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POsql and UIPickerView
 

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  1. POsql and UIPickerView
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    <p>I need to develop a sql statement based on values picked on a UIPickerView. If you need a visual idea, here's a <a href="http://www.corinnpope.com/?attachment_id=1044" rel="nofollow">link</a> to the screenshot (sorry not enough reputation to post pics yet) . I haven't been able to find any documentation on this and want to make sure I'm on the right track before I dig into it. </p> <p>Each component (kTypeComponent, kDifficultyComponent, kDescriptionComponent) has three rows to select from (ex. kTypeComponent row1=bike, row2=run, row3=swim)</p> <p>My thought would be that the sql statement would look something like this</p> <pre><code> sqlite3_stmt *pickerStatement; //This would give back a string of the row selected (i.e bike, run, swim) NSInteger getTypeSelected = [pickerView selectedRowInComponent:kTypeComponent]; NSString typeSQL = [rowOneItems objectAtIndex:getTypeSelected]; const char *pickerSQL = "SELECT description FROM workoutTbl WHERE (type = typeSQL) AND ... </code></pre> <p>Is this possible to do with a sql statement? I'm only familiar with basic SQL, so I'm not sure </p> <p>Would the SQL statement go in the action (button) or where I set up my NSMutableArray and open the database? Should it go into a different class? </p> <p><strong>Edit - Solution</strong></p> <p>In case anyone comes around with the same problem, here is the solution to it</p> <pre><code> - (NSArray *)getWorkoutListwithType:(NSString *)workoutType withDifficulty:(NSString *)difficulty withLength:(NSString *)length { NSMutableArray *workouts; @try { NSFileManager *fileMgr = [NSFileManager defaultManager]; NSString *dbPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"workoutList.sqlite"]; // NSLog(@"Db path is %@",dbPath); BOOL success = [fileMgr fileExistsAtPath:dbPath]; if (!success){ NSLog(@"Cannot locate database file '%@'.", dbPath); } if (!(sqlite3_open([dbPath UTF8String], &amp;db) == SQLITE_OK)) { NSLog(@"error with message '%s'.", sqlite3_errmsg(db)); } // only alloc/init the array if the SQL database opens properly workouts = [[NSMutableArray alloc] init]; sqlite3_stmt *sqlStatement; // add "%%" as a wildcard so the query will say "difficulty LIKE '&gt;30%' and match &gt;30 MINS, &gt;30 HOURS, etc. NSString *sqlString = [NSString stringWithFormat: @"SELECT description FROM workoutTbl WHERE type LIKE '%@%%' AND difficulty LIKE '%@%%' AND duration LIKE '%@%%'", workoutType, difficulty, length]; NSLog(@"query: %@", sqlString); const char *sql = [sqlString UTF8String]; if (sqlite3_prepare(db, sql, -1, &amp;sqlStatement, NULL) != SQLITE_OK) { NSLog(@"%s Prepare failure '%s' (%1d)", __FUNCTION__, sqlite3_errmsg(db), sqlite3_errcode(db)); } while (sqlite3_step(sqlStatement)==SQLITE_ROW) { [workouts addObject:[NSString stringWithUTF8String:(char *) sqlite3_column_text(sqlStatement,0)]]; } sqlite3_finalize(sqlStatement); } @catch (NSException *exception) { NSLog(@"An exception occured: %@", [exception reason]); } @finally { sqlite3_close(db); } // Pass back an immutable copy of the array. if the array is nil, then the database never opened and there will be an error return [workouts copy]; </code></pre> <p>}</p>
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