lab1
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Assignments/Assignment1/source/.$ER图.drawio.bkp
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Assignments/Assignment1/source/.$ER图.drawio.bkp
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Assignments/Assignment1/source/.$语义网络1.drawio.bkp
Normal file
44
Assignments/Assignment1/source/.$语义网络1.drawio.bkp
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418
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418
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202
Assignments/Assignment1/source/ER图.drawio
Normal file
202
Assignments/Assignment1/source/ER图.drawio
Normal file
@ -0,0 +1,202 @@
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|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-28" value="乘客" style="rounded=1;whiteSpace=wrap;html=1;fontSize=12;glass=0;strokeWidth=1;shadow=0;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="360" y="680" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-30" value="姓名" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="360" y="560" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-31" value="<u>身份证号</u>" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="200" y="680" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-40" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-32" target="3iPYnmSqufLgARxov59r-39">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-41" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=0;exitDx=0;exitDy=0;entryX=0.5;entryY=1;entryDx=0;entryDy=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-32" target="3iPYnmSqufLgARxov59r-38">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-83" value="N" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;endArrow=block;endFill=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-32" target="WIyWlLk6GJQsqaUBKTNV-12">
|
||||
<mxGeometry y="10" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
</mxGeometry>
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-32" value="乘坐" style="rhombus;whiteSpace=wrap;html=1;shadow=0;fontFamily=Helvetica;fontSize=12;align=center;strokeWidth=1;spacing=6;spacingTop=-4;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="660" width="120" height="80" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-38" value="车票" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="560" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-39" value="车次号" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="800" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-42" value="手机号" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="360" y="800" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-50" value="<u>车次号</u>" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1000" y="560" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-56" value="座位编号" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="840" y="480" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-60" value="<u>车票ID</u>" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1000" y="240" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-64" value="始发站" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1160" y="300" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-65" value="到达站" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1160" y="360" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-66" value="价格" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1160" y="420" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-70" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=0;exitDx=0;exitDy=0;entryX=0.5;entryY=1;entryDx=0;entryDy=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-73" target="3iPYnmSqufLgARxov59r-74">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-72" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-73" target="3iPYnmSqufLgARxov59r-76">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-78" style="rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0;exitY=0;exitDx=0;exitDy=0;entryX=1;entryY=1;entryDx=0;entryDy=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-73" target="3iPYnmSqufLgARxov59r-77">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-80" value="M" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;endArrow=block;endFill=0;" edge="1" parent="WIyWlLk6GJQsqaUBKTNV-1" source="3iPYnmSqufLgARxov59r-73" target="gZ4-rkGjbmfCSzAvaelg-20">
|
||||
<mxGeometry y="10" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
</mxGeometry>
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-73" value="购票" style="rhombus;whiteSpace=wrap;html=1;shadow=0;fontFamily=Helvetica;fontSize=12;align=center;strokeWidth=1;spacing=6;spacingTop=-4;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="340" width="120" height="80" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-74" value="时间" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="240" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-76" value="<u>交易单号</u>" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="480" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-77" value="支付" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="550" y="280" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-85" value="省名" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="880" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-87" value="<u>车站名</u>" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="520" y="980" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-88" value="城市名" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="680" y="1080" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="3iPYnmSqufLgARxov59r-97" value="到站时间" style="ellipse;whiteSpace=wrap;html=1;" vertex="1" parent="WIyWlLk6GJQsqaUBKTNV-1">
|
||||
<mxGeometry x="1160" y="980" width="120" height="40" as="geometry" />
|
||||
</mxCell>
|
||||
</root>
|
||||
</mxGraphModel>
|
||||
</diagram>
|
||||
</mxfile>
|
||||
4
Assignments/Assignment1/source/ER图.drawio.svg
Normal file
4
Assignments/Assignment1/source/ER图.drawio.svg
Normal file
File diff suppressed because one or more lines are too long
|
After Width: | Height: | Size: 222 KiB |
393
Assignments/Assignment1/source/作业1_21281280_柯劲帆.md
Normal file
393
Assignments/Assignment1/source/作业1_21281280_柯劲帆.md
Normal file
@ -0,0 +1,393 @@
|
||||
<h1><center>课程作业</center></h1>
|
||||
|
||||
<div style="text-align: center;">
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">课程名称</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">数据库系统原理</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">作业次数</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">作业#1</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">学号</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">21281280</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">姓名</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">柯劲帆</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">班级</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">物联网2101班</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">指导老师</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">郝爽</span></div>
|
||||
<div><span style="display: inline-block; width: 65px; text-align: center;">修改日期</span><span style="display: inline-block; width: 25px;">:</span><span style="display: inline-block; width: 210px; font-weight: bold; text-align: left;">2024年3月13日</span></div>
|
||||
</div>
|
||||
|
||||
|
||||
|
||||
|
||||
---
|
||||
|
||||
## 1. 题目1
|
||||
|
||||
> **语义网络是用于描述概念间关系的一种工具，请准确掌握如下两组基本概念，并用VISIO画出能准确表达这些概念之间关系的语义网络。**
|
||||
> 1. **数据、数据库、数据模型、数据库管理系统、软件、模型、数据库系统**
|
||||
> 2. **实体、实体集、属性、实体标识符、实体型、域、联系**
|
||||
|
||||
**第一组概念：**
|
||||
|
||||
1. **数据（Data）**：信息的最基本单元，可以是数字、文字或者任何其他形式的记录。
|
||||
2. **数据库（Database）**：系统地组织、存储和管理数据的集合，以便可以高效地访问和更新。
|
||||
3. **数据模型（Data Model）**：描述数据、数据关系、数据语义和数据约束的抽象模型，用于设计数据库的结构。
|
||||
4. **数据库管理系统（Database Management System, DBMS）**：软件系统，用于创建、维护和操作数据库，提供数据的存储、查询和更新功能。
|
||||
5. **软件（Software）**：计算机程序和相关的文档和数据的集合。
|
||||
6. **模型（Model）**：现实世界事物的抽象和表示，可以是数据模型、数学模型等。
|
||||
7. **数据库系统（Database System）**：包括数据库、数据库管理系统（DBMS）、应用程序和数据库管理员的总称，整体用于数据的管理和访问。
|
||||
|
||||
**关系描述**：
|
||||
|
||||
- 数据模型用于设计数据库，因此数据模型和数据库之间存在设计关系。
|
||||
- 数据库被数据库管理系统管理，表明数据库和DBMS之间有管理关系。
|
||||
- 数据库管理系统是一种软件，因此DBMS是软件的一个子类。
|
||||
- 数据库系统是一个更广泛的概念，包括数据库、DBMS、应用程序等，显示它们之间的包含关系。
|
||||
- 模型是一个广泛的概念，数据模型是模型的一种，特指用于数据库设计的模型。
|
||||
|
||||
<img src="语义网络1.drawio.svg" alt="语义网络1" style="zoom: 50%;" />
|
||||
|
||||
**第二组概念：**
|
||||
|
||||
1. **实体（Entity）**：现实世界中可以独立存在并可以区分的事物。
|
||||
2. **实体集（Entity Set）**：具有相同属性的实体的集合。
|
||||
3. **属性（Attribute）**：实体所具有的特征，如姓名、地址等。
|
||||
4. **实体标识符（Entity Identifier）**：唯一标识实体集中每个实体的属性或属性组合。
|
||||
5. **实体型（Entity Type）**：描述实体集的结构，即实体具有哪些属性。
|
||||
6. **域（Domain）**：属性可以取值的集合。
|
||||
7. **联系（Relationship）**：实体之间的关系，可以是一对一、一对多或多对多等。
|
||||
|
||||
**关系描述**：
|
||||
|
||||
- 实体集由相同类型的实体构成，因此实体和实体集之间存在归属关系。
|
||||
- 实体具有属性，表示实体和属性之间有拥有关系。
|
||||
- 实体标识符是特定于实体集的，用于唯一标识其中的实体，显示实体标识符和实体集之间的关联关系。
|
||||
- 实体型定义了实体集的结构，即包含哪些属性，因此实体型和实体集之间有定义关系。
|
||||
- 域是属性可能取值的范围，因此属性和域之间存在限制关系。
|
||||
- 联系描述了实体之间的关系，因此实体间存在联系关系，这可以通过实体型来描述。
|
||||
|
||||
<img src="./语义网络2.drawio.svg" alt="语义网络2" style="zoom: 50%;" />
|
||||
|
||||
|
||||
|
||||
## 2. 题目2
|
||||
|
||||
> **请从如下现实业务背景中任选一个，用VISIO画出ER图表达的简化的概念模型（10个实体集以内，不必穷尽）。**
|
||||
>
|
||||
> - **12306网站余票查询业务模型**
|
||||
> - **航空公司航班查询业务模型**
|
||||
> - **支付宝或微信支付业务模型**
|
||||
> - **银行账户与转账业务模型**
|
||||
> - **微信朋友圈业务模型**
|
||||
> - **微信用户及聊天群聊天业务模型**
|
||||
> - **短视频平台业务模型**
|
||||
> - **知乎等论坛业务模型**
|
||||
> - **互联网点餐业务模型**
|
||||
> - **快餐店点餐业务模型（门店或网络点餐）**
|
||||
>
|
||||
> **注：因本学期所有的实验以及课程设计均围绕上述业务背景之一开展，建议尽早选定一个业务模型，尽早理解与分析业务，圈定你将实现的系统的功能范围（不建议范围过大）。**
|
||||
|
||||
<img src="ER图.drawio.svg" alt="ER图" style="zoom:67%;" />
|
||||
|
||||
## 3. 题目3
|
||||
|
||||
> **关系模型设计时经常会涉及完整性约束，数据模型中的完整性约束来源于业务背景中完整性约束要求。请观察并分析第2题中你选定的业务场景，举出至少3个以上的完整性约束例子。**
|
||||
|
||||
1. **实体完整性约束**：确保每个表的主键是唯一的，不允许有重复值，也不允许有空值。
|
||||
- 例如，在乘客表中，身份证号可以作为主键，因为每个乘客的身份证号是唯一的。
|
||||
- 列车表中，列车号可以作为主键，因为每个列车号是唯一标识一列列车的。
|
||||
2. **参照完整性约束**：确保表之间的外键关系有效，即外键字段的值必须在关联表的主键字段中存在或者是空值。
|
||||
- 在列车车票表中，列车号需要与列车表中的列车号相对应，这保证了列车车票的列车号在列车表中有一个有效的引用。
|
||||
- 同样，列车车票表中的车站名需要与车站表中的车站名相对应，确保了车站名的有效性。
|
||||
3. **域完整性约束**：指定属性值的类型、格式、范围或其他属性，确保数据符合特定条件。
|
||||
- 例如，手机号在乘客表中应该遵循特定的格式，并且只能包含数字。
|
||||
- 性别字段可能只允许特定的值，如"男"、"女"。
|
||||
- 价格字段在列车车票表中应该是非负的。
|
||||
4. **唯一性约束**：确保某一列或几列组合的值在整个表中是唯一的，避免重复记录。
|
||||
- 身份证号在乘客表中不仅是主键，也需要是唯一的，以确保每个记录代表不同的乘客。
|
||||
5. **用户定义的完整性约束**：确保列中的数据满足特定条件。
|
||||
- 例如，始发时间必须早于到达时间，在列车表和列车车票表中都应该遵守这一规则。
|
||||
|
||||
|
||||
|
||||
## 4. 题目4
|
||||
|
||||
> **请自己寻找安装包，寻找安装和卸载向导，自学建库、卸载及建表方法，完成如下任务：**
|
||||
>
|
||||
> 1. **在自己的电脑上安装好某一版本的MySQL、SQL Server或Oracle，卸载数据库，反复若干次，确保熟练掌握这个过程。**
|
||||
>
|
||||
> 2. **建立一个数据库，随意建立一些数据表，比如通讯录，往表中手动增加一些信息。**
|
||||
>
|
||||
> **通过适当的截图界面，证明你已经熟练掌握以上技术。**
|
||||
|
||||
- 操作系统：Ubuntu 22.04 LTS (6.5.0-25-generic)
|
||||
|
||||
### 4.1. 安装MySQL
|
||||
|
||||
使用apt安装MySQL：
|
||||
|
||||
```sh
|
||||
$ sudo apt update
|
||||
$ sudo apt install mysql-server
|
||||
```
|
||||
|
||||
这时MySQL服务默认已被安装进程开启。开启MySQL服务的命令为：
|
||||
|
||||
```sh
|
||||
$ sudo systemctl start mysql.service
|
||||
```
|
||||
|
||||
进入MySQL修改登录密码（可省略）：
|
||||
|
||||
```sh
|
||||
$ sudo mysql
|
||||
Welcome to the MySQL monitor. Commands end with ; or \g.
|
||||
Your MySQL connection id is 23
|
||||
Server version: 8.0.36-0ubuntu0.22.04.1 (Ubuntu)
|
||||
|
||||
Copyright (c) 2000, 2024, Oracle and/or its affiliates.
|
||||
|
||||
Oracle is a registered trademark of Oracle Corporation and/or its
|
||||
affiliates. Other names may be trademarks of their respective
|
||||
owners.
|
||||
|
||||
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
|
||||
```
|
||||
|
||||
```mysql
|
||||
mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';
|
||||
Query OK, 0 rows affected (0.01 sec)
|
||||
|
||||
mysql> exit
|
||||
Bye
|
||||
```
|
||||
|
||||
使用`mysql_secure_installation`进行配置
|
||||
|
||||
```sh
|
||||
$ sudo mysql_secure_installation
|
||||
```
|
||||
|
||||
配置过程略。
|
||||
|
||||
卸载MySQL：
|
||||
|
||||
```sh
|
||||
$ sudo apt-get remove mysql-common
|
||||
$ sudo apt-get autoremove --purge mysql-server-8.0
|
||||
```
|
||||
|
||||
查看残留包，逐个卸载。
|
||||
|
||||
```sh
|
||||
$ dpkg --list | grep mysql
|
||||
```
|
||||
|
||||
清除残留数据：
|
||||
|
||||
```sh
|
||||
$ dpkg -l | grep ^rc | awk '{print $2}' | sudo xargs dpkg -P
|
||||
```
|
||||
|
||||
### 4.2. 操作数据库
|
||||
|
||||
登录MySQL：
|
||||
|
||||
```sh
|
||||
$ sudo mysql -p
|
||||
Enter password:
|
||||
Welcome to the MySQL monitor. Commands end with ; or \g.
|
||||
Your MySQL connection id is 24
|
||||
Server version: 8.0.36-0ubuntu0.22.04.1 (Ubuntu)
|
||||
|
||||
Copyright (c) 2000, 2024, Oracle and/or its affiliates.
|
||||
|
||||
Oracle is a registered trademark of Oracle Corporation and/or its
|
||||
affiliates. Other names may be trademarks of their respective
|
||||
owners.
|
||||
|
||||
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
|
||||
|
||||
mysql>
|
||||
```
|
||||
|
||||
查看已有数据库：
|
||||
|
||||
```mysql
|
||||
mysql> SHOW DATABASES;
|
||||
+--------------------+
|
||||
| Database |
|
||||
+--------------------+
|
||||
| information_schema |
|
||||
| mysql |
|
||||
| performance_schema |
|
||||
| sys |
|
||||
+--------------------+
|
||||
4 rows in set (0.00 sec)
|
||||
```
|
||||
|
||||
创建新数据库：
|
||||
|
||||
```mysql
|
||||
mysql> CREATE DATABASE MyDB;
|
||||
Query OK, 1 row affected (0.02 sec)
|
||||
```
|
||||
|
||||
修改数据库字符集，以便支持中文：
|
||||
|
||||
```mysql
|
||||
mysql> ALTER DATABASE MyDB CHARACTER SET utf8;
|
||||
Query OK, 1 row affected, 1 warning (0.04 sec)
|
||||
```
|
||||
|
||||
查看及切换数据库：
|
||||
|
||||
```mysql
|
||||
mysql> SHOW DATABASES;
|
||||
+--------------------+
|
||||
| Database |
|
||||
+--------------------+
|
||||
| MyDB |
|
||||
| information_schema |
|
||||
| mysql |
|
||||
| performance_schema |
|
||||
| sys |
|
||||
+--------------------+
|
||||
5 rows in set (0.00 sec)
|
||||
|
||||
mysql> USE MyDB;
|
||||
Database changed
|
||||
mysql> SHOW TABLES;
|
||||
Empty set (0.00 sec)
|
||||
```
|
||||
|
||||
创建表：
|
||||
|
||||
```mysql
|
||||
mysql> CREATE TABLE BOOK (
|
||||
-> ISBN CHAR(30) PRIMARY KEY,
|
||||
-> NAME VARCHAR(30) NOT NULL,
|
||||
-> AUTHOR VARCHAR(30),
|
||||
-> PUBLISHER VARCHAR(30),
|
||||
-> PRICE FLOAT(2)
|
||||
-> );
|
||||
Query OK, 0 rows affected (0.06 sec)
|
||||
|
||||
mysql> SHOW TABLES;
|
||||
+----------------+
|
||||
| Tables_in_MyDB |
|
||||
+----------------+
|
||||
| BOOK |
|
||||
+----------------+
|
||||
1 row in set (0.00 sec)
|
||||
|
||||
mysql> DESC BOOK;
|
||||
+-----------+-------------+------+-----+---------+-------+
|
||||
| Field | Type | Null | Key | Default | Extra |
|
||||
+-----------+-------------+------+-----+---------+-------+
|
||||
| ISBN | char(30) | NO | PRI | NULL | |
|
||||
| NAME | varchar(30) | NO | | NULL | |
|
||||
| AUTHOR | varchar(30) | YES | | NULL | |
|
||||
| PUBLISHER | varchar(30) | YES | | NULL | |
|
||||
| PRICE | float | YES | | NULL | |
|
||||
+-----------+-------------+------+-----+---------+-------+
|
||||
5 rows in set (0.00 sec)
|
||||
```
|
||||
|
||||
添加一列：
|
||||
|
||||
```sh
|
||||
mysql> ALTER TABLE BOOK
|
||||
-> ADD COLUMN PUBLISH_YEAR YEAR;
|
||||
Query OK, 0 rows affected (0.04 sec)
|
||||
Records: 0 Duplicates: 0 Warnings: 0
|
||||
|
||||
mysql> DESC BOOK;
|
||||
+--------------+-------------+------+-----+---------+-------+
|
||||
| Field | Type | Null | Key | Default | Extra |
|
||||
+--------------+-------------+------+-----+---------+-------+
|
||||
| ISBN | char(30) | NO | PRI | NULL | |
|
||||
| NAME | varchar(30) | NO | | NULL | |
|
||||
| AUTHOR | varchar(30) | YES | | NULL | |
|
||||
| PUBLISHER | varchar(30) | YES | | NULL | |
|
||||
| PRICE | float | YES | | NULL | |
|
||||
| PUBLISH_YEAR | year | YES | | NULL | |
|
||||
+--------------+-------------+------+-----+---------+-------+
|
||||
6 rows in set (0.00 sec)
|
||||
|
||||
mysql> SELECT * FROM BOOK;
|
||||
Empty set (0.00 sec)
|
||||
```
|
||||
|
||||
添加完整性约束：
|
||||
|
||||
```mysql
|
||||
mysql> ALTER TABLE BOOK
|
||||
-> ADD CONSTRAINT price_positive CHECK (PRICE > 0);
|
||||
Query OK, 0 rows affected (0.10 sec)
|
||||
Records: 0 Duplicates: 0 Warnings: 0
|
||||
```
|
||||
|
||||
添加记录：
|
||||
|
||||
```mysql
|
||||
mysql> INSERT INTO BOOK (ISBN, NAME, AUTHOR, PUBLISHER, PRICE, PUBLISH_YEAR)
|
||||
-> VALUES ('978-7-302-42328-7', '机器学习', '周志华', '清华大学出版社', 108.00, '2016'),
|
||||
-> ('978-7-111-68181-6', '数据库系统概念', 'Silberschatz et al.', '机械工业出版社', 149.00, '2021');
|
||||
Query OK, 2 rows affected (0.26 sec)
|
||||
Records: 2 Duplicates: 0 Warnings: 0
|
||||
```
|
||||
|
||||
查看表内容：
|
||||
|
||||
|
||||
|
||||
继续添加记录：
|
||||
|
||||
```mysql
|
||||
mysql> INSERT INTO BOOK (ISBN, NAME, PUBLISHER, PRICE, PUBLISH_YEAR)
|
||||
-> VALUES ('978-7-111-59971-5', '计算机网络：自顶向下方法', '机械工业出版社', 89.00, '2018'),
|
||||
-> ('978-7-121-43307-8', '数字图像处理学', '电子工业出版社', 199.80, '2022');
|
||||
Query OK, 2 rows affected (0.01 sec)
|
||||
Records: 2 Duplicates: 0 Warnings: 0
|
||||
```
|
||||
|
||||
查看表内容：
|
||||
|
||||
|
||||
|
||||
其中`AUTHOR`属性默认为`NULL`。
|
||||
|
||||
删除记录：
|
||||
|
||||
```mysql
|
||||
mysql> DELETE FROM BOOK
|
||||
-> WHERE PUBLISHER = '机械工业出版社';
|
||||
Query OK, 2 rows affected (0.45 sec)
|
||||
```
|
||||
|
||||
查看表内容：
|
||||
|
||||
|
||||
|
||||
可见成功删除了两条`PUBLISHER = '机械工业出版社'`的记录。
|
||||
|
||||
删除表：
|
||||
|
||||
```mysql
|
||||
mysql> DROP TABLE BOOK;
|
||||
Query OK, 0 rows affected (0.37 sec)
|
||||
|
||||
mysql> SHOW TABLES;
|
||||
Empty set (0.00 sec)
|
||||
```
|
||||
|
||||
删库~~跑路~~：
|
||||
|
||||
```mysql
|
||||
mysql> DROP DATABASE MyDB;
|
||||
Query OK, 0 rows affected (0.03 sec)
|
||||
|
||||
mysql> SELECT DATABASE();
|
||||
+------------+
|
||||
| DATABASE() |
|
||||
+------------+
|
||||
| NULL |
|
||||
+------------+
|
||||
1 row in set (0.00 sec)
|
||||
```
|
||||
|
||||
BIN
Assignments/Assignment1/source/作业1_21281280_柯劲帆.pdf
Normal file
BIN
Assignments/Assignment1/source/作业1_21281280_柯劲帆.pdf
Normal file
Binary file not shown.
BIN
Assignments/Assignment1/source/查看表.png
Normal file
BIN
Assignments/Assignment1/source/查看表.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 562 KiB |
BIN
Assignments/Assignment1/source/查看表2.png
Normal file
BIN
Assignments/Assignment1/source/查看表2.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 679 KiB |
BIN
Assignments/Assignment1/source/查看表3.png
Normal file
BIN
Assignments/Assignment1/source/查看表3.png
Normal file
Binary file not shown.
|
After Width: | Height: | Size: 367 KiB |
63
Assignments/Assignment1/source/语义网络1.drawio
Normal file
63
Assignments/Assignment1/source/语义网络1.drawio
Normal file
@ -0,0 +1,63 @@
|
||||
<mxfile host="Electron" modified="2024-03-11T12:29:44.731Z" agent="Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) draw.io/24.0.4 Chrome/120.0.6099.109 Electron/28.1.0 Safari/537.36" etag="eMP4GevldZwEaCXYciuw" version="24.0.4" type="device">
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<diagram id="prtHgNgQTEPvFCAcTncT" name="Page-1">
|
||||
<mxGraphModel dx="1418" dy="820" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="0" pageScale="1" pageWidth="827" pageHeight="1169" math="0" shadow="0">
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<root>
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<mxCell id="0" />
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<mxCell id="1" parent="0" />
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<mxCell id="dNxyNK7c78bLwvsdeMH5-11" value="数据库软件" style="swimlane;html=1;startSize=20;horizontal=1;containerType=tree;glass=0;" parent="1" vertex="1">
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||||
<mxGeometry x="400" y="120" width="240" height="380" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-1" value="数据库" style="swimlane;html=1;startSize=20;horizontal=1;containerType=tree;glass=0;" parent="dNxyNK7c78bLwvsdeMH5-11" vertex="1">
|
||||
<mxGeometry x="40" y="40" width="160" height="120" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-2" value="数据" style="rounded=0;whiteSpace=wrap;html=1;" parent="giAqJahfSQoaLCHjyE3S-1" vertex="1">
|
||||
<mxGeometry x="20" y="40" width="120" height="20" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-3" value="数据" style="rounded=0;whiteSpace=wrap;html=1;" parent="giAqJahfSQoaLCHjyE3S-1" vertex="1">
|
||||
<mxGeometry x="20" y="70" width="120" height="20" as="geometry" />
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||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-8" value="<svg style="vertical-align: 0px;" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 -120 1172 120" role="img" height="0.271ex" width="2.652ex" xmlns="http://www.w3.org/2000/svg"><defs><path d="M78 60Q78 84 95 102T138 120Q162 120 180 104T199 61Q199 36 182 18T139 0T96 17T78 60ZM525 60Q525 84 542 102T585 120Q609 120 627 104T646 61Q646 36 629 18T586 0T543 17T525 60ZM972 60Q972 84 989 102T1032 120Q1056 120 1074 104T1093 61Q1093 36 1076 18T1033 0T990 17T972 60Z" id="MJX-2-TEX-N-2026"></path></defs><g transform="scale(1,-1)" stroke-width="0" fill="currentColor" stroke="currentColor"><g data-mml-node="math"><g data-mml-node="mo"><use xlink:href="#MJX-2-TEX-N-2026" data-c="2026"></use></g></g></g></svg>" style="text;html=1;align=center;verticalAlign=middle;resizable=0;points=[];autosize=1;strokeColor=none;fillColor=none;" parent="giAqJahfSQoaLCHjyE3S-1" vertex="1">
|
||||
<mxGeometry x="60" y="90" width="40" height="30" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-7" value="管理" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=0;exitDx=0;exitDy=0;entryX=0.5;entryY=1;entryDx=0;entryDy=0;" parent="dNxyNK7c78bLwvsdeMH5-11" source="giAqJahfSQoaLCHjyE3S-6" target="giAqJahfSQoaLCHjyE3S-1" edge="1">
|
||||
<mxGeometry y="-20" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
</mxGeometry>
|
||||
</mxCell>
|
||||
<mxCell id="rgB_FiIPzrIPtq7C7b9a-3" value="管理" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;entryX=0.5;entryY=0;entryDx=0;entryDy=0;endArrow=classic;endFill=1;startArrow=none;startFill=0;" edge="1" parent="dNxyNK7c78bLwvsdeMH5-11" source="giAqJahfSQoaLCHjyE3S-6" target="rgB_FiIPzrIPtq7C7b9a-2">
|
||||
<mxGeometry y="20" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
</mxGeometry>
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-6" value="数据库管理系统" style="rounded=0;whiteSpace=wrap;html=1;" parent="dNxyNK7c78bLwvsdeMH5-11" vertex="1">
|
||||
<mxGeometry x="40" y="200" width="160" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="rgB_FiIPzrIPtq7C7b9a-2" value="应用系统" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="dNxyNK7c78bLwvsdeMH5-11">
|
||||
<mxGeometry x="40" y="300" width="160" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-5" value="设计数据库的结构" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=1;exitY=0.5;exitDx=0;exitDy=0;entryX=0;entryY=0.5;entryDx=0;entryDy=0;" parent="1" source="giAqJahfSQoaLCHjyE3S-4" target="giAqJahfSQoaLCHjyE3S-1" edge="1">
|
||||
<mxGeometry x="-0.125" y="10" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
</mxGeometry>
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-4" value="数据模型" style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
|
||||
<mxGeometry x="160" y="190" width="120" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="giAqJahfSQoaLCHjyE3S-10" value="模型" style="swimlane;html=1;startSize=20;horizontal=1;containerType=tree;glass=0;" parent="1" vertex="1">
|
||||
<mxGeometry x="140" y="160" width="160" height="100" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="rgB_FiIPzrIPtq7C7b9a-7" value="" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;" edge="1" parent="1" source="rgB_FiIPzrIPtq7C7b9a-4" target="rgB_FiIPzrIPtq7C7b9a-2">
|
||||
<mxGeometry relative="1" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="rgB_FiIPzrIPtq7C7b9a-4" value="用户" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
|
||||
<mxGeometry x="440" y="520" width="160" height="60" as="geometry" />
|
||||
</mxCell>
|
||||
<mxCell id="rgB_FiIPzrIPtq7C7b9a-6" value="交互" style="edgeStyle=orthogonalEdgeStyle;rounded=0;orthogonalLoop=1;jettySize=auto;html=1;exitX=0.5;exitY=1;exitDx=0;exitDy=0;startArrow=classic;startFill=1;" edge="1" parent="1" source="rgB_FiIPzrIPtq7C7b9a-2" target="rgB_FiIPzrIPtq7C7b9a-4">
|
||||
<mxGeometry y="20" relative="1" as="geometry">
|
||||
<mxPoint as="offset" />
|
||||
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4
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Assignments/Assignment1/source/语义网络2.drawio.svg
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Assignments/Assignment1/作业1_21281280_柯劲帆.pdf
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Assignments/Assignment1/作业1_21281280_柯劲帆.pdf
Normal file
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Reference in New Issue
Block a user