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sqljdb.go
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sqljdb.go
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package jdb
import (
"database/sql"
"encoding/json"
"github.com/egustafson/uberwerks/jsondb-go/jsondb"
)
const (
create string = `
CREATE TABLE IF NOT EXISTS jsondb (
id STRING NOT NULL PRIMARY KEY,
data TEXT
);`
select_json string = `SELECT data FROM jsondb;`
select_ids string = `SELECT id FROM jsondb;`
select_by_id string = `SELECT data FROM jsondb WHERE id=?`
insert string = `INSERT INTO jsondb VALUES(?,?);`
delete_by_id string = `DELETE FROM jsondb WHERE id=?`
)
type SqlJDB struct {
DB *sql.DB
}
// static check: a sqlJDB ptr isA JDB interface
var _ JDB = (*SqlJDB)(nil)
func NewSqlJDB(db *sql.DB) JDB {
return &SqlJDB{DB: db}
}
func (jdb *SqlJDB) Ping() error {
return jdb.DB.Ping()
}
func (jdb *SqlJDB) List() ([]jsondb.JID, error) {
rows, err := jdb.DB.Query(select_ids)
if err != nil {
return nil, err
}
defer rows.Close()
list := make([]jsondb.JID, 0)
for rows.Next() {
var id string
err = rows.Scan(&id)
if err != nil {
return nil, err
}
list = append(list, jsondb.JID(id))
}
return list, nil
}
func (jdb *SqlJDB) Put(jo jsondb.JSONObj) (jsondb.JSONObj, error) {
id := jsondb.Identify(jo)
jsonb, err := json.Marshal(jo)
if err != nil {
return nil, err
}
_, err = jdb.DB.Exec(insert, string(id), string(jsonb))
if err != nil {
return nil, err
}
return jo, nil
}
func (jdb *SqlJDB) Get(id jsondb.JID) (jo jsondb.JSONObj, ok bool, err error) {
var jsonb []byte
err = jdb.DB.QueryRow(select_by_id, string(id)).Scan(&jsonb)
switch {
case err == sql.ErrNoRows:
ok = false
return nil, false, nil
case err != nil:
return nil, false, err
}
jo = make(jsondb.JSONObj)
if err := json.Unmarshal(jsonb, &jo); err != nil {
return nil, false, err
}
return jo, true, nil
}
func (jdb *SqlJDB) Del(id jsondb.JID) (ok bool, err error) {
var result sql.Result
if result, err = jdb.DB.Exec(delete_by_id, string(id)); err != nil {
return false, err
}
rowsAffected, _ := result.RowsAffected()
return (rowsAffected > 0), nil
}
func (jdb *SqlJDB) Dump() ([]jsondb.JSONObj, error) {
rows, err := jdb.DB.Query(select_json)
if err != nil {
return nil, err
}
defer rows.Close()
list := make([]jsondb.JSONObj, 0)
for rows.Next() {
jsonb := make([]byte, 0)
if err = rows.Scan(&jsonb); err != nil {
return nil, err
}
obj := make(jsondb.JSONObj)
if err = json.Unmarshal(jsonb, &obj); err != nil {
return nil, err
}
list = append(list, obj)
}
return list, nil
}
func (jdb *SqlJDB) Load(data []map[string]any) error {
for _, robj := range data {
obj := make(jsondb.JSONObj)
for k, v := range robj {
obj[jsondb.JID(k)] = v
}
if _, err := jdb.Put(obj); err != nil {
return err
}
}
return nil
}