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📜  Python MySQL-游标对象

📅  最后修改于: 2020-11-07 08:49:40             🧑  作者: Mango

mysql-connector-python的MySQLCursor(和类似的库)用于执行与MySQL数据库通信的语句。

使用它的方法，您可以执行SQL语句，从结果集中获取数据，调用过程。

您可以使用Connection对象/类的cursor()方法创建Cursor对象。

例

import mysql.connector

#establishing the connection
conn = mysql.connector.connect(
   user='root', password='password', host='127.0.0.1', database='mydb'
)
#Creating a cursor object using the cursor() method
cursor = conn.cursor()

方法

以下是Cursor类/对象提供的各种方法。

Sr.No Method & Description
1

callproc()

This method is used to call existing procedures MySQL database.
2

close()

This method is used to close the current cursor object.
3

Info()

This method gives information about the last query.
4

executemany()

This method accepts a list series of parameters list. Prepares an MySQL query and executes it with all the parameters.
5

execute()

This method accepts a MySQL query as a parameter and executes the given query.
6

fetchall()

This method retrieves all the rows in the result set of a query and returns them as list of tuples. (If we execute this after retrieving few rows it returns the remaining ones)
7

fetchone()

This method fetches the next row in the result of a query and returns it as a tuple.
8

fetchmany()

This method is similar to the fetchone() but, it retrieves the next set of rows in the result set of a query, instead of a single row.
9

etchwarnings()

This method returns the warnings generated by the last executed query.

物产

以下是Cursor类的属性-

Sr.No Property & Description
1

column_names

This is a read only property which returns the list containing the column names of a result-set.
2

description

This is a read only property which returns the list containing the description of columns in a result-set.
3

lastrowid

This is a read only property, if there are any auto-incremented columns in the table, this returns the value generated for that column in the last INSERT or, UPDATE operation.
4

rowcount

This returns the number of rows returned/updated in case of SELECT and UPDATE operations.
5

statement

This property returns the last executed statement.