Query is not retrieving the data from table - iphone

Question

im trying to integrate a database into my project.This is for first time im implementing a database project.I integrated the database into my project.Database has 3 columns named rowid,col1,col2.Below code i used for acessing the datafrom database.But it is not enetering in "if loop"Can anyone help me where im doing wrong in this case.Thanks in advance.![enter image description here][1]
/* -(void)print
{
sqlite3_stmt *statement;
qsql=[NSString stringWithFormat:#"SELECT * from light where rowid = '%d'",1];
if(sqlite3_prepare_v2(database, [qsql UTF8String], -1, &statement, NULL) == SQLITE_OK) {
NSLog(#"hhhhhhhhh");
while (sqlite3_step(statement) == (SQLITE_ROW)){
NSString *Q_NO = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
// tv.text=qsql;
}
}}*/
-(void)print
{
sqlite3_stmt *statement;
//qsql=[NSString stringWithFormat:#"SELECT * from light where rowid = %d",1];
qsql=[NSString stringWithFormat:#"SELECT * from light where rowid = %i",1];
//const char *sqlStatement = [qsql cStringUsingEncoding:NSUTF8StringEncoding];
const char *qsql_stament = [qsql cStringUsingEncoding:NSUTF8StringEncoding];
if(sqlite3_prepare_v2(database, qsql_stament, -1, &statement, NULL) == SQLITE_OK) {
NSLog(#"hhhhhhhhh");
while (sqlite3_step(statement) == (SQLITE_ROW)){
// NSString *Q_NO = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
NSString *Q_NO = [[NSString alloc] initWithString:[NSString stringWithFormat:#"%i",sqlite3_column_int(statement, 0)]];
// tv.text=qsql;
}
}
}
-(void) checkAndCreateDatabase{
BOOL success;
NSFileManager *fileManager = [NSFileManager defaultManager];
success = [fileManager fileExistsAtPath:databasePath];
if(success) return;
NSString *databasePathFromApp = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:databaseName];
[fileManager copyItemAtPath:databasePathFromApp toPath:databasePath error:nil];
[fileManager release];
}
-(void) openDB {
databaseName = #"Lighthr.sqlite";
NSArray *documentsPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDir = [documentsPaths objectAtIndex:0];
databasePath = [documentDir stringByAppendingPathComponent:databaseName];
[self checkAndCreateDatabase];
if(sqlite3_open([databasePath UTF8String],&database) == SQLITE_OK){
NSLog(#"coming here???");
}
}
[1]: http://i.stack.imgur.com/lm1ZV.png

Answer 1

because rowid is always integer and you are trying to access using string.
I thing you have to try this.
Edit
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) {
qsql=[NSString stringWithFormat:#"SELECT * from light where rowid = %i",1];
const char *sqlStatement = [qsql cStringUsingEncoding:NSUTF8StringEncoding];
if(sqlite3_prepare_v2(database, sqlStatement, -1, &statement, NULL) == SQLITE_OK) {
NSLog(#"hhhhhhhhh");
while (sqlite3_step(statement) == (SQLITE_ROW)){
NSString *Q_NO = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
// tv.text=qsql;
}
}
}

Answer 2

Are you trying to test without your "where" clause ?
And what is the error code return by sqlite3_prepare_v2 ?
int sql_answer = sqlite3_prepare_v2(database, qsql_stament, -1, &statement, NULL);
NSLog(#" SQL answer : %d",sql_answer );
if(sql_answer == SQLITE_OK) {
...

Answer 3

i think you should do in this way .
-(void)print
{
sqlite3_stmt *statement;
qsql=[NSString stringWithFormat:#"SELECT * from light where rowid = %d",1];
const char *qsql_stament = [qsql cStringUsingEncoding:NSUTF8StringEncoding];
if(sqlite3_prepare_v2(database, qsql_stament, -1, &statement, NULL) == SQLITE_OK) {
NSLog(#"hhhhhhhhh");
while (sqlite3_step(statement) == (SQLITE_ROW)){
NSString *Q_NO =[NSString stringWithUTF8String:(char *)sqlite3_column_text(statement, 0)]
}

Answer 4

NSString *Q_NO = [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(statement, 0)];
above stameny replace with below statement
NSString *Q_NO = [[NSString alloc] initWithString:[NSString stringWithFormat:#"%i",sqlite3_column_int(statement, 0)]];
and
const char *qsql_stament = [qsql cStringUsingEncoding:NSUTF8StringEncoding];
now replace [qsql UTF8String] with qsql_stament. It will work fine.