TheDeveloperBlog.com
C-Sharp | Java | Python | Swift | GO | WPF | Ruby | Scala | F# | JavaScript | SQL | PHP | Angular | HTML
SQLite Trigger After Update
SQLite Trigger After Update with history, features, advantages, installation, commands, syntax, datatypes, operators, expressions, databases, table, crud operations, clauses, like, glob, limit, and clause, advance sqlite
SQLite Trigger: AFTER UPDATEIt specifies how to create trigger after update the data. Suppose, we have two tables COMPANY and AUDIT, here we want to keep audit trial for every record being updated in COMPANY table. COMPANY table: CREATE TABLE COMPANY( ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL ); Create a new table named AUDIT where log messages will be inserted whenever there is an updation in COMPANY table. AUDIT table:
CREATE TABLE AUDIT(
EMP_ID INT NOT NULL,
ENTRY_DATE TEXT NOT NULL
);
CREATE trigger after update: Use the following syntax to create a trigger named "after_up" on COMPANY table after update operation.
CREATE TRIGGER after_up AFTER UPDATE
ON COMPANY
BEGIN
INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, datetime('now'));
END;
Now update the old record as following: UPDATE COMPANY SET ADDRESS = 'Noida' WHERE ID = 1; 
See the result: 
See the trigger: SELECT name FROM sqlite_master WHERE type = 'trigger'; 
SQLite Trigger: BEFORE UPDATEIf you want to create the trigger before updating the data:
CREATE TRIGGER befor_up BEFORE UPDATE
ON COMPANY
BEGIN
INSERT INTO AUDIT(EMP_ID, ENTRY_DATE) VALUES (new.ID, datetime('now'));
END;
See the triggers: SELECT name FROM sqlite_master WHERE type = 'trigger'; 
Next TopicSQLite Trigger After Delete
|
Related Links:
- Learn SQLite Tutorial
- SQLite History
- SQLite Interview Questions (2021)
- SQLite Data Types
- SQLite Operators
- SQLite Features
- SQLite Advantages and Disadvantages
- SQLite Installation
- SQLite Commands
- SQLite Syntax
- SQLite Expressions
- SQLite Create Database
- SQLite Attach Database
- SQLite Detach Database
- SQLite Create Table
- SQLite Like Clause
- SQLite Drop Table
- SQLite Insert Query
- SQLite Select Query
- SQLite Joins
- SQLite Update Query
- SQLite Delete Query
- SQLite Where Clause
- SQLite And Clause
- SQLite OR Clause
- SQLite Glob Clause
- SQLite Limit Clause
- SQLite Order by Clause
- SQLite juliandday
- SQLite strftime
- SQLite time
- SQLite Group by Clause
- SQLite Having Clause
- SQLite Distinct Keyword
- SQLite Union
- SQLite Union All
- SQLite Inner Join
- SQLite Outer Join
- SQLite Cross Join
- SQLite Date and Time
- SQLite date
- SQLite datetime
- SQLite now
- SQLite Aggregate Functions
- SQLite MIN Function
- SQLite MAX Function
- SQLite AVG Function
- SQLite COUNT Function
- SQLite SUM Function
- SQLite Triggers
- SQLite Trigger After Insert
- SQLite Trigger After Update
- SQLite Trigger After Delete
- SQLite Drop Trigger
- SQLite Primary Key
- SQLite Foreign Key
- SQLite Import
- SQLite Export