How compare data from database? [closed] - iphone

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Closed 9 years ago.
I have create a database. In my view i am checking provided dat is already exist or not. If exist then retrun Yes otherwise no. for this i have use this code..
+(BOOL)compareDataInDB:(NSString *)Start_text EndAddress:(NSString *)End_text Categories:(NSString *)Category_text{
BOOL flag=FALSE;
if(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK) {
//int LastId="select Max(place_id) from Places";
// NSLog(#"%i",LastId);
const char *sql = "select * from Places where Start_text = Start_text and End_text = End_text and Category_text = Category_text";
sqlite3_stmt *stmt;
int rtnVal = sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);
if( rtnVal == SQLITE_OK) {
while (sqlite3_step(stmt) == SQLITE_ROW) {
flag=TRUE;
}
}
sqlite3_finalize(stmt);
}
sqlite3_close(db);
if(flag==TRUE)
return YES;
else
return NO;
}
on button action i have use this code
-(IBAction)Find{
BOOL tmp=[GlobalClass compareDataInDB:txtstart.text EndAddress:txtend.text Categories:txtCategory.text];
if(tmp)
[GlobalClass storeDataInDB:txtstart.text EndAddress:txtend.text Categories:txtCategory.text];
else
NSLog(#"exsit data in database");
}
Now problem is that it always return no. What is error in this code? And How make compression in data from data base?
Thanks in advance...

Answer 1

You have to use following code for SQL Statement.
NSString *tempSQL = [[NSString alloc] initWithFormat:#"select * from Places where Start_text = '%#' and End_text = '%#' and Category_text = '%#'", Start_text, Start_text, Category_text];
const char *sql = [tempSQL cStringUsingEncoding:NSUTF8StringEncoding];
[tempSQL release];

Answer 2

+(BOOL)compareDataInDB:(NSString *)Start_text EndAddress:(NSString *)End_text Categories:NSString *)Category_text
{
BOOL flag=NO;
if(sqlite3_open([dbPath UTF8String], &db) == SQLITE_OK) {
//int LastId="select Max(place_id) from Places";
// NSLog(#"%i",LastId);
const char *sql = "select * from Places where Start_text = Start_text and End_text = End_text and Category_text = Category_text";
sqlite3_stmt *stmt;
int rtnVal = sqlite3_prepare_v2(db, sql, -1, &stmt, NULL);
if( rtnVal == SQLITE_OK)
{
sqlite3_bind_text(stmt, 1, [Start_text UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 2, [End_text UTF8String], -1, SQLITE_TRANSIENT);
sqlite3_bind_text(stmt, 3, [Category_text UTF8String], -1, SQLITE_TRANSIENT);
while (sqlite3_step(stmt) == SQLITE_ROW) {
flag=YES;
}
}
sqlite3_finalize(stmt);
}
sqlite3_close(db);
return flag;
}