A Python SDK for database search operations with vector and full-text search capabilities
Project description
Holo Search SDK
一个用于Hologres数据库搜索操作的 Python SDK,支持向量搜索和全文搜索功能。
✨ 特性
- 🔍 向量搜索: 基于语义相似性的搜索功能
- 📝 全文搜索: 传统的基于关键词的搜索
- 🛡️ 类型安全: 使用类型提示和数据验证
- 🧩 模块化设计: 清晰的分层架构,便于扩展和维护
📦 安装
从 PyPI 安装
pip install holo-search-sdk
🚀 快速开始
基本使用
import holo_search_sdk as holo
# 连接到数据库
client = holo.connect(
host="your-host",
port=80,
database="your-database",
access_key_id="your-access-key-id",
access_key_secret="your-access-key-secret",
schema="public"
)
# 建立连接
client.connect()
# 打开表
columns = {
"id": ("INTEGER", "PRIMARY KEY"),
"content": "TEXT",
"vector": "FLOAT8[]",
"metadata": "JSONB"
}
table = client.open_table("table_name")
# 插入数据
data = [
[1, "Hello world", [0.1, 0.2, 0.3], {"category": "greeting"}],
[2, "Python SDK", [0.4, 0.5, 0.6], {"category": "tech"}],
[3, "Vector search", [0.7, 0.8, 0.9], {"category": "search"}]
]
table.insert_multi(data, ["id", "content", "vector", "metadata"])
# 设置向量索引
table.set_vector_index(
column="vector",
distance_method="Cosine",
base_quantization_type="rabitq",
max_degree=64,
ef_construction=400
)
# 向量搜索
query_vector = [0.1, 0.2, 0.3]
results = table.search_vector(query_vector, "vector").limit(10).fetchall()
# 关闭连接
client.disconnect()
使用上下文管理器
import holo_search_sdk as holo
with holo.connect(
host="your-host",
port=80,
database="your-database",
access_key_id="your-access-key-id",
access_key_secret="your-access-key-secret"
) as client:
client.connect()
# 执行数据库操作
table = client.open_table("table_name")
results = table.search_vector([0.1, 0.2, 0.3], "vector_column").fetchall()
# 连接会自动关闭
📚 详细文档
核心概念
1. 客户端 (Client)
客户端是与数据库交互的主要接口:
from holo_search_sdk import connect
# 创建客户端
client = connect(
host="localhost",
port=80,
database="test_db",
access_key_id="your_key",
access_key_secret="your_secret"
)
# 建立连接
client.connect()
# 执行 SQL
result = client.execute("SELECT COUNT(*) FROM users", fetch_result=True)
# 表操作
table = client.open_table("table_name")
2. 表操作 (Table Operations)
表是数据存储和搜索的基本单位:
# 打开现有表
table = client.open_table("table_name")
# 检查表是否存在
exists = client.check_table_exist("table_name")
# 删除表
client.drop_table("table_name")
3. 数据插入
支持单条和批量数据插入:
# 插入单条记录
table.insert_one(
[1, "标题", "内容", [0.1, 0.2, 0.3]],
["id", "title", "content", "vector"]
)
# 批量插入
data = [
[1, "文档1", "内容1", [0.1, 0.2, 0.3]],
[2, "文档2", "内容2", [0.4, 0.5, 0.6]],
[3, "文档3", "内容3", [0.7, 0.8, 0.9]]
]
table.insert_multi(data, ["id", "title", "content", "vector"])
4. 向量索引
为向量列创建高效的搜索索引:
# 设置单个向量索引
table.set_vector_index(
column="vector",
distance_method="Cosine", # 可选: "Euclidean", "InnerProduct", "Cosine"
base_quantization_type="rabitq", # 可选: "sq8", "sq8_uniform", "fp16", "fp32", "rabitq"
max_degree=64,
ef_construction=400,
use_reorder=True,
precise_quantization_type="fp32",
max_total_size_to_merge_mb=4096, # 磁盘合并时数据的最大文件大小,单位MB
build_thread_count=16 # 索引构建过程中使用的线程数
)
# 设置多个向量索引
table.set_vector_indexes({
"content_vector": {
"distance_method": "Cosine",
"base_quantization_type": "rabitq",
"max_degree": 64,
"ef_construction": 400,
"use_reorder": True,
"precise_quantization_type": "fp32",
"max_total_size_to_merge_mb": 4096,
"build_thread_count": 16
},
"title_vector": {
"distance_method": "Euclidean",
"base_quantization_type": "rabitq",
"max_degree": 32,
"ef_construction": 200,
"use_reorder": True,
"precise_quantization_type": "fp32",
"max_total_size_to_merge_mb": 4096,
"build_thread_count": 16
}
})
# 删除所有向量索引
table.delete_vector_indexes()
5. 向量搜索
执行语义相似性搜索:
# 基本向量搜索
query_vector = [0.1, 0.2, 0.3]
results = table.search_vector(
vector=query_vector,
column="vector",
distance_method="Cosine"
).fetchall()
# 带输出别名的搜索
results = table.search_vector(
vector=query_vector,
column="vector",
output_name="similarity_score",
distance_method="Cosine"
).fetchall()
6. 数据查询
支持基于主键的精确查询:
# 根据主键查询单条记录
result = table.get_by_key(
key_column="id",
key_value=1,
return_columns=["id", "content", "vector"] # 可选,不指定则返回所有列
).fetchone()
# 根据主键列表批量查询
results = table.get_multi_by_keys(
key_column="id",
key_values=[1, 2, 3],
return_columns=["id", "content"] # 可选,不指定则返回所有列
).fetchall()
7. 向量索引管理
查询和管理向量索引信息:
# 获取向量索引信息
index_info = table.get_vector_index_info()
if index_info:
print("当前向量索引配置:", index_info)
else:
print("未找到向量索引配置")
# 索引信息示例返回格式
# {
# "vector_column": {
# "algorithm": "HGraph",
# "distance_method": "Cosine",
# "builder_params": {
# "max_degree": 64,
# "ef_construction": 400,
# "base_quantization_type": "rabitq",
# "use_reorder": true,
# "precise_quantization_type": "fp32",
# "precise_io_type": "block_memory_io",
# "max_total_size_to_merge_mb": 4096,
# "build_thread_count": 16
# }
# }
# }
配置选项
连接配置
from holo_search_sdk.types import ConnectionConfig
config = ConnectionConfig(
host="your-host.com",
port=80,
database="production_db",
access_key_id="user...",
access_key_secret="secret...",
schema="analytics" # 默认为 "public"
)
向量索引配置
-
distance_method: 距离计算方法
"Euclidean": 欧几里得距离"InnerProduct": 内积距离"Cosine": 余弦距离
-
base_quantization_type: 基础量化类型
"sq8","sq8_uniform","fp16","fp32","rabitq"
-
max_degree: 图构建过程中每个顶点尝试连接的最近邻数量 (默认: 64)
-
ef_construction: 图构建过程中的搜索深度控制 (默认: 400)
-
use_reorder: 是否使用 HGraph 高精度索引 (默认: False)
-
precise_quantization_type: 精确量化类型 (默认: "fp32")
-
precise_io_type: 精确 IO 类型 (默认: "block_memory_io")
-
max_total_size_to_merge_mb: 磁盘合并时数据的最大文件大小,单位MB (默认: 4096)
-
build_thread_count: 索引构建过程中使用的线程数 (默认: 16)
🔧 API 参考
主要类
Client: 数据库客户端,管理连接和表操作HoloTable: 表操作接口,支持数据插入和向量搜索ConnectionConfig: 连接配置数据类
主要函数
connect(): 创建数据库客户端连接open_table(): 打开现有表insert_one(): 插入单条记录insert_multi(): 批量插入记录set_vector_index(): 设置向量索引search_vector(): 执行向量搜索
异常类
HoloSearchError: 基础异常类ConnectionError: 连接相关错误QueryError: 查询执行错误SqlError: SQL 生成错误TableError: 表操作错误
📄 许可证
本项目采用 MIT 许可证 - 查看 LICENSE.txt 文件了解详情。
Holo Search SDK - 让Hologres向量和全文搜索变得简单高效 🚀
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