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syx_computer
2025-10-24 15:47:09 +08:00
parent d3477a1eec
commit 741a50ad53
18 changed files with 586 additions and 3 deletions
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38
06. 后端Web基础(java操作数据库)/jdbc-demo/.gitignore vendored Normal file
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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

8
06. 后端Web基础(java操作数据库)/jdbc-demo/.idea/.gitignore generated vendored Normal file
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# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml

7
06. 后端Web基础(java操作数据库)/jdbc-demo/.idea/encodings.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Encoding">
<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
</component>
</project>

14
06. 后端Web基础(java操作数据库)/jdbc-demo/.idea/misc.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="MavenProjectsManager">
<option name="originalFiles">
<list>
<option value="$PROJECT_DIR$/pom.xml" />
</list>
</option>
</component>
<component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="corretto-17" project-jdk-type="JavaSDK">
<output url="file://$PROJECT_DIR$/out" />
</component>
</project>

6
06. 后端Web基础(java操作数据库)/jdbc-demo/.idea/vcs.xml generated Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="$PROJECT_DIR$/../.." vcs="Git" />
</component>
</project>

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06. 后端Web基础(java操作数据库)/jdbc-demo/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.itheima</groupId>
<artifactId>jdbc-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>com.mysql</groupId>
<artifactId>mysql-connector-j</artifactId>
<version>8.0.33</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>5.9.3</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.30</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>RELEASE</version>
<scope>compile</scope>
</dependency>
</dependencies>
</project>

18
06. 后端Web基础(java操作数据库)/jdbc-demo/src/main/java/com/itheima/pojo/User.java Normal file
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package com.itheima.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private Integer id;
private String username;
private String password;
private String name;
private Integer age;
}

70
06. 后端Web基础(java操作数据库)/jdbc-demo/src/main/java/org/itheima/JdbcTest.java Normal file
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package org.itheima;
import com.itheima.pojo.User;
import org.junit.Test;
import java.sql.*;
public class JdbcTest {
@Test
public void testUpdate() throws Exception {
//1.注册驱动
Class.forName("com.mysql.cj.jdbc.Driver");
//2.获取连接
String url = "jdbc:mysql://localhost:3306/web01";
String username = "root";
String password = "123456";
Connection connection = DriverManager.getConnection(url, username, password);
//3.获取数据库操作对象
Statement statement = connection.createStatement();
//4.执行sql语句
int i = statement.executeUpdate("update user set age = 25 where id = 1");//DML
System.out.println("SQL执行完毕" + i);
//5.释放资源
statement.close();
connection.close();
}
@Test
public void testSelect() throws Exception {
String url = "jdbc:mysql://localhost:3306/web01";
String username = "root";
String password = "123456";
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null; //封装查询返回的结果集
try {
//1.注册驱动
Class.forName("com.mysql.cj.jdbc.Driver");
//2.获取连接
conn = DriverManager.getConnection(url, username, password);
//3.执行查询
String sql = "select id, username, password, name, age FROM user WHERE username = ? AMD password = ?";
stmt = conn.prepareStatement(sql);
stmt.setString(1, "daqiao");
stmt.setString(2, "123456");
rs = stmt.executeQuery();
//4.处理结果
while (rs.next()) {
User user = new User(
rs.getInt("id"),
rs.getString("username"),
rs.getString("password"),
rs.getString("name"),
rs.getInt("age")
);
System.out.println(user);
}
}
}
}