SQLite in general is a server-less database that you can use within almost all programming languages including Python. Server-less means there is no need to install a separate server to work with SQLite so you can connect directly with the database. SQLite is a lightweight database that can...
你循环读取,也可以使用sqlite3提供的fetchone()和fetchall()方法读取记录: #By Vameiimportsqlite3 conn= sqlite3.connect('test.db') c=conn.cursor()#retrieve one recordc.execute('SELECT name FROM category ORDER BY sort')print(c.fetchone())print(c.fetchone())#retrieve all records as a listc...
# 连接到SQLite数据库文件 conn = sqlite3.connect('your_database.sqlite') # 创建一个游标对象 cursor = conn.cursor() # 执行查询以获取所有表格名称 cursor.execute("SELECT name FROM sqlite_master WHERE type='table';") # 获取查询结果 tables = cursor.fetchall() # 打印表格名称 for table in ta...
conn = sqlite3.connect('example.db') c = conn.cursor() try: # 尝试执行一个SQL语句 c.execute("SELEC * FROM users") # 故意写错的SQL语句 except sqlite3.DatabaseError as e: print(f"数据库错误: {e}") except sqlite3.IntegrityError as e: print(f"完整性错误: {e}") except Exception ...
import sqlite3# 连接到SQLite数据库文件conn = sqlite3.connect('your_database.sqlite')# 创建一个游标对象cursor = conn.cursor()# 执行查询以获取所有表格名称cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")# 获取查询结果tables = cursor.fetchall()# 打印表格名称for table in ta...
import pandas as pd df_data = pd.read_csv(data_file, names=col_list) 显示原始数据,df_data.head() 运行apply函数,并记录该操作耗时: for col in df_data.columns: df_data[col] = df_data.apply(lambda x: apply_md5(x[col]), axis=1) 显示结果数据,df_data.head() 2. Polars测试 Polars...
The sqlite3.Cursor class provides three methods namely fetchall(), fetchmany() and, fetchone() where,The fetchall() 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 ...
import sqlite3 # test.db is a file in the working directory. conn = sqlite3.connect("test.db") c = conn.cursor() # create tables c.execute('''CREATE TABLE category (id int primary key, sort int, name text)''') c.execute('''CREATE TABLE book (id int primary key, sort int, ...
The Python Database API (DB-API) defines the standard interface with which all Python database drivers must comply. These details are documented in PEP 249. All Python database drivers, such as sqlite3 for SQLite, psycopg for PostgreSQL, and MySQL Connector/Python for MySQL, follow these ...
The aim of this tutorial is to extract data from an Excel sheet and load the data into an SQLite database using Python. We will use the sqlite3 standard module, and the pandas and xrld third-party libraries. Since data can be stored in different ways in an Excel sheet, we will address...