how to retrieve the multiple columns data from the database? - iphone

Question

I am new to this database programming.i retrieved single column data from the database.but i am unable to retrieve multiple columns data from the database.
here is my code
-(void) readItemsFromDatabaseforTable:(NSString *)tableName {
arrayItems = [[NSMutableArray alloc] init];
if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK)
{
NSString *sql_str = [NSString stringWithFormat:#"select * from %#", tableName];
const char *sqlStatement = (char *)[sql_str UTF8String];
NSLog(#"query %s",sqlStatement);
sqlite3_stmt *compiledStatement;
if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK)
{
while(sqlite3_step(compiledStatement) == SQLITE_ROW) {
NSString *idsstr = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];
[arrayItems addObject:idsstr];
NSLog(#"*************** %#",arrayItems);
}
while(sqlite3_step(compiledStatement) == SQLITE_ROW)
{
NSString *caloriesstr = [NSString stringWithUTF8String:
(char*)sqlite3_column_text(compiledStatement, 4)];
[caloriesarry addObject:caloriesstr];
NSLog(#"naveenkumartesting");
NSLog(#"*************** %#",caloriesarry);
}
}
my main aim is to retrieve columns data from the database and store into multiple arrays.
please guys anyone help me,

Answer 1

You dont need to loop with while a second time when you can get all data in a single while as so:
const char *stmt = "select id, name from table1 where isImage = 1";
sqlite3_stmt *selectstmt;
if (sqlite3_prepare_v2(database, stmt, -1, &selectstmt, NULL) == SQLITE_OK) {
while(sqlite3_step(selectstmt) == SQLITE_ROW) {
int rowid = sqlite3_column_int(selectstmt, 0);
NSString * name = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)];
}
}

Answer 2

Use this sample Query and make your query according to your requirements..
NSString *str = [NSString stringWithFormat:#"Select * from Yourtablename where image1 = '%#' AND person1 = '%#' AND category = '%#' AND PurchaseAmt = '%#'",Str,person1,category,Amountdata];
Use this tutorial