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authorrowanbeentje <rowan@beent.je>2009-06-17 00:18:10 +0000
committerrowanbeentje <rowan@beent.je>2009-06-17 00:18:10 +0000
commit59f37e44da3450d37356c87129a3d8592d5c2259 (patch)
treeb9b0c80d498ea3ec0c0fa5b78306144d466614d8 /Source
parent64f60651f176ba49d70790cdbb9f83488dc76612 (diff)
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Significant connection improvements:
- Restored MySQL 3 compatibility - max_packet_size details are now cached per connection for query speedup and to fix network recovery problems - Improved disconnection recovery - Errors during results fetching are correctly detected for the first time - Error strings are now correctly set in several places - The correct number of rows affected is now returned for queries which triggered reconnects or max_packet_size increases
Diffstat (limited to 'Source')
-rw-r--r--Source/CMMCPConnection.h7
-rw-r--r--Source/CMMCPConnection.m126
2 files changed, 98 insertions, 35 deletions
diff --git a/Source/CMMCPConnection.h b/Source/CMMCPConnection.h
index 03a5079f..f69c3069 100644
--- a/Source/CMMCPConnection.h
+++ b/Source/CMMCPConnection.h
@@ -52,6 +52,8 @@
NSString *connectionHost;
int connectionPort;
NSString *connectionSocket;
+ int maxAllowedPacketSize;
+ unsigned long connectionThreadId;
int connectionTimeout;
int currentSSHTunnelState;
BOOL useKeepAlive;
@@ -60,6 +62,7 @@
float lastQueryExecutionTime;
NSString *lastQueryErrorMessage;
unsigned int lastQueryErrorId;
+ my_ulonglong lastQueryAffectedRows;
BOOL isMaxAllowedPacketEditable;
@@ -91,7 +94,7 @@
- (float) lastQueryExecutionTime;
- (MCPResult *) listDBsLike:(NSString *) dbsName;
- (BOOL) checkConnection;
-- (void) restoreEncodingDetails;
+- (void) restoreConnectionDetails;
- (void) setDelegate:(id)object;
- (NSTimeZone *) timeZone;
- (BOOL) pingConnection;
@@ -100,6 +103,8 @@
- (void) keepAlive:(NSTimer *)theTimer;
- (void) threadedKeepAlive;
- (const char *) cStringFromString:(NSString *) theString usingEncoding:(NSStringEncoding) encoding;
+- (void) setLastErrorMessage:(NSString *)theErrorMessage;
+- (BOOL) fetchMaxAllowedPacket;
- (int) getMaxAllowedPacket;
- (BOOL) isMaxAllowedPacketEditable;
- (int) setMaxAllowedPacketTo:(int)newSize resetSize:(BOOL)reset;
diff --git a/Source/CMMCPConnection.m b/Source/CMMCPConnection.m
index fdb92d59..5d5cf52e 100644
--- a/Source/CMMCPConnection.m
+++ b/Source/CMMCPConnection.m
@@ -39,7 +39,7 @@ static void forcePingTimeout(int signalNumber);
{
if( mConnected ) {
CMMCPResult *theResult;
- theResult = [self queryString:@"SHOW VARIABLES WHERE Variable_name = 'version'"];
+ theResult = [self queryString:@"SHOW VARIABLES LIKE 'version'"];
if ([theResult numOfRows]) {
[theResult dataSeek:0];
serverVersionString = [[NSString stringWithString:[[theResult fetchRowAsArray] objectAtIndex:1]] retain];
@@ -129,9 +129,12 @@ static void forcePingTimeout(int signalNumber);
keepAliveInterval = [[[NSUserDefaults standardUserDefaults] objectForKey:@"KeepAliveInterval"] doubleValue];
if (!keepAliveInterval) keepAliveInterval = 0;
lastKeepAliveSuccess = nil;
+ connectionThreadId = 0;
+ maxAllowedPacketSize = -1;
lastQueryExecutionTime = 0;
lastQueryErrorId = 0;
lastQueryErrorMessage = nil;
+ lastQueryAffectedRows = 0;
if (![NSBundle loadNibNamed:@"ConnectionErrorDialog" owner:self]) {
NSLog(@"Connection error dialog could not be loaded; connection failure handling will not function correctly.");
}
@@ -244,6 +247,7 @@ static void forcePingTimeout(int signalNumber);
theRet = mysql_real_connect(mConnection, theHost, theLogin, thePass, NULL, connectionPort, theSocket, mConnectionFlags);
thePass = NULL;
if (theRet != mConnection) {
+ [self setLastErrorMessage:nil];
if (connectionTunnel) {
[connectionTunnel disconnect];
[delegate setStatusIconToImageWithName:@"ssh-disconnected"];
@@ -253,9 +257,18 @@ static void forcePingTimeout(int signalNumber);
mConnected = YES;
mEncoding = [MCPConnection encodingForMySQLEncoding:mysql_character_set_name(mConnection)];
+ connectionThreadId = mConnection->thread_id;
[self timeZone]; // Getting the timezone used by the server.
isMaxAllowedPacketEditable = [self isMaxAllowedPacketEditable];
+ if (![self fetchMaxAllowedPacket]) {
+ [self setLastErrorMessage:nil];
+ if (connectionTunnel) {
+ [connectionTunnel disconnect];
+ [delegate setStatusIconToImageWithName:@"ssh-disconnected"];
+ }
+ return mConnected = NO;
+ }
// Register notification if a query was sent to the MySQL connection
// to be able to identify the sender of that query
@@ -430,6 +443,7 @@ static void forcePingTimeout(int signalNumber);
}
}
} else if (parentWindow) {
+ [self setLastErrorMessage:nil];
// If the connection was not successfully established, ask how to proceed.
[NSApp beginSheet:connectionErrorDialog modalForWindow:parentWindow modalDelegate:self didEndSelector:nil contextInfo:nil];
@@ -488,7 +502,7 @@ static void forcePingTimeout(int signalNumber);
/*
- * Ends and existing modal session
+ * Ends an existing modal session
*/
- (IBAction) closeSheet:(id)sender
{
@@ -640,6 +654,7 @@ static void forcePingTimeout(int signalNumber);
[self startKeepAliveTimerResettingState:YES];
return YES;
}
+ [self setLastErrorMessage:nil];
if (connectionTunnel) {
[connectionTunnel disconnect];
[delegate setStatusIconToImageWithName:@"ssh-disconnected"];
@@ -689,20 +704,20 @@ static void forcePingTimeout(int signalNumber);
unsigned long theCQueryLength;
int queryResultCode;
int queryErrorId = 0;
+ my_ulonglong queryAffectedRows = 0;
int currentMaxAllowedPacket = -1;
BOOL isQueryRetry = NO;
- unsigned long threadid = mConnection->thread_id;
NSString *queryErrorMessage = nil;
// If no connection is present, return nil.
if (!mConnected) {
// Write a log entry
- [delegate queryGaveError:@"No conncetion available!"];
+ if ([delegate respondsToSelector:@selector(queryGaveError:)]) [delegate queryGaveError:@"No connection available!"];
// Notify that the query has been performed
[[NSNotificationCenter defaultCenter] postNotificationName:@"SMySQLQueryHasBeenPerformed" object:self];
// Show an error alert while resetting
- NSBeginAlertSheet(NSLocalizedString(@"Error", @"error"), @"No conncetion available!",
- nil, nil, [delegate valueForKeyPath:@"tableWindow"], self, nil, nil, nil, @"No conncetion available!");
+ NSBeginAlertSheet(NSLocalizedString(@"Error", @"error"), @"No connection available!",
+ nil, nil, [delegate valueForKeyPath:@"tableWindow"], self, nil, nil, nil, @"No connection available!");
return nil;
}
@@ -718,8 +733,8 @@ static void forcePingTimeout(int signalNumber);
// Set the length of the current query + 1 (\0)
theCQueryLength = strlen(theCQuery)+1;
- // Check query lenght against max_allowed_packet
- // If max_allowed_packet is editable for the user
+ // Check query length against max_allowed_packet; if it is larger, the
+ // query would error, so if max_allowed_packet is editable for the user
// increase it for the current session and reconnect.
if([self getMaxAllowedPacket] < theCQueryLength) {
@@ -735,8 +750,10 @@ static void forcePingTimeout(int signalNumber);
@"error message if max_allowed_packet < query size"),
theCQueryLength, [self getMaxAllowedPacket]];
- // Write a log entry
- [delegate queryGaveError:errorMessage];
+ // Write a log entry and update the connection error messages for those uses that check it
+ if ([delegate respondsToSelector:@selector(queryGaveError:)]) [delegate queryGaveError:errorMessage];
+ [self setLastErrorMessage:errorMessage];
+
// Notify that the query has been performed
[[NSNotificationCenter defaultCenter] postNotificationName:@"SMySQLQueryHasBeenPerformed" object:self];
// Show an error alert while resetting
@@ -753,16 +770,11 @@ static void forcePingTimeout(int signalNumber);
// If this query has failed once already, check the connection
if (isQueryRetry) {
if (![self checkConnection]) {
+
// Notify that the query has been performed
[[NSNotificationCenter defaultCenter] postNotificationName:@"SMySQLQueryHasBeenPerformed" object:self];
return nil;
}
-
- // If the connection thread is still the same as at the start, the
- // connection wasn't the issue - don't retry.
- if (threadid == mConnection->thread_id) break;
-
- threadid = mConnection->thread_id;
}
// Run (or re-run) the query, timing the execution time of the query - note
@@ -774,11 +786,20 @@ static void forcePingTimeout(int signalNumber);
// On success, capture the results
if (0 == queryResultCode) {
- if (mysql_field_count(mConnection) != 0)
+ if (mysql_field_count(mConnection) != 0) {
theResult = [[CMMCPResult alloc] initWithMySQLPtr:mConnection encoding:mEncoding timeZone:mTimeZone];
+ // Ensure no problem occurred during the result fetch
+ if (mysql_errno(mConnection) != 0) {
+ queryErrorMessage = [[NSString alloc] initWithString:[self stringWithCString:mysql_error(mConnection)]];
+ queryErrorId = mysql_errno(mConnection);
+ break;
+ }
+ }
+
queryErrorMessage = [[NSString alloc] initWithString:@""];
queryErrorId = 0;
+ queryAffectedRows = mysql_affected_rows(mConnection);
// On failure, set the error messages and IDs
} else {
@@ -798,17 +819,17 @@ static void forcePingTimeout(int signalNumber);
// If the mysql thread id has changed as a result of a connection error,
// ensure connection details are still correct
- if (threadid != mConnection->thread_id) [self restoreEncodingDetails];
+ if (connectionThreadId != mConnection->thread_id) [self restoreConnectionDetails];
// If max_allowed_packet was changed, reset it to default
if(currentMaxAllowedPacket > -1)
[self setMaxAllowedPacketTo:currentMaxAllowedPacket resetSize:YES];
// Update error strings and IDs
- if (lastQueryErrorMessage) [lastQueryErrorMessage release], lastQueryErrorMessage = nil;
lastQueryErrorId = queryErrorId;
- lastQueryErrorMessage = [[NSString alloc] initWithString:queryErrorMessage?queryErrorMessage:@""];
+ [self setLastErrorMessage:queryErrorMessage?queryErrorMessage:@""];
if (queryErrorMessage) [queryErrorMessage release];
+ lastQueryAffectedRows = queryAffectedRows;
// If an error occurred, inform the delegate
if (0 != queryResultCode && delegate && [delegate respondsToSelector:@selector(queryGaveError:)])
@@ -851,15 +872,10 @@ static void forcePingTimeout(int signalNumber);
*/
- (BOOL)checkConnection
{
- unsigned long threadid;
-
if (!mConnected) return NO;
BOOL connectionVerified = FALSE;
- // Get the current thread ID for this connection
- threadid = mConnection->thread_id;
-
// Check whether the connection is still operational via a wrapped version of MySQL ping.
connectionVerified = [self pingConnection];
@@ -889,7 +905,7 @@ static void forcePingTimeout(int signalNumber);
// If a connection exists, check whether the thread id differs; if so, the connection has
// probably been reestablished and we need to reset the connection encoding
- } else if (threadid != mConnection->thread_id) [self restoreEncodingDetails];
+ } else if (connectionThreadId != mConnection->thread_id) [self restoreConnectionDetails];
return connectionVerified;
}
@@ -898,8 +914,10 @@ static void forcePingTimeout(int signalNumber);
* Restore the connection encoding details as necessary based on the delegate-provided
* details.
*/
-- (void) restoreEncodingDetails
+- (void) restoreConnectionDetails
{
+ connectionThreadId = mConnection->thread_id;
+ [self fetchMaxAllowedPacket];
if (delegate && [delegate valueForKey:@"_encoding"]) {
[self queryString:[NSString stringWithFormat:@"/*!40101 SET NAMES '%@' */", [NSString stringWithString:[delegate valueForKey:@"_encoding"]]]];
if (delegate && [delegate respondsToSelector:@selector(connectionEncodingViaLatin1)]) {
@@ -1125,6 +1143,8 @@ static void forcePingTimeout(int signalNumber)
/*
* Returns a string for the last MySQL error message on the connection.
+ * This is cached within the object to allow helper queries to be performed
+ * without affecting the state that the GUI is querying.
*/
- (NSString *) getLastErrorMessage
{
@@ -1132,7 +1152,22 @@ static void forcePingTimeout(int signalNumber)
}
/*
+ * Sets the string for the last MySQL error message on the connection,
+ * managing memory as appropriate. Supply a nil string to store the
+ * last error on the connection.
+ */
+- (void) setLastErrorMessage:(NSString *)theErrorMessage
+{
+ if (!theErrorMessage) theErrorMessage = [self stringWithCString:mysql_error(mConnection)];
+
+ if (lastQueryErrorMessage) [lastQueryErrorMessage release], lastQueryErrorMessage = nil;
+ lastQueryErrorMessage = [[NSString alloc] initWithString:theErrorMessage];
+}
+
+/*
* Returns the ErrorID of the last MySQL error on the connection.
+ * This is cached within the object to allow helper queries to be performed
+ * without affecting the state that the GUI is querying.
*/
- (unsigned int) getLastErrorID
{
@@ -1140,24 +1175,47 @@ static void forcePingTimeout(int signalNumber)
}
/*
- * Retrieves max_allowed_packet size set as global variable.
- * It returns -1 if it fails.
+ * Returns the number of affected rows by the last query.
+ * This is cached within the object to allow helper queries to be performed
+ * without affecting the state that the GUI is querying.
*/
-- (int) getMaxAllowedPacket
+- (my_ulonglong) affectedRows
{
+ return lastQueryAffectedRows;
+}
- if (0 == mysql_query(mConnection, "SELECT @@global.max_allowed_packet")) {
+/*
+ * Retrieve the max_allowed_packet size from the server; returns
+ * false if the query fails.
+ */
+- (BOOL) fetchMaxAllowedPacket
+{
+ char *queryString;
+
+ if ([self serverMajorVersion] == 3) queryString = "SHOW VARIABLES LIKE 'max_allowed_packet'";
+ else queryString = "SELECT @@global.max_allowed_packet";
+ if (0 == mysql_query(mConnection, queryString)) {
if (mysql_field_count(mConnection) != 0) {
CMMCPResult *r = [[CMMCPResult alloc] initWithMySQLPtr:mConnection encoding:mEncoding timeZone:mTimeZone];
NSArray *a = [r fetchRowAsArray];
[r autorelease];
- if([a count]) return [[a objectAtIndex:0] intValue];
+ if([a count]) {
+ maxAllowedPacketSize = [[a objectAtIndex:([self serverMajorVersion] == 3)?1:0] intValue];
+ return true;
+ }
}
}
- NSRunAlertPanel(@"Error", [NSString stringWithFormat:@"An error occured while retrieving max_allowed_packet size:\n\n%@", [self getLastErrorMessage]], @"OK", nil, nil);
+ return false;
+}
- return -1;
+/*
+ * Retrieves max_allowed_packet size set as global variable.
+ * It returns -1 if it fails.
+ */
+- (int) getMaxAllowedPacket
+{
+ return maxAllowedPacketSize;
}
/*