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keyvSqlite3.go
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keyvSqlite3.go
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package keyvsqlite3
import (
"strings"
"github.com/jmoiron/sqlx"
_ "github.com/mattn/go-sqlite3"
"github.com/simba-fs/keyv"
)
const createTable = `CREATE TABLE IF NOT EXISTS keyv (
key string PRIMARY KEY UNIQUE,
value string
);`
type keyvData struct {
Key string `db:"key"`
Value string `db:"value"`
}
type adapter struct {
db *sqlx.DB
}
func (a adapter) Has(key string) bool {
data := keyvData{}
err := a.db.Get(&data, `SELECT * FROM keyv WHERE key = $1`, key)
if err != nil {
return false
}
if data.Key == "" && data.Value == "" {
return false
}
return true
}
func (a adapter) Get(key string) (string, error) {
data := keyvData{}
err := a.db.Get(&data, `SELECT * FROM keyv WHERE key = $1`, key)
if err != nil {
return "", err
}
return data.Value, nil
}
func (a adapter) Set(key string, val string) error {
data := keyvData{
Key: key,
Value: val,
}
_, err := a.db.NamedExec(`INSERT OR REPLACE INTO keyv VALUES (:key, :value)`, data)
return err
}
func (a adapter) Remove(key string) error {
_, err := a.db.Exec(`DELETE FROM keyv WHERE key = $1`, key)
return err
}
func (a adapter) Clear(prefix string) error {
// get all keys
keys, err := a.Keys()
if err != nil {
return err
}
stmt, err := a.db.Preparex(`DELETE FROM keyv WHERE key=$1`)
if err != nil {
return err
}
for _, key := range keys {
if strings.HasPrefix(key, prefix) {
_, err := stmt.Exec(key)
if err != nil {
return err
}
}
}
return nil
}
func (a adapter) Keys() ([]string, error) {
data := []keyvData{}
err := a.db.Select(&data, `SELECT key FROM keyv`)
if err != nil {
return make([]string, 0), err
}
keys := make([]string, len(data))
for index, value := range data {
keys[index] = value.Key
}
return keys, nil
}
type adapterNewer struct{}
func (a adapterNewer) Connect(uri string) (keyv.Adapter, error) {
uri = strings.SplitN(uri, "://", 2)[1]
db, err := sqlx.Connect("sqlite3", uri)
if err != nil {
return nil, err
}
// create table
_, err = db.Exec(createTable)
if err != nil {
return nil, err
}
adapter := adapter{
db: db,
}
return adapter, nil
}
func init() {
adapterNewer := adapterNewer{}
keyv.Register("sqlite3", adapterNewer)
}