Benjamin

静以修身,俭以养德,非澹薄无以明志,非宁静无以致远。
随笔 - 276, 文章 - 0, 评论 - 196, 引用 - 0
数据加载中……

python的pymysql游标的使用

Method MySQLCursor.executemany(operation, seq_params)
数据库操作operation会执行多次,直至seq_params中所有参数执行完毕。
data = [
('Jane', date(2005, 2, 12)),
('Joe', date(2006, 5, 23)),
('John', date(2010, 10, 3)),
]
stmt = "INSERT INTO employees (first_name, hire_date) VALUES (%s, %s)"
cursor.executemany(stmt, data)
Method MySQLCursor.fetchall()
返回查询的结果集合。
>>> cursor.execute("SELECT * FROM employees ORDER BY emp_no")
>>> head_rows = cursor.fetchmany(size=2)
>>> remaining_rows = cursor.fetchall()
Method MySQLCursor.fetchmany(size=1)
返回接下来的size个查询结果,如果没有足够的结果,则返回空的list。
Method MySQLCursor.fetchone()
返回接下来的一个查询结果,该函数在fetchamany()和fetchalll()中调用。
Property MySQLCursor.column_names
只读属性。返回一个Unicode编码的string,为结果集合的列名称。
cursor.execute("SELECT last_name, first_name, hire_date "
"FROM employees WHERE emp_no = %s", (123,))
row = dict(zip(cursor.column_names, cursor.fetchone())
print("{last_name}, {first_name}: {hire_date}".format(row))
cursor.MySQLCursorDict Class用法(继承自MySQLCursor,返回每行的字典)
cnx = mysql.connector.connect(database='world')
cursor = cnx.cursor(dictionary=True)
cursor.execute("SELECT * FROM country WHERE Continent = 'Europe'")
print("Countries in Europe:")
for row in cursor:
    print("* {Name}".format(Name=row['Name']
也可以通过format来访问    
cursor.execute("SELECT Name, Population FROM country WHERE Continent = 'Europe'")
print("Countries in Europe with population:")
for row in cursor:
    print("* {Name}: {Population}".format(**row))
    
    
    
 cursor.MySQLCursorRaw Class(行号游标)
 import mysql.connector
cnx = mysql.connector.connect()
# Only this particular cursor will be raw
cursor = cnx.cursor(raw=True)
# All cursors created from cnx2 will be raw by default
cnx2 = mysql.connector.connect(raw=True)
cursor.MySQLCursorNamedTuple(行元组)
cnx = mysql.connector.connect(database='world')
cursor = cnx.cursor(named_tuple=True)
cursor.execute("SELECT * FROM country WHERE Continent = 'Europe'")
print("Countries in Europe with population:")
for row in cursor:
    print("* {Name}: {Population}".format(
        Name=row.Name,
        Population=row.Population
    ))

posted on 2020-05-09 16:01 Benjamin 阅读(41) 评论(0)  编辑 收藏 引用 所属分类: python


只有注册用户登录后才能发表评论。
【推荐】超50万行VC++源码: 大型组态工控、电力仿真CAD与GIS源码库
网站导航: 博客园   IT新闻   BlogJava   知识库   博问   管理