Masterminds/squirrel

External

• https://github.com/Masterminds/squirrel
• https://medium.com/nerd-for-tech/postgres-libraries-to-try-with-go-8f80191edbff

Internal

• PostgreSQL Support in Go

Overview

Squirrel is a fluent SQL generator for Go. It helps build SQL queries from composable parts representing the SQL SELECT query clauses: SELECT, FROM, JOIN, WHERE, etc. and also other DML statements.

Installation

go get github.com/Masterminds/squirrel

Programming Model

Queries

import sq "github.com/Masterminds/squirrel"

// Get a database/sql database handle
dbHandle = getDbHandle()

// Build the query with a fluent API
query = sq.Select("*").From("person")

// execute the query with the database handle; the syntax is identical to that used with dbHandle.Query()
rows, err := query.RunWith(dbHandle).Query()
if err != nil { ... }
defer func() {
	if err = rows.Close(); err != nil { ... }
}()
for rows.Next() {
	var (
		id   int
		name string
		city sql.NullString
	)
	if err = rows.Scan(&id, &name, &city); err != nil { ... }
	fmt.Printf("id: %d, name: %s, city: %s\n", id, name, city.String)
}

getDbHandle() can be implemented as shown in:

Connect to a PostgreSQL Database with database/sql API and a pgx Driver

Parameterized Statements

The format of the parameterized statements depends on the database. For example, in PostgreSQL, the placeholders are introduced by $ and have numerical values, etc.