diff options
Diffstat (limited to 'innobase')
| -rw-r--r-- | innobase/row/row0mysql.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/innobase/row/row0mysql.c b/innobase/row/row0mysql.c index 9bc524189fd..1dfb1c4ee77 100644 --- a/innobase/row/row0mysql.c +++ b/innobase/row/row0mysql.c @@ -66,13 +66,23 @@ row_mysql_store_blob_ref( byte* dest, /* in: where to store */ ulint col_len, /* in: dest buffer size: determines into how many bytes the BLOB length is stored, - this may vary from 1 to 4 bytes */ - byte* data, /* in: BLOB data */ - ulint len) /* in: BLOB length */ + the space for the length may vary from 1 + to 4 bytes */ + byte* data, /* in: BLOB data; if the value to store + is SQL NULL this should be NULL pointer */ + ulint len) /* in: BLOB length; if the value to store + is SQL NULL this should be 0; remember + also to set the NULL bit in the MySQL record + header! */ { ulint sum = 0; ulint i; + /* MySQL might assume the field is set to zero except the length and + the pointer fields */ + + memset(dest, '\0', col_len); + /* In dest there are 1 - 4 bytes reserved for the BLOB length, and after that 8 bytes reserved for the pointer to the data. In 32-bit architectures we only use the first 4 bytes of the pointer |