From 92b97ba3f3ee634e101483f5129f25b4f8230117 Mon Sep 17 00:00:00 2001
From: jakob <jakob@eggerapps.at>
Date: Wed, 30 Jun 2010 13:40:38 +0000
Subject: Improved calling of stored procedures: - added the
 CLIENT_MULTI_RESULTS flag to the connection flags - automatically discard all
 remaining results when unlocking the connection

This is not a perfect solution, but will improve usability a lot for those who often call stored procedures. Sequel Pro still doesn't support multiple results -- it will show only the first and silently discard all the remaining ones.
---
 Frameworks/MCPKit/MCPFoundationKit/MCPConnection.h |  1 +
 Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m | 32 ++++++++++++++++++++--
 2 files changed, 31 insertions(+), 2 deletions(-)

(limited to 'Frameworks/MCPKit/MCPFoundationKit')

diff --git a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.h b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.h
index 60c9dcb6..4b2e0cdb 100644
--- a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.h
+++ b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.h
@@ -277,6 +277,7 @@ void performThreadedKeepAlive(void *ptr);
 - (void)cancelCurrentQuery;
 - (BOOL)queryCancelled;
 - (BOOL)queryCancellationUsedReconnect;
+- (void)flushMultiResults;
 
 // Locking
 - (void)lockConnection;
diff --git a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
index b2080c26..9ca945a7 100644
--- a/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
+++ b/Frameworks/MCPKit/MCPFoundationKit/MCPConnection.m
@@ -43,7 +43,7 @@
 BOOL lastPingSuccess;
 BOOL pingActive;
 
-const NSUInteger kMCPConnectionDefaultOption = CLIENT_COMPRESS | CLIENT_REMEMBER_OPTIONS ;
+const NSUInteger kMCPConnectionDefaultOption = CLIENT_COMPRESS | CLIENT_REMEMBER_OPTIONS | CLIENT_MULTI_RESULTS;
 const char *kMCPConnectionDefaultSocket = MYSQL_UNIX_ADDR;
 const NSUInteger kMCPConnection_Not_Inited = 1000;
 const NSUInteger kLengthOfTruncationForLog = 100;
@@ -1485,7 +1485,9 @@ void performThreadedKeepAlive(void *ptr)
 				// For normal result sets, fetch the results and unlock the connection
 				if (streamResultType == MCPStreamingNone) {
 					theResult = [[MCPResult alloc] initWithMySQLPtr:mConnection encoding:mEncoding timeZone:mTimeZone];
-					if (!queryCancelled || !queryCancelUsedReconnect) [self unlockConnection];
+					if (!queryCancelled || !queryCancelUsedReconnect) {
+                        [self unlockConnection];
+                    }
 				
 				// For streaming result sets, fetch the result pointer and leave the connection locked
 				} else if (streamResultType == MCPStreamingFast) {
@@ -1695,6 +1697,25 @@ void performThreadedKeepAlive(void *ptr)
 	return queryCancelUsedReconnect;
 }
 
+/**
+ * Retrieves all remaining results and discards them.
+ * Necessary if we only retrieve one result, and want to discard all the others.
+ */
+- (void)flushMultiResults
+{
+    // repeat as long as there are results
+    while(!mysql_next_result(mConnection))
+    {
+        MYSQL_RES *result = mysql_use_result(mConnection);
+        // check if the result is really a result
+        if (result) {
+            // retrieve all rows
+            while (mysql_fetch_row(result));
+            mysql_free_result(result);
+        }
+    }
+}
+
 #pragma mark -
 #pragma mark Connection locking
 
@@ -1746,6 +1767,13 @@ void performThreadedKeepAlive(void *ptr)
         NSLog(@"Tried to unlock the connection, but it wasn't locked.");
     }
     
+    // Since we connected with CLIENT_MULTI_RESULT, we must make sure there are nor more results!
+    // This is still a bit of a dirty hack
+    if (mysql_more_results(mConnection)) {
+        NSLog(@"Discarding unretrieved results. This is currently normal when using CALL.");
+        [self flushMultiResults];
+    }
+    
     // We tell everyone that the connection is available again!
     [connectionLock unlockWithCondition:MCPConnectionIdle];
 }
-- 
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