TxtToPG: Convert Plain Text to PostgreSQL Schema Fast

TxtToPG: Convert Plain Text to PostgreSQL Schema Fast

What it is

TxtToPG is a tool/workflow that automatically converts plain text data files (CSV, TSV, fixed-width, or other delimited TXT files) into a ready-to-use PostgreSQL schema and imports the data.

Key features

• Automatic schema inference: Detects column names, types (integer, float, boolean, date/time, text), and appropriate NULLability.
• Delimiter support: Works with commas, tabs, pipes, semicolons, or custom delimiters.
• Data cleaning: Handles trimming, quoting, escaped characters, and common malformed rows.
• Index and key suggestions: Suggests primary keys and indexes based on uniqueness checks and column usage.
• Batch import: Generates COPY commands or bulk INSERTs optimized for PostgreSQL performance.
• Preview mode: Shows inferred schema and sample rows before applying changes.
• CLI and scriptable outputs: Produces SQL DDL and import scripts you can run or integrate into pipelines.

Typical workflow (steps)

1. Provide the text file and specify delimiter (or let TxtToPG auto-detect).
2. Tool scans a representative sample (default: first 10k–100k rows).
3. TxtToPG infers column names and data types, flags ambiguous columns.
4. Review preview; adjust types, set primary key or indexes if needed.
5. Generate DDL and optimized COPY/import commands.
6. Execute generated SQL against your Postgres instance (optionally within a transaction).
7. Validate row counts and run optional post-import normalization steps.

Recommendations for best results

• Supply a representative sample that includes edge cases (empty values, outliers, different date formats).
• Explicitly specify column names if the source lacks a header row.
• For large files, use COPY with a staging table and disable autovacuum/indexing during bulk load if safe.
• Normalize dates and numeric formats before import when possible.
• Add constraints (NOT NULL, CHECK) only after validating the dataset to avoid import failures.

Example generated SQL (conceptual)

sql
Copy CodeCopied
CREATE TABLE users_tmp (
id BIGINT,
  name TEXT,
  email TEXT,
  signup_date TIMESTAMP,
  active BOOLEAN
);
COPY users_tmp (id,name,email,signup_date,active)
FROM ’/path/to/file.csv’ WITH (FORMAT csv, DELIMITER ’,’, HEADER true, NULL “);
– Optional: move to final table with constraints and indexes

When to use TxtToPG

• Migrating legacy exports or logs into PostgreSQL.
• Setting up analytics warehouses from exported text datasets.
• Rapid prototyping of DB schemas from sample data.
• Automating ETL where source is flat files.

If you want, I can:

• Generate a sample TxtToPG command and SQL using a small example file you provide, or
• Produce a short CLI tutorial showing exact commands for CSV→Postgres import.