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"cells": [
{
"cell_type": "markdown",
"id": "84513081",
"metadata": {},
"source": [
"## 查看数据"
]
},
{
"cell_type": "code",
"execution_count": 1,
"id": "23241985",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:10:53.493078Z",
"start_time": "2023-10-10T12:10:53.417598Z"
},
"scrolled": true
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"<pymysql.connections.Connection object at 0x106d22760>\n",
"(5, '孙铭阳', '男', 20, '广东', '23446523', '23446523@qq.com', 'zhangsan', '123')\n",
"(17, '李四', '女', 26, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(21, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(22, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(25, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(27, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(28, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(29, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(30, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(31, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(32, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(33, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(34, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(35, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(36, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(37, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(38, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(39, '李永波', '女', 43, '广东', '236543', '236543@qq.com', None, None)\n",
"(40, '00', '男', 78, '广东', '99', '123', None, None)\n"
]
}
],
"source": [
"import pymysql\n",
"\n",
"## 连接数据库\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset='utf8') # 编码 UTF-8\n",
"\n",
"print(connection)\n",
"\n",
"# 创建 cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写 sql\n",
"sql = \"select * from user\"\n",
"\n",
"# 执行 SQL\n",
"cursor.execute(sql)\n",
"\n",
"# 获取结果集\n",
"users = cursor.fetchall()\n",
"\n",
"# 查看结果\n",
"for u in users:\n",
" print(u)"
]
},
{
"cell_type": "markdown",
"id": "ebb6eacc",
"metadata": {},
"source": [
"## 插入数据"
]
},
{
"cell_type": "code",
"execution_count": 2,
"id": "eb638782",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:15:52.983647Z",
"start_time": "2023-10-10T12:15:52.960757Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 1\n"
]
}
],
"source": [
"import pymysql\n",
"\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\",\n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
"\n",
"# 获取cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写sql\n",
"sql = \"insert into user(id, name) values(41, 'Tom')\"\n",
"\n",
"# 执行sql，返回 影响的行数\n",
"count = cursor.execute(sql)\n",
"\n",
"print(\"count: \", count)\n",
"\n",
"# 执行DML时候，会开启一个事务，需要我们主动提交 -- 防止对数据进行误操作\n",
"connection.commit()"
]
},
{
"cell_type": "markdown",
"id": "4e53b475",
"metadata": {},
"source": [
"## 修改数据"
]
},
{
"cell_type": "code",
"execution_count": 4,
"id": "af994da0",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:18:28.072611Z",
"start_time": "2023-10-10T12:18:28.062564Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 1\n"
]
}
],
"source": [
"import pymysql\n",
"\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
"\n",
"# 获取cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写sql\n",
"sql = \"update user set gender='男' where id=41\"\n",
"\n",
"# 执行sql，返回受影响的行数\n",
"count = cursor.execute(sql)\n",
"print(\"count:\", count)\n",
"\n",
"# 执行DML时候，会开启一个事务，需要我们主动提交 -- 防止对数据进行误操作\n",
"connection.commit()"
]
},
{
"cell_type": "markdown",
"id": "7155a879",
"metadata": {},
"source": [
"## 删除数据"
]
},
{
"cell_type": "code",
"execution_count": 5,
"id": "985d4f0b",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:20:45.873650Z",
"start_time": "2023-10-10T12:20:45.864234Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 1\n"
]
}
],
"source": [
"import pymysql\n",
"\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
"\n",
"# 获取cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写sql\n",
"sql = \"delete from user where id=41\"\n",
"\n",
"# 执行sql，返回受影响的行数\n",
"count = cursor.execute(sql)\n",
"print(\"count:\", count)\n",
"\n",
"# 执行DML时候，会开启一个事务，需要我们主动提交 -- 防止对数据进行误操作\n",
"connection.commit()"
]
},
{
"cell_type": "markdown",
"id": "56bce4d3",
"metadata": {},
"source": [
"## 查询漏洞"
]
},
{
"cell_type": "code",
"execution_count": 7,
"id": "29422cfe",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:24:40.726658Z",
"start_time": "2023-10-10T12:24:40.717935Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 19\n"
]
}
],
"source": [
"import pymysql\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
"\n",
"# 获取cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写sql\n",
"sql = \"select * from user where name=%s\" % (\"'scott' or 1=1\")\n",
"\n",
"# 执行sql\n",
"count = cursor.execute(sql)\n",
"print(\"count:\", count)\n",
"\n",
"# 执行DML时候，会开启一个事务，需要我们主动提交 -- 防止对数据进行误操作\n",
"connection.commit()"
]
},
{
"cell_type": "markdown",
"id": "706a683b",
"metadata": {},
"source": [
"## 传递参数"
]
},
{
"cell_type": "code",
"execution_count": 8,
"id": "a468b121",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:26:10.322260Z",
"start_time": "2023-10-10T12:26:10.310338Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 1\n"
]
}
],
"source": [
"import pymysql\n",
"# 获取连接\n",
"connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
"\n",
"# 获取cursor对象\n",
"cursor = connection.cursor()\n",
"\n",
"# 编写sql\n",
"sql = \"insert into user(id, name) values(%s, %s)\"\n",
"\n",
"# 执行sql\n",
"args = (41, 'marry')\n",
"count = cursor.execute(sql, args)\n",
"print(\"count:\", count)\n",
"\n",
"# 执行DML时候，会开启一个事务，需要我们主动提交 -- 防止对数据进行误操作\n",
"connection.commit()"
]
},
{
"cell_type": "markdown",
"id": "84a00649",
"metadata": {},
"source": [
"## 添加异常处理"
]
},
{
"cell_type": "code",
"execution_count": 9,
"id": "d24cf6a9",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:32:36.642368Z",
"start_time": "2023-10-10T12:32:36.630347Z"
},
"scrolled": true
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"count: 1\n"
]
}
],
"source": [
"import pymysql\n",
"connection = None\n",
"cursor = None\n",
"\n",
"try:\n",
" # 获取连接\n",
" connection = pymysql.connect(\n",
" host=\"localhost\", user=\"root\", password=\"zxydsg123\", \n",
" db=\"User_information_case\", # 数据库名称\n",
" charset=\"utf8\") # 编码 UTF-8\n",
" \n",
" # 获取 cursor对象\n",
" cursor = connection.cursor()\n",
" \n",
" # 编写sql\n",
" sql = \"insert into user(id, name) values(%s, %s)\"\n",
" \n",
" # 执行sql\n",
" args = (1234, 'Tom')\n",
" count = cursor.execute(sql, args)\n",
" print(\"count:\", count)\n",
" \n",
" # 执行DML时候，会开启一个事务，需要我们主动提交\n",
" connection.commit()\n",
" \n",
"except Exception as e:\n",
" # 如果捕获到异常\n",
" print(e)\n",
" \n",
" if connection:\n",
" # 回滚事务\n",
" connection.rollback()\n",
" \n",
"finally:\n",
" # 无论是否捕获到异常，我们都要关闭cursor，释放资源\n",
" if cursor:\n",
" cursor.close()\n",
" \n",
" if connection:\n",
" cursor.close()"
]
},
{
"cell_type": "markdown",
"id": "874055be",
"metadata": {},
"source": [
"## DBUtil功能封装"
]
},
{
"cell_type": "code",
"execution_count": 11,
"id": "8873d37e",
"metadata": {
"ExecuteTime": {
"end_time": "2023-10-10T12:44:33.199935Z",
"start_time": "2023-10-10T12:44:33.175199Z"
}
},
"outputs": [
{
"name": "stdout",
"output_type": "stream",
"text": [
"(1062, \"Duplicate entry '9999' for key 'user.PRIMARY'\")\n",
"(9999, 'lili', '女', None, None, None, None, None, None)\n",
"(5, '孙铭阳', '男', 20, '广东', '23446523', '23446523@qq.com', 'zhangsan', '123')\n",
"(17, '李四', '女', 26, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(21, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(22, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(25, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(27, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(28, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(29, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(30, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(31, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(32, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(33, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(34, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(35, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(36, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(37, '李四', '男', 24, '广东', '12345123', 'lisi@qq.com', None, None)\n",
"(38, '王五', '男', 25, '湖南', '12345123', 'lisi@qq.com', None, None)\n",
"(39, '李永波', '女', 43, '广东', '236543', '236543@qq.com', None, None)\n",
"(40, '00', '男', 78, '广东', '99', '123', None, None)\n",
"(41, 'marry', None, None, None, None, None, None, None)\n",
"(1234, 'Tom', None, None, None, None, None, None, None)\n",
"(9999, 'lili', '女', None, None, None, None, None, None)\n"
]
}
],
"source": [
"import pymysql\n",
"\n",
"\n",
"class DBUtil:\n",
" \"\"\"数据库工具类\"\"\"\n",
"\n",
" config = {\n",
" \"host\": \"localhost\",\n",
" \"user\": \"root\",\n",
" \"password\": \"zxydsg123\",\n",
" \"db\": \"User_information_case\", # 数据库名称\n",
" \"charset\": \"utf8\" # 编码 UTF-8\n",
" }\n",
"\n",
" def __init__(self):\n",
"\n",
" # 建立连接，传入参数\n",
" self.connection = pymysql.connect(**DBUtil.config)\n",
"\n",
" # 创建 cursor对象\n",
" self.cursor = self.connection.cursor()\n",
"\n",
" def close(self):\n",
" \"\"\"释放资源\"\"\"\n",
" if self.cursor:\n",
" self.cursor.close()\n",
" if self.connection:\n",
" self.connection.close()\n",
"\n",
" def exeDML(self, sql, *args):\n",
" \"\"\"DML（Data Manipulation Language）语句: 数据操纵语言 -- 插入 修改 删除调用\"\"\"\n",
" try:\n",
" # 执行sql，返回影响到的行数\n",
" count = self.cursor.execute(sql, args)\n",
" \n",
" # 提交事务\n",
" self.connection.commit()\n",
" \n",
" return count\n",
" \n",
" # 如果捕获到异常\n",
" except Exception as e:\n",
" print(e)\n",
" \n",
" # 回滚食物\n",
" if self.connection:\n",
" self.connection.rollback()\n",
"\n",
" def query_one(self, sql, *args):\n",
" \"\"\"查询单行数据\"\"\"\n",
" try:\n",
" # 执行sql\n",
" self.cursor.execute(sql, args)\n",
" \n",
" # 获取结果集\n",
" return self.cursor.fetchone()\n",
" \n",
" except Exception as e:\n",
" print(e)\n",
" \n",
" def query_all(self, sql, *args):\n",
" \"\"\"查询所有数据\"\"\"\n",
" try:\n",
" # 执行sql\n",
" self.cursor.execute(sql, args)\n",
" # 获取结果集\n",
" return self.cursor.fetchall()\n",
" \n",
" except Exception as e:\n",
" print(e)\n",
"\n",
"\n",
"if __name__ == \"__main__\":\n",
" \n",
" # 创建 DBUtil\n",
" dbutil = DBUtil()\n",
" \n",
" # 插入数据\n",
" sql = \"insert into user(id, name, gender) values(%s, %s, %s)\"\n",
" \n",
" count = dbutil.exeDML(sql, 9999,'lili', '女')\n",
"\n",
" \n",
" # 查询单行数据\n",
" sql = \"select * from user where id=%s\"\n",
"\n",
" # 打印查询结果\n",
" emp = dbutil.query_one(sql, 9999)\n",
" print(emp)\n",
"\n",
" \n",
" # 查询所有数据\n",
" sql = \"select * from user\"\n",
" users = dbutil.query_all(sql)\n",
" for u in users:\n",
" print(u)\n",
" \n",
" # 记得释放资源\n",
" dbutil.close()"
]
}
],
"metadata": {
"kernelspec": {
"display_name": "Python 3 (ipykernel)",
"language": "python",
"name": "python3"
},
"language_info": {
"codemirror_mode": {
"name": "ipython",
"version": 3
},
"file_extension": ".py",
"mimetype": "text/x-python",
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.9.12"
},
"toc": {
"base_numbering": 1,
"nav_menu": {},
"number_sections": true,
"sideBar": true,
"skip_h1_title": false,
"title_cell": "Table of Contents",
"title_sidebar": "Contents",
"toc_cell": false,
"toc_position": {
"height": "calc(100% - 180px)",
"left": "10px",
"top": "150px",
"width": "288px"
},
"toc_section_display": true,
"toc_window_display": true
}
},
"nbformat": 4,
"nbformat_minor": 5
}
|