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Python sqlite3数据库是一款非常小巧的内置模块，它使用一个文件存储整个数据库，操作十分方便，相比其他大型数据库来说，确实有些差距。但是在性能表现上并不逊色，麻雀虽小，五脏俱全，sqlite3实现了多少sql-92标准，比如说transaction、trigger和复杂的查询等。
描述
Python的数据库模块有统一的接口标准，所以数据库操作都有统一的模式（假设数据库模块名为db）：
1. 用db.connect创建数据库连接，假设连接对象为conn
2. 如果该数据库操作不需要返回结果，就直接使用conn.execute查询，根据数据库事物隔离级别的不同，可能修改数据库需要conn.commit
3. 如果需要返回查询结果则用conn.cursor创建游标对象cur,通过cur.execute查询数据库，cursor方法有fetchall、fetchone、fetchmany返回查询结果，根据数据库事物隔离级别不同，可能修改数据库需要coon.commit
4. 关闭cur.close
sqlite3基本操作用例
#coding=utf-8 import sqlite3 conn = sqlite3.connect("sqlite.db") #创建sqlite.db数据库 print ("open database success") conn.execute("drop table IF EXISTS student") query = """create table IF NOT EXISTS student( customer VARCHAR(20), produce VARCHAR(40), amount FLOAT, date DATE );""" conn.execute(query) print ("Table created successfully") #在表中插入数据 ''' 方法1 ''' #data = '''INSERT INTO student(customer,produce,amount,date)\ # VALUES("zhangsan","notepad",999,"2017-01-02")''' #conn.execute(data) #data = '''INSERT INTO student(customer,produce,amount,date)\ # VALUES("lishi","binder",3.45,"2017-04-05")''' #conn.execute(data) #conn.commit() ''' 方法2 ''' statement = "INSERT INTO student VALUES(?,?,?,?)" data = [("zhangsan","notepad",999,"2017-01-02"),("lishi","binder",3.45,"2017-04-05")] conn.executemany(statement, data) conn.commit() curson = conn.execute("select * from student") conn.commit() print (curson) rows = curson.fetchall() print (rows) conn.close()
sqlite3 csv->db->csv
'''将csv数据导入数据库''' import sys import csv import sqlite3 #解析csv文件 def parsecsvFile(filepath): header = None data = [] with open(filepath, 'r') as csvfile: filereader = csv.reader(csvfile) header = next(filereader) #print (header) for row in filereader: data.append(row) #print (data) return header,data #使用sqlite3写数据库 def initdb(header, data): conn = sqlite3.connect("sqlite.db") print ("connect database success") conn.execute("drop table IF EXISTS student") conn.commit() query = '''create table IF NOT EXISTS student(\ Supplier Name VARCHAR(32), Invoice Number VARCHAR(16), Part Number VARCHAR(16), Cost VARCHAR(16), Purchase Date DATE);''' conn.execute(query) conn.commit() statement = "INSERT INTO student VALUES(?,?,?,?,?)" conn.executemany(statement, data) conn.commit() curson = conn.execute("select * from student") conn.commit() print (curson) rows = curson.fetchall() print (rows) conn.close() return rows #根据数据库内容写csv文件 def wirtecsvfile(writefilepath, header, data): with open(writefilepath, 'a+') as writefile: writer = csv.writer(writefile, delimiter=",") writer.writerow(header) for row in data: writer.writerow(row) if __name__ == "__main__": readfilepath = sys.argv[1] writefilepath = sys.argv[2] header,data = parsecsvFile(readfilepath) rows = initdb(header, data) wirtecsvfile(writefilepath, header, rows)
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