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https://github.com/hexdigest/prep
Prep finds all SQL statements in a Go package and instruments db connection with prepared statements
https://github.com/hexdigest/prep
Last synced: about 1 month ago
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Prep finds all SQL statements in a Go package and instruments db connection with prepared statements
- Host: GitHub
- URL: https://github.com/hexdigest/prep
- Owner: hexdigest
- License: apache-2.0
- Created: 2017-12-11T23:47:38.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2017-12-19T17:35:51.000Z (over 6 years ago)
- Last Synced: 2024-04-21T01:00:38.548Z (about 1 month ago)
- Language: Go
- Size: 32.2 KB
- Stars: 32
- Watchers: 4
- Forks: 5
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Lists
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README
# Prep [](https://github.com/hexdigest/prep/blob/master/LICENSE) [](https://travis-ci.org/hexdigest/prep) [](https://coveralls.io/github/hexdigest/prep?branch=master) [](https://goreportcard.com/report/github.com/hexdigest/prep) [](http://godoc.org/github.com/hexdigest/prep)
Prep finds all SQL statements in a Go package and instruments db connection with prepared statements.
It allows you to benefit from the prepared SQL statements almost without any changes to your code.
Prep consists of two parts:
* A command line tool that finds all SQL statements in your code
* A package that instruments your code with prepared SQL statements using the found ones
# Usage
## Generate a list of SQL statements used in your application
$ cat example.go
```go
func main() {
db, err := sql.Open("mysql", "user:pass@tcp(localhost:3306)/mysql")
if err != nil {
panic(err)
}
const query = `SELECT CONCAT("Hello ", ?, "!")`
var s string
if err := db.QueryRow(query, "World").Scan(&s); err != nil {
panic(err)
}
fmt.Println(s)
}
```
Let's generate a list of the SQL statements used in your package:
```bash
$ prep -f github.com/hexdigest/prepdemo
$ cat prepared_statements.go
```
```go
//go:generate prep -f github.com/hexdigest/prepdemo
package main
var prepStatements = []string{
"SELECT CONCAT(\"Hello \", ?, \"!\")",
}
```
# Using prepared statements
```go
func main() {
sqlDB, err := sql.Open("mysql", "root:root@tcp(localhost:3306)/mysql")
if err != nil {
panic(err)
}
db, err := prep.NewConnection(sqlDB, prepStatements)
if err != nil {
panic(err)
}
const query = `SELECT CONCAT("Hello ", ?, "!")`
var s string
if err := db.QueryRow(query, "World").Scan(&s); err != nil {
panic(err)
}
fmt.Println(s)
}
```
Take a look at the line:
```go
db, err := prep.NewConnection(sqlDB, prepStatements)
```
It instruments your connection with prepared statements found by the generator.
The generated code already contains //go:generate instruction, so in order to update the statements list you can simply run:
```bash
$ go generate
```
# Some synthetic benchmarks
```bash
$ go test -bench=.
BenchmarkPostgresWithoutPreparedStatements-4 20000 59941 ns/op 1183 B/op 32 allocs/op
BenchmarkPostgresWithPreparedStatements-4 50000 41560 ns/op 1021 B/op 26 allocs/op
BenchmarkMySQLWithoutPreparedStatements-4 50000 26454 ns/op 827 B/op 23 allocs/op
BenchmarkMySQLWithPreparedStatements-4 200000 9509 ns/op 634 B/op 19 allocs/op
PASS
ok github.com/hexdigest/prep 7.884s
```