configuration parameter
return null;
else
throw;
}*/
}
public NpgsqlQuery(NpgsqlCommand command)
{
_command = command;
}
public NpgsqlDataAdapter(NpgsqlCommand selectCommand)
{
SelectCommand = selectCommand;
}
