commit 2bd2d6f49e26a21dc5ae771cfcf4c11dbb9b1f8d
Author: DC_DC <3284155190@qq.com>
Date: Fri Nov 24 22:10:59 2023 +0800
初始版本
实现了简单的JDBC操作数据库语法
并进阶使用mybatis来操作数据库
diff --git a/.gitignore b/.gitignore
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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store
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diff --git a/.idea/.gitignore b/.idea/.gitignore
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+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
diff --git a/.idea/dataSources.xml b/.idea/dataSources.xml
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+
+
+
+
+ mysql.8
+ true
+ com.mysql.cj.jdbc.Driver
+ jdbc:mysql://localhost:3306/ssmdemo
+ $ProjectFileDir$
+
+
+
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diff --git a/.idea/sqldialects.xml b/.idea/sqldialects.xml
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diff --git a/README.md b/README.md
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+# 项目流程概述
+- 创建maven工程
+## 回顾JDBC
+1. 在pom.xml中使用标签引入MySQL依赖包
+2. 准备数据库示例数据
+3. 编写JDBC测试类
+ 1. 加载数据库驱动（新旧版本有区别）
+ 2. 获取连接（使用数据库地址、用户名、密码）
+ 3. 执行SQL语句（此处可以加上防注入处理）
+ 4. 对查询数据返回的数据集进行处理，可以输出到控制台
+ 5. 关闭连接、释放资源
+## 使用Mybatis
+1. 添加Maven依赖
+ 在pom.xml中使用标签引入依赖包
+ - mybatis
+ - mysql
+2. 创建配置文件mybatis-config.xml
+ - 属性配置
+ - 驱动
+ - 数据库地址
+ - 用户名
+ - 密码
+ - 环境配置
+ - 默认环境
+ - 其他环境
+ - 映射器
+ - 指定包名（路径、URL）
+3. 创建映射器接口
+ - 创建接口，方法名和参数要与映射文件中SQL语句一一对应
+4. 编写SQL映射文件
+ 在MyMapper.xml中编写
+ 1. 命名空间和唯一标识
+ 作为参数传入`sqlSession`对象方法中
+ 2. SQL语句
+ 操作CRUD，注意映射类型`resultType`
+5. 创建数据模型
+ 数据模型和映射器接口有所不同，可以没有映射器接口但是必须有数据模型，即Java类
+6. 编写业务逻辑代码
+ in your showtime
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diff --git a/pom.xml b/pom.xml
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+++ b/pom.xml
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+
+
+ 4.0.0
+
+ cn.ssm
+ DC_JavaWeb2
+ 1.0-SNAPSHOT
+
+
+ 17
+ 17
+ UTF-8
+
+
+
+ mysql
+ mysql-connector-java
+ 8.0.33
+
+
+ org.mybatis
+ mybatis
+ 3.5.13
+
+
+
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diff --git a/src/main/java/cn/ssm/Main.java b/src/main/java/cn/ssm/Main.java
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+package cn.ssm;
+
+/**
+ * @author 32841
+ */
+public class Main {
+ public static void main(String[] args) {
+ System.out.println("Hello world!");
+ }
+}
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diff --git a/src/main/java/cn/ssm/domian/User.java b/src/main/java/cn/ssm/domian/User.java
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+package cn.ssm.domian;
+
+import java.util.Date;
+
+/**
+ * @author 32841
+ */
+public class User {
+ Integer id;
+ String user_name;
+ String password;
+ String name;
+ Integer age;
+ Integer sex;
+ Date birthday;
+ Date created;
+ Date updated;
+
+
+ @Override
+ public String toString() {
+ return "User{" +
+ "id=" + id +
+ ", userName='" + user_name + '\'' +
+ ", password='" + password + '\'' +
+ ", name='" + name + '\'' +
+ ", age=" + age +
+ ", sex=" + sex +
+ ", birthday=" + birthday +
+ ", created=" + created +
+ ", updated=" + updated +
+ '}';
+ }
+}
diff --git a/src/main/java/cn/ssm/test/JDBCTest.java b/src/main/java/cn/ssm/test/JDBCTest.java
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+package cn.ssm.test;
+
+/*
+* 导入Java中数据库的接口
+* */
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+
+/**
+ * @author 32841
+ */
+public class JDBCTest {
+ public static void main(String[] args) throws Exception { // 添加抛出异常到方法签名
+ Connection connection = null; // 使定义数据库连接对象
+ PreparedStatement prepareStatement = null; // 定义执行SQL语句的对象
+ ResultSet rs = null; // 定义数据库返回结果集对象
+
+ try {
+ // 加载驱动
+ Class.forName("com.mysql.cj.jdbc.Driver");
+ // 获取连接
+ String url = "jdbc:mysql://127.0.0.1:3306/ssmdemo";
+ String user = "root";
+ String password = "dcsy961618762";
+ connection = DriverManager.getConnection(url, user, password);
+ // 获取statement，preparedStatement
+ String sql = "select * from tb_user where id=?"; // 防SQL注入处理
+ prepareStatement = connection.prepareStatement(sql); // 执行SQL语句
+ // 设置参数
+ prepareStatement.setLong(1, 3L); // 设置占位符的值，第一个参数是索引值，第二个是值
+ // 执行查询
+ rs = prepareStatement.executeQuery(); // rs就是数据库查询返回的结果集
+ // 处理结果集
+ while (rs.next()) { // 行指针
+ System.out.println(rs.getString("user_name"));
+ System.out.println(rs.getString("name"));
+ System.out.println(rs.getInt("age"));
+ System.out.println(rs.getDate("birthday"));
+ }
+ } finally {
+ // 关闭连接，释放资源
+ if (rs != null) {
+ rs.close();
+ }
+ if (prepareStatement != null) {
+ prepareStatement.close();
+ }
+ if (connection != null) {
+ connection.close();
+ }
+ }
+ }
+}
diff --git a/src/main/java/cn/ssm/test/MybatisTest.java b/src/main/java/cn/ssm/test/MybatisTest.java
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+package cn.ssm.test;
+
+import cn.ssm.domian.User;
+import org.apache.ibatis.io.Resources;
+import org.apache.ibatis.session.SqlSession;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.apache.ibatis.session.SqlSessionFactoryBuilder;
+
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * @author 32841
+ */
+public class MybatisTest {
+
+ public static void main(String[] args) throws IOException {
+ // 指定全局配置文件
+ String resource = "mybatis-config.xml";
+ // 读取配置文件
+ InputStream inputStream = Resources.getResourceAsStream(resource);
+ // 构建sqlSessionFactory
+ SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
+
+ // 获取sqlSession
+ SqlSession sqlSession = sqlSessionFactory.openSession();
+ // 操作CRUD，第一个参数：指定statement，规则：命名空间+“.”+statementId
+ // 第二个参数：指定传入sql的参数：这里是用户id
+ User user = sqlSession.selectOne("MyMapper.selectUser", 1);
+ System.out.println(user);
+ }
+}
diff --git a/src/main/resources/mappers/MyMapper.xml b/src/main/resources/mappers/MyMapper.xml
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diff --git a/src/main/resources/mybatis-config.xml b/src/main/resources/mybatis-config.xml
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