【python】資料庫操作
阿新 • • 發佈:2019-02-10
SQLite3 可使用 sqlite3 模組與 Python 進行整合。我們視覺化工具使用SQLLite Expert。
# -*- coding:UTF-8 -*- #參考資料:https://wizardforcel.gitbooks.io/w3school-db/content/sql/110.html #參考資料:http://blog.csdn.net/zmq570235977/article/details/50396313 (SQLLite視覺化工具:SQLiteExpert) import sqlite3 dbName = "test.db" conn = sqlite3.connect(dbName) conn.execute('''CREATE TABLE IF NOT EXISTS COMPANY (ID INT PRIMARY KEY NOT NULL, NAME TEXT NOT NULL, AGE INT NOT NULL, ADDRESS CHAR(50), SALARY REAL)''') print "Table created successfully" conn.close() conn = sqlite3.connect(dbName) print "Opened database successfully"; conn.execute("INSERT OR REPLACE INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) \ VALUES (1, 'Paul', 32, 'California', 20000.00 )"); conn.execute("INSERT OR REPLACE INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) \ VALUES (2, 'Allen', 25, 'Texas', 15000.00 )"); conn.execute("INSERT OR REPLACE INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) \ VALUES (3, 'Teddy', 23, 'Norway', 20000.00 )"); conn.execute("INSERT OR REPLACE INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) \ VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 )"); conn.commit() print "Records created successfully"; conn.close() conn = sqlite3.connect(dbName) print "Opened database successfully"; cursor = conn.execute("SELECT id, name, address, salary from COMPANY") for row in cursor: print "ID = ", row[0] print "NAME = ", row[1] print "ADDRESS = ", row[2] print "SALARY = ", row[3], "\n" print "Operation done successfully"; conn.close()
我們需要特別注意的是當一個表已經存在和一個表中記錄已經存在的時候。我以前是用SQL Server,他是直接可以使用if not exists(select 1 from table_A where ID = 1) insert XXXX
但是SQLLite不行,他用
INSERT OR REPLACE INTO