RapidQuery

RapidQuery: High-Performance SQL Query Builder for Python

RapidQuery is a powerful SQL query builder library designed for Python, combining the simplicity of Python with the raw speed of Rust. Build complex SQL queries effortlessly and efficiently, with a library that prioritizes both performance and ease of use.

Installation
Why RapidQuery?
Supported Backends
Usage
Performance
Known Issues
License

Install

You can use PIP:

pip3 install rapidquery

Or you can use UV (recommended):

uv add rapidquery

Why RapidQuery?

Features:

🧶 Thread safe: It's completely thread-safe and uses locks in internal to prevent concurrency problems.
⚡ Blazing High Performance: Leveraging the power of Rust under the hood, RapidQuery ensures your query building process is as fast as possible.
🛡️ SQL Injection Protection: Built-in security measures to prevent SQL injection attacks by default.
📝 Intuitive Pythonic API: Write clean, readable code with an API that feels natural to Python developers.
🔥 Built on Solid Foundations: RapidQuery is built with Rust and powered by the robust SeaQuery crate, bringing enterprise-grade reliability and performance to your Python applications.

Why RapidQuery Was Created
In a landscape filled with SQL libraries, we noticed a critical gap: performance was often an afterthought. That's why we built RapidQuery with speed as our primary and enduring focus.

Backends

RapidQuery supports PostgreSQL, MySQL, and SQLite. These are referred to as backends. When building SQL statements, you must specify your target backend.

Usage

Core Concepts
Query Statements
More About Queries
1. Custom Function
Schema Statements
Advanced Usage

Core Concepts

Value

Bridges Python types, Rust types, and SQL types for seamless data conversion.

This class handles validation, adaptation, and conversion between different type systems used in the application stack.

Note

this class is immutable and frozen.

Tip

Important: Value is lazy. This means it keeps your value and never converts it to Rust and then SQL until needed.

Expr

Represents a SQL expression that can be built into SQL code.

This class provides a fluent interface for constructing complex SQL expressions in a database-agnostic way. It supports arithmetic operations, comparisons, logical operations, and database-specific functions.

The class automatically handles SQL injection protection and proper quoting when building the final SQL statement.

Note

Expr is immutable, so by calling each method you will give a new instance of it which includes new change(s).

Basic

import rapidquery as rp

rp.Expr(25)                         # -> 25  (literal value)
rp.Expr("Hello")                    # -> 'Hello'  (literal value)
rp.Expr(rq.Value('World'))          # -> 'World'  (literal value)

rp.Expr.col("id")                             # -> "id" (column reference)
rp.Expr.col("users.name")                     # -> "users"."name" (column reference)
rp.Expr(rq.ColumnRef("name", table="users"))  # -> "users"."name" (column reference)

Comparisons

rq.Expr.col("status") == "active"  # -> "status" == 'active'
rq.Expr.col("age") > 16           # -> "age" > 16

# Note that `rq.all` is different from built-in `all`
rq.all(
    rq.Expr.col("age") >= 18,
    rq.Expr.col("subscription").is_null(), # same as rq.Expr.col("subscription").is_(Expr.null())
    rq.Expr.col("status").in_(["pending", "approved", "active"])
)    # -> "age" >= 18 AND "subscription" IS NULL AND "status" IN ('pending', 'approved', 'active')

# Note that `rq.any` is different from built-in `any`
rq.any(
    rq.Expr.col("is_admin").is_(True),
    rq.Expr.col("is_moderator").is_not_null(), # same as rq.Expr.col("subscription").is_not(Expr.null())
    rq.Expr.col("price").between(10.00, 50.00)
)    # -> "is_admin" IS TRUE OR "is_moderator" IS NOT NULL OR "price" BETWEEN 10.00 AND 50.00

Best Practices

Always use Expr.col() for column references: This ensures proper quoting for your target database

# Column reference (properly quoted identifier)
rq.Expr.col("user_name")  # → "user_name"

# String literal (value)
rq.Expr("user_name")      # → 'user_name'

Use rapidquery.all() and rapidquery.any() for logical combinations: More readable than chaining & and | operators

# Good
all(condition1, condition2, condition3)
   
# Less readable
condition1 & condition2 & condition3

Be careful with Expr.custom(): It bypasses all safety checks

# Dangerous - vulnerable to SQL injection
user_input = "'; DROP TABLE users; --"
Expr.custom(f"name = '{user_input}'")

# Safe
Expr.col("name") == user_input

Statement Builders

Statements are divided into 2 categories: QueryStatement, and SchemaStatement.

Some statements like Select, Update, Delete, Insert, ... are QueryStatement. Other statements like Table, AlterTable, Index, ... are SchemaStatement.

QueryStatement class interface is:

class QueryStatement:
    """Subclass of query statements."""

    def build(self, backend: _BackendName, /) -> tuple[str, tuple[Value, ...]]:
        """Build the SQL statement with parameter values."""
        ...

    def to_sql(self, backend: _BackendName, /) -> str:
        """
        Build a SQL string representation.

        **This method is unsafe and can cause SQL injection.** use `.build()` method instead.
        """
        ...

SchemaStatement class interface is:

class SchemaStatement:
    """Subclass of schema statements."""

    def to_sql(self, backend: _BackendName, /) -> str:
        """Build a SQL string representation."""
        ...

Query Select

Use rapidquery.SelectStatement type to generate SELECT statements.

import rapidquery as rq

stmt = (
    rq.SelectStatement()
    .columns("character", "fonts.name")
    .from_table("characters")
    .join("fonts", rq.Expr.col("characters.font_id") == rq.Expr.col("fonts.id"), "LEFT")
    .where(rq.Expr.col("size_w").in_([3, 4]))
    .where(rq.Expr.col("characters").like("A%"))
)
print(stmt.to_sql("postgres"))
# SELECT "character" AS "character", "fonts"."name" AS "name" FROM "characters"
# LEFT JOIN "fonts" ON "characters"."font_id" = "fonts"."id"
# WHERE "size_w" IN (3, 4) AND "characters" LIKE 'A%'

print(stmt.to_sql("mysql"))
# SELECT `character` AS `character`, `fonts`.`name` AS `name` FROM `characters`
# LEFT JOIN `fonts` ON `characters`.`font_id` = `fonts`.`id`
# WHERE `size_w` IN (3, 4) AND `characters` LIKE 'A%'

print(stmt.to_sql("sqlite"))
# SELECT "character" AS "character", "fonts"."name" AS "name" FROM "characters"
# LEFT JOIN "fonts" ON "characters"."font_id" = "fonts"."id" 
# WHERE "size_w" IN (3, 4) AND "characters" LIKE 'A%'

Query Insert

Use rapidquery.InsertStatement type to generate INSERT statements.

import rapidquery as rq

stmt = (
    rq.InsertStatement("glyph")
    .values(aspect=3.14, image="A4")
    .on_conflict(rq.OnConflict("id").do_update("image"))
)

print(stmt.to_sql("postgres"))
# INSERT INTO "glyph" ("aspect", "image") VALUES (3.14, 'A4')
# ON CONFLICT ("id") DO UPDATE SET "image" = "excluded"."image"
# 
print(stmt.to_sql("mysql"))
# INSERT INTO `glyph` (`aspect`, `image`) VALUES (3.14, 'A4')
# ON DUPLICATE KEY UPDATE `image` = VALUES(`image`)

print(stmt.to_sql("sqlite"))
# INSERT INTO "glyph" ("aspect", "image") VALUES (3.14, 'A4')
# ON CONFLICT ("id") DO UPDATE SET "image" = "excluded"."image"

Query Update

Use rapidquery.UpdateStatement type to generate UPDATE statements.

import rapidquery as rq

stmt = (
    rq.UpdateStatement("glyph")
    .values(aspect=1.23, image="123")
    .where(rq.Expr.col("id") == 1)
)

print(stmt.to_sql("postgres"))
# UPDATE "glyph" SET "aspect" = 1.23, "image" = '123' WHERE "id" = 1

print(stmt.to_sql("mysql"))
# UPDATE `glyph` SET `aspect` = 1.23, `image` = '123' WHERE `id` = 1

print(stmt.to_sql("sqlite"))
# UPDATE "glyph" SET "aspect" = 1.23, "image" = '123' WHERE "id" = 1

Query Delete

Use rapidquery.DeleteStatement type to generate DELETE statements.

import rapidquery as rq

stmt = rq.DeleteStatement("glyph").where(
    rq.any(
        rq.Expr.col("id") < 1,
        rq.Expr.col("id") > 10,
    )
)

print(stmt.to_sql("postgres"))
# DELETE FROM "glyph" WHERE "id" < 1 OR "id" > 10

print(stmt.to_sql("mysql"))
# DELETE FROM `glyph` WHERE `id` < 1 OR `id` > 10

print(stmt.to_sql("sqlite"))
# DELETE FROM "glyph" WHERE "id" < 1 OR "id" > 10

Query With

We have two types here: rapidquery.WithClause and rapidquery.WithQuery.

         WithQuery
             |
|------------------------|
WITH [... CTEs ...] QUERY
|------------------|
         |
     WithClause

As you can see, rapidquery.WithClause includes common table expressions (CTEs), and rapidquery.WithQuery includes rapidquery.WithClause and the final query.

import rapidquery as rq

clause = (
    rq.WithClause()
    .cte(
        "users_count",
        (
            rq.UpdateStatement("users")
            .values(amount=rq.Expr.col("amount") + 10)
            .where(rq.Expr.col("id") > 50)
            .returning(rq.Returning(rq.Expr.val(1)))
        ),
    )
    .cte(
        "teams_count",
        (
            rq.UpdateStatement("teams")
            .values(amount=rq.Expr.col("amount") + 10)
            .where(rq.Expr.col("id") > 50)
            .returning(rq.Returning(rq.Expr.val(1)))
        ),
    )
)

users_count_select = rq.SelectStatement(rq.Func.count(rq.Expr.asterisk())).from_table("users_count")
teams_count_select = rq.SelectStatement(rq.Func.count(rq.Expr.asterisk())).from_table("teams_count")

query: WithQuery = clause.query(
    rq.SelectStatement(
        users_count_select.label("users"),
        teams_count_select.label("teams"),
    )
)
query.to_sql("postgres")
# WITH 
#   "users_count" AS (
#       UPDATE "users" SET "amount" = "amount" + 10 WHERE "id" > 50 RETURNING 1
#   ) ,
#   "teams_count" AS (
#       UPDATE "teams" SET "amount" = "amount" + 10 WHERE "id" > 50 RETURNING 1
#   )
#   SELECT
#       (SELECT COUNT(*) FROM "users_count") AS "users",
#       (SELECT COUNT(*) FROM "teams_count") AS "teams"

Custom Functions

For working with functions in RapidQuery, you have to use Func class. A lot of functions such as SUM, AVG, MD5, ... is ready to use. For example:

stmt = rq.SelectStatement(rq.Func.sum(rq.Expr.col("amount")))
stmt.to_sql("postgres")
# SELECT SUM("amount")

But for functions not provided by the library, you can define custom functions. Custom functions can be defined using the Func constructor:

stmt = rq.SelectStatement(rq.Func("CUSTOM", 1, 'hello'))
stmt.to_sql("postgres")
# SELECT CUSTOM(1, 'hello')

Table Create

rapidquery.Table represents a complete database table definition. Use it to generate CREATE TABLE statements.

import rapidquery as rq

characters = rq.Table(
    "characters",
    rq.Column("id", rq.sqltypes.Integer(), primary_key=True, auto_increment=True),
    rq.Column("font_size", rq.sqltypes.Integer(), nullable=False),
    rq.Column("character", rq.sqltypes.String(), nullable=False),
    rq.Column("size_w", rq.sqltypes.Integer(), nullable=False),
    rq.Column("size_h", rq.sqltypes.Integer(), nullable=False),
    rq.Column("font_id", rq.sqltypes.Integer(), default=None),
    rq.ForeignKey(["font_id"], ["fonts.id"], on_delete="CASCADE", on_update="CASCADE"),
    rq.Index("idx_character", ["character"]),
    if_not_exists=True,
)

print(characters.to_sql("postgresql"))
# CREATE TABLE IF NOT EXISTS "characters" (
#   "id" serial PRIMARY KEY,
#   "font_size" integer NOT NULL,
#   "character" varchar NOT NULL,
#   "size_w" integer NOT NULL,
#   "size_h" integer NOT NULL,
#   "font_id" integer DEFAULT NULL,
#   FOREIGN KEY ("font_id") REFERENCES "fonts" ("id") ON DELETE CASCADE ON UPDATE CASCADE
# );
# CREATE INDEX IF NOT EXISTS "idx_character" ON "characters" ("character")

Table Alter

Use rapidquery.AlterTable type to generate ALTER TABLE statements.

import rapidquery as rq

stmt = rq.AlterTable(
    "fonts",
    [
        rq.AlterTableAddColumnOption(
            rq.Column(
                "new_col",
                rq.sqltypes.Integer(),
                nullable=False,
                default=100,
            )
        ),
        rq.AlterTableRenameColumnOption("hello", "world"),
    ],
)
print(stmt.to_sql("mysql"))
# ALTER TABLE `fonts` ADD COLUMN `new_col` int NOT NULL DEFAULT 100,
# RENAME COLUMN `hello` TO `world`

Table Drop

Use rapidquery.DropTable type to generate DROP TABLE statements.

import rapidquery as rq

stmt = rq.DropTable("glyph", if_exists=True)
print(stmt.to_sql("mysql"))
# DROP TABLE IF EXISTS `glyph`

Table Rename

Use rapidquery.RenameTable type to generate RENAME TABLE statements.

import rapidquery as rq

stmt = rq.RenameTable("old", "new")

print(stmt.to_sql("sqlite"))
# ALTER TABLE "old" RENAME TO "new"

print(stmt.to_sql("mysql"))
# RENAME TABLE `old` TO `new`

Table Truncate

Use rapidquery.TruncateTable type to generate TRUNCATE TABLE statements.

import rapidquery as rq

stmt = rq.TruncateTable("old")

print(stmt.to_sql("mysql"))
# TRUNCATE TABLE `old`

Index Create

import rapidquery as rq

idx = rq.Index("idx_glyph_aspect", ["aspect"], "glyph")

print(idx.to_sql("postgres"))
# CREATE INDEX "idx_glyph_aspect" ON "glyph" ("aspect")

Index Drop

Use rapidquery.DropIndex type to generate DROP INDEX statements.

import rapidquery as rq

idx = rq.DropIndex("idx_glyph_aspect", "glyph")

print(idx.to_sql("postgres"))
# DROP INDEX "idx_glyph_aspect"

More About Column Reference

Let's learn some tricks about column references.

In RapidQuery, we have something called ColumnRef, which represents a reference to a database column with optional table and schema qualification.

This type is a final type, which means you cannot use it as subclass.

In generating statements, we have a lot of situations that you need to work with column references.

❗ The Trick
For the parameters which accept column references, you have 4 ways:

Use ColumnRef:

col_ref = rq.ColumnRef("id", "characters")
# OR
col_ref = rq.ColumnRef.parse("characters.id")

stmt = rq.SelectStatement().columns(col_ref)
# SELECT "characters"."id" AS "id"

Use str: The easiest way

stmt = rq.SelectStatement().columns("characters.id")
# SELECT "characters"."id" AS "id"

Use __column_ref__ property: developer-friendly and expandable way.

class IdColumnProperty:
    @property
    def __column_ref__(self):
        # Can return ColumnRef or str
        return "characters.id"

class IdColumnClassVar:
    __column_ref__ = "characters.id"

stmt = rq.SelectStatement().columns(IdColumnProperty())
# SELECT "characters"."id" AS "id"

stmt = rq.SelectStatement().columns(IdColumnClassVar)
# SELECT "characters"."id" AS "id"

Use Column: It's possible because Column has __column_ref__ property.

id = Column("id", rq.Integer())

stmt = rq.SelectStatement().columns(id)
# SELECT "id" AS "id"

More About TableName

Let's learn some tricks about table name.

In RapidQuery, we have something called TableName, which represents a table name reference with optional schema, database, and alias.

This type is a final type, which means you cannot use it as subclass.

In generating statements, we have situations that you need to specify table name.

❗ The Trick
For the parameters which accept table name, you have 4 ways:

Use TableName:

tbl = rq.TableName("users", schema="archive")
# OR
tbl = rq.TableName.parse("archive.users")

stmt = rq.DeleteStatement(tbl)
# DELETE FROM "archive"."users"

Use str: The easiest way

stmt = rq.DeleteStatement("archive.users")
# DELETE FROM "archive"."users"

Use __table_name__ property: developer-friendly and expandable way.

class UsersProperty:
    @property
    def __table_name__(self):
        # Can return TableName or str
        return "archive.users"


class UsersClassVar:
    __table_name__ = "archive.users"


stmt = rq.DeleteStatement(UsersProperty())
# DELETE FROM "archive"."users"

stmt = rq.DeleteStatement(UsersClassVar)
# DELETE FROM "archive"."users"

Use Table: It's possible because Table has __table_name__ property.

users = Table(
    "archive.users",
    ...
)

stmt = rq.DeleteStatement(users)
# DELETE FROM "archive"."users"

More About Expr

You learned here about Expr type.

❗ The Trick
This 2 tricks are notable and very good to know.

First, like ColumnRef and TableName, Expr supports __expr__ property, which should always return Expr.

class TextClause:
    def __init__(self, expr: str) -> None:
        self.expr = expr

    @property
    def __expr__(self) -> rq.Expr:
        return rq.Expr.custom(self.expr)


stmt = rq.SelectStatement(TextClause("WOW!"))
# SELECT WOW!

Second, same as ColumnRef, Expr also supports __column_ref__ property.

Performance

Benchmarks

Benchmarks run on Linux 6.18.12-1-MANJARO x86_64 with CPython 3.14. Your results may vary.

Iterations per test: 100,000
Python version: 3.14.3

📊 SELECT Query Benchmark
----------------------------------------------------------------------
Library              Time (ms)       vs Fastest      Status
----------------------------------------------------------------------
RapidQuery               245.44     1.00x (FASTEST) 🏆
PyPika                  4327.18     17.63x slower
SQLAlchemy              8818.33     35.93x slower
----------------------------------------------------------------------

📊 INSERT Query Benchmark
----------------------------------------------------------------------
Library              Time (ms)       vs Fastest      Status
----------------------------------------------------------------------
RapidQuery               640.63     1.00x (FASTEST) 🏆
PyPika                  4655.51     7.27x slower
SQLAlchemy              7085.74     11.06x slower
----------------------------------------------------------------------

📊 UPDATE Query Benchmark
----------------------------------------------------------------------
Library              Time (ms)       vs Fastest      Status
----------------------------------------------------------------------
RapidQuery               557.21     1.00x (FASTEST) 🏆
PyPika                  4488.96     8.06x slower
SQLAlchemy             11839.85     21.25x slower
----------------------------------------------------------------------

📊 DELETE Query Benchmark
----------------------------------------------------------------------
Library              Time (ms)       vs Fastest      Status
----------------------------------------------------------------------
RapidQuery               441.38     1.00x (FASTEST) 🏆
PyPika                  4517.16     10.23x slower
SQLAlchemy              7924.52     17.95x slower
----------------------------------------------------------------------

Known Issues

Unmanaged Rust panic output in building SQL

The library may encounter errors during SQL query construction, which are correctly raised as RuntimeError exceptions. For instance, this occurs when using a function that isn't supported by your target database. While this error-raising behavior is intentional and logical, the issue is that unmanaged Rust panic information is also printed to stderr. Currently, there is no way to suppress or manage this panic output. We are working to resolve this problem as much as possible in future updates.

>>> import rapidquery as rq
>>> stmt = rq.TruncateTable("users")
>>> print(stmt.to_sql("sqlite"))

thread '<unnamed>' (14206) panicked at sea-query-0.32.7/src/backend/sqlite/table.rs:58:9:
Sqlite doesn't support TRUNCATE statement
Traceback (most recent call last):
  File "<python-input-3>", line 1, in <module>
    print(stmt.to_sql("sqlite"))
          ~~~~~~~~~~~^^^^^^^^^^
RuntimeError: build failed

Missing `init` Calls

If a RapidQuery object is instantiated without calling its __init__ method (e.g., via certain serialization tricks or __new__ alone), the internal Rust pointer will be null. Accessing methods on such objects will cause an unmanaged Rust panic. Always use the provided constructors.

Join conditions are not optional

Currently, JOIN operations require an explicit ON or USING condition.

TODO

License

This repository is licensed under the GNU GPLv3 License

Name		Name	Last commit message	Last commit date
Latest commit History 143 Commits
.github/workflows		.github/workflows
rapidquery		rapidquery
src		src
tests		tests
.gitignore		.gitignore
Cargo.lock		Cargo.lock
Cargo.toml		Cargo.toml
LICENSE		LICENSE
README.md		README.md
benchmarks.py		benchmarks.py
develop.sh		develop.sh
pyproject.toml		pyproject.toml
rustfmt.toml		rustfmt.toml
uv.lock		uv.lock

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RapidQuery

Install

Why RapidQuery?

Backends

Usage

Core Concepts

Value

Expr

Statement Builders

Query Select

Query Insert

Query Update

Query Delete

Query With

Custom Functions

Table Create

Table Alter

Table Drop

Table Rename

Table Truncate

Index Create

Index Drop

More About Column Reference

More About TableName

More About Expr

Performance

Benchmarks

Known Issues

Unmanaged Rust panic output in building SQL

Missing __init__ Calls

Join conditions are not optional

TODO

License

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