更新笔记属性
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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JDBC(Java Database Connectivity)
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是一个独立于特定数据库管理系统、通用的SQL数据库存取和操作的公共接口（一组API），定义了用来访问数据库的标准Java类库，（java.sql,javax.sql）使用这些类库可以以一种标准的方法、方便地访问数据库资源。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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JDBC接口（API）包括两个层次：
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面向应用的API：Java API，抽象接口，供应用程序开发人员使用（连接数据库，执行SQL语句，获得结果）。
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@@ -1,3 +1,10 @@
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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## 第一种方式
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这种方式注册的驱动数据最原始的方式，不常用
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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| ResultSet | executeQuery(String sql) <br />执行给定的 SQL 语句，该语句返回单个 ResultSet 对象。 |
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|-----------|-------------------------------------------------------------------|
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@@ -1,3 +1,10 @@
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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## PreparedStatement的使用
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- 可以通过调用 Connection 对象的 preparedStatement(String sql) 方法获取 PreparedStatement 对象
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---
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date: 2025-01-19
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tags:
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- JDBC
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- Notes
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lastUpdated: 2025-01-20T10:10:00
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---
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## JDBC中的事务
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JDBC中的默认事务是自动提交
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## sql、DB、DBMS分别是什么，他们之间的关系？
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DB:
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 卸载MySQL
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1. 双击安装包，点击下一步，然后点击remove。卸载。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 常用命令
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退出MySQL：exit;
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 简单查询（DQL）
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语法格式：select 字段名1 ，字段名2 ，字段名3，。。。From 表名；
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 条件查询
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语法：
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 排序
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语法：
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 分组函数（多行处理函数）
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多行处理函数特点：输入多行，输出结果是一行
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 连接查询分类
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根据语法出现年代划分：
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 表的创建
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建表语句：
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 删表
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```sql
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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语法：
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```sql
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 约束和常见约束
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在创建表时可以添加约束，可以给表的字段增加约束，添加约束的目的是为了表中数据的完整性、合法性、唯一性
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 存储引擎和字符集
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MySQL 默认存储引擎是 InnoDB 方式。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 事务概述
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一个事务时一个完整的逻辑单元，不可再分。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 索引作用
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相当于一本书的目录。
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 什么是视图
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视图是一种根据查询（也就是SELECT表达式）定义的数据库对象，用于获取想要看到和使用的局部数据。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 什么是三范式
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设计表的依据，按照这个三范式设计的表不会出现数据冗余。
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@@ -1,3 +1,11 @@
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---
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date: 2025-01-19
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tags:
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- Notes
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- MySql
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lastUpdated: 2025-01-20T10:10:00
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---
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## 练习
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基础：
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