MyBatis 环境搭建配置全过程【IDEA】

在IDEA中搭建MyBatis的环境需要以下步骤：

1. 创建一个新的Maven项目。
2. 添加MyBatis和数据库驱动的依赖。
3. 创建实体类、接口、Mapper文件和数据库配置文件。

以下是相关的配置文件和代码示例：

pom.xml中添加依赖

<dependencies>
    <!-- MyBatis -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.6</version>
    </dependency>
    <!-- MySQL 数据库驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.23</version>
    </dependency>
</dependencies>

实体类示例

public class User {
    private Integer id;
    private String name;
    // 省略getter和setter方法
}

Mapper接口示例

public interface UserMapper {
    User selectUserById(Integer id);
}

Mapper XML配置文件

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.mapper.UserMapper">
    <select id="selectUserById" parameterType="Integer" resultType="com.example.entity.User">
        SELECT * FROM users WHERE id = #{id}
    </select>
</mapper>

MyBatis配置文件

<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/myapp"/>
                <property name="username" value="root"/>
                <property name="password" value="password"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="com/example/mapper/UserMapper.xml"/>
    </mappers>
</configuration>

测试类示例

public class MyBatisTest {
    public static void main(String[] args) throws IOException {
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader("mybatis-config.xml"));
        Sql