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Fix mappings between LCIDs and code pages. (#169)
* Fix mappings between LCIDs and code pages. * Add test for fetching various LCIDs. * Address Github automation feedback. * Refine comments. --------- Co-authored-by: Sergey Ten <sergeyten@microsoft.com>
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package mssql | ||
|
||
import ( | ||
"bytes" | ||
"database/sql" | ||
"encoding/binary" | ||
"testing" | ||
) | ||
|
||
// SQL that generates other SQLs for running comparisons. | ||
// It does not create any persisent database objects, | ||
// employing CTEs instead. The structure of CTEs is pretty | ||
// self-explanatory, with one CTE per code page containing | ||
// all available LCIDs. The exception is code page 1252, which | ||
// contains all LCIDs not included in all other CTEs. | ||
// | ||
// There are some test integrity assertions that: | ||
// 1. Ensure that all LCIDs in the system (as returned by sys.fn_helpcollations()) | ||
// are covered by the test. | ||
// 2. The 1252 CTE does not return any "leaked" code pages that are not 1252. | ||
// 3. All code pages come with sample reference data for fetching comparison. | ||
// | ||
// None of the SQL syntax uses any SQL Server version-specific syntax, | ||
// and should work on any version without change. | ||
const comparisonQueriesGeneratorSQL = ` | ||
-- | ||
-- Generates SELECT statements for fetching data encoded with various code pages | ||
-- along with the same data encoded in UTF-16. | ||
-- The client can execute the generated queries and compare "codepage_data" column | ||
-- with the original data returned in the "reference_data" column. | ||
-- | ||
-- Single-byte code pages contain the entire range of 128-255 byte values as sample data. | ||
-- Double-byte code pages contain a representative sample text since it is not practical | ||
-- to provide the entire range of possible characters. | ||
-- | ||
-- The format of the query is | ||
-- SELECT | ||
-- N'<sample data>' AS [reference_data] | ||
-- , CAST(N'<sample data> COLLATE <collation with the given code page and lcid> AS VARCHAR(1000)) AS [codepage_data] | ||
-- This way the conversion from Nvarchar to Varchar does not depend on the collation | ||
-- of the currently active database. | ||
-- | ||
-- The dirver's job is to fetch both columns and compare them. If the codepage/LCID mapping is done wrong, | ||
-- the comparison will fail. | ||
-- | ||
with | ||
cte_data (cp, datasample) as ( | ||
-- Thai | ||
select 874, N'€…‘’“”•–—กขฃคฅฆงจฉชซฌฎฏฐฑฒณดตถทธนบปผฝพฟภมยรฤลฦวศษสหฬอฮฯะัาำิีึืฺุู฿เแโใไๅๆ็่้๊๋์ํ๎๏๐๑๒๓๔๕๖๗๘๙๚๛' | ||
union all | ||
-- Japanese (double-byte encoding, so provide a sample rather than the entire range) | ||
select 932, N'産業通商資源部の安徳根(アン・ドクグン)長官は「今後もモバイル・ワールド・コングレス(MWC)など海外の見本市で統合韓国館を拡大し、参加企業の成果を高める」との方針を示した。' | ||
union all | ||
-- Chinese Simplified (double-byte encoding, so provide a sample rather than the entire range) | ||
select 936, N'乘坐“蓝梦之星”号邮轮访问济州的中国团体游客造访新罗免税店济州分店。' | ||
union all | ||
-- Chinese Traditional (double-byte encoding, so provide a sample rather than the entire range) | ||
select 950, N'首相弗雷澤里克森在首相府和國會所在地克里斯蒂安堡宮的露台上,向民眾公布王儲正式登基成為國王。' | ||
union all | ||
-- Korean (double-byte encoding, so provide a sample rather than the entire range) | ||
select 949, N'홍성은 마늘과 한돈, 김 등 산지로 유명하지만, 그동안 상대적으로 시설원예 분야에서는 취약하다는 평가를 받았다.' | ||
union all | ||
-- Central European (Czech, Slovak, Polish, Hungarian, etc.) | ||
select 1250, N'€‚„…†‡‰Š‹ŚŤŽŹ‘’“”•–—™š›śťžźˇ˘Ł¤Ą¦§¨©Ş«¬®Ż°±˛ł´µ¶·¸ąş»Ľ˝ľżŔÁÂĂÄĹĆÇČÉĘËĚÍÎĎĐŃŇÓÔŐÖ×ŘŮÚŰÜÝŢßŕáâăäĺćçčéęëěíîďđńňóôőö÷řůúűüýţ˙' | ||
union all | ||
-- Cyrillic | ||
select 1251, N'ЂЃ‚ѓ„…†‡€‰Љ‹ЊЌЋЏђ‘’“”•–—™љ›њќћџЎўЈ¤Ґ¦§Ё©Є«¬®Ї°±Ііґµ¶·ё№є»јЅѕїАБВГДЕЖЗИЙКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯабвгдежзийклмнопрстуфхцчшщъыьэюя' | ||
union all | ||
-- Generic Latin | ||
select 1252, N'€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖ×ØÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ' | ||
union all | ||
-- Greek | ||
select 1253, N'€‚ƒ„…†‡‰‹‘’“”•–—™›΅Ά£¤¥¦§¨©«¬®―°±²³΄µ¶·ΈΉΊ»Ό½ΎΏCxΐΑΒΓΔΕΖΗΘΙΚΛΜΝΞΟΠΡΣΤΥΦΧΨΩΪΫάέήίΰαβγδεζηθικλμνξοπρςστυφχψωϊϋόύώ' | ||
union all | ||
-- Turkish | ||
select 1254, N'€‚ƒ„…†‡ˆ‰Š‹Œ‘’“”•–—˜™š›œŸ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏĞÑÒÓÔÕÖ×ØÙÚÛÜİŞßàáâãäåæçèéêëìíîïğñòóôõö÷øùúûüışÿ' | ||
union all | ||
-- Hebrew | ||
select 1255, N'€‚ƒ„…†‡ˆ‰‹‘’“”•–—˜™›¡¢£₪¥¦§¨©×«¬®¯°±²³´µ¶·¸¹÷»¼½¾¿ְֱֲֳִֵֶַָֻּֽ־ֿ׀ׁׂ׃װױײ׳״אבגדהוזחטיךכלםמןנסעףפץצקרשת' | ||
union all | ||
-- Arabic | ||
select 1256, N'€پ‚ƒ„…†‡ˆ‰ٹ‹Œچژڈگ‘’“”•–—ک™ڑ›œں،¢£¤¥¦§¨©ھ«¬®¯°±²³´µ¶·¸¹؛»¼½¾؟ہءآأؤإئابةتثجحخدذرزسشصض×طظعغـفقكàلâمنهوçèéêëىيîô÷ùûüے' | ||
union all | ||
-- Baltic countries (Estonia, Latvia, Lithuania) | ||
select 1257, N'€‚„…†‡‰‹¨ˇ¸‘’“”•–—™›¯˛¢£¤¦§Ø©Ŗ«¬®Æ°±²³´µ¶·ø¹ŗ»¼½¾æĄĮĀĆÄÅĘĒČÉŹĖĢĶĪĻŠŃŅÓŌÕÖ×ŲŁŚŪÜŻŽßąįāćäåęēčéźėģķīļšńņóōõö÷ųłśūüżž˙' | ||
union all | ||
-- Vietnamese | ||
select 1258, N'€‚ƒ„…†‡ˆ‰‹Œ‘’“”•–—˜™›œŸ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂĂÄÅÆÇÈÉÊËÍÎÏĐÑÓÔƠÖ×ØÙÚÛÜƯßàáâăäåæçèéêëíîïđñóôơö÷øùúûüư₫ÿ' | ||
), | ||
cte_cp874 (cp, lcid, collation) as ( | ||
select 874, 0x0000041e, N'Thai_100_BIN2' | ||
), | ||
cte_cp932 (cp, lcid, collation) as ( | ||
select 932, 0x00000411, N'Japanese_XJIS_100_BIN2' | ||
union all select 932, 0x00010411, N'Japanese_Unicode_BIN2' | ||
union all select 932, 0x00040411, N'Japanese_Bushu_Kakusu_100_BIN2' | ||
), | ||
cte_cp936 (cp, lcid, collation) as ( | ||
select 936, 0x00000804, N'Chinese_Simplified_Pinyin_100_BIN2' | ||
union all select 936, 0x00020804, N'Chinese_Simplified_Stroke_Order_100_BIN2' | ||
), | ||
cte_cp949 (cp, lcid, collation) as ( | ||
select 949, 0x00000412, N'Korean_100_BIN2' | ||
), | ||
cte_cp950 (cp, lcid, collation) as ( | ||
select 950, 0x00000404, N'Chinese_Traditional_Stroke_Count_100_BIN2' | ||
union all select 950, 0x00001404, N'Chinese_Traditional_Pinyin_100_BIN2' | ||
union all select 950, 0x00000c04, N'Chinese_Hong_Kong_Stroke_90_BIN2' | ||
union all select 950, 0x00030404, N'Chinese_Traditional_Bopomofo_100_BIN2' | ||
union all select 950, 0x00021404, N'Chinese_Traditional_Stroke_Order_100_BIN2' | ||
), | ||
cte_cp1250 (cp, lcid, collation) as ( | ||
select 1250, 0x0000041c, N'Albanian_100_BIN2' | ||
union all select 1250, 0x0000041a, N'Croatian_100_BIN2' | ||
union all select 1250, 0x00000405, N'Czech_100_BIN2' | ||
union all select 1250, 0x0000040e, N'Hungarian_100_BIN2' | ||
union all select 1250, 0x00000415, N'Polish_100_BIN2' | ||
union all select 1250, 0x00000418, N'Romanian_100_BIN2' | ||
union all select 1250, 0x0000041b, N'Slovak_100_BIN2' | ||
union all select 1250, 0x00000424, N'Slovenian_100_BIN2' | ||
union all select 1250, 0x0001040e, N'Hungarian_Technical_100_BIN2' | ||
union all select 1250, 0x00000442, N'Turkmen_100_BIN2' | ||
union all select 1250, 0x0000081A, N'Serbian_Latin_100_BIN2' | ||
union all select 1250, 0x0000141A, N'Bosnian_Latin_100_BIN2' | ||
), | ||
cte_cp1251 (cp, lcid, collation) as ( | ||
select 1251, 0x0000042f, N'Macedonian_FYROM_100_BIN2' | ||
union all select 1251, 0x00000419, N'Cyrillic_General_100_BIN2' | ||
union all select 1251, 0x00000c1a, N'Serbian_Cyrillic_100_BIN2' | ||
union all select 1251, 0x00000422, N'Ukrainian_100_BIN2' | ||
union all select 1251, 0x0000043f, N'Kazakh_100_BIN2' | ||
union all select 1251, 0x00000444, N'Tatar_100_BIN2' | ||
union all select 1251, 0x0000082c, N'Azeri_Cyrillic_100_BIN2' | ||
union all select 1251, 0x0000046D, N'Bashkir_100_BIN2' | ||
union all select 1251, 0x00000485, N'Yakut_100_BIN2' | ||
union all select 1251, 0x0000201A, N'Bosnian_Cyrillic_100_BIN2' | ||
), | ||
cte_cp1253 (cp, lcid, collation) as ( | ||
select 1253, 0x00000408, N'Greek_100_BIN2' | ||
), | ||
cte_cp1254 (cp, lcid, collation) as ( | ||
select 1254, 0x0000041f, N'Turkish_100_BIN2' | ||
union all select 1254, 0x0000042c, N'Azeri_Latin_100_BIN2' | ||
union all select 1254, 0x00000443, N'Uzbek_Latin_100_BIN2' | ||
), | ||
cte_cp1255 (cp, lcid, collation) as ( | ||
select 1255, 0x0000040d, N'Hebrew_100_BIN2' | ||
), | ||
cte_cp1256 (cp, lcid, collation) as ( | ||
select 1256, 0x00000401, N'Arabic_100_BIN2' | ||
union all select 1256, 0x00000429, N'Persian_100_BIN2' | ||
union all select 1256, 0x00000420, N'Urdu_100_BIN2' | ||
union all select 1256, 0x00000480, N'Uighur_100_BIN2' | ||
union all select 1256, 0x0000048C, N'Dari_100_BIN2' | ||
), | ||
cte_cp1257 (cp, lcid, collation) as ( | ||
select 1257, 0x00000425, N'Estonian_100_BIN2' | ||
union all select 1257, 0x00000426, N'Latvian_100_BIN2' | ||
union all select 1257, 0x00000427, N'Lithuanian_100_BIN2' | ||
), | ||
cte_cp1258 (cp, lcid, collation) as ( | ||
select 1258, 0x0000042a, N'Vietnamese_100_BIN2' | ||
), | ||
cte_cp_non1252 (cp, lcid, collation) as ( | ||
select cp, lcid, collation from cte_cp874 | ||
union all select cp, lcid, collation from cte_cp932 | ||
union all select cp, lcid, collation from cte_cp936 | ||
union all select cp, lcid, collation from cte_cp949 | ||
union all select cp, lcid, collation from cte_cp950 | ||
union all select cp, lcid, collation from cte_cp1250 | ||
union all select cp, lcid, collation from cte_cp1251 | ||
union all select cp, lcid, collation from cte_cp1253 | ||
union all select cp, lcid, collation from cte_cp1254 | ||
union all select cp, lcid, collation from cte_cp1255 | ||
union all select cp, lcid, collation from cte_cp1256 | ||
union all select cp, lcid, collation from cte_cp1257 | ||
union all select cp, lcid, collation from cte_cp1258 | ||
), | ||
cte_cp1252 (cp, lcid, collation) as ( | ||
select distinct | ||
-- TEST INTEGRITY ASSERTION: | ||
-- If there's any code page that is not 1252 - cause a failure. | ||
-- Use "divide by zero" as a distinctive error for this failure point. | ||
iif(collationproperty(name, 'codepage') = 1252, 1252, 1/0) | ||
, cast(collationproperty(name, 'lcid') as binary(4)) | ||
-- Doesn't matter which collation to pick as long as it's the only one for the given codepage/lcid combo. | ||
, max (name) over (partition by collationproperty(name, 'codepage'), collationproperty(name, 'lcid')) | ||
from fn_helpcollations() hc | ||
where | ||
collationproperty(name, 'codepage') not in (0, 65001) | ||
and collationproperty(name, 'sortid') = 0 | ||
and not exists ( | ||
select * from cte_cp_non1252 | ||
where | ||
cp = collationproperty(hc.name, 'codepage') | ||
and lcid = cast(collationproperty(hc.name, 'lcid') as binary(4))) | ||
), | ||
cte_cp_all (cp, lcid, collation) as ( | ||
select cp, lcid, collation from cte_cp_non1252 | ||
union all select cp, lcid, collation from cte_cp1252 | ||
), | ||
cte_sqltext (cp, lcid, collation, sqltext) as ( | ||
select | ||
cte_cp_all.cp | ||
, cte_cp_all.lcid | ||
, cte_cp_all.collation | ||
, N'select' + char(13) + char(10) + | ||
N' N''' + cte_data.datasample + N''' as reference_data' + nchar(13) + nchar(10) + | ||
N', cast(N''' + cte_data.datasample + N''' collate ' + cte_cp_all.collation + N' as varchar(1000)) as codepage_data' | ||
from | ||
cte_cp_all left join cte_data on (cte_cp_all.cp = cte_data.cp) | ||
) | ||
select cp, lcid, collation, sqltext from cte_sqltext | ||
union all | ||
select | ||
-- TEST INTEGRITY ASSERTION: | ||
-- Check if all codepages have a sample data associated with them. | ||
-- The "sqltext" property will be set to NULL for those that do not. | ||
-- Cause a failure if found. | ||
-- Use "arithmetic overflow" as a distinctive error for this failure point | ||
-- by casting the code page value (that is greater than 255) to tinyint. | ||
cast(cp as tinyint), null, null, null | ||
from cte_sqltext | ||
where sqltext is null | ||
union all | ||
select | ||
-- TEST INTEGRITY ASSERTION: | ||
-- Check for "orphan" codepage/lcid combos that are present in SQL server | ||
-- but not covered by the above CTEs. Exclude: | ||
-- - SQL collations (the ones whose SortId is nonzero) | ||
-- - Unicode-only collations (the ones that do not have a code page) | ||
-- - UTF-8 collations - those are orthogonal to LCIDs and don't need to be tested. | ||
-- If found such orphan combos - cause a failure. | ||
-- Use "invalid cast" as a distinctive error for this failure point by | ||
-- casting collation name (that is guaranteed to not be a valid number) to a number. | ||
cast(name as int), null, null, null | ||
from fn_helpcollations() hc | ||
where | ||
collationproperty(name, 'codepage') not in (0, 65001) | ||
and collationproperty(name, 'sortid') = 0 | ||
and not exists ( | ||
select * from cte_cp_all where | ||
cast(collationproperty(hc.name, 'lcid') as binary(4)) = cte_cp_all.lcid | ||
and collationproperty(hc.name, 'codepage') = cte_cp_all.cp | ||
) | ||
` | ||
|
||
// Represents codepage/LCID pair | ||
type CpLcid struct { | ||
cp int | ||
lcid int32 | ||
} | ||
|
||
// Represents a collation / comparison SQL text data | ||
// for each given codepage/LCID pair. | ||
type CpLcidComparisonData struct { | ||
collation string | ||
sqltext string | ||
} | ||
|
||
// Type alias for the mapping of codepage/LCID pair | ||
// to its collation/sqltext data. | ||
type CpLcidComparisonMap map[CpLcid]CpLcidComparisonData | ||
|
||
// Builds a map of LCID fetching queries for all codepage/LCID pairs. | ||
func buildLcidFetchComparisonMap(conn *sql.DB, t *testing.T) CpLcidComparisonMap { | ||
stmt, err := conn.Prepare(comparisonQueriesGeneratorSQL) | ||
if err != nil { | ||
t.Error("Unable to run comparison queries generator query", err.Error()) | ||
} | ||
defer stmt.Close() | ||
|
||
rows, err := stmt.Query() | ||
if err != nil { | ||
t.Error("Query failed:", err.Error()) | ||
} | ||
defer rows.Close() | ||
|
||
result := make(CpLcidComparisonMap) | ||
|
||
for rows.Next() { | ||
var codepage int | ||
var lcidRaw []byte = make([]byte, 4) | ||
var collation string | ||
var sqltext string | ||
|
||
err := rows.Scan(&codepage, &lcidRaw, &collation, &sqltext) | ||
if err != nil { | ||
t.Error("Failed to fetch the comparison SQL text row:", err.Error()) | ||
} | ||
|
||
var lcid int32 | ||
err = binary.Read(bytes.NewReader(lcidRaw), binary.BigEndian, &lcid) | ||
if err != nil { | ||
t.Error("Failed to convert LCID from binary to int:", err.Error()) | ||
} | ||
|
||
cplcid := CpLcid{codepage, lcid} | ||
cplciddata := CpLcidComparisonData{collation, sqltext} | ||
|
||
result[cplcid] = cplciddata | ||
} | ||
|
||
err = rows.Err() | ||
if err != nil { | ||
t.Error("Rows containing comparison queries have errors", err) | ||
} | ||
|
||
return result | ||
} | ||
|
||
// Verifies a specific LCID fetch by comparing it to its reference data. | ||
func verifyLcidFetch(conn *sql.DB, sqltext *string, t *testing.T) bool { | ||
var refdata string | ||
var cpdata string | ||
|
||
err := conn.QueryRow(*sqltext).Scan(&refdata, &cpdata) | ||
if err != nil { | ||
t.Error("Cannot scan reference and codepage data", err) | ||
} | ||
|
||
return refdata == cpdata | ||
} | ||
|
||
// Tests the fetching of all available LCIDs to verify that they | ||
// are being correctly mapped to their respective Windows code pages. | ||
func TestLcidsFetching(t *testing.T) { | ||
conn, _ := sql.Open("sqlserver", makeConnStr(t).String()) | ||
defer conn.Close() | ||
|
||
cplcidmap := buildLcidFetchComparisonMap(conn, t) | ||
|
||
success := true | ||
for cplcid, cplciddata := range cplcidmap { | ||
if !verifyLcidFetch(conn, &cplciddata.sqltext, t) { | ||
success = false | ||
t.Logf("LCID fetch failed for codepage %d, lcid 0x%x, collation %s", | ||
cplcid.cp, cplcid.lcid, cplciddata.collation) | ||
} | ||
} | ||
|
||
if !success { | ||
t.Error("There are failed LCID fetches. See test log for the details.") | ||
} | ||
} |