sqlgen generates SQL statements and database helper functions from your Go structs. It can be used in place of a simple ORM or hand-written SQL.

See the [demo](https:// github.com/divyesh19/sqlgen2/tree/master/demo) directory for examples. Look in the generated files *_sql.go and the hand-crafted files (hook.go, issue.go, user.go).

Features

• Auto-generates DAO-style table-support code for SQL databases.
• Sophisticated parsing of a Go struct that describes records in the table.
• Allows nesting of structs, fields that are structs or pointers to structs etc.
• Struct tags give fine control over the semantics of each field.
• Supports indexes and constraints.
• Supports foreign key relationships between tables.
• Helps you develop code for joins and views.
• Supports JSON-encoded columns, allowing a more no-SQL model when needed.
• Provides a builder-style API for constructing where-clauses and query constraints.
• Allows declarative requirements on the expected result of each query, enhancing error checking.
• Very flexible configuration.
• Fast and easy to use.

Currently, support is included for MySQL, PostgreSQL and SQLite. Other dialects can be added relatively easy - send a Pull Request!

Install

Install or upgrade with this command:

go get -u 
github.com/divyesh19/sqlgen2/sqlgen

This will fetch the source code, compile it, and leave a sqlgen binary in your bin folder ready to use.

You will also need to import the sqlgen2 package and other sub-packages in your source code.

Usage

See the command line usage.

Tutorial

See the tutorial.

Benchmarks

This tool demonstrates performance gains, albeit small, over light-weight ORM packages such as sqlx and meddler. Over time I plan to expand the benchmarks to include additional ORM packages.

To run the project benchmarks:

go get ./...
go generate ./...
go build
cd bench
go test -bench=Bench

Example selecting a single row:

BenchmarkMeddlerRow-4      30000        42773 ns/op
BenchmarkSqlxRow-4         30000        41554 ns/op
BenchmarkSqlgenRow-4       50000        39664 ns/op

Selecting multiple rows:

BenchmarkMeddlerRows-4      2000      1025218 ns/op
BenchmarkSqlxRows-4         2000       807213 ns/op
BenchmarkSqlgenRows-4       2000       700673 ns/op

CAUTION - these figures might not be up to date.

Credits

This tool was derived from sqlgen by drone.io, which was itself inspired by scaneo.