idea--4.父子工程
在IT行业中，开发工具的选择对效率有着至关重要的影响，IntelliJ IDEA（简称Idea）作为一款强大的Java集成开发环境，被广泛应用于各种项目开发。本主题将详细讲解如何在Idea中设置和管理父子工程，同时结合MyBatis框架进行深入探讨。
让我们理解父子工程的概念。在大型项目中，为了更好地组织代码、提高代码复用性和管理复杂性，我们常常会将项目分解为多个独立的模块，这些模块之间存在依赖关系，形成了父子工程的结构。父工程主要负责提供公共的配置和依赖管理，子工程则继承父工程的配置，并在此基础上添加自己的特定功能。
在Idea中，创建父子工程的过程如下：
1. 打开Idea，选择"File" -> "New" -> "Project"。
2. 在新建项目向导中，选择"Maven"，然后点击"Next"。
3. 填写项目的Group ID、Artifact ID和Version，这些是Maven项目的标识。
4. 在"Project name"和"Project location"中指定项目名称和存储位置。
5. 在"Maven Projects"选项卡下，勾选"Create module"，然后为子工程填写相应的Group ID、Artifact ID和Version。
6. 完成上述步骤后，Idea会自动生成一个包含父工程和子工程的项目结构。
接下来，我们将讨论如何在父子工程中引入MyBatis框架。MyBatis是一个优秀的持久层框架，它支持定制化SQL、存储过程以及高级映射。引入MyBatis到父子工程的步骤如下：
1. 在父工程的pom.xml文件中，添加MyBatis和其依赖的数据库驱动器的依赖，例如：
```xml
org.mybatis
mybatis
3.4.6
mysql
mysql-connector-java
8.0.22
```
这样，所有子工程都将继承这些依赖。
2. 在子工程中，创建MyBatis的相关配置，如mybatis-config.xml和mapper文件。mybatis-config.xml用于全局配置，包括数据源、事务管理等。mapper文件则包含具体的SQL语句和映射规则。
3. 创建Service层和DAO层，定义业务逻辑和服务接口。在DAO层，通过MyBatis的SqlSession和Mapper接口进行数据操作。
4. 配置Spring与MyBatis的整合，通过Spring的MyBatisSqlSessionFactoryBean和MapperScannerConfigurer来实现。
5. 在测试或者实际运行时，确保数据库连接配置正确，可以通过Spring的JdbcTemplate或MyBatis的SqlSession执行SQL，完成数据的CRUD操作。
总结一下，Idea中的父子工程机制有助于我们管理和组织复杂的项目结构，而MyBatis框架则提供了灵活的数据库访问能力。在实际开发中，我们需要根据项目需求，合理地划分父子工程，充分利用MyBatis的特性，编写高效、可维护的代码。同时，不断学习和掌握Idea的更多功能，可以进一步提升开发效率。
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