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python的BumbleBee DB库

  • 2026-03-26 13:14:07
python的BumbleBee DB库

BumbleBee DB 是一个基于 Datalog 的高性能分析引擎,它同时也支持 SQL,特别适合处理递归查询和图分析这类在传统 SQL 中很麻烦的任务。它的核心引擎用 C++ 编写,支持列式存储和多线程,能够高效处理 CSV、Parquet 和 pandas DataFrame 数据。

快速上手

先安装,BumbleBee DB 为 Linux x86_64 和 macOS ARM 提供了预编译的 wheel 包:

pip install bumblebeedb

安装后,来看第一个 SQL 查询示例。这段代码从一个 CSV 文件中读取员工数据,按部门分组计算人数和薪资总和:

import bumblebeedb as bbdb = bb.db()# 用 SQL 查询 CSV 文件,alias 参数给结果命名db.sql("""    SELECT DEPARTMENT_ID, COUNT(*) AS CNT, SUM(SALARY) AS TOTAL    FROM "examples/data/employees.csv"    GROUP BY DEPARTMENT_ID""", alias="dept_stats")# 获取结果并转为 pandas DataFramedf = db.get_table("dept_stats"3).to_df(    col_names=["dept_id""count""total_salary"])print(df)

递归 Datalog 查询

这是 BumbleBee DB 最突出的能力。假设有一个员工上下级关系表,想找出所有人的所有层级下属,用 SQL 写递归查询会很复杂,但用 Datalog 就清晰多了:

import bumblebeedb as bbimport pandas as pd# 准备一份组织架构数据hierarchy = pd.DataFrame({    "manager": ["alice""alice""bob""bob""carol""dave"],    "report":  ["bob",   "carol""dave""eve""frank""grace"],})db = bb.db()# 把 DataFrame 加载为 predicate,predicate 名称必须小写开头db.load_df(hierarchy, "manages")# 递归 Datalog 规则# 第一条:直接下属# 第二条:间接下属(传递闭包)db.run("""    reports_to(M, R) :- manages(M, R).    reports_to(M, R) :- manages(M, X), reports_to(X, R).    reports_to(X, Y)?""")# 查看结果df = db.get_table("reports_to"2).to_df(col_names=["manager""report"])print("完整汇报关系:")print(df.sort_values(["manager""report"]).to_string(index=False))

输出会显示类似这样的结果:

manager  reportalice    bobalice    carolalice    davealice    evealice    frankalice    gracebob      davebob      evecarol    frankdave     grace

还可以把 Datalog 查询结果作为 SQL 的数据源继续分析:

# 在 Datalog 结果上跑 SQL,统计每个管理者的下属数量db.sql("""    SELECT COL_0, COUNT(*) AS CNT    FROM reports_to    GROUP BY COL_0""", alias="report_count")df2 = db.get_table("report_count"2).to_df(col_names=["manager""num_reports"])print("\n下属数量统计:")print(df2.sort_values("num_reports", ascending=False).to_string(index=False))

输出:

manager  num_reportsalice              6bob                2carol              1dave               1

从多种数据源加载

BumbleBee DB 可以从 CSV 和 Parquet 文件加载数据,也可以直接加载 pandas DataFrame,这意味着你可以先连接任何数据源(数据库、API、Excel 等),再交给 BumbleBee 处理:

# 从 CSV 文件加载db.run('''    employee(id, name, dept_id) :- load_csv("employees.csv").''')# 从 Parquet 文件加载db.run('''    sales(id, amount, region) :- load_parquet("sales.parquet").''')# 从 pandas DataFrame 加载import pandas as pddf = pd.read_sql("SELECT * FROM orders", your_db_connection)db.load_df(df, "orders")

Python API 常用操作

获取所有输出 predicate 列表:

# 列出当前所有的 predicate 及其元数predicates = db.get_output_predicates()for name, arity in predicates:    print(f"{name}/{arity}")

从结果表中获取数据的不同方式:

# 方式1:获取为 tuple 列表table = db.get_table("reports_to", 2)tuples = table.tuples()print(tuples)  # 类似于 [('alice', 'bob'), ('alice', 'carol'), ...]# 方式2:转为 DataFrame 并指定列名df = table.to_df(col_names=["manager""report"])

删除不再需要的 predicate:

db.remove_table("reports_to"2)

命令行工具

除了 Python API,BumbleBee 还提供了命令行工具,可以直接执行 SQL 或 Datalog 文件:

# 运行 SQL 文件BumbleBee -i examples/sql/01_import/basic_csv_import.sql# 运行 Datalog 文件,-a 参数打印所有 predicateBumbleBee -i examples/dl/01_import/basic_csv_import.dl -a# 指定线程数BumbleBee -i query.sql -t 4# 打印性能分析数据BumbleBee -i query.sql -r

性能特点

BumbleBee 采用列式存储和基于推送的执行模型,查询时只会读取需要的列,而不是整行数据。当前版本包含基于规则的优化器,支持谓词下推和列裁剪,但连接顺序遵循查询中的书写顺序——成本优化的连接重排功能在路线图中。预编译的 wheel 包针对 Linux 和 macOS ARM 优化,可以直接获得这些性能收益。

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  1. CONNECT:[ UseTime:0.001067s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001579s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000822s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000742s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001341s ]
  6. SELECT * FROM `set` [ RunTime:0.000654s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001490s ]
  8. SELECT * FROM `article` WHERE `id` = 482979 LIMIT 1 [ RunTime:0.001334s ]
  9. UPDATE `article` SET `lasttime` = 1774576129 WHERE `id` = 482979 [ RunTime:0.003696s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000759s ]
  11. SELECT * FROM `article` WHERE `id` < 482979 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001100s ]
  12. SELECT * FROM `article` WHERE `id` > 482979 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001203s ]
  13. SELECT * FROM `article` WHERE `id` < 482979 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003398s ]
  14. SELECT * FROM `article` WHERE `id` < 482979 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005982s ]
  15. SELECT * FROM `article` WHERE `id` < 482979 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.012099s ]
0.205954s