Programming language: Go
License: MIT License
Tags: Database    
Latest version: v1.1.0

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qry is a general purpose library for storing your raw database queries in .sql files with all benefits of modern IDEs, instead of strings and constants in the code, and using them in an easy way inside your application with all the profit of compile time constants.

qry recursively loads all .sql files from a specified folder, parses them according to predefined rules and returns a reusable object, which is actually just a map[string]string with some sugar. Multiple queries inside a single file are separated with standard SQL comment syntax: -- qry: QueryName. A QueryName must match [A-Za-z_]+.

gen tool is used for automatic generation of constants for all user specified query_names.


go get -u github.com/HnH/qry/cmd/qry-gen


Prepare sql files: queries/one.sql:

-- qry: InsertUser
INSERT INTO `users` (`name`) VALUES (?);

-- qry: GetUserById
SELECT * FROM `users` WHERE `user_id` = ?;

And the second one queries/two.sql:

-- qry: DeleteUsersByIds
DELETE FROM `users` WHERE `user_id` IN ({ids});

Generate constants: qry-gen -dir=./queries -pkg=/path/to/your/go/pkg Will produce /path/to/your/go/pkg/qry.go with:

package pkg

const (
    // one.sql
    InsertUser  = "INSERT INTO `users` (`name`) VALUES (?);"
    GetUserById = "SELECT * FROM `users` WHERE `user_id` = ?;"

    // two.sql
    DeleteUsersByIds = "DELETE FROM `users` WHERE `user_id` IN ({ids});"

As a best practice include this qry-gen call in your source code with go:generate prefix: //go:generate qry-gen -dir=./queries -pkg=/path/to/your/go/pkg and just execute go generate before each build. Now it's time to use qry inside your project:

func main() {
     * The most obvious way is to use generated constants in the source code

    // INSERT INTO `users` (`name`) VALUES (?);

    // DELETE FROM `users` WHERE `user_id` IN (?,?,?);
    println(qry.Query(pkg.DeleteUsersByIds).Replace("{ids}", qry.In(3)))

     * As an alternative you can manually parse .sql files in the directory and work with output
    if q, err := qry.Dir("/path/to/your/go/pkg/queries"); err != nil {

    // SELECT * FROM `users` WHERE `user_id` = ?;

    // DELETE FROM `users` WHERE `user_id` IN (?,?,?);
    println(q["two.sql"]["DeleteUsersByIds"].Replace("{ids}", qry.In(3)))