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opdelete.go
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opdelete.go
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package edb
import (
"bytes"
"reflect"
)
func DeleteAll(c RawCursor) int {
tbl, tx := c.Table(), c.Tx()
var count int
keys := AllRawKeys(c)
for _, key := range keys {
if tx.DeleteByKeyRaw(tbl, key) {
count++
}
}
return count
}
func DeleteRow[Row any](txh Txish, row *Row) bool {
tx := txh.DBTx()
rowVal := reflect.ValueOf(row)
tbl := tableOf[Row](tx)
keyVal := tbl.RowKeyVal(rowVal)
return tx.DeleteByKeyVal(tbl, keyVal)
}
func DeleteByKey[Row any](txh Txish, key any) bool {
tx := txh.DBTx()
tbl := tableOf[Row](tx)
return tx.DeleteByKey(tbl, key)
}
func (tx *Tx) DeleteByKey(tbl *Table, key any) bool {
return tx.DeleteByKeyVal(tbl, reflect.ValueOf(key))
}
func (tx *Tx) DeleteByKeyVal(tbl *Table, keyVal reflect.Value) bool {
keyVal = tbl.ensureCorrectKeyType(keyVal)
keyBuf := keyBytesPool.Get().([]byte)
keyRaw := tbl.encodeKeyVal(keyBuf, keyVal, false)
defer keyBytesPool.Put(keyBuf[:0])
ok := tx.deleteByKeyRaw(tbl, keyRaw)
if tx.db.verbose {
if ok {
tx.db.logf("db: DELETE %s/%v", tbl.name, keyVal.Interface())
} else {
tx.db.logf("db: DELETE.NOOP %s/%v", tbl.name, keyVal.Interface())
}
}
return ok
}
func (tx *Tx) DeleteByKeyRaw(tbl *Table, keyRaw []byte) bool {
ok := tx.deleteByKeyRaw(tbl, keyRaw)
if tx.db.verbose {
if ok {
tx.db.logf("db: DELETE %s/%x", tbl.name, keyRaw)
} else {
tx.db.logf("db: DELETE.NOOP %s/%x", tbl.name, keyRaw)
}
}
return true
}
func (tx *Tx) deleteByKeyRaw(tbl *Table, keyRaw []byte) bool {
tableBuck := nonNil(tx.btx.Bucket(tbl.buck.Raw()))
dataBuck := nonNil(tableBuck.Bucket(dataBucket.Raw()))
ts := tx.db.tableState(tbl)
c := dataBuck.Cursor()
k, v := c.Seek(keyRaw)
if !bytes.Equal(k, keyRaw) {
return false
}
var old value
err := old.decode(v)
if err != nil {
panic(tableErrf(tbl, nil, keyRaw, err, "decoding old value"))
}
tx.markWritten()
del := prepareToDeleteIndexEntries(tableBuck, ts)
decodeIndexKeys(old.Index, del)
ensure(c.Delete())
return true
}