how to check item already exits in sqlite objective c - ios

Question

This the my code
NSString *query1 =[NSString stringWithFormat:#"select * from table name where item_name=%#",trimmedString];
// [self.dbManager executeQuery:query1];
// -(void)runQuery:(const char *)query isQueryExecutable:(BOOL)queryExecutable
NSLog(#"q1--%#",query1);
BOOL recordExist = [self.dbManager recordExistOrNot:query1];
NSLog(#"------%d",recordExist);
if (!recordExist)
{
NSString *query;
if (self.recordIDToEdit == -1) {
query = [NSString stringWithFormat:#"insert into c values(null,'%#','%d','%d',%d)",item_name.text,a,p,c];
NSLog(#"query---%#",query);
}
// Execute the query.
[self.dbManager executeQuery:query];
// If the query was successfully executed then pop the view controller.
if (self.dbManager.affectedRows != 0) {
NSLog(#"Query was executed successfully. Affected rows = %d", self.dbManager.affectedRows);
// UIAlertView *alert=[[UIAlertView alloc]initWithTitle:Nil message:#"Successfully Added to The Cart" delegate:Nil cancelButtonTitle:#"ok" otherButtonTitles:Nil, nil];
// [alert show];
[self loadData];
}
else{
NSLog(#"Could not execute the query.");
}
}
else
{
NSLog(#"item already exits....");
}
- (BOOL)recordExistOrNot:(NSString *)query1{
sqlite3 *sqlite3Database;
NSString *databasePath = [self.documentsDirectory stringByAppendingPathComponent:self.databaseFilename];
sqlite3_stmt *compiledStatement;
BOOL recordExist=NO;
if(sqlite3_open([databasePath UTF8String], &sqlite3Database) == SQLITE_OK)
{
// sqlite3_stmt *statement;
if (sqlite3_prepare_v2(sqlite3Database,[query1 UTF8String], -1, &compiledStatement, NULL)==SQLITE_OK)
{
if (sqlite3_step(compiledStatement)==SQLITE_ROW)
{
recordExist=YES;
}
else
{
//////NSLog(#"%s,",sqlite3_errmsg(database));
}
sqlite3_finalize(compiledStatement);
sqlite3_close(sqlite3Database);
}
}
return recordExist;
}
actually i want to be check string value in the table like "select * from table name where item_name=tea"
but this code is checking integer value but i want check string value.please help me

Answer 1

You are missing the single quotes in you select statement. first line.
NSString *query1 =[NSString stringWithFormat:#"select * from table name where item_name=%#",trimmedString];
to
NSString *query1 =[NSString stringWithFormat:#"select * from table name where item_name='%#'",trimmedString];

Answer 2

i'll assume that item_name is unique then you might be better served with doing insert or ignore.
i.e.
insert or ignore into tablename (item_name) values ('something')
thsi will ignore doing the insert if that value for your key exists