[release/10.0] Fix GO batch separator not recognized in comments and escaped identifiers #37521

Copilot · 2026-01-16T00:12:15Z

Description

EF Core splits SQL Server migration scripts into batches on lines starting with GO. To avoid splitting inside string literals, SqlServerMigrationsSqlGenerator tracks whether it is inside a quoted string using a quoted boolean that toggles on single quotes ('). This quote-tracking logic was introduced in #34917.

The implementation does not handle:

Standard SQL block comments (/* ... */) - if a block comment contains a single quote, the quoted state is incorrectly toggled even though the quote is inside a comment
Escaped identifiers using square brackets ([GO]) or double quotes ("GO")

Since there is no matching closing quote in block comments, quoted remains true across subsequent lines. As a result, a later GO line is not recognized as a batch separator and is sent to SQL Server as literal text, causing:

Microsoft.Data.SqlClient.SqlException: Incorrect syntax near 'go'.

This commonly occurs in stored procedure scripts where a header block comment contains a ' character above a CREATE PROCEDURE statement, or when using GO as a table/column name in escaped identifiers.

Customer impact

Customers using SQL migrations with:

Stored procedures or other SQL scripts that include block comments containing single quotes will experience migration failures with "Incorrect syntax near 'go'" errors (e.g., contractions like "It's" or possessives like "user's")
Table or column names that are GO using escaped identifiers like [GO] or "GO" will incorrectly have batch separators inserted

Workarounds:

Remove single quotes from block comments
Use two single quotes in block comments to escape them
Avoid using GO as an identifier name

How found

Customer reported on 10.0.1

Regression

Yes, from EF Core 9.0. Introduced in #34917.

Testing

Added 31 tests covering:

Block comments with single quotes (single-line and multi-line)
Line comments with block comment markers
Empty block comments
Block comments with line comments inside
Escaped identifiers with square brackets [GO] and double quotes "GO"
Escaped closing brackets in identifiers [g]]o]
Escaped double quotes in identifiers "go""lum"
Multi-line escaped identifiers spanning newlines with go text inside (e.g., INSERT INTO "\ngo\n" VALUES (1))
All character combinations (quotes, slashes, asterisks, dashes, brackets) preceding GO
Line comments (--) inside quotes and escaped identifiers
Unclosed delimiters within block comments (e.g., /* [bracket */ - valid SQL since comments don't require matched delimiters)
Unclosed delimiters within line comments (e.g., -- [column - valid SQL since line comments end at EOL)
Single quotes inside block comments
All delimiter types inside line comments
Escaped quotes in strings ('test''s value')
Multiple delimiters in strings

Risk

Medium. The changes only affect custom SQL operations in migrations.

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- Add tracking for block comments (/* ... */) to prevent incorrect quote state toggling - Block comments can now contain single quotes without affecting GO batch separator recognition - Add comprehensive tests for various block comment scenarios - All tests pass successfully Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

Removed separate if statements and i++ increments. Block comment detection now integrated into the main switch statement, making the code cleaner and more maintainable. Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

Added test to verify that /* inside a line comment (-- /*) doesn't trigger block comment state and GO is still correctly recognized as a batch separator. Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

- Changed all GO to go in new test SQL strings (will still appear as GO in output) - Added test for multiline block comment with go on separate line to verify go inside block comments is correctly ignored Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

Refactored to use foreach instead of for loop with index by tracking blockCommentStart and blockCommentEnd flags to detect /* and */ patterns across iterations. Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

Copilot

Pull request overview

This PR fixes a bug in SQL Server migrations where GO batch separators were not recognized when block comments contained single quotes. The issue was introduced in EF Core 9.0 when quote-tracking logic was added, but it didn't account for block comments.

Changes:

Replaces simple boolean quote tracking with a state machine that properly handles SQL strings, line comments, and block comments
Adds comprehensive test coverage with 11 new test cases covering various comment and string scenarios

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs	Implements a state machine with 6 states (Normal, Quoted, InBlockComment, MaybeLineComment, MaybeBlockCommentStart, MaybeBlockCommentEnd) to correctly parse SQL and ignore quotes inside block comments
test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs	Adds 11 test cases covering block comments with quotes, multiline comments, empty comments, nested comments/strings, and edge cases like GO inside comments

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

…r.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

artl93

@roji - With this being medium risk (though customer reported regression), is there an obvious workaround for the issue?

AndriySvyryd · 2026-01-20T20:24:46Z

@artl93 The workarounds are straightforward once the root cause is discovered, but since the exception is very sparse on details: Microsoft.Data.SqlClient.SqlException: Incorrect syntax near 'go'., it's far from obvious.
The reason this is medium risk is because the fix entails changes to a parser, so all the possible consequences aren't as clear.

artl93 · 2026-01-20T20:28:46Z

How can we reduce risk around the parser?

AndriySvyryd · 2026-01-20T20:30:59Z

How can we reduce risk around the parser?

I've added 11 new test cases. We could keep adding more

artl93

Obviously, we want to avoid regression. The more we can add, the better, but otherwise, approved.

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

AndriySvyryd · 2026-01-21T17:40:11Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+SELECT 2;
+""");
+    }
+


@copilot Make sure there are tests for all combinations of the characters handled by the switch, preceding a go on a new line

Done in ee931ae. Added 9 tests covering all character types (quotes, forward slash, asterisk, dash, square brackets, double quotes) preceding GO on a new line.

@copilot Also add tests for

-- inside quotes and delimited identifiers

brackets and double quotes inside block comments

quotes, brackets and double quotes in line comments

any other valid SQL using one of the handled characters in a way that's not covered by the other tests

Done in df1b23e. Added 11 tests covering: line comments inside quotes/brackets/double quotes, brackets/quotes inside block comments, all delimiter types inside line comments, escaped quotes in strings, and multiple delimiters in strings.

…upport - Changed from foreach to for loop with look-ahead to eliminate Maybe* states - Simplified enum from 6 states to 5: Normal, Quoted, InBlockComment, InSquareBrackets, InDoubleQuotes - Added support for escaped identifiers: [go] and "go" - Added support for escaped closing brackets: [g]]o] - Changed switch statement to switch expression for cleaner code - Removed state reset logic (no longer needed without Maybe* states) - Added 9 comprehensive tests for escaped identifiers and character combinations - All 26 tests pass Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

src/EFCore.SqlServer/Migrations/SqlServerMigrationsSqlGenerator.cs

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

AndriySvyryd · 2026-01-21T18:21:07Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+SELECT 2;
+""");
+    }
+


@copilot Also add tests for

-- inside quotes and delimited identifiers

brackets and double quotes inside block comments

quotes, brackets and double quotes in line comments

any other valid SQL using one of the handled characters in a way that's not covered by the other tests

AndriySvyryd · 2026-01-21T18:22:43Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_quote_before_go()
+    {
+        Generate(
+            new SqlOperation { Sql = "SELECT 'test';" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "SELECT 'test';" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "SELECT 'test\"';" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in df1b23e. Changed to include double quote inside single quoted string: 'test"'.

- Renamed ParsingState.Quoted to ParsingState.InQuotes and moved to end of enum - Enhanced tests to include EOL before/after go and escaped characters - Added 11 new comprehensive tests: - Line comments inside quotes, square brackets, and double quotes - Brackets and double quotes inside block comments - Single quotes inside block comments - All delimiter types inside line comments - Escaped quotes in strings ('test''s value') - Multiple delimiters in strings - Updated existing tests with better coverage (double quote escaping, EOL placement) - All 37 SqlOperation tests pass Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

AndriySvyryd · 2026-01-21T20:03:34Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_double_quote_identifier()
+    {
+        Generate(
+            new SqlOperation { Sql = "INSERT INTO \"go\" VALUES (1);" + EOL + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "INSERT INTO \"go\" VALUES (1);" + EOL + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "INSERT INTO \"" + EOL + "go" + EOL + "\" VALUES (1);" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test multi-line double quote identifier with go inside: INSERT INTO "\ngo\n" VALUES (1);

AndriySvyryd · 2026-01-21T20:04:26Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_square_bracket_before_go()
+    {
+        Generate(
+            new SqlOperation { Sql = "SELECT" + EOL + "[column]" + EOL + ";" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "SELECT" + EOL + "[column]" + EOL + ";" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "SELECT [" + EOL + "column" + EOL + "];" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test multi-line square bracket identifier: SELECT [\ncolumn\n];

AndriySvyryd · 2026-01-21T20:04:57Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_brackets_inside_block_comment()
+    {
+        Generate(
+            new SqlOperation { Sql = "/* [bracket] identifier */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "/* [bracket] identifier */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "/* [bracket identifier */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test unclosed bracket in block comment: /* [bracket identifier */

AndriySvyryd · 2026-01-21T20:05:19Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_double_quotes_inside_block_comment()
+    {
+        Generate(
+            new SqlOperation { Sql = "/* \"double\" quote */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "/* \"double\" quote */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "/* \"double quote */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test unclosed double quote in block comment: /* "double quote */

AndriySvyryd · 2026-01-21T20:08:38Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_brackets_inside_line_comment()
+    {
+        Generate(
+            new SqlOperation { Sql = "-- [column]" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "-- [column]" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "-- [column" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test unclosed bracket in line comment: -- [column

AndriySvyryd · 2026-01-21T20:09:09Z

test/EFCore.SqlServer.FunctionalTests/Migrations/SqlServerMigrationsSqlGeneratorTest.cs

+    public virtual void SqlOperation_handles_double_quotes_inside_line_comment()
+    {
+        Generate(
+            new SqlOperation { Sql = "-- \"column\"" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });


@copilot

Suggested change

new SqlOperation { Sql = "-- \"column\"" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

new SqlOperation { Sql = "-- \"column" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

and adjust the assert

Done in 600e334. Changed to test unclosed double quote in line comment: -- "column

- Changed double quote identifier test to include newlines within the identifier (double quote spans multiple lines with go inside) - Changed square bracket test to include newlines within the identifier (bracket spans multiple lines with column inside) - Changed block comment tests to show unclosed brackets/quotes (removed closing bracket/quote to test edge cases) - Changed line comment tests to show unclosed brackets/quotes (line comments end at EOL, so bracket/quote is not closed) - These changes test that the parser correctly handles: - Multi-line escaped identifiers with go inside - Unclosed delimiters in comments (which are valid SQL since comments don't need matched delimiters) Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

roji

Thanks for making the changes, this is now easier to follow and I can't think of any problems.

Initial plan

89d67fe

Copilot AI assigned Copilot and AndriySvyryd Jan 16, 2026

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Copilot AI changed the title ~~[WIP] Fix GO batch separator recognition for block comments~~ Fix GO batch separator not recognized when block comment contains single quote Jan 16, 2026

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Change back to foreach for character iteration

da14de3

Refactored to use foreach instead of for loop with index by tracking blockCommentStart and blockCommentEnd flags to detect /* and */ patterns across iterations. Co-authored-by: AndriySvyryd <6539701+AndriySvyryd@users.noreply.github.com>

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00e6305

…r.cs Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

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	new SqlOperation { Sql = "SELECT 'test';" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "SELECT 'test\"';" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "INSERT INTO \"go\" VALUES (1);" + EOL + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "INSERT INTO \"" + EOL + "go" + EOL + "\" VALUES (1);" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "SELECT" + EOL + "[column]" + EOL + ";" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "SELECT [" + EOL + "column" + EOL + "];" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "/* [bracket] identifier */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "/* [bracket identifier */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "/* \"double\" quote */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "/* \"double quote */" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "-- [column]" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "-- [column" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

	new SqlOperation { Sql = "-- \"column\"" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });
	new SqlOperation { Sql = "-- \"column" + EOL + "SELECT 1;" + EOL + "go" + EOL + "SELECT 2;" });

[release/10.0] Fix GO batch separator not recognized in comments and escaped identifiers #37521

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[release/10.0] Fix GO batch separator not recognized in comments and escaped identifiers #37521

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Copilot AI commented Jan 16, 2026 •

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