在Python3中使用mysql數據庫須要安裝pymysql庫python
pip install pymysql
import pymysql
db = pymysql.connect(host="數據庫地址", user="用戶名", password="密碼", port="端口", database="數據庫名", charset='utf8')
cursor = db.cursor()
# 若是數據表已經存在使用execute()方法刪除表。 cursor.execute("DROP TABLE IF EXISTS EMPLOYEE") # 建立數據表SQL語句 sql = """CREATE TABLE EMPLOYEE ( FIRST_NAME CHAR(20) NOT NULL, LAST_NAME CHAR(20), AGE INT, SEX CHAR(1), INCOME FLOAT )""" cursor.execute(sql)
# SQL 查詢語句 sql = "SELECT * FROM EMPLOYEE WHERE INCOME > {}".format(1000) try: # 執行SQL語句 cursor.execute(sql) # 獲取全部記錄列表 results = cursor.fetchall() for row in results: fname = row[0] lname = row[1] age = row[2] sex = row[3] income = row[4] # 打印結果 print("fname={},lname={},age={},sex={},income={}".format(fname, lname, age, sex, income)) except: print("Error: unable to fecth data")
# SQL 插入語句 sql = """INSERT INTO EMPLOYEE(FIRST_NAME, LAST_NAME, AGE, SEX, INCOME) VALUES ('Mac', 'Mohan', 20, 'M', 2000)""" try: cursor.execute(sql) # 提交到數據庫執行 db.commit() except: # 發生錯誤時回滾 db.rollback()
# SQL 更新語句 sql = "UPDATE EMPLOYEE SET AGE = AGE + 1 WHERE SEX = '{}'".format('M') try: cursor.execute(sql) # 提交到數據庫執行 db.commit() except: # 發生錯誤時回滾 db.rollback()
# SQL 刪除語句 sql = "DELETE FROM EMPLOYEE WHERE AGE > {}".format(20) try: cursor.execute(sql) # 提交到數據庫執行 db.commit() except: # 發生錯誤時回滾 db.rollback()
cursor.close() db.close()