how can i update sqlite database - iphone

Question

I want to update records from several textfiels in detail viewcontroller, but when I cliCk on update button, its goes to failed to update database. pls suggest me.
-(IBAction)updateQuery:(id)sender
{
sqlite3_stmt *statement;
const char *dbpath = [databasePath UTF8String];
if (sqlite3_open(dbpath, &Information) == SQLITE_OK)
{
NSString *updateSQL = [NSString stringWithFormat: #"update CONTACTS set address=\"%#\",phone=\"%#\",imageUrl=\"%#\" WHERE name=\"%#\"",daddress.text,dphone.text,durl.text,dname.text];
const char *update_stmt = [updateSQL UTF8String];
sqlite3_prepare_v2(Information, update_stmt, -1, &statement, NULL);
if (sqlite3_step(statement) == SQLITE_DONE)
{
dstatuslabel.text=#"updated successfully";
}
else
{
dstatuslabel.text = #"Failed to update contact";
}
sqlite3_finalize(statement);
sqlite3_close(Information);
}
}

Answer 1

NSString *updateSQL = [NSString stringWithFormat: #"update CONTACTS set address='%#',phone='%#',imageUrl='%#' WHERE name='%#'",daddress.text,dphone.text,durl.text,dname.text];

Answer 2

In my method i use following way its working :
-(BOOL)updateProfileFromCreatorId:(int)creatorProfileId{
char *st,*errorMsg;
NSLog(#"profile.creatorProfileId:%d",creatorProfileId);
st = sqlite3_mprintf("UPDATE Profile SET `CreatorID`=%d WHERE `CreatorID`= 1"
,creatorProfileId //username
);
NSLog(#"updateQUERY: %#",[NSString stringWithUTF8String:st]);
int ret = sqlite3_exec(rlraDb, st, NULL, NULL, &errorMsg);
if (ret != SQLITE_OK) {
sqlite3_free(errorMsg);
sqlite3_free(st);
return NO;
}
sqlite3_free(st);
return YES;
}

Answer 3

Add the Sqlite DB like any other file in your application bundle
Copy it to documents directory via code and use it (Method :checkAndCreateDatabase ) .The purpose of this is that updating content in sqlite is possible in Documents directory only
-(void) checkAndCreateDatabase
{
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;
// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];
// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:_databasePath];
// If the database already exists then return without doing anything
if(success) return;
// If not then proceed to copy the database from the application to the users filesystem
// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:_databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:_databasePath error:nil];
}
- (id)init {
if ((self = [super init]))
{
_databaseName = DB_NAME;
NSArray *documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDir = [documentPaths objectAtIndex:0];
_databasePath = [documentsDir stringByAppendingPathComponent:_databaseName];
if (sqlite3_open([[self dbPath] UTF8String], &_database) != SQLITE_OK)
{
[[[UIAlertView alloc]initWithTitle:#"Missing"
message:#"Database file not found"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil, nil]show];
}
}
return self;
}

Answer 4

Try this...It should work...
1) Please make sure you are copying the db from your bundle to documents directory before updating the db...
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsPath = [paths objectAtIndex:0];
NSString *filePath = [documentsPath stringByAppendingPathComponent:#"YOUR DBNAME.sqlite"];
// Check if the SQL database has already been saved to the users phone, if not then copy it over
BOOL success;
// Create a FileManager object, we will use this to check the status
// of the database and to copy it over if required
NSFileManager *fileManager = [NSFileManager defaultManager];
// Check if the database has already been created in the users filesystem
success = [fileManager fileExistsAtPath:filePath];
// If the database already exists then return without doing anything
if(success) return;
// If not then proceed to copy the database from the application to the users filesystem
// Get the path to the database in the application package
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:_databaseName];
// Copy the database from the package to the users filesystem
[fileManager copyItemAtPath:databasePathFromApp toPath:_databasePath error:nil];
}
2)Step 2: Update
sqlite3 *database;
sqlite3_stmt *updateStmt=nil;
const char *dbpath = [filePath UTF8String];
if (sqlite3_open(dbpath, &database) == SQLITE_OK)
{
NSString *updateSQL = [NSString stringWithFormat: #"update CONTACTS set address=\"%#\",phone=\"%#\",imageUrl=\"%#\" WHERE name=\"%#\"",daddress.text,dphone.text,durl.text,dname.text];
const char *insert_stmt = [insertSQL UTF8String];
sqlite3_prepare_v2(database, insert_stmt,-1, &updateStmt, NULL);
if (sqlite3_step(updateStmt) == SQLITE_DONE)
{
NSLog(#"updated");
}
}