1. 程式人生 > >【python】資料庫操作

【python】資料庫操作

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