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
This commit is contained in:
commit
2bd2d6f49e
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.gitignore
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.gitignore
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target/
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!.mvn/wrapper/maven-wrapper.jar
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!**/src/main/**/target/
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!**/src/test/**/target/
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### IntelliJ IDEA ###
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.idea/modules.xml
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.idea/jarRepositories.xml
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.idea/compiler.xml
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.idea/libraries/
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*.iws
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*.iml
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*.ipr
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### Eclipse ###
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.apt_generated
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.factorypath
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.project
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.settings
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.springBeans
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.sts4-cache
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### NetBeans ###
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/nbproject/private/
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/nbbuild/
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/dist/
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/nbdist/
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/.nb-gradle/
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build/
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!**/src/main/**/build/
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!**/src/test/**/build/
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### VS Code ###
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.vscode/
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### Mac OS ###
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.DS_Store
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8
.idea/.gitignore
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# 默认忽略的文件
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/shelf/
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/workspace.xml
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<driver-ref>mysql.8</driver-ref>
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<synchronize>true</synchronize>
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7
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.idea/encodings.xml
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71
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.idea/inspectionProfiles/Project_Default.xml
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14
.idea/misc.xml
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.idea/misc.xml
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||||
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||||
6
.idea/sqldialects.xml
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6
.idea/sqldialects.xml
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<?xml version="1.0" encoding="UTF-8"?>
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||||
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||||
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||||
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||||
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124
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124
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||||
<?xml version="1.0" encoding="UTF-8"?>
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|
||||
<item class="javax.swing.JToolBar" icon="/com/intellij/uiDesigner/icons/toolbar.svg" removable="false" auto-create-binding="false" can-attach-label="false">
|
||||
<default-constraints vsize-policy="0" hsize-policy="6" anchor="0" fill="1">
|
||||
<preferred-size width="-1" height="20" />
|
||||
</default-constraints>
|
||||
</item>
|
||||
<item class="javax.swing.JToolBar$Separator" icon="/com/intellij/uiDesigner/icons/toolbarSeparator.svg" removable="false" auto-create-binding="false" can-attach-label="false">
|
||||
<default-constraints vsize-policy="0" hsize-policy="0" anchor="0" fill="1" />
|
||||
</item>
|
||||
<item class="javax.swing.JScrollBar" icon="/com/intellij/uiDesigner/icons/scrollbar.svg" removable="false" auto-create-binding="true" can-attach-label="false">
|
||||
<default-constraints vsize-policy="6" hsize-policy="0" anchor="0" fill="2" />
|
||||
</item>
|
||||
</group>
|
||||
</component>
|
||||
</project>
|
||||
6
.idea/vcs.xml
generated
Normal file
6
.idea/vcs.xml
generated
Normal file
@ -0,0 +1,6 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<project version="4">
|
||||
<component name="VcsDirectoryMappings">
|
||||
<mapping directory="$PROJECT_DIR$" vcs="Git" />
|
||||
</component>
|
||||
</project>
|
||||
39
README.md
Normal file
39
README.md
Normal file
@ -0,0 +1,39 @@
|
||||
# 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
|
||||
28
pom.xml
Normal file
28
pom.xml
Normal file
@ -0,0 +1,28 @@
|
||||
<?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>cn.ssm</groupId>
|
||||
<artifactId>DC_JavaWeb2</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>mysql</groupId>
|
||||
<artifactId>mysql-connector-java</artifactId>
|
||||
<version>8.0.33</version>
|
||||
</dependency>
|
||||
<dependency>
|
||||
<groupId>org.mybatis</groupId>
|
||||
<artifactId>mybatis</artifactId>
|
||||
<version>3.5.13</version>
|
||||
</dependency>
|
||||
</dependencies>
|
||||
</project>
|
||||
10
src/main/java/cn/ssm/Main.java
Normal file
10
src/main/java/cn/ssm/Main.java
Normal file
@ -0,0 +1,10 @@
|
||||
package cn.ssm;
|
||||
|
||||
/**
|
||||
* @author 32841
|
||||
*/
|
||||
public class Main {
|
||||
public static void main(String[] args) {
|
||||
System.out.println("Hello world!");
|
||||
}
|
||||
}
|
||||
34
src/main/java/cn/ssm/domian/User.java
Normal file
34
src/main/java/cn/ssm/domian/User.java
Normal file
@ -0,0 +1,34 @@
|
||||
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 +
|
||||
'}';
|
||||
}
|
||||
}
|
||||
55
src/main/java/cn/ssm/test/JDBCTest.java
Normal file
55
src/main/java/cn/ssm/test/JDBCTest.java
Normal file
@ -0,0 +1,55 @@
|
||||
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();
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
32
src/main/java/cn/ssm/test/MybatisTest.java
Normal file
32
src/main/java/cn/ssm/test/MybatisTest.java
Normal file
@ -0,0 +1,32 @@
|
||||
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);
|
||||
}
|
||||
}
|
||||
13
src/main/resources/mappers/MyMapper.xml
Normal file
13
src/main/resources/mappers/MyMapper.xml
Normal file
@ -0,0 +1,13 @@
|
||||
<?xml version="1.0" encoding="UTF-8" ?>
|
||||
<!DOCTYPE mapper
|
||||
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
|
||||
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
|
||||
<!-- mapper:根标签，namespace：命名空间，随便写，一般保证命名空间唯一 -->
|
||||
<mapper namespace="MyMapper">
|
||||
<!-- statement，内容：sql语句。id：唯一标识，随便写，在同一个命名空间下保持唯一
|
||||
resultType：sql语句查询结果集的封装类型,tb_user即为数据库中的表
|
||||
-->
|
||||
<select id="selectUser" resultType="cn.ssm.domian.User">
|
||||
select * from tb_user where id = #{id}
|
||||
</select>
|
||||
</mapper>
|
||||
44
src/main/resources/mybatis-config.xml
Normal file
44
src/main/resources/mybatis-config.xml
Normal file
@ -0,0 +1,44 @@
|
||||
<?xml version="1.0" encoding="UTF-8" ?>
|
||||
<!DOCTYPE configuration
|
||||
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
|
||||
"http://mybatis.org/dtd/mybatis-3-config.dtd">
|
||||
<!-- 根标签 -->
|
||||
<configuration>
|
||||
<properties>
|
||||
<property name="driver" value="com.mysql.jdbc.Driver"/>
|
||||
<property name="url" value="jdbc:mysql://127.0.0.1:3306/ssmdemo?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true"/>
|
||||
<property name="username" value="root"/>
|
||||
<property name="password" value="root"/>
|
||||
</properties>
|
||||
|
||||
<!-- 环境，可以配置多个，default：指定采用哪个环境 -->
|
||||
<environments default="test">
|
||||
<!-- id：唯一标识 -->
|
||||
<environment id="test">
|
||||
<!-- 事务管理器，JDBC类型的事务管理器 -->
|
||||
<transactionManager type="JDBC" />
|
||||
<!-- 数据源，池类型的数据源 -->
|
||||
<dataSource type="POOLED">
|
||||
<property name="driver" value="com.mysql.cj.jdbc.Driver" />
|
||||
<property name="url" value="jdbc:mysql://127.0.0.1:3306/ssmdemo" />
|
||||
<property name="username" value="root" />
|
||||
<property name="password" value="dcsy961618762" />
|
||||
</dataSource>
|
||||
</environment>
|
||||
<environment id="development">
|
||||
<!-- 事务管理器，JDBC类型的事务管理器 -->
|
||||
<transactionManager type="JDBC" />
|
||||
<!-- 数据源，池类型的数据源 -->
|
||||
<dataSource type="POOLED">
|
||||
<property name="driver" value="${driver}" /> <!-- 配置了properties，所以可以直接引用 -->
|
||||
<property name="url" value="${url}" />
|
||||
<property name="username" value="${username}" />
|
||||
<property name="password" value="${password}" />
|
||||
</dataSource>
|
||||
</environment>
|
||||
</environments>
|
||||
<mappers>
|
||||
<!--这是使用包内的映射器文件-->
|
||||
<mapper resource="mappers/MyMapper.xml" />
|
||||
</mappers>
|
||||
</configuration>
|
||||
Loading…
x
Reference in New Issue
Block a user