python操作mysql数据库的相关操作实例# -*- coding: utf-8 -*-#python operate mysql databaseimport MySQLdb #数据库名称DATABAS...
python操作mysql数据库的相关操作实例
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# -*- 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() |