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Apr 7, 2025
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add missing imports to readme #181

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12 changes: 8 additions & 4 deletions README.md
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Expand Up @@ -35,18 +35,22 @@ pip install -U langchain-postgres
For a detailed example on `PGVectorStore` see [here](https://github.com/langchain-ai/langchain-postgres/blob/main/examples/pg_vectorstore.ipynb).

```python
from langchain_postgres import PGEngine, PGVectorStore
from langchain_core.documents import Document
from langchain_core.embeddings import DeterministicFakeEmbedding
import uuid
from langchain_postgres import PGEngine, PGVectorStore

# Replace these variable values
# Replace the connection string with your own Postgres connection string
CONNECTION_STRING = "postgresql+psycopg3://langchain:langchain@localhost:6024/langchain"
engine = PGEngine.from_connection_string(url=CONNECTION_STRING)

# Replace the vector size with your own vector size
VECTOR_SIZE = 768
embedding = DeterministicFakeEmbedding(size=VECTOR_SIZE)

TABLE_NAME = "my_doc_collection"

engine.init_vectorstore_table(
table_name="destination_table",
table_name=TABLE_NAME,
vector_size=VECTOR_SIZE,
)

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