本期推荐的 BeetlSQL的目标是提供开发高效，维护高效，运行高效的数据库访问框架，在一个系统多个库的情况下，提供一致的编写代码方式。

项目介绍

• 传统数据库：MySQL(国内兼容MySQL协议的各种大数据库),MariaDB,Oralce,Postgres,DB2,SQL Server，H2,SQLite,Derby，神通，达梦，华为高斯，人大金仓，PolarDB等
• 大数据：HBase，ClickHouse，Cassandar，Hive
• 物联网时序数据库：Machbase，TD-Engine，IotDB
• SQL查询引擎:Drill,Presto，Druid
• 内存数据库:ignite，CouchBase

BeetlSQL 不仅仅是简单的类似MyBatis或者是Hibernate，或者是俩着的综合，BeetlSQL远大理想是对标甚至超越Spring Data，是实现数据访问统一的框架，无论是传统数据库，还是大数据，还是查询引擎或者时序库，内存数据库。

BeetlSQL的架构

BeetlSQL依赖

<dependency>
    <groupId>com.ibeetl</groupId>
    <artifactId>beetlsql</artifactId>
    <version>3.${version}</version>
</dependency>

旧版本依赖

<dependency>
    <groupId>com.ibeetl</groupId>
    <artifactId>beetlsql</artifactId>
    <version>2.13.3.RELEASE</version>
</dependency>

代码示例

例子1,内置方法，无需写SQL完成常用操作

UserEntity user  = sqlManager.unique(UserEntity.class,1);

user.setName("ok123");
sqlManager.updateById(user);

UserEntity newUser = new UserEntity();
newUser.setName("newUser");
newUser.setDepartmentId(1);
sqlManager.insert(newUser);

例子2 使用SQL

String sql = "select * from user where id=?";
Integer id  = 1;
SQLReady sqlReady = new SQLReady(sql,new Object[id]);
List<UserEntity> userEntities = sqlManager.execute(sqlReady,UserEntity.class);
//Map 也可以作为输入输出参数
List<Map> listMap =  sqlManager.execute(sqlReady,Map.class);

例子3 使用模板SQL

String sql = "select * from user where department_id=#{id} and name=#{name}";
UserEntity paras = new UserEntity();
paras.setDepartmentId(1);
paras.setName("lijz");
List<UserEntity> list = sqlManager.execute(sql,UserEntity.class,paras);

String sql = "select * from user where id in ( #{join(ids)} )";
List list = Arrays.asList(1,2,3,4,5); Map paras = new HashMap();
paras.put("ids", list);
List<UserEntity> users = sqlManager.execute(sql, UserEntity.class, paras);

例子4 使用Query类

LambdaQuery<UserEntity> query = sqlManager.lambdaQuery(UserEntity.class);
List<UserEntity> entities = query.andEq(UserEntity::getDepartmentId,1)
                    .andIsNotNull(UserEntity::getName).select();

例子6 复杂映射支持

• 自动映射

@Data
@ResultProvider(AutoJsonMapper.class)
 public static class MyUserView {
        Integer id;
        String name;
        DepartmentEntity dept;
 }

• 配置映射，比MyBatis更容易理解，报错信息更详细

{
	"id": "id",
	"name": "name",
	"dept": {
		"id": "dept_id",
		"name": "dept_name"
	},
	"roles": {
		"id": "r_id",
		"name": "r_name"
	}
}

例子7 最好使用mapper来作为数据库访问类

@SqlResource("user") /*sql文件在user.md里*/
public interface UserMapper extends BaseMapper<UserEntity> {

    @Sql("select * from user where id = ?")
    UserEntity queryUserById(Integer id);

    @Sql("update user set name=? where id = ?")
    @Update
    int updateName(String name,Integer id);

    @Template("select * from user where id = #{id}")
    UserEntity getUserById(Integer id);

    @SpringData/*Spring Data风格*/
    List<UserEntity> queryByNameOrderById(String name);

    /**
     * 可以定义一个default接口
     * @return
     */
     default  List<DepartmentEntity> findAllDepartment(){
        Map paras = new HashMap();
        paras.put("exlcudeId",1);
        List<DepartmentEntity> list = getSQLManager().execute("select * from department where id != #{exlcudeId}",DepartmentEntity.class,paras);
        return list;
    }


    /**
     * 调用sql文件user.md#select,方法名即markdown片段名字
     * @param name
     * @return
     */
     List<UserEntity> select(String name);


    /**
     * 翻页查询,调用user.md#pageQuery
     * @param deptId
     * @param pageRequest
     * @return
     */
    PageResult<UserEntity>  pageQuery(Integer deptId, PageRequest pageRequest);
	
    @SqlProvider(provider= S01MapperSelectSample.SelectUserProvider.class)
    List<UserEntity> queryUserByCondition(String name);

    @SqlTemplateProvider(provider= S01MapperSelectSample.SelectUs
    List<UserEntity> queryUserByTemplateCondition(String name);

    @Matcher /*自己定义个Matcher注解也很容易*/
    List<UserEntity> query(Condition condition,String name);
}

例子11 代码生成框架

可以使用内置的代码生成框架生成代码何文档，也可以自定义的，用户可自行扩展SourceBuilder类

	List<SourceBuilder> sourceBuilder = new ArrayList<>();
	SourceBuilder entityBuilder = new EntitySourceBuilder();
	SourceBuilder mapperBuilder = new MapperSourceBuilder();
	SourceBuilder mdBuilder = new MDSourceBuilder();
	//数据库markdown文档
	SourceBuilder docBuilder = new MDDocBuilder();

	sourceBuilder.add(entityBuilder);
	sourceBuilder.add(mapperBuilder);
	sourceBuilder.add(mdBuilder);
	sourceBuilder.add(docBuilder);
    SourceConfig config = new SourceConfig(sqlManager,sourceBuilder);
   //只输出到控制台
	ConsoleOnlyProject project = new ConsoleOnlyProject();
	String tableName = "USER";
	config.gen(tableName,project);