* Fixes a spacing issue in Duplicate DB Sheet

* Fixes a case were for string == NULL was checked instead of [string length] == 0 (fixes #1103)
* Fixes a logic error while copying databases and adds ability to copy InnoDB tables with foreign key checks (fixes #1111)

4 files changed, 49 insertions, 18 deletions

diff --git a/Source/SPDatabaseCopy.m b/Source/SPDatabaseCopy.m
index 66b6ba1b..c2371f3d 100644
--- a/Source/SPDatabaseCopy.m
+++ b/Source/SPDatabaseCopy.m
@@ -64,21 +64,15 @@
 		return NO;
 	}
 
-	BOOL success = [self createDatabase:targetDatabaseName];
+	//abort here if database creation failed
+	if(![self createDatabase:targetDatabaseName]) 
+		return NO;
 	
 	SPTableCopy *dbActionTableCopy = [[SPTableCopy alloc] init];
 	
 	[dbActionTableCopy setConnection:connection];
 	
-	for (NSString *currentTable in tables) {
-		if ([dbActionTableCopy copyTable:currentTable 						
-									from:sourceDatabaseName
-									  to:targetDatabaseName
-							 withContent:copyWithContent]) {
-		} else {
-			success = NO;
-		}
-	}
+	BOOL success = [dbActionTableCopy copyTables:tables from:sourceDatabaseName to:targetDatabaseName withContent:copyWithContent];
 	
 	[dbActionTableCopy release];
 	
diff --git a/Source/SPExportController.m b/Source/SPExportController.m
index 0ff78c1f..b22d2c32 100644
--- a/Source/SPExportController.m
+++ b/Source/SPExportController.m
@@ -639,7 +639,7 @@ static const NSString *SPSQLExportDropEnabled         = @"SQLExportDropEnabled";
 
 		// Check whether to save the export filename.  Save it if it's not blank and contains at least one
 		// token - this suggests it's not a one-off filename
-		if (![exportCustomFilenameTokenField stringValue]) {
+		if ([[exportCustomFilenameTokenField stringValue] length] < 1) {
 			[prefs removeObjectForKey:SPExportFilenameFormat];
 		} else {
 			BOOL saveFilename = NO;
diff --git a/Source/SPTableCopy.h b/Source/SPTableCopy.h
index 32eadcfc..56e1da8c 100644
--- a/Source/SPTableCopy.h
+++ b/Source/SPTableCopy.h
@@ -35,6 +35,7 @@
  * @param name name of the table in the source database
  * @param sourceDB name of the source database
  * @param targetDB name of the target database
+ * @return YES on success, NO on any kind of error (unspecified)
  */
 - (BOOL)copyTable:(NSString *)name from: (NSString *)sourceDB to: (NSString *)targetDB;
 
@@ -54,7 +55,21 @@
  * @param sourceDB name of the source database
  * @param targetDB name of the target database
  * @param copyWithContent whether to copy the content too, otherwise only structure
+ * @return YES on success, NO on any kind of error (unspecified)
  */
 - (BOOL)copyTable:(NSString *)tableName from: (NSString *)sourceDB to: (NSString *)targetDB withContent:(BOOL)copyWithContent;
 
+/**
+ * This method copies a bunch of tables including their data from one db to another.
+ *
+ * @param tableArray array of NSStrings with the table names in the sourceDB
+ * @param sourceDB name of the source database
+ * @param targetDB name of the target database
+ * @param copyWithContent whether to copy the content too, otherwise only structure
+ * @return YES on success, NO on any kind of error (unspecified)
+ *
+ * This method is able to copy InnoDB tables with foreign key constraints.
+ */
+- (BOOL)copyTables:(NSArray *)tablesArray from:(NSString *)sourceDB to:(NSString *)targetDB withContent:(BOOL)copyWithContent;
+
 @end
diff --git a/Source/SPTableCopy.m b/Source/SPTableCopy.m
index d390243c..5aa55df1 100644
--- a/Source/SPTableCopy.m
+++ b/Source/SPTableCopy.m
@@ -55,7 +55,7 @@
 	
 		[createTableStatement release];
 		
-		return [connection queryErrored];
+		return ![connection queryErrored];
 	}
 	
 	[createTableStatement release];
@@ -66,10 +66,10 @@
 - (BOOL)copyTable:(NSString *)tableName from:(NSString *)sourceDB to:(NSString *)targetDB withContent:(BOOL)copyWithContent
 {
 	// Copy the table structure
-	BOOL structureCopyResult = [self copyTable:tableName from:sourceDB to:targetDB];
+	BOOL structureCopySuccess = [self copyTable:tableName from:sourceDB to:targetDB];
 	
 	// Optionally copy the table data using an insert select
-	if (structureCopyResult && structureCopyResult && copyWithContent) {
+	if (structureCopySuccess && copyWithContent) {
 		
 		NSString *copyDataStatement = [NSString stringWithFormat:@"INSERT INTO %@.%@ SELECT * FROM %@.%@", 
 									   [targetDB backtickQuotedString],
@@ -80,12 +80,34 @@
 		
 		[connection queryString:copyDataStatement];		
 
-		if ([connection queryErrored]) return NO;
-		
-		return YES;
+		return ![connection queryErrored];
 	}
 	
-	return structureCopyResult;
+	return structureCopySuccess;
+}
+
+- (BOOL)copyTables:(NSArray *)tablesArray from:(NSString *)sourceDB to:(NSString *)targetDB withContent:(BOOL)copyWithContent
+{
+	BOOL success = YES;
+	
+	//disable foreign key checks
+	[connection queryString:@"/*!32352 SET foreign_key_checks=0 */"];
+	if([connection queryErrored]) 
+		success = NO;
+	
+	//copy tables
+	for(NSString *tableName in tablesArray) {
+		if(![self copyTable:tableName from:sourceDB to:targetDB withContent:copyWithContent])
+			success = NO;
+	}
+	
+	//enable foreign key checks
+	[connection queryString:@"/*!32352 SET foreign_key_checks=1 */"];
+	if([connection queryErrored]) 
+		success = NO;
+	
+	//done
+	return success;
 }
 
 - (BOOL)moveTable:(NSString *)tableName from:(NSString *)sourceDB to:(NSString *)targetDB