sqlgen/docs

sqlgen Documentation

Welcome to the sqlgen documentation. This guide provides detailed information about sqlgen's features and APIs.

Core Concepts

• Defining Tables - How to define tables using C++ structs
• sqlgen::col - How to represent columns in queries
• sqlgen::literals - How to use column and table alias literals in queries
• sqlgen::Flatten - How to "inherit" fields from other structs
• sqlgen::PrimaryKey - How to define primary keys in sqlgen
• sqlgen::Result - How sqlgen handles errors and results
• sqlgen::to_sql - How to transpile C++ operations to dialect-specific SQL

Database I/O

• sqlgen::read - How to read data from a database
• sqlgen::write - How to write data to a database

Database Operations

• sqlgen::create_as - How to create tables and views from SELECT queries
• sqlgen::create_index - How to create an index on a table
• sqlgen::create_table - How to create a new table
• sqlgen::delete_from - How to delete data from a table
• sqlgen::drop - How to drop a table
• sqlgen::exec - How to execute raw SQL statements
• sqlgen::group_by and Aggregations - How generate GROUP BY queries and aggregate data
• sqlgen::inner_join, sqlgen::left_join, sqlgen::right_join, sqlgen::full_join - How to join different tables
• sqlgen::insert - How to insert data within transactions
• sqlgen::select_from - How to read data from a database using more complex queries
• sqlgen::unite and sqlgen::unite_all - How to combine results from multiple SELECT statements
• sqlgen::update - How to update data in a table

Other Operations

• Cache - How to improve performance with caching.
• Mathematical Operations - How to use mathematical functions in queries (e.g., abs, ceil, floor, exp, trigonometric functions, round).
• String Operations - How to manipulate and transform strings in queries (e.g., length, lower, upper, trim, replace, concat).
• Type Conversion Operations - How to convert between types safely in queries (e.g., cast int to double).
• Null Handling Operations - How to handle nullable values and propagate nullability correctly (e.g., with coalesce and nullability rules).
• Timestamp and Date/Time Functions - How to work with timestamps, dates, and times (e.g., extract parts, perform arithmetic, convert formats).
• Enums - How to work with enums sqlgen

Data Types and Validation

• sqlgen::Dynamic - How to define custom SQL types not natively supported by sqlgen
• sqlgen::ForeignKey - How to establish referential integrity between tables
• sqlgen::JSON - How to store and work with JSON fields
• sqlgen::Pattern - How to add regex pattern validation to avoid SQL injection
• sqlgen::Timestamp - How timestamps work in sqlgen
• sqlgen::Unique - How to enforce uniqueness constraints on table columns
• sqlgen::Varchar - How varchars work in sqlgen

Other concepts

• Connection Pool - How to manage database connections efficiently
• Transactions - How to use transactions for atomic operations
• Views - How to create and manage database views

Supported Databases

• DuckDB - How to interact with DuckDB
• MySQL - How to interact with MariaDB and MySQL
• PostgreSQL - How to interact with PostgreSQL and compatible databases (Redshift, Aurora, Greenplum, CockroachDB, ...)
• SQLite - How to interact with SQLite3

For installation instructions, quick start guide, and usage examples, please refer to the main README.