how to check data in sqlite table using primary ID [closed] - ios

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Closed 9 years ago.
I create one application that use sqlite DB in it.
I have one problem and it is any time run my application add NSDictionary in my table sqlite. I want once check sqlite and if data exist in table sqlite not add else add it.
this my code:
ViewController.h
#import <UIKit/UIKit.h>
#import "sqlite3.h"
#interface ViewController : UIViewController
{
sqlite3 * database;
}
#end
ViewController.m
#import "ViewController.h"
#define DatabaseName #"data.sqlite"
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
NSArray *idd = [NSArray arrayWithObjects:#"122",#"234",#"453", nil];
NSArray *name = [NSArray arrayWithObjects:#"janatan",#"fred",#"john", nil];
NSArray *age = [NSArray arrayWithObjects:#"23",#"35",#"12", nil];
NSArray *sex = [NSArray arrayWithObjects:#"male",#"male",#"male", nil];
for (int i = 0; i < [idd count]; i++)
{
NSString * a = [idd objectAtIndex:i];
NSString * b = [name objectAtIndex:i];
NSString * c = [age objectAtIndex:i];
NSString * d = [sex objectAtIndex:i];
NSDictionary * dic = [NSDictionary dictionaryWithObjectsAndKeys:a,#"id",b,#"name",c,#"age",d,#"sex", nil];
NSString *query = [NSString stringWithFormat:#"insert into table1 (id,name,age,sex) values('%#','%#','%#','%#')",[dic objectForKey:#"id"],[dic objectForKey:#"name"],[dic objectForKey:#"age"],[dic objectForKey:#"sex"]];
NSLog(#"%#",query);
[self executeQuery:query];
}
}
-(NSString *) dataFilePath
{
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSLog(#"PATH %#",[documentsDirectory stringByAppendingPathComponent:DatabaseName]);
return [documentsDirectory stringByAppendingPathComponent:DatabaseName];
}
/*==================================================================
METHOD FOR INSERTING DATA IN DATABASE
==================================================================*/
-(void)executeQuery:(NSString *)query
{
//NSLog(#"QUERY : %#",query);
sqlite3_stmt *statement;
if(sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK)
{
if (sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, NULL) == SQLITE_OK)
{
if (sqlite3_step(statement) != SQLITE_DONE)
{
sqlite3_finalize(statement);
}
}
else
{
NSLog(#"query Statement Not Compiled");
}
sqlite3_finalize(statement);
sqlite3_close(database);
}
else
{
NSLog(#"Data not Opened");
}
}
#end
also I want when NSDictionary changed for example arrays is Dictionary increase value update sqlite complete.
please explain me .

Answer 1

Use this method :
/*==================================================================
METHOD FOR CHECKING WHETHER RECORD EXISTS OR NOT IN DATABASE
==================================================================*/
-(BOOL)recordExistOrNot:(NSString *)query{
BOOL recordExist=NO;
if(sqlite3_open([[self dataFilePath] UTF8String], &database) == SQLITE_OK)
{
sqlite3_stmt *statement;
if (sqlite3_prepare_v2(database, [query UTF8String], -1, &statement, nil)==SQLITE_OK)
{
if (sqlite3_step(statement)==SQLITE_ROW)
{
recordExist=YES;
}
else
{
//////NSLog(#"%s,",sqlite3_errmsg(database));
}
sqlite3_finalize(statement);
sqlite3_close(database);
}
}
return recordExist;
}
It will return YES if record exists else not.
Ex :
NSString *query = [NSString stringWithFormat:#"select * from yourtable where column_name = 'column_name'"];
NSLog(#"query : %#",query);
BOOL recordExist = [self recordExistOrNot:query];
if (!recordExist) {
// Insert your data
}
Hope it helps you.