soliproxy.blogg.se - Sqlite transaction

#SQLITE TRANSACTION HOW TO#
#SQLITE TRANSACTION UPDATE#

SQLite is the most widely deployed SQL database engine in the world. To start a transaction explicitly, you use the following steps:įirst, open a transaction by issuing the BEGIN TRANSACTION command. React Native SQLite is a library that implements a self-contained, serverless, zero-configuration, transactional SQL database engine. It means that for each command, SQLite starts, processes, and commits the transaction automatically. On the contrary, if the program crashes before the transaction is committed, the change should not persist.īy default, SQLite operates in auto-commit mode. Durable: if a transaction is successfully committed, the changes must be permanent in the database regardless of the condition such as power failure or program crash.On the other hand, the changes committed by other sessions after the transaction started should not be visible to the current session.

#SQLITE TRANSACTION UPDATE#

When a session starts a transaction and executes the INSERT or UPDATE statement to change the data, these changes are only visible to the current session, not others.

Isolation: a pending transaction performed by a session must be isolated from other sessions.

However, when the transaction is committed or rolled back, it is important that the transaction must keep the database consistent. When a transaction starts and executes a statement to modify data, the database becomes inconsistent.

Consistent: a transaction must ensure to change the database from one valid state to another.

When you commit a transaction, either the entire transaction is applied or not. It means that a change cannot be broken down into smaller ones. BEGIN TRANSACTION CREATE TABLE test (i integer) INSERT INTO test VALUES(99) COMMIT. Subsequent executions will reuse the compilation of the first one. To get optimal performance when inserting or updating data, ensure that you do the following: Use a transaction.

Atomic: a transaction should be atomic. SQLite doesn't have any special way to bulk insert data.

SQLite guarantees all the transactions are ACID compliant even if the transaction is interrupted by a program crash, operation system dump, or power failure to the computer. SQLite is a transactional database that all changes and queries are atomic, consistent, isolated, and durable (ACID).

#SQLITE TRANSACTION HOW TO#

Summary: in this tutorial, we will show you how to use the SQLite transaction to ensure the integrity and reliability of the data.