Save information from NSTextField in sqlite database (objective-c) - objective-c

Question

Since some months I am interested in coding. At the moment I am working on a programm which saves informations from textfields in a sqlite3 database. I am programming this project on Objective C in Xcode for Mac. Unfortunately I have problems in inserting data into my database. When I insert it and open my database in Terminal I just get this information in the cell for the string:
Here ist my code:
NSString *Bt = [NSString stringWithFormat:#"%#", Text]; //Theres a IBOutlet NSTextField *Text; in the Header data of the class
dbPath=#"/Users/Desktop/database.db";
if (sqlite3_open([dbPath UTF8String], &database)!=SQLITE_OK) {
sqlite3_close(database);
NSLog(#"Failed to open database");
} else {
char *errorMessage;
NSString *insertSQL = [NSString stringWithFormat:#"INSERT INTO table (table) VALUES (\"%#\")", Bt];
const char *insert_stmt = [insertSQL UTF8String];
if(sqlite3_exec(database, insert_stmt, NULL, NULL, &errorMessage)==SQLITE_OK){
NSLog(#"Data inserted");
[db_status setFloatValue:5];
}
}
}
It would be great if somebody can help me. I think it is just a small error but I don´t get the problem ;(
Best regards,
Robby

Answer 1

by the looks of your IBOUTLET connection, how you have your code, Bt is equal to the TextField. But what you want is the text value in the TextField. so you would use this: NSString *Bt = [NSString stringWithFormat:#"%#", Text.stringValue]; NSTextField has a property named stringValue and this will return the NSString that contains the value inside the textfield, Text.
Allowing Quotation Marks in Your Database
So easiest way, i can think of, is having a category method on NSString. So wherever you're going to save string or text from the user to your database, you would use this function to then insert into your format statement. and example shown below:
Header File of NSString Category
#interface NSString (STRING_)
/**
* Allowing Qoutation marks inside a string to be saved in a SQL column with the string format sourrounded by #"\"%#\"". this will not modify the string, only return a modified copy
* #return NSString *
*/
- (NSString *)reformatForSQLQuries;
#end
Implantation File of NSString Category
#implementation NSString (STRING_)
- (NSString *)reformatForSQLQuries {
NSString *string = self;
//Depending on how you "wrap" your strings to format the string values into your INSERT, UPDATE, or DELETE queries, you'll only have to use one of these statements. YOU DO NOT NEED BOTH
//Use this if you have your format as: '%#'
string = [string stringByReplacingOccurrencesOfString: #"'" withString: #"''"];
//Use this if you have your format as: \"%#\"
string = [string stringByReplacingOccurrencesOfString: #"\"" withString: #"\"\""];
return string;
}
example
...
NSString *insertSQL = [NSString stringWithFormat:#"INSERT INTO table (table) VALUES (\"%#\")", [Bt reformatForSQLQuries]];
...

Answer 2

I got the solution ! It´s false to write:
NSString *Bt = [NSString stringWithFormat:#"%#", Text];
The solution is to get the value from the NSTextField:
NSString *Bt = [NSTextField stringValue];
What I still don´t understand is why it´s not possible to save Strings which include this symbol: "". For example:
The database saves this: I like programming.
But not this: I like "programming".
Can somebody explain me why ?