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143 lines
4.2 KiB
Markdown
143 lines
4.2 KiB
Markdown
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# Mybatis-Flex 一个优雅的 Mybatis 增强框架
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## 特征
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- 1、很轻量，整个框架只依赖 Mybatis 再无其他任何第三方依赖
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- 2、Entity 类基本的增删改查、分页查询
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- 3、Row 通用映射支持，可以无需实体类对数据库进行增删改查
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- 4、支持多种数据库类型，自由通过方言持续扩展
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- 5、支持联合主键，以及不同的主键下的主键内容生成策略
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- 6、极其友好的 SQL 联动查询，IDE 自动提示不再担心出错
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- 7、以及更多小惊喜
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## hello world
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**实体类**
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```java
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@Table("tb_account")
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public class Account {
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@Id()
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private Long id;
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private String userName;
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private Date birthday;
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private int sex;
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//getter setter
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}
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```
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**AccountMapper 类**
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```java
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public interface AccountMapper extends BaseMapper<Account> {
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//只需定义 Mapper 接口即可，可以无任何内容。
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}
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```
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**Hello world**
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示例 1：查询 1 条数据
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```java
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class HelloWorld {
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public static void main(String... args) {
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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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MybatisFlexBootstrap.getInstance()
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.setDatasource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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//示例1：查询 id=100 条数据
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Account account = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.selectOneById(100)
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);
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}
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}
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```
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示例2：查询列表
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```java
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class HelloWorld {
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public static void main(String... args) {
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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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MybatisFlexBootstrap.getInstance()
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.setDatasource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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//示例2：通过 QueryWrapper 构建条件查询数据列表
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")));
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// 执行 SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' )
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List<Account> accounts = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.selectListByQuery(query)
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);
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}
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}
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```
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示例3：分页查询
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```java
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class HelloWorld {
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public static void main(String... args) {
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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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MybatisFlexBootstrap.getInstance()
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.setDatasource(dataSource)
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.addMapper(AccountMapper.class)
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.start();
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// 示例3：分页查询
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// 查询第 5 页，每页 10 条数据，通过 QueryWrapper 构建条件查询
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QueryWrapper query = QueryWrapper.create()
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.select()
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.from(ACCOUNT)
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.where(ACCOUNT.ID.ge(100))
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.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")))
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.orderBy(ACCOUNT.ID.desc());
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// 执行 SQL：
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// ELECT * FROM `tb_account`
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// WHERE `tb_account`.`id` >= 100
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// AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' )
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// ORDER BY `tb_account`.`id` DESC
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// LIMIT 40,10
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Page<Account> accounts = MybatisFlexBootstrap.getInstance()
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.execute(AccountMapper.class, mapper ->
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mapper.paginate(5, 10, query)
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);
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}
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}
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```
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