added dump export method and project example

Author: misato

SQLiteManager.h

@@ -32,5 +32,6 @@ enum errorCodes {
 - (NSArray *) getRowsForQuery:(NSString *)sql;
 - (NSError *) closeDatabase;
 
+- (NSString *)getDatabaseDump;
 
 @end

SQLiteManager.m

@@ -146,7 +146,7 @@ - (NSArray *)getRowsForQuery:(NSString *)sql {
 
 	while (sqlite3_step(statement) == SQLITE_ROW) {
 		int columns = sqlite3_column_count(statement);
-		NSMutableDictionary *result = [[NSMutableDictionary alloc] initWithCapacity:1];
+		NSMutableDictionary *result = [[NSMutableDictionary alloc] initWithCapacity:columns];
 
 		for (int i = 0; i<columns; i++) {
 			const char *name = sqlite3_column_name(statement, i);	
@@ -178,7 +178,7 @@ - (NSArray *)getRowsForQuery:(NSString *)sql {
 				case SQLITE_BLOB:
 					break;
 				case SQLITE_NULL:
-					[result setObject:nil forKey:columnName];
+					[result setObject:[NSNull null] forKey:columnName];
 					break;
 
 				default:
@@ -200,6 +200,8 @@ - (NSArray *)getRowsForQuery:(NSString *)sql {
 	} //end while
 	sqlite3_finalize(statement);
 
+	[self closeDatabase];
+	
 	return resultsArray;
 
 }
@@ -215,17 +217,125 @@ - (NSError *) closeDatabase {
 
 	NSError *error = nil;
 
-	if (sqlite3_close(db) != SQLITE_OK){
-		const char *errorMsg = sqlite3_errmsg(db);
-		NSString *errorStr = [NSString stringWithFormat:@"The database could not be closed: %@",[NSString stringWithCString:errorMsg encoding:NSUTF8StringEncoding]];
-		error = [self createDBErrorWithDescription:errorStr andCode:kDBFailAtClose];
-	}
 
-	db = nil;
+	if (db != nil) {
+		if (sqlite3_close(db) != SQLITE_OK){
+			const char *errorMsg = sqlite3_errmsg(db);
+			NSString *errorStr = [NSString stringWithFormat:@"The database could not be closed: %@",[NSString stringWithCString:errorMsg encoding:NSUTF8StringEncoding]];
+			error = [self createDBErrorWithDescription:errorStr andCode:kDBFailAtClose];
+		}
+		
+		db = nil;
+	}
 
 	return error;
 }
 
+
+/**
+ * Creates an SQL dump of the database.
+ *
+ * This method could get a csv format dump with a few changes. 
+ * But i prefer working with sql dumps ;)
+ *
+ * @return an NSString containing the dump.
+ */
+
+- (NSString *)getDatabaseDump {
+	
+	NSMutableString *dump = [[NSMutableString alloc] initWithCapacity:256];
+	
+	// info string ;) please do not remove it
+	[dump appendString:@";\n; Dump generated with SQLiteManager4iOS \n;\n; By Misato (2011)\n"];
+	[dump appendString:[NSString stringWithFormat:@"; database %@;\n", databaseName]];
+	
+	// first get all table information
+	
+	NSArray *rows = [self getRowsForQuery:@"SELECT * FROM sqlite_master WHERE type='table' AND name NOT LIKE 'sqlite_%';"];
+	// last sql query returns something like:
+	// {
+	// name = users;
+	// rootpage = 2; 
+	// sql = "CREATE TABLE users (id integer primary key autoincrement, user text, password text)";
+	// "tbl_name" = users;
+	// type = table;
+	// }
+	
+	//loop through all tables
+	for (int i = 0; i<[rows count]; i++) {
+		
+		NSDictionary *obj = [rows objectAtIndex:i];
+		//get sql "create table" sentence
+		NSString *sql = [obj objectForKey:@"sql"];
+		[dump appendString:[NSString stringWithFormat:@"%@;\n",sql]];
+
+		//get table name
+		NSString *tableName = [obj objectForKey:@"name"];
+
+		//get all table content
+		NSArray *tableContent = [self getRowsForQuery:[NSString stringWithFormat:@"SELECT * FROM %@",tableName]];
+		
+		for (int j = 0; j<[tableContent count]; j++) {
+			NSDictionary *item = [tableContent objectAtIndex:j];
+			
+			//keys are column names
+			NSArray *keys = [item allKeys];
+			
+			//values are column values
+			NSArray *values = [item allValues];
+			
+			//start constructing insert statement for this item
+			[dump appendString:[NSString stringWithFormat:@"insert into %@ (",tableName]];
+			
+			//loop through all keys (aka column names)
+			NSEnumerator *enumerator = [keys objectEnumerator];
+			id obj;
+			while (obj = [enumerator nextObject]) {
+				[dump appendString:[NSString stringWithFormat:@"%@,",obj]];
+			}
+			
+			//delete last comma
+			NSRange range;
+			range.length = 1;
+			range.location = [dump length]-1;
+			[dump deleteCharactersInRange:range];
+			[dump appendString:@") values ("];
+			
+			// loop through all values
+			// value types could be:
+			// NSNumber for integer and floats, NSNull for null or NSString for text.
+			
+			enumerator = [values objectEnumerator];
+			while (obj = [enumerator nextObject]) {
+				//if it's a number (integer or float)
+				if ([obj isKindOfClass:[NSNumber class]]){
+					[dump appendString:[NSString stringWithFormat:@"%@,",[obj stringValue]]];
+				}
+				//if it's a null
+				else if ([obj isKindOfClass:[NSNull class]]){
+					[dump appendString:@"null,"];
+				}
+				//else is a string ;)
+				else{
+					[dump appendString:[NSString stringWithFormat:@"'%@',",obj]];
+				}
+				
+			}
+			
+			//delete last comma again
+			range.length = 1;
+			range.location = [dump length]-1;
+			[dump deleteCharactersInRange:range];
+			
+			//finish our insert statement
+			[dump appendString:@");\n"];
+			
+		}
+		
+	}
+	return dump;
+}
+
 @end
 
 

SQLiteManagerExample/Classes/UntitledAppDelegate.h

@@ -0,0 +1,22 @@
+//
+//  UntitledAppDelegate.h
+//  Untitled
+//
+//  Created by Ester Sanchez on 10/03/11.
+//  Copyright 2011 Dinamica Studios. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@class UntitledViewController;
+
+@interface UntitledAppDelegate : NSObject <UIApplicationDelegate> {
+    UIWindow *window;
+    UntitledViewController *viewController;
+}
+
+@property (nonatomic, retain) IBOutlet UIWindow *window;
+@property (nonatomic, retain) IBOutlet UntitledViewController *viewController;
+
+@end
+

SQLiteManagerExample/Classes/UntitledAppDelegate.m

@@ -0,0 +1,88 @@
+//
+//  UntitledAppDelegate.m
+//  Untitled
+//
+//  Created by Ester Sanchez on 10/03/11.
+//  Copyright 2011 Dinamica Studios. All rights reserved.
+//
+
+#import "UntitledAppDelegate.h"
+#import "UntitledViewController.h"
+
+@implementation UntitledAppDelegate
+
+@synthesize window;
+@synthesize viewController;
+
+
+#pragma mark -
+#pragma mark Application lifecycle
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
+    
+    // Override point for customization after application launch.
+
+    // Add the view controller's view to the window and display.
+    [self.window addSubview:viewController.view];
+    [self.window makeKeyAndVisible];
+
+    return YES;
+}
+
+
+- (void)applicationWillResignActive:(UIApplication *)application {
+    /*
+     Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
+     Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
+     */
+}
+
+
+- (void)applicationDidEnterBackground:(UIApplication *)application {
+    /*
+     Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later. 
+     If your application supports background execution, called instead of applicationWillTerminate: when the user quits.
+     */
+}
+
+
+- (void)applicationWillEnterForeground:(UIApplication *)application {
+    /*
+     Called as part of  transition from the background to the inactive state: here you can undo many of the changes made on entering the background.
+     */
+}
+
+
+- (void)applicationDidBecomeActive:(UIApplication *)application {
+    /*
+     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
+     */
+}
+
+
+- (void)applicationWillTerminate:(UIApplication *)application {
+    /*
+     Called when the application is about to terminate.
+     See also applicationDidEnterBackground:.
+     */
+}
+
+
+#pragma mark -
+#pragma mark Memory management
+
+- (void)applicationDidReceiveMemoryWarning:(UIApplication *)application {
+    /*
+     Free up as much memory as possible by purging cached data objects that can be recreated (or reloaded from disk) later.
+     */
+}
+
+
+- (void)dealloc {
+    [viewController release];
+    [window release];
+    [super dealloc];
+}
+
+
+@end

SQLiteManagerExample/Classes/UntitledViewController.h

@@ -0,0 +1,26 @@
+//
+//  UntitledViewController.h
+//  Untitled
+//
+//  Created by Ester Sanchez on 10/03/11.
+//  Copyright 2011 Dinamica Studios. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "SQLiteManager.h"
+
+
+@interface UntitledViewController : UIViewController {
+
+	SQLiteManager *dbManager;
+	
+	IBOutlet UITextView *textView;
+}
+
+@property (nonatomic, retain) IBOutlet UITextView *textView;
+
+- (IBAction) addTable;
+- (IBAction) addUser;
+
+@end
+