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DuckDB

DuckDB是一个内部SQL OLAP数据库管理系统。 使用每行一个文档的方式加载DuckDB查询。

#!pip install duckdb
from langchain.document_loaders import DuckDBLoader
%%file example.csv
Team,Payroll
Nationals,81.34
Reds,82.20
写 example.csv
loader = DuckDBLoader("SELECT * FROM read_csv_auto('example.csv')")
data = loader.load()
print(data)
[Document(page_content='Team: Nationals\nPayroll: 81.34', metadata={}), Document(page_content='Team: Reds\nPayroll: 82.2', metadata={})]

指定哪些列为内容列，哪些列为元数据列​

loader = DuckDBLoader(
    "SELECT * FROM read_csv_auto('example.csv')",
    page_content_columns=["Team"],
    metadata_columns=["Payroll"],
)
data = loader.load()
print(data)
[Document(page_content='Team: Nationals', metadata={'Payroll': 81.34}), Document(page_content='Team: Reds', metadata={'Payroll': 82.2})]

将源添加到数据​

loader = DuckDBLoader(
    "SELECT Team, Payroll, Team As source FROM read_csv_auto('example.csv')",
    metadata_columns=["source"],
)
data = loader.load()
print(data)
[Document(page_content='Team: Nationals\nPayroll: 81.34\nsource: Nationals', metadata={'source': 'Nationals'}), Document(page_content='Team: Reds\nPayroll: 82.2\nsource: Reds', metadata={'source': 'Reds'})]