99 lines
1.8 KiB
Go
99 lines
1.8 KiB
Go
package sqlite
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import (
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"database/sql"
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_ "github.com/mattn/go-sqlite3"
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"github.com/tursom/GoCollections/exceptions"
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"github.com/tursom/GoCollections/lang"
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"gitea.tursom.cn/tursom/kvs/kv"
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)
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type (
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sqliteKVS struct {
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lang.BaseObject
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db *sql.DB
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table string
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}
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)
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func New(db *sql.DB, table string) (kv.Store[[]byte, []byte], exceptions.Exception) {
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kvs := &sqliteKVS{
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db: db,
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table: table,
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}
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if err := kvs.createTable(); err != nil {
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return nil, err
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}
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return kvs, nil
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}
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func (s *sqliteKVS) createTable() exceptions.Exception {
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if _, err := s.db.Exec("create table if not exists " + s.table + " (" +
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"k blob primary key not null," +
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"v blob" +
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")"); err != nil {
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return exceptions.Package(err)
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}
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return nil
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}
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func (s *sqliteKVS) Get(key []byte) ([]byte, exceptions.Exception) {
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rows, err := s.db.Query("select v from "+s.table+" where k = ?", key)
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if err != nil {
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return nil, exceptions.Package(err)
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}
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defer rows.Close()
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if !rows.Next() {
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return nil, nil
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}
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var data []byte
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err = rows.Scan(&data)
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if err != nil {
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return nil, exceptions.Package(err)
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}
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return data, nil
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}
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func (s *sqliteKVS) Put(key []byte, value []byte) exceptions.Exception {
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if value == nil {
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value = []byte{}
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}
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exec, err := s.db.Exec("update "+s.table+" set v=? where k=?", value, key)
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if err != nil {
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return exceptions.Package(err)
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}
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affected, err := exec.RowsAffected()
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if err != nil {
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return exceptions.Package(err)
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}
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if affected != 0 {
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return nil
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}
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if _, err = s.db.Exec("insert into "+s.table+" (k,v) values (?,?)", key, value); err != nil {
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return exceptions.Package(err)
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}
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return nil
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}
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func (s *sqliteKVS) Delete(key []byte) exceptions.Exception {
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if _, err := s.db.Exec("delete from "+s.table+" where k=?", key); err != nil {
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return exceptions.Package(err)
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}
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return nil
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}
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