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sqlite.go
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sqlite.go
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// Copyright (c) 2017
// Author: Jeff Weisberg <jaw @ tcp4me.com>
// Created: 2018-Jul-13 10:53 (EDT)
// Function:
package sqlite
import (
"database/sql"
"encoding/base64"
_ "github.com/mattn/go-sqlite3"
"strings"
"github.com/jaw0/acdiag"
)
type Be struct {
name string
path string
db *sql.DB
}
var dl = diag.Logger("sqlite")
func Open(name string, path string) (*Be, error) {
dl.Debug("opening sqlite '%s'", path)
db, err := sql.Open("sqlite3", path)
if err != nil {
return nil, err
}
be := &Be{
name: name,
path: path,
db: db,
}
be.init()
return be, nil
}
func (be *Be) Close() {
be.db.Close()
}
func (be *Be) Get(sub string, key string) ([]byte, bool, error) {
dl.Debug("get %s/%s/%s", be.name, sub, key)
rows, err := be.db.Query("select value, 1 from ykv where map = ? and sub = ? and key = ?", be.name, sub, key)
if err != nil {
return nil, false, err
}
var val string
var found bool
rows.Next()
rows.Scan(&val, &found)
rows.Close()
if !found {
return nil, false, nil
}
v, _ := base64.StdEncoding.DecodeString(val)
return v, true, nil
}
func (be *Be) Put(sub string, key string, val []byte) error {
dl.Debug("put %s/%s/%s", be.name, sub, key)
tx, _ := be.db.Begin()
_, err := tx.Exec("delete from ykv where map = ? and sub = ? and key = ?", be.name, sub, key)
n, err := tx.Exec("insert into ykv (map,sub,key,value) values (?,?,?,?)",
be.name, sub, key, base64.StdEncoding.EncodeToString(val))
tx.Commit()
dl.Debug("err %v", n, err)
return err
}
func (be *Be) Del(sub string, key string) error {
dl.Debug("del %s/%s/%s", be.name, sub, key)
_, err := be.db.Exec("delete from ykv where map = ? and sub = ? and key = ?", be.name, sub, key)
return err
}
func (be *Be) Range(sub string, start string, end string, lambda func(string, []byte) bool) error {
var rows *sql.Rows
var err error
if end != "" {
rows, err = be.db.Query("select key, value from ykv where map = ? and sub = ? and key >= ? and key < ?", be.name, sub, start, end)
} else {
rows, err = be.db.Query("select key, value from ykv where map = ? and sub = ? and key >= ?", be.name, sub, start)
}
if err != nil {
return err
}
for rows.Next() {
var k string
var v string
rows.Scan(&k, &v)
val, _ := base64.StdEncoding.DecodeString(v)
ok := lambda(k, val)
if !ok {
break
}
}
rows.Close()
return nil
}
//################################################################
func (be *Be) init() {
for _, sql := range strings.Split(initsql, ";") {
sql = strings.Trim(sql, " \t\n\r")
if sql != "" {
dl.Debug("sql: %s", sql)
_, err := be.db.Exec(sql)
if err != nil {
dl.Fatal("err %v", err)
}
}
}
}
const initsql = `
create table if not exists ykv (
map text not null,
sub text not null,
key text not null,
value text,
unique(map,sub,key)
);
create index if not exists ykvidx on ykv(map, sub, key);
pragma synchronous = 1;
pragma cache_size = 100000;
vacuum;
analyze;
`