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Incremental blobs.

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Nuno Cruces
2023-02-27 13:45:32 +00:00
parent ce6d0627b2
commit 1b3823483f
6 changed files with 183 additions and 48 deletions
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14
blob.go
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@@ -22,7 +22,7 @@ var _ io.ReadWriteSeeker = &Blob{}
// OpenBlob opens a BLOB for incremental I/O.
//
// https://www.sqlite.org/c3ref/blob_open.html
func (c *Conn) OpenBlob(db, table, column string, row uint64, write bool) (*Blob, error) {
func (c *Conn) OpenBlob(db, table, column string, row int64, write bool) (*Blob, error) {
defer c.arena.reset()
blobPtr := c.arena.new(ptrlen)
dbPtr := c.arena.string(db)
@@ -36,7 +36,7 @@ func (c *Conn) OpenBlob(db, table, column string, row uint64, write bool) (*Blob
r := c.call(c.api.blobOpen, uint64(c.handle),
uint64(dbPtr), uint64(tablePtr), uint64(columnPtr),
row, flags, uint64(blobPtr))
uint64(row), flags, uint64(blobPtr))
if err := c.error(r[0]); err != nil {
return nil, err
@@ -144,3 +144,13 @@ func (b *Blob) Seek(offset int64, whence int) (int64, error) {
b.offset = offset
return offset, nil
}
// Reopen moves a BLOB handle to a new row of the same database table.
//
// https://www.sqlite.org/c3ref/blob_reopen.html
func (b *Blob) Reopen(row int64) error {
r := b.c.call(b.c.api.blobReopen, uint64(b.handle), uint64(row))
b.bytes = int64(b.c.call(b.c.api.blobBytes, uint64(b.handle))[0])
b.offset = 0
return b.c.error(r[0])
}