📌  相关文章
📜  Python SQLite-游标对象

📅  最后修改于: 2020-11-06 05:59:22             🧑  作者: Mango

sqlite3.Cursor类是一个实例，您可以使用该实例调用执行SQLite语句的方法，并从查询的结果集中获取数据。您可以使用Connection对象/类的cursor()方法创建Cursor对象。

例

import sqlite3
#Connecting to sqlite
conn = sqlite3.connect('example.db')

#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。

Method Description
execute()

This routine executes an SQL statement. The SQL statement may be parameterized (i.e., placeholders instead of SQL literals). The psycopg2 module supports placeholder using %s sign

For example:cursor.execute(“insert into people values (%s, %s)”, (who, age))
executemany()

This routine executes an SQL command against all parameter sequences or mappings found in the sequence sql.
fetchone()

This method fetches the next row of a query result set, returning a single sequence, or None when no more data is available.
fetchmany()

This routine fetches the next set of rows of a query result, returning a list. An empty list is returned when no more rows are available. The method tries to fetch as many rows as indicated by the size parameter.
fetchall()

This routine fetches all (remaining) rows of a query result, returning a list. An empty list is returned when no rows are available.

物产

以下是Cursor类的属性-

Method Description
arraySize

This is a read/write property you can set the number of rows returned by the fetchmany() method.
description

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

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

This read-only attribute provides the SQLite database Connection used by the Cursor object.