Sqlite3 Database Python basic operations

1. Database Operation steps

With Sqlite3 you need to import the package sqlite3, the database needs to be connected to the database and then the cursor cursor is created.

When the program finishes running, you need to close the cursor before closing the database.

(1) Query operation

The steps for the query operation are: 1. Querying using SQL statements, 2. Reading query results from Fetchall

selectwhen you execute a statement by using the cursor object, featchall() you can get the result set. The result set is a list, each element is a tuple, corresponding to a row of records.

The sample code is as follows

ImportSqlite3#Importing PackagesConn=sqlite3.connect ('Sample_database')#Connect to the SQLite databaseCursor=conn.cursor ()#Create a cursorCursor.execute ("Select Employee.firstname,employee.lastname from Employee")#using SQL statements to manipulate a database forRowinchCursor.fetchall ():#read operations from Fetchall    Print(Row) cursor.close ()#Close CursorConn.close ()#Close the database

(2) Insert, delete and update operations

The steps are: 1. Querying using SQL statements, 2. Commit operation

ImportSqlite3conn=sqlite3.connect ('Sample_database')#Connect to the SQLite databaseCursor=conn.cursor ()#Create a cursorCursor.execute ('CREATE TABLE User (ID varchar () primary key, name varchar )')#Create a table with SQL statementsCursor.execute ('INSERT into user (ID, name) VALUES (\ ' 1\ ', \ ' michael\ ')')#inserting data into a table with an SQL statementPrint(Cursor.rowcount)#display the inserted functionCursor.close ()#Close CursorConn.commit ()#Commit ActionConn.close ()#Close the database

When executed with a cursor object, the execution result is obtained by the number of rows that are insert update delete affected by the rowcount return of the statement.

Resources

Using sqlite-Liaoche: https://www.liaoxuefeng.com/wiki/001374738125095c955c1e6d8bb493182103fac9270762a000/ 001388320596292f925f46d56ef4c80a1c9d8e47e2d5711000

Sqlite3 Database Python basic operations