DBMS_LOB v16
The DBMS_LOB package lets you operate on large objects. The following table lists the supported functions and procedures. EDB Postgres Advanced Server's implementation of DBMS_LOB is a partial implementation when compared to Oracle's version. Only the functions and procedures listed in this table are supported.
| Function/procedure | Return type | Description |
|---|---|---|
APPEND(dest_lob IN OUT, src_lob) | n/a | Appends one large object to another. |
COMPARE(lob_1, lob_2 [, amount [, offset_1 [, offset_2 ]]]) | INTEGER | Compares two large objects. |
CONVERTOBLOB(dest_lob IN OUT, src_clob, amount, dest_offset IN OUT, src_offset IN OUT, blob_csid, lang_context IN OUT, warning OUT) | n/a | Converts character data to binary. |
CONVERTTOCLOB(dest_lob IN OUT, src_blob, amount, dest_offset IN OUT, src_offset IN OUT, blob_csid, lang_context IN OUT, warning OUT) | n/a | Converts binary data to character. |
COPY(dest_lob IN OUT, src_lob, amount [, dest_offset [, src_offset ]]) | n/a | Copies one large object to another. |
ERASE(lob_loc IN OUT, amount IN OUT [, offset ]) | n/a | Erases a large object. |
GET_STORAGE_LIMIT(lob_loc) | INTEGER | Gets the storage limit for large objects. |
GETLENGTH(lob_loc) | INTEGER | Gets the length of the large object. |
INSTR(lob_loc, pattern [, offset [, nth ]]) | INTEGER | Gets the position of the nth occurrence of a pattern in the large object starting at offset |
READ(lob_loc, amount IN OUT, offset, buffer OUT) | n/a | Reads a large object. |
SUBSTR(lob_loc [, amount [, offset ]]) | RAW, VARCHAR2 | Gets part of a large object. |
TRIM(lob_loc IN OUT, newlen) | n/a | Trims a large object to the specified length. |
WRITE(lob_loc IN OUT, amount, offset, buffer) | n/a | Writes data to a large object. |
WRITEAPPEND(lob_loc IN OUT, amount, buffer) | n/a | Writes data from the buffer to the end of a large object. |
The following table lists the public variables available in the package.
| Public variables | Data type | Value |
|---|---|---|
compress off | INTEGER | 0 |
compress_on | INTEGER | 1 |
deduplicate_off | INTEGER | 0 |
deduplicate_on | INTEGER | 4 |
default_csid | INTEGER | 0 |
default_lang_ctx | INTEGER | 0 |
encrypt_off | INTEGER | 0 |
encrypt_on | INTEGER | 1 |
file_readonly | INTEGER | 0 |
lobmaxsize | INTEGER | 1073741823 |
lob_readonly | INTEGER | 0 |
lob_readwrite | INTEGER | 1 |
no_warning | INTEGER | 0 |
opt_compress | INTEGER | 1 |
opt_deduplicate | INTEGER | 4 |
opt_encrypt | INTEGER | 2 |
warn_inconvertible_char | INTEGER | 1 |
Lengths and offsets are measured in bytes if the large objects are BLOB. Lengths and offsets are measured in characters if the large objects are CLOB.
append compare converttoblob converttoclob copy erase get_storage_limit getlength instr read substr trim write writeappend