python操作mysql数据库

python操作mysql数据库的相关操作实例

# -*- coding: utf-8 -*-
#python operate mysql database
import MySQLdb
 
#数据库名称
DATABASE_NAME = \'\'
#host = \'localhost\' or \'172.0.0.1\'
HOST = \'\'
#端口号
PORT = \'\'
#用户名称
USER_NAME = \'\'
#数据库密码
PASSWORD = \'\'
#数据库编码
CHAR_SET = \'\'
 
#初始化参数
def init():
    global DATABASE_NAME
    DATABASE_NAME = \'test\'
    global HOST
    HOST = \'localhost\'
    global PORT
    PORT = \'3306\'
    global USER_NAME
    USER_NAME = \'root\'
    global PASSWORD
    PASSWORD = \'root\'
    global CHAR_SET
    CHAR_SET = \'utf8\'
     
#获取数据库连接
def get_conn():
    init()
    return MySQLdb.connect(host = HOST, user = USER_NAME, passwd = PASSWORD, db = DATABASE_NAME, charset = CHAR_SET)
 
#获取cursor
def get_cursor(conn):
    return conn.cursor()
 
#关闭连接
def conn_close(conn):
    if conn != None:
        conn.close()
 
#关闭cursor
def cursor_close(cursor):
    if cursor != None:
        cursor.close()
 
#关闭所有
def close(cursor, conn):
    cursor_close(cursor)
    conn_close(conn)
 
#创建表
def create_table():
    sql = \'\'\'
    CREATE TABLE `student` (
    `id` int(11) NOT NULL,
    `name` varchar(20) NOT NULL,
    `age` int(11) DEFAULT NULL,
    PRIMARY KEY (`id`),
    UNIQUE KEY `name` (`name`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8
    \'\'\'
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    conn.commit()
    close(cursor, conn)
    return result
 
#查询表信息
def query_table(table_name):
    if table_name != \'\':
        sql = \'select * from \' + table_name
        conn = get_conn()
        cursor = get_cursor(conn)
        result = cursor.execute(sql)
        for row in cursor.fetchall():
            print(row)
            #for r in row:      #循环每一条数据
                #print(r)
        close(cursor, conn)
    else:
        print(\'table name is empty!\')
 
#插入数据
def insert_table():
    sql = \'insert into student(id, name, age) values(%s, %s, %s)\'
    params = (\'1\', \'Hongten_a\', \'21\')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
 
#更新数据
def update_table():
    sql = \'update student set name = %s where id = 1\'
    params = (\'HONGTEN\')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
 
#删除数据
def delete_data():
    sql = \'delete from student where id = %s\'
    params = (\'1\')
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql, params)
    conn.commit()
    close(cursor, conn)
    return result
 
#数据库连接信息   
def print_info():
    print(\'数据库连接信息:\' + DATABASE_NAME + HOST + PORT + USER_NAME + PASSWORD + CHAR_SET)
 
#打印出数据库中表情况
def show_databases():
    sql = \'show databases\'
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    for row in cursor.fetchall():
        print(row)
         
#数据库中表情况
def show_tables():
    sql = \'show tables\'
    conn = get_conn()
    cursor = get_cursor(conn)
    result = cursor.execute(sql)
    for row in cursor.fetchall():
        print(row)
 
    
def main():
    show_tables()
    #创建表
    result = create_table()
    print(result)
    #查询表
    query_table(\'student\')
    #插入数据
    print(insert_table())
    print(\'插入数据后....\')
    query_table(\'student\')
    #更新数据
    print(update_table())
    print(\'更新数据后....\')
    query_table(\'student\')
    #删除数据
    delete_data()
    print(\'删除数据后....\')
    query_table(\'student\')
    print_info()
    #数据库中表情况
    show_tables()
     
 
if __name__ == \'__main__\':
    main()