sqllib

sqllib

Maintain a library of prepared SQL statements (*sql.Stmt)

WARNING

This repository has been moved to github.com/lestrrat-go/sqllib. This repository exists so that libraries pointing to this URL will keep functioning, but this repository will NOT be updated in the future. Please use the new import path.

SYNOPSIS

import (
  "github.com/lestrrat/go-sqllib"
  "github.com/pkg/errors"
)

var lib *sqllib.Library
var db *sql.DB

func InitializeDB() {
  db, _ = sql.Open(...)

  lib = sqllib.New(db)

  // Register some SQL queries by name
  lib.Register("Simple Select", "SELECT foo FROM bar WHERE a = ?")
}

func SomeFunc(tx *sql.Tx, arg string) error {
  // When you access the SQL query again, you can ask for an
  // already prepared statement.
  stmt, err := lib.GetStmt("Simple Select")
  if err != nil {
    return errors.Wrap(err, "failed to get statement")
  }

  // Don't forget to call (*sql.Tx).Stmt on it to make a 
  // transaction-specific statement
  rows, err := tx.Stmt(stmt).Query(arg)
  ...
}

DESCRIPTION

Using prepared statements repeatedly is usually better for performance.

Keeping prepared statements around for reuse is fairly painful. This library is a very small utility to store SQL queries and refer to them by name to get back already prepared statement.