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149 lines
4.2 KiB
Markdown
149 lines
4.2 KiB
Markdown
# 快速开始
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在开始之前,我们假定您已经:
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- 熟悉 Java 环境配置及其开发
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- 熟悉 关系型 数据库,比如 MySQL
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## Hello World
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**第 1 步:创建数据库表**
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```sql
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CREATE TABLE IF NOT EXISTS `tb_account`
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(
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`id` INTEGER PRIMARY KEY auto_increment,
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`user_name` VARCHAR(100),
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`age` Integer,
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`birthday` DATETIME
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);
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```
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**第 2 步:创建 java 项目,并添加 Maven/Gradle 依赖**
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Maven示例:
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```xml
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<dependency>
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<groupId>com.mybatis-flex</groupId>
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<artifactId>mybatis-flex-core</artifactId>
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<version>1.4.0</version>
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</dependency>
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<dependency>
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<groupId>com.mybatis-flex</groupId>
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<artifactId>mybatis-flex-processor</artifactId>
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<version>1.4.0</version>
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<scope>provided</scope>
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</dependency>
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```
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> 如果配置了annotationProcessorPaths,此处可以省略mybatis-flex-processor的依赖
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>
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> 参考:[APT 设置章节](../others/apt.md)
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Gradle示例:
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```groovy
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// file: build.gradle
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ext {
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mybatis_flex_version = '1.4.0'
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}
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dependencies {
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implementation("com.mybatis-flex:mybatis-flex-core:${mybatis_flex_version}")
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// 启用APT
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annotationProcessor("com.mybatis-flex:mybatis-flex-processor:${mybatis_flex_version}")
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}
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```
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**第 3 步:编写实体类和 Mapper**
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```java
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@Table("tb_account")
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public class Account {
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@Id(keyType = KeyType.Auto)
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private Long id;
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private String userName;
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private Integer age;
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private Date birthday;
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//getter setter
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}
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```
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- 使用 `@Table("tb_account")` 设置实体类与表名的映射关系
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- 使用 `@Id(keyType = KeyType.Auto)` 标识主键为自增
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Mapper 接口继承 BaseMapper 接口:
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```java
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public interface AccountMapper extends BaseMapper<Account> {
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}
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```
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> 这部分也可以使用 MyBatis-Flex 的代码生成器来生,功能非常强大的。详情进入:[代码生成器章节](../others/codegen.md) 了解。
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**第4步:编译项目,自动生成查询辅助类**
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MyBatis-Flex 使用了 APT(Annotation Processing Tool)技术,在项目编译的时,会自动生成辅助操作类。
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- Maven 编译: `mvn clean package`
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- Gradle 编译: `gradlew classes`
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更多信息请参考:[APT 设置章节](../others/apt.md)
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**第 5 步:通过 main 方法开始使用 MyBatis-Flex(无 Spring 的场景)**
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```java
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public class HelloWorld {
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public static void main(String... args) {
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//创建数据源
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HikariDataSource dataSource = new HikariDataSource();
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dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex");
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dataSource.setUsername("username");
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dataSource.setPassword("password");
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//配置数据源
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MybatisFlexBootstrap.getInstance()
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.setDataSource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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//获取 mapper
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AccountMapper mapper = MybatisFlexBootstrap.getInstance()
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.getMapper(AccountMapper.class);
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//示例1:查询 id=1 的数据
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Account account = mapper.selectOneById(1);
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//示例2:根据 QueryWrapper 查询 id >= 100 的数据列表
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QueryWrapper query = QueryWrapper.create()
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.where(ACCOUNT.ID.ge(100));
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List<Account> accounts = mapper.selectListByQuery(query);
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//示例3:者使用 Db + Row 查询
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String sql = "select * from tb_account where age > ?";
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List<Row> rows = Db.selectListBySql(sql, 18);
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}
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}
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```
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> 以上的示例中, `ACCOUNT` 为 MyBatis-Flex 通过 APT 自动生成,无需手动编码。更多查看 [APT 文档](../others/apt.md)。
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>
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>若觉得 APT 使用不习惯,
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> 也可以使用代码生成器来生成。点击 [代码生成器文档](../others/codegen.md) 了解。
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## 更多示例
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- 示例 1:[MyBatis-Flex 原生(非 Spring)](https://gitee.com/mybatis-flex/mybatis-flex-samples)
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- 示例 2:[MyBatis-Flex with Spring](https://gitee.com/mybatis-flex/mybatis-flex-samples)
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- 示例 3:[MyBatis-Flex with Spring boot](https://gitee.com/mybatis-flex/mybatis-flex-samples)
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- 示例 4:[Db + Row](https://gitee.com/mybatis-flex/mybatis-flex/blob/main/mybatis-flex-test/mybatis-flex-native-test/src/main/java/com/mybatisflex/test/DbTestStarter.java) |