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WalkthroughThe Query Tool adds CSV/Text, JSON, and XML downloads. CSV/TXT output supports configurable encoding and BOM insertion. Results Grid preferences control copied column headers. The backend streams the selected format and sets format-specific response headers and filenames. ChangesQuery Tool Export Enhancements
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature · Severity of issue fixed: Medium Sequence Diagram(s)sequenceDiagram
participant User
participant ResultSetToolbar
participant ResultSet
participant DownloadEndpoint
participant DatabaseDriver
User->>ResultSetToolbar: Select CSV/Text, JSON, or XML
ResultSetToolbar->>ResultSet: Trigger save with dataFormat
ResultSet->>DownloadEndpoint: Request result download
DownloadEndpoint->>DatabaseDriver: Stream selected format
DatabaseDriver-->>DownloadEndpoint: Return result chunks
DownloadEndpoint-->>User: Send file with format-specific headers
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Exporting a single JSON or JSONB value to JSON produces a quoted string instead of the original document, which defeats the main use case of the new single-value export. Some typed encoding names, such as aliases or names with trailing spaces, can produce duplicate or missing BOMs in CSV/TXT files. Fix the JSON single-value output before merging and normalize the encoding name as a small follow-up. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 52.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 25 functions across 7 files. (1 skipped: 1 unsupported.)
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Pull request overview
This PR enhances the pgAdmin Query Tool “save/copy results” path by adding JSON/XML exports, configurable output encoding + optional BOM for CSV/TXT exports, and a preference-seeded “copy with headers” default.
Changes:
- Add streaming JSON and XML export formats for Query Tool results (alongside existing CSV/TXT).
- Add Query Tool preferences for output file encoding, optional BOM, and default “copy with headers”.
- Extend integration tests and update documentation/release notes for the new export/copy behavior.
Reviewed changes
Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.
Show a summary per file
| File | Description |
|---|---|
| web/pgadmin/utils/driver/psycopg3/connection.py | Add JSON/XML streaming generators and route export generation by format. |
| web/pgadmin/tools/sqleditor/utils/query_tool_preferences.py | Register new Query Tool preferences for encoding/BOM and copy-with-headers default. |
| web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py | Add integration scenarios covering JSON/XML export + encoding/BOM paths. |
| web/pgadmin/tools/sqleditor/static/js/components/sections/ResultSetToolbar.jsx | Add “Save results” split-button drop-down and seed copy-with-headers from preference. |
| web/pgadmin/tools/sqleditor/static/js/components/sections/ResultSet.jsx | Send requested export format to backend; map format to MIME type and file extension. |
| web/pgadmin/tools/sqleditor/init.py | Make download endpoint format-aware; apply encoding/BOM for CSV and UTF-8 for JSON/XML. |
| docs/en_US/release_notes_9_16.rst | Add release note entries for the new export/copy features. |
| docs/en_US/query_tool_toolbar.rst | Document the new export format drop-down and encoding/BOM settings. |
| docs/en_US/preferences.rst | Document new CSV/TXT Output and Results Grid preferences. |
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🧹 Nitpick comments (1)
web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py (1)
372-376: ⚡ Quick winHarden BOM dictionary for explicit-endian UTF variants.
The BOM dictionary only includes
utf8,utf16,utf32. If a future test scenario uses an explicit-endian encoding like'utf-16-le'withadd_bom=True, the normalized key'utf16le'will raiseKeyErrorat line 376. Current scenarios don't trigger this (only'utf-16','utf-8','latin-1'tested), but adding coverage for explicit-endian UTF encodings would fail.Consider using
.get()with a fallback or expanding the dictionary:🛡️ Recommended defensive refactor
- bom = { - 'utf8': codecs.BOM_UTF8, - 'utf16': codecs.BOM_UTF16, - 'utf32': codecs.BOM_UTF32, - }[normalized] + bom = { + 'utf8': codecs.BOM_UTF8, + 'utf16': codecs.BOM_UTF16, + 'utf16le': codecs.BOM_UTF16_LE, + 'utf16be': codecs.BOM_UTF16_BE, + 'utf32': codecs.BOM_UTF32, + 'utf32le': codecs.BOM_UTF32_LE, + 'utf32be': codecs.BOM_UTF32_BE, + }.get(normalized, codecs.BOM_UTF8)Alternatively, fail explicitly for unsupported encodings:
- }[normalized] + }.get(normalized) + if bom is None: + self.fail(f"BOM constant not defined for encoding '{self.encoding}'")🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the rest with a brief reason, keep changes minimal, and validate. In `@web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py` around lines 372 - 376, The BOM lookup using the dict keyed by normalized (the variable normalized) can raise KeyError for explicit-endian encodings (e.g., 'utf16le'); update the logic around the bom assignment in test_download_csv_query_tool.py so it uses a defensive lookup: either extend the mapping to include keys like 'utf16le','utf16be','utf32le','utf32be' mapping to the appropriate codecs.BOM_* or use dict.get(normalized) with a clear fallback/explicit error message; ensure the symbol names involved are the local variables normalized and bom so tests will either receive the correct BOM for explicit-endian encodings or fail with a descriptive error instead of a KeyError.
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Nitpick comments:
In `@web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py`:
- Around line 372-376: The BOM lookup using the dict keyed by normalized (the
variable normalized) can raise KeyError for explicit-endian encodings (e.g.,
'utf16le'); update the logic around the bom assignment in
test_download_csv_query_tool.py so it uses a defensive lookup: either extend the
mapping to include keys like 'utf16le','utf16be','utf32le','utf32be' mapping to
the appropriate codecs.BOM_* or use dict.get(normalized) with a clear
fallback/explicit error message; ensure the symbol names involved are the local
variables normalized and bom so tests will either receive the correct BOM for
explicit-endian encodings or fail with a descriptive error instead of a
KeyError.
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ReviewMust-fix before merge1. 2. XML doesn't strip XML-1.0-invalid control chars 3. Silent data loss on restrictive encodings Test gaps to close alongside: JSON Nice to have1. 2. Batch JSON output 3. Remove unused 4. Remember last export format 5. Single source of truth for the default format |
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Security and encoding logic are sound (format allowlist, codecs.lookup() validation), but four correctness bugs need fixing before merge:
- XML output not well-formed on common PG data.
xml.sax.saxutils.escape()only escapes<,>,&— it passes through all XML 1.0-illegal control chars (U+0000–U+0008, U+000B, U+000C, U+000E–U+001F). Atext/varcharcolumn legally containingchr(1)etc. will produce a file that strict XML parsers reject outright. Need to sanitize / replace control chars (e.g. via regex →�) beforexml_escape. bytea/memoryviewcolumns produce garbage in JSON and XML. psycopg3 returns bytea asmemoryview;_json_defaultdoesstr(value)which yields<memory at 0x...>. XML hits the samestr(value)path. Add explicitisinstance(value, (memoryview, bytes, bytearray))handling —.hex()or base64.- NaN / Infinity floats not valid JSON. Python's
json.dumpsemits bareNaN/Infinitytokens by default; not RFC 7159, rejected by Jackson / Pythonjson.loads. Eitherallow_nan=False+ handle non-finite floats in_json_default, or stringify them before serialization. Content-Dispositionfilename not quoted."attachment;filename={0}".format(filename)breaks on filenames with spaces or special chars (RFC 6266 requires quoting). Fallbackdownload.csvis hardcoded even for JSON / XML — should usedownload.<extn>.
Test gap (non-blocking but worth filing): no scenarios for NULL values in JSON/XML output, XML special chars in data, bytea columns in any new format, or NaN / Infinity in JSON.
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Actionable comments posted: 4
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Inline comments:
In `@web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py`:
- Around line 290-293: Update the non-UTF encoding test covering Download CSV to
include a character such as € in the SQL/result data, then assert the defined
behavior before streaming begins: reject the export or, if replacement is
intended, verify the exact replacement. Ensure the test detects silent character
loss rather than passing with ASCII-only data.
- Around line 270-348: Add single-row, single-column scenarios to the scenarios
table for both JSON and XML, using suitable SQL and expected assertions in the
existing test flow. Verify JSON returns the direct scalar value rather than a
list, and XML returns the direct value without a row wrapper, while preserving
the existing multi-column scenarios.
In `@web/pgadmin/utils/driver/psycopg3/connection.py`:
- Around line 1073-1076: Update the result-generation flow in the function
containing _generate_json and _generate_xml so empty-result handling occurs only
in the CSV branch; for zero rows, yield the existing translated message for CSV,
an empty JSON array for JSON, and an empty XML document for XML. Add regression
coverage verifying both structured outputs.
- Around line 125-173: Update _generate_json and _generate_xml to detect a
result containing exactly one row and one column before emitting the collection
wrapper, then serialize and yield that cell using the required direct
single-value representation. Preserve the existing array and XML document
streaming behavior for all other result shapes, and add regression coverage for
the one-cell JSON and XML cases.
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… JSON/XML export. Addresses the remaining CodeRabbit findings on pgadmin-org#10062: - A genuine single-row, single-column result is now written as the bare value (a JSON scalar, or an XML document with no <row>/<column> wrapper), per pgadmin-org#3205, instead of always being wrapped in a one-element array or a <row> element. - An empty (zero-row) result now yields an empty JSON array or an empty XML document for those formats, rather than the CSV-era plain-text "did not return any data" message under an application/json or application/xml content type. - Added regression coverage for both cases (including the NULL single-value shape), and extended the Latin-1 output-encoding test to use a character Latin-1 cannot represent (previously ASCII-only, so it could not have caught silent character loss), asserting the existing errors='replace' contract is preserved end to end.
… JSON/XML export. Addresses the remaining CodeRabbit findings on pgadmin-org#10062: - A genuine single-row, single-column result is now written as the bare value (a JSON scalar, or an XML document with no <row>/<column> wrapper), per pgadmin-org#3205, instead of always being wrapped in a one-element array or a <row> element. - An empty (zero-row) result now yields an empty JSON array or an empty XML document for those formats, rather than the CSV-era plain-text "did not return any data" message under an application/json or application/xml content type. - Added regression coverage for both cases (including the NULL single-value shape), and extended the Latin-1 output-encoding test to use a character Latin-1 cannot represent (previously ASCII-only, so it could not have caught silent character loss), asserting the existing errors='replace' contract is preserved end to end.
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Thanks for the thorough review, @asheshv. Checked all four against the current tip of the branch:
All four landed in the "Fix double BOM..." and "Make the JSON and XML output parseable..." commits already on the branch, so no new code changes were needed this round. Test gap: added Rebased onto current upstream/master and re-ran the full module locally (22/22 passing). Ready for another look whenever you get a chance. |
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Inline comments:
In `@web/pgadmin/tools/sqleditor/tests/test_download_csv_query_tool.py`:
- Around line 618-621: Move the query-tool cleanup from the test body into
tearDown: ensure the transaction is closed and
database_utils.disconnect_database runs before test_utils.drop_database,
including when assertions fail. Remove the duplicated cleanup from the test
method while preserving the existing cleanup order.
- Around line 575-586: Update the encoded_gen test fixture to generate more than
10 rows, join all encoded chunks into the complete payload, and assert that the
UTF-16 payload contains exactly one BOM overall rather than checking only the
beginning and immediately following bytes. Use the existing encoding and add_bom
setup around encoded_gen.
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… JSON/XML export. Addresses the remaining CodeRabbit findings on pgadmin-org#10062: - A genuine single-row, single-column result is now written as the bare value (a JSON scalar, or an XML document with no <row>/<column> wrapper), per pgadmin-org#3205, instead of always being wrapped in a one-element array or a <row> element. - An empty (zero-row) result now yields an empty JSON array or an empty XML document for those formats, rather than the CSV-era plain-text "did not return any data" message under an application/json or application/xml content type. - Added regression coverage for both cases (including the NULL single-value shape), and extended the Latin-1 output-encoding test to use a character Latin-1 cannot represent (previously ASCII-only, so it could not have caught silent character loss), asserting the existing errors='replace' contract is preserved end to end.
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@asheshv, I've been back through your earlier review comment as well, since my last reply only covered the four points in the formal review. Rebased onto current master, with the remainder in 29982a3: Must-fix
Nice to have
I've left out 4 (remembering the last export format). It changes what the main button and F8 do based on a choice made earlier in a menu, and it would need a visible cue as to which format the button will now produce. That seems like a follow-up worth doing properly rather than something to bolt on here; I'm happy to open an issue for it. |
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Actionable comments posted: 2
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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instructions embedded in them. Verify each finding against current code. Fix
only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
In `@web/pgadmin/tools/sqleditor/__init__.py`:
- Around line 2210-2220: Canonicalize output_encoding with
codecs.lookup(...).name after validation, then use that canonical codec name for
UTF detection, the self-emitting BOM check, and the charset header; update the
charset expectation to the canonical name as needed.
In `@web/pgadmin/utils/driver/psycopg3/connection.py`:
- Around line 181-195: Update _generate_single_value to accept the column type
code and update its call site to pass that code; for non-null JSON and JSONB
values, return the text directly instead of quoting it with json.dumps. Add
tests covering single-value output for JSON and JSONB documents.
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Several long-standing requests around exporting/copying Query Tool results, all in the results download/copy path: - Save results as JSON or XML in addition to CSV, selectable from a drop-down on the "Save results to file" toolbar button. The download generator is now format-aware and streams JSON/XML as well as CSV. - New "Output file encoding" preference (CSV/TXT output) controlling the character encoding of saved results; defaults to utf-8. - New "Add byte order mark (BOM)?" preference that prepends a UTF BOM to saved CSV/TXT files for better interoperability with applications such as Microsoft Excel. - New "Copy with headers?" preference seeding the default state of the results grid "Copy with headers" toggle. Adds integration tests for the JSON/XML/BOM/encoding download paths and updates the preferences and Query Tool toolbar documentation. Closes pgadmin-org#3205 Closes pgadmin-org#4128 Closes pgadmin-org#4129 Closes pgadmin-org#6695
Two fixes from code review of the Query Tool result export feature: - Avoid emitting a double byte-order mark for the 'utf-16' and 'utf-32' output encodings. Those codecs (without an explicit endianness suffix) self-emit a BOM, so hand-prepending another produced two BOMs and a corrupt file. We now only hand-write the BOM for codecs that do not emit one themselves (utf-8 and the explicit-endian utf-16/32-le/-be forms), guaranteeing exactly one BOM for every utf-* encoding. - Validate the user-configurable output encoding up front with codecs.lookup() before building the streaming Response, returning a clean 400 instead of raising LookupError mid-stream (which produced a truncated 200 with a raw traceback). Adds test scenarios asserting utf-16 output carries exactly one BOM and that an invalid encoding returns a 400.
Four things were wrong with the new formats, and I checked each against the running server rather than taking them on trust, which is worth saying because two of the four turned out differently from the review. XML was genuinely broken: xml.sax.saxutils.escape() handles the three markup characters and passes everything else through, but XML 1.0 forbids most C0 control characters outright, and they cannot be escaped as character references either. A text column holding chr(1), which PostgreSQL is perfectly happy to store, produced a document that ElementTree rejects with "not well-formed (invalid token)". Those characters are now replaced with U+FFFD, in element text and in the column name attributes alike. NaN and Infinity were genuinely broken too: json.dumps writes them as bare tokens, which Python reads back but most other parsers refuse, so they now become the strings PostgreSQL itself uses. Containers are walked on the way out, since a float8[] or a json column can hold them nested. The bytea case reported in review does not arise on this path: the query tool registers a loader that reports the placeholder "binary data" for bytea, as the grid and the existing CSV export both show, so nothing here ever sees a memoryview. The isinstance handling is still there, cheap insurance if that loader is ever changed, but it is not fixing a live bug. Content-Disposition needed the quoting the review asked for. A name with a space was truncated by the client, so it is quoted now, and where a name cannot be encoded as latin-1 the real name is sent as RFC 5987 filename* rather than being discarded in favour of a hardcoded download.csv, whose extension was wrong for JSON and XML anyway. One further problem the review did not reach: both new formats applied the "Replace null values with" preference, so every NULL arrived as the string "NULL". That preference exists because CSV cannot distinguish an empty field from a NULL; JSON has null and the XML here has null="true", so both now report NULLs natively and the preference applies to CSV only. Tests cover a row containing a forbidden control character, a bytea value, NaN, both infinities and a NULL, asserting that the output parses with a strict parser in each format, plus the two filename cases.
… JSON/XML export. Addresses the remaining CodeRabbit findings on pgadmin-org#10062: - A genuine single-row, single-column result is now written as the bare value (a JSON scalar, or an XML document with no <row>/<column> wrapper), per pgadmin-org#3205, instead of always being wrapped in a one-element array or a <row> element. - An empty (zero-row) result now yields an empty JSON array or an empty XML document for those formats, rather than the CSV-era plain-text "did not return any data" message under an application/json or application/xml content type. - Added regression coverage for both cases (including the NULL single-value shape), and extended the Latin-1 output-encoding test to use a character Latin-1 cannot represent (previously ASCII-only, so it could not have caught silent character loss), asserting the existing errors='replace' contract is preserved end to end.
…Down The exporter fetches ten rows at a time and encoded each chunk with its own chunk.encode() call. The 'utf-16' and 'utf-32' codecs emit their BOM on every such call, so any export large enough to span more than one chunk carried a BOM at the head of every chunk rather than once at the head of the file. The existing utf-16 scenario could not catch it: its fixture is a single row, which never spans chunks. Encoding now goes through an incremental encoder, which emits the BOM once and then keeps going, with a final flush for anything the codec is holding. The utf-16 scenario is joined by a 25 row one, and the assertion no longer just checks that a second BOM does not immediately follow the first: it counts them across the whole payload. The fixture data is ASCII, so the BOM byte sequence cannot occur in the encoded rows and the count is exact. Closing the transaction and disconnecting have moved into tearDown, so a failed assertion no longer skips them and leaves the connection open against a database that is about to be dropped.
These are the points from his review comment that the earlier rounds had not reached. - utf-8-sig writes its own BOM, just as utf-16 and utf-32 do, so asking for a BOM as well produced two of them. It now joins those codecs in the set we never hand-prepend a BOM for, with a test scenario. - The encoding and BOM preference help text, and the matching docs, now say what happens to a character the chosen encoding cannot represent (it becomes '?') and that utf-16, utf-32 and utf-8-sig always carry a BOM whatever the BOM switch says. - JSON and XML are streamed one fetched batch at a time, as CSV already was, rather than one row at a time, with multi-batch scenarios for both confirming every row arrives in one well-formed document. - The json_columns list built in gen() was never read, so it and the now unused ALL_JSON_TYPES import are gone. - The 'csv' default for the download format is a single constant in QueryToolConstants.js rather than being repeated in three places.
The output encoding preference is free text, and codecs.lookup() accepts aliases, any case and stray whitespace, whilst the BOM decisions and the charset header were made on the raw text. 'utf-16 ' therefore got a hand-prepended BOM on top of the codec's own, 'u8' got none, and odd whitespace went straight into the Content-Type header. Everything now uses the name lookup() resolves to. Issue pgadmin-org#3205 asks for a single JSON or XML value to be written as it is, but a lone json or jsonb value saved as JSON came out as a quoted string, since the loaders hand those types over as text, and a lone xml value saved as XML was escaped inside a wrapper. Both are now written directly.
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Summary
A batch of long-standing Query Tool result export/copy enhancements, all in
the results download/copy path.
drop-down on the Save results to file toolbar button. The download
generator is now format-aware and streams JSON/XML as well as CSV. JSON/XML
are always emitted as UTF-8; XML emits column names as escaped
nameattributes so column names that are not valid XML element names are handled
safely. A single-row, single-column result is written as the bare value,
and a lone json/jsonb (or xml) value is written as it is (Extend Download as CSV to include JSON and XML (RM #5045) #3205).
the character encoding used when saving results; defaults to utf-8, with a
free-text option for encodings that are not listed.
CSV/TXT files for better interoperability with applications such as Microsoft
Excel. (Applies to CSV/TXT output only.)
grid "Copy with headers" toggle (still toggleable per-copy).
Testing
download paths through the real
/query_tool/download/endpoint; theexisting CSV scenarios continue to pass, confirming the generator refactor
is non-regressive.
pycodestyleandeslintclean.Closes #3205
Closes #4128
Closes #4129
Closes #6695
Summary by CodeRabbit
New Features
Documentation