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Learning SQLite for iOS

You're reading from  Learning SQLite for iOS

Product type Book
Published in Mar 2016
Publisher
ISBN-13 9781785288975
Pages 154 pages
Edition 1st Edition
Languages
Author (1):
Gene Da Rocha Gene Da Rocha
Profile icon Gene Da Rocha
Toc

Table of Contents (15) Chapters close

Learning SQLite for iOS
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
1. Introduction to SQL and SQLite 2. Database Design Concepts 3. Administering the Database 4. Essentials of SQL 5. Exposing the C API 6. Using Swift with iOS and SQLite 7. iOS Development with PhoneGap and HTML5 8. More Features and Advances in SQLite Index

SQL in iOS


To select data, methods like executeQuery can be used to return the FMResultSet object if successful, or 0 upon failure. There are methods, such as lastErrorMessage or lastErrorcode, to find out if the query has worked or failed:

FMResultSet *s = [db executeQuery:@"SELECT * FROM aTable"]; while ([s next]) {     //retrieve values for each record }

For multiple rows, [FMResultSet next] must be used to see or read the values returned from the query, even if the recordset is one, for example.

The following command shows how to use FMResultSet to select multiple queries as required:

FMResultSet *s = [db executeQuery:@"SELECT COUNT(*) FROM aTable"]; if ([s next]) {     int totalCount = [s intForColumnIndex:0]; }

FrmresultSet offers several methods to the programmer to retrieve; some examples are as follows:

  • intForColumn:

  • longForColumn:

  • longLongIntForColumn:

Some of the aforementioned methods by default will have the {type}ForColumnIndex: variant, which will be used to get the data based on the...

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