python3对数据库的基本操作

其实Python同Java一样，都有对JDBC操作的API。

注意:我的Python版本为3.6.5

Python2.7是应用比较广的，百度博客上很多相关的例子，所以本次不再列出。

只要是用过Java的JDBC，那么对于Python的这个“JDBC”，我相信会更好的理解。

jdbc.py代码如下:

import pymysql
import datetime

host = 'localhost'
username = 'root'
password = '1234'
db_name = 'wordpress'

create_table_sql = """\
CREATE TABLE fuck(
id INT AUTO_INCREMENT PRIMARY KEY,
username VARCHAR(255) UNIQUE ,
nickname VARCHAR(255) NOT NULL ,
birthday DATE
)
"""

insert_table_sql = """\
INSERT INTO fuck(username,nickname,birthday)
 VALUES('{username}','{nickname}','{birthday}')
"""

query_table_sql = """\
SELECT id,username,nickname,birthday
FROM fuck
"""

delete_table_sql = """\
DELETE FROM fuck
"""

drop_table_sql = """\
DROP TABLE fuck
"""

connection = pymysql.connect(host=host,
                             user=username,
                             password=password,
                             charset='utf8mb4',
                             db=db_name)

try:
    with connection.cursor() as cursor:
        print('--------------新建表--------------')
        cursor.execute(create_table_sql)
        connection.commit()

        print('--------------插入数据--------------')
        cursor.execute(
            insert_table_sql.format(username='yitian', nickname='易中天', birthday=datetime.date.today()))
        cursor.execute(
            insert_table_sql.format(username='zhang3', nickname='王立群', birthday=datetime.date.today()))
        cursor.execute(
            insert_table_sql.format(username='li4', nickname='钱文忠', birthday=datetime.date.today()))
        cursor.execute(
            insert_table_sql.format(username='wang5', nickname='郦波', birthday=datetime.date.today()))
        connection.commit()

        print('--------------查询数据--------------')
        cursor.execute(query_table_sql)
        results = cursor.fetchall()
        print(f'id\tname\tnickname\tbirthday')
        for row in results:
            print(row[0], row[1], row[2], row[3], sep='\t')

        print('--------------清除数据--------------')
        cursor.execute(delete_table_sql)
        connection.commit()

#        print('--------------删除表--------------')
#        cursor.execute(drop_table_sql)
#        connection.commit()

finally:
    connection.close()