groovy如何与mybatis协同工作

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作者
筋斗云
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Groovy是一种基于JVM的动态语言,可以与MyBatis框架协同工作。下面是一个简单的示例,展示了如何在Groovy中使用MyBatis进行数据库操作。

  1. 添加依赖

首先,需要在项目中添加Groovy和MyBatis的依赖。在Maven项目的pom.xml文件中添加以下依赖:

<dependencies>     <dependency>         <groupId>org.codehaus.groovy</groupId>         <artifactId>groovy-all</artifactId>         <version>3.0.8</version>     </dependency>     <dependency>         <groupId>org.mybatis</groupId>         <artifactId>mybatis</artifactId>         <version>3.5.7</version>     </dependency>     <dependency>         <groupId>mysql</groupId>         <artifactId>mysql-connector-java</artifactId>         <version>8.0.26</version>     </dependency> </dependencies> 
  1. 创建Groovy脚本

创建一个名为UserMapper.groovy的Groovy脚本,用于定义数据库操作接口:

package com.example  interface UserMapper {     User getUserById(int id)     List<User> getUsers() } 
  1. 创建MyBatis映射文件

resources/mapper目录下创建一个名为UserMapper.xml的文件,用于描述数据库操作的具体实现:

<?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 namespace="com.example.UserMapper">     <select id="getUserById" resultType="com.example.User">         SELECT * FROM user WHERE id = #{id}     </select>      <select id="getUsers" resultType="com.example.User">         SELECT * FROM user     </select> </mapper> 
  1. 创建Groovy服务类

创建一个名为UserService.groovy的Groovy脚本,用于封装数据库操作:

package com.example  import org.apache.ibatis.session.SqlSession import org.apache.ibatis.session.SqlSessionFactory  class UserService {     SqlSessionFactory sqlSessionFactory      UserService(SqlSessionFactory sqlSessionFactory) {         this.sqlSessionFactory = sqlSessionFactory     }      User getUserById(int id) {         try (SqlSession sqlSession = sqlSessionFactory.openSession()) {             UserMapper userMapper = sqlSession.getMapper(UserMapper)             return userMapper.getUserById(id)         }     }      List<User> getUsers() {         try (SqlSession sqlSession = sqlSessionFactory.openSession()) {             UserMapper userMapper = sqlSession.getMapper(UserMapper)             return userMapper.getUsers()         }     } } 
  1. 使用服务类进行数据库操作

在主程序中,创建SqlSessionFactory实例,并使用UserService进行数据库操作:

import com.example.UserService import org.apache.ibatis.io.Resources import org.apache.ibatis.session.SqlSessionFactoryBuilder  public class Main {     public static void main(String[] args) throws Exception {         String resource = "mapper/UserMapper.xml"         try (InputStream inputStream = Resources.getResourceAsStream(resource)) {             SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream)             UserService userService = new UserService(sqlSessionFactory)              User user = userService.getUserById(1)             System.out.println("User: " + user)              List<User> users = userService.getUsers()             System.out.println("Users: " + users)         }     } } 

这样,就可以在Groovy中通过MyBatis进行数据库操作了。

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