Sqrl - SQL query builder, fork of Squirrel with improved performance

Sqrl

Requires Go 1.8 and higher

Inspired by

Why to make good squirrel lighter?

Ask benchmarks about that ;). Squirrel is good, reliable and thread-safe with it’s immutable query builder. Although immutability is nice, it’s resource consuming and sometimes redundant. As authors of dbr say: “100% of our application code was written without the need for this”.

Why not to use dbr then?

Although, dbr 's query builder is proven to be much faster than squirrel and even faster than sqrl, it doesn’t have all syntax sugar. Especially I miss support of JOINs, subqueries and aliases.

Usage

sqrl is not an ORM. , it helps you build SQL queries from composable parts. sqrl is non thread safe . SQL builders change their state, so using the same builder in parallel is dangerous.

It’s very easy to switch between original squirrel and sqrl, because there is no change in interface:

import sq “github.com/elgris/sqrl” // you can easily use github.com/lann/squirrel here

users := sq.Select("").From(“users”).Join(“emails USING (email_id)”)*

active := users.Where(sq.Eq{“deleted_at”: nil})

sql, args, err := active.ToSql()

sql == “SELECT * FROM users JOIN emails USING (email_id) WHERE deleted_at IS NULL”
sql, args, err := sq.

Insert("users").Columns("name", "age").
Values("moe", 13).Values("larry", sq.Expr("? + 5", 12)).
ToSql()

sql == “INSERT INTO users (name,age) VALUES (?,?),(?,? + 5)”

Like squirrel, sqrl can execute queries directly:

stooges := users.Where(sq.Eq{“username”: []string{“moe”, “larry”, “curly”, “shemp”}})
three_stooges := stooges.Limit(3)
rows, err := three_stooges.RunWith(db).Query()

// Behaves like:
rows, err := db.Query(“SELECT * FROM users WHERE username IN (?,?,?,?) LIMIT 3”, “moe”, “larry”, “curly”, “shemp”)

Build conditional queries with ease:

if len(q) > 0 { users = users.Where(“name LIKE ?”, q) }

MySQL-specific functions

Multi-table delete

sql, args, err := sq.Delete(“a1”, “a2”).

From("z1 AS a1").
JoinClause("INNER JOIN a2 ON a1.id = a2.ref_id").
Where("b = ?", 1).
ToSql()

sql, args, err := sq.Delete(“a1”).

Using("a2").
Where("a1.id = a2.ref_id AND a2.num = ?", 42).
ToSql()

PostgreSQL-specific functions

Package pg contains PostgreSQL specific operators.

Update from

sql, args, err := sq.Update(“a1”).

Set("foo", 1).
From("a2").
Where("id = a2.ref_id AND a2.num = ?", 42).
ToSql()

Delete using

sql, args, err := sq.Update(“a1”).

Set("foo", 1).
From("a2").
Where("id = a2.ref_id AND a2.num = ?", 42).
ToSql()

Returning clause

sql, args, err := sq.Delete(“a1”).

Using("a2").
Where("id = a2.ref_id AND a2.num = ?", 42).
ToSql()

JSON values

JSON and JSONB use json.Marshal to serialize values and cast them to appropriate column type.

sql, args, err := Update(“a”).

Set("foo", 1).
Where("id = ?", 42).
Returning("bar").
ToSql()

Array values

Array serializes single and multidimensional slices of string, int, float32 and float64 values.

sql, args, err := sq.Insert(“posts”).

Columns("content", "tags").
Values("Lorem Ipsum", pg.JSONB([]string{"foo", "bar"})).
ToSql()

License

sql, args, err := sqrl.Insert(“posts”).

Columns("content", "tags").
Values("Lorem Ipsum", pg.Array([]string{"foo", "bar"})).
ToSql()

Nguồn : GitHub