Nowadays, many applications use databases for data management. Using the application, the user can delete, update and add information to the data. In this article, we are going to get to know one of the Android databases and about the database. In Android SQLite database in Android, let’s talk about the most important features of SQLite and building a database in Android using SQLite.
Table of Contents
What is a database in Android?
It is a set of data and information that is stored in a computer system that is available and can manage, modify, update, control, and organize and is organized according to a specific data model, most of the databases use SQL language. One of the applications of the Merit database is information in applications and software. The database can have several tables, each table stores information related to a subject.
SQLite database on Android
SQLite is an information management program based on the SQL language. SQLite is the most widely used database engine in the world. SQLite is built into all cell phones and most computers, and it’s inside countless other applications that people use every day. Stores information for a text file on the device is a compact library.
With all features enabled, depending on the target operating system and compiler optimization settings, the library size can be less than 600KiB. It is a library written in c language, available on ios and android platforms, and also supported by windows. Kend is lighter than SQL.
SQLite supports all the features of a relational database. To access this database, you do not need to create any kind of connection for it such as JDBC, ODBC, etc. SQLite can be stored on disk and memory and has a very good speed. The SQLite database file can be used cross-platform. SQLite It uses SQLite and SQLite open helper to communicate with the operating system. Coding in the SQLite environment is very simple. SQLite does not need to be installed and configured. It is also free.
The most important features of SQLite
Transactional
A transactional database is a database in which all changes and representations of data are atomic, consistent, isolated, and durable (ACID). Even if the transaction is interrupted due to program failure, operating system failure, or power failure on the computer. All changes in a transaction in SQLite either happen completely or not at all, even if the act of writing the disk change is interrupted, the database returns to the state it had before the transaction, and thus, changes are not made on an incomplete database.
Zero configuration
No need to set up and manage, SQLite does not need to be “installed” before use. There is no “setup” routine. There are no server processes that need to be started, stopped, or configured. An administrator no longer needs to create a new database instance or assign access permissions to users. SQLite does not use any configuration files. Nothing needs to be done to tell the system that SQLite is running. After a system crash or power outage, no recovery action is required. Nothing to troubleshoot. SQLite just works. Other database engines may work fine. But doing the initial installation and configuration can often be intimidating.
Serverless
Most SQL database engines run as a separate process from the server. Programs that want to access the database communicate with the server using some form of inter-process communication (usually TCP/IP) to send requests to the server and receive results back. SQLite does not work this way. With SQLite, the process that wants to access the database reads and writes directly from the database files on disk, there are no intermediary server processes.
Most SQL database engines are client/server based. Of the serverless ones, SQLite is the only database that allows multiple applications to access the same database at the same time.
Self-Contained
It has no external affiliation. SQLite is independent in that it has very few dependencies. SQLite does not use any external libraries or interfaces (other than a few standard C library calls described below). The entire SQLite library is contained in a single source code file that does not require any special facilities or tools to build.
Building SQLite requires only these routines from the C standard library:
memcmp(), memcpy(), memmove(), memset(), strcmp(), strlen(), strncmp
In most of the constructions, special system memory routines are used: (malloc()), realloc(), free
But these routines are optional and can be removed using compile time option.
SQLite’s default structures contain VFS objects suitable for communicating with the host operating system, and these VFS objects contain operating system calls such as open(), read(), write(), fsync, etc. All of these interfaces are readily available on most operating systems, and custom VFSs can be designed to run SQLite on even the most demanding embedded devices.