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开源海哥 2023-03-03 11:09:49 +08:00
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@ -80,76 +80,44 @@ class HelloWorld {
示例2：查询列表
```java
class HelloWorld {
public static void main(String... args) {
//示例2：通过 QueryWrapper 构建条件查询数据列表
QueryWrapper query = QueryWrapper.create()
.select()
.from(ACCOUNT)
.where(ACCOUNT.ID.ge(100))
.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")));
HikariDataSource dataSource = new HikariDataSource();
dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex");
dataSource.setUsername("username");
dataSource.setPassword("password");
MybatisFlexBootstrap.getInstance()
.setDatasource(dataSource)
.addMapper(AccountMapper.class)
.start();
//示例2：通过 QueryWrapper 构建条件查询数据列表
QueryWrapper query = QueryWrapper.create()
.select()
.from(ACCOUNT)
.where(ACCOUNT.ID.ge(100))
.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")));
// 执行 SQL：
// ELECT * FROM `tb_account`
// WHERE `tb_account`.`id` >= 100
// AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' )
List<Account> accounts = MybatisFlexBootstrap.getInstance()
.execute(AccountMapper.class, mapper ->
mapper.selectListByQuery(query)
);
}
}
// 执行 SQL：
// ELECT * FROM `tb_account`
// WHERE `tb_account`.`id` >= 100
// AND (`tb_account`.`user_name` LIKE '%张%' OR `tb_account`.`user_name` LIKE '%李%' )
List<Account> accounts = MybatisFlexBootstrap.getInstance()
.execute(AccountMapper.class, mapper ->
mapper.selectListByQuery(query)
);
```
示例3：分页查询
```java
class HelloWorld {
public static void main(String... args) {
// 示例3：分页查询
// 查询第 5 页，每页 10 条数据，通过 QueryWrapper 构建条件查询
QueryWrapper query = QueryWrapper.create()
.select()
.from(ACCOUNT)
.where(ACCOUNT.ID.ge(100))
.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")))
.orderBy(ACCOUNT.ID.desc());
HikariDataSource dataSource = new HikariDataSource();
dataSource.setJdbcUrl("jdbc:mysql://127.0.0.1:3306/mybatis-flex");
dataSource.setUsername("username");
dataSource.setPassword("password");
MybatisFlexBootstrap.getInstance()
.setDatasource(dataSource)
.addMapper(AccountMapper.class)
.start();
// 示例3：分页查询
// 查询第 5 页，每页 10 条数据，通过 QueryWrapper 构建条件查询
QueryWrapper query = QueryWrapper.create()
.select()
.from(ACCOUNT)
.where(ACCOUNT.ID.ge(100))
.and(ACCOUNT.USER_NAME.like("张").or(ACCOUNT.USER_NAME.like("李")))
.orderBy(ACCOUNT.ID.desc());
// 执行 SQL：
// ELECT * FROM `tb_account`
// WHERE `id` >= 100
// AND (`user_name` LIKE '%张%' OR `user_name` LIKE '%李%' )
// ORDER BY `id` DESC
// LIMIT 40,10
Page<Account> accounts = MybatisFlexBootstrap.getInstance()
.execute(AccountMapper.class, mapper ->
mapper.paginate(5, 10, query)
);
}
}
// 执行 SQL：
// ELECT * FROM `tb_account`
// WHERE `id` >= 100
// AND (`user_name` LIKE '%张%' OR `user_name` LIKE '%李%' )
// ORDER BY `id` DESC
// LIMIT 40,10
Page<Account> accounts = MybatisFlexBootstrap.getInstance()
.execute(AccountMapper.class, mapper ->
mapper.paginate(5, 10, query)
);
```
## QueryWrapper 示例
@ -388,16 +356,12 @@ Mybatis-Flex 多主键就是在 Entity 类里有多个 `@Id` 注解标识而已
@Table("tb_account")
public class Account {
@Id((keyType=KeyType.Auto)
@Id(keyType=KeyType.Auto)
private Long id;
@Id(keyType=KeyType.Generator, value="uuid")
private String otherId;
private String userName;
private Date birthday;
private int sex;
//getter setter
}
```
@ -418,11 +382,13 @@ public class UUIDKeyGenerator implements IKeyGenerator {
```
第 2 步：注册 UUIDKeyGenerator
```java
KeyGeneratorFactory.register("myUUID",new UUIDKeyGenerator());
```
第 3 步：在 Entity 里使用 "myUUID" 生成器：
```java
@Table("tb_account")
public class Account {
@ -440,7 +406,7 @@ public class Account {
@Table("tb_account")
public class Account {
@Id((keyType=KeyType.Sequence, value="select SEQ_USER_ID.nextval as id from dual")
@Id(keyType=KeyType.Sequence, value="select SEQ_USER_ID.nextval as id from dual")
private Long id;
}