Enhance interpolateParams to correctly handle placeholders #1732
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""" WalkthroughA new state-machine-based function was introduced to accurately find parameter placeholders in SQL queries, ignoring those inside comments, strings, and backticks. The parameter interpolation logic was updated to use this function and refactored to handle argument escaping with a simplified flag. Corresponding tests were updated to verify correct handling of placeholders in various SQL contexts including comments and backticks. Changes
Sequence Diagram(s)sequenceDiagram
participant Client
participant mysqlConn
Client->>mysqlConn: interpolateParams(query, args)
mysqlConn->>mysqlConn: parse query with state machine to find real placeholders
mysqlConn->>mysqlConn: interpolate arguments only at valid placeholders
mysqlConn-->>Client: return interpolated query or error
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🧰 Additional context used🧠 Learnings (4)📓 Common learningsutils_test.go (2)connection.go (3)utils.go (1)🧬 Code Graph Analysis (1)connection_test.go (1)
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🔇 Additional comments (14)
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Actionable comments posted: 1
🧹 Nitpick comments (3)
connection.go (2)
248-271: Consider using idiomatic Go constant definitions.The byte constants use runtime conversions and non-standard naming. Consider defining them as proper constants:
-var ( - QUOTE_BYTE = byte('\'') - DBL_QUOTE_BYTE = byte('"') - BACKSLASH_BYTE = byte('\\') - QUESTION_MARK_BYTE = byte('?') - SLASH_BYTE = byte('/') - STAR_BYTE = byte('*') - HASH_BYTE = byte('#') - MINUS_BYTE = byte('-') - LINE_FEED_BYTE = byte('\n') - RADICAL_BYTE = byte('`') -) +const ( + quoteByte = '\'' + dblQuoteByte = '"' + backslashByte = '\\' + questionMarkByte = '?' + slashByte = '/' + starByte = '*' + hashByte = '#' + minusByte = '-' + lineFeedByte = '\n' + backtickByte = '`' +)
272-274: Simplify slice initialization.The slice initialization can be simplified for better readability:
-paramPositions := make([]int, 0) +var paramPositions []intconnection_test.go (1)
206-214: Consider adding edge case test coverage.While the current test cases are comprehensive, consider adding tests for additional edge cases:
// Escaped quotes in strings {"SELECT 'don\\'t', ?", []driver.Value{int64(42)}, "SELECT 'don\\'t', 42", false}, // Double-quoted strings {"SELECT \"?\", ?", []driver.Value{int64(42)}, "SELECT \"?\", 42", false}, // Nested quotes {"SELECT \"It's a string\", ?", []driver.Value{int64(42)}, "SELECT \"It's a string\", 42", false}, // Comment without newline at end {"SELECT ? -- comment", []driver.Value{int64(42)}, "SELECT 42 -- comment", false},
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📒 Files selected for processing (2)
connection.go(5 hunks)connection_test.go(1 hunks)
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🧠 Learnings (2)
📓 Common learnings
Learnt from: shogo82148
PR: go-sql-driver/mysql#1576
File: CHANGELOG.md:1-6
Timestamp: 2024-07-26T20:55:56.049Z
Learning: PRs #1562 and #1570 in the go-sql-driver/mysql repository collectively address the same underlying issue related to fixing a race condition when a context is canceled, as documented in the CHANGELOG.md for version 1.8.1.
connection.go (1)
Learnt from: shogo82148
PR: go-sql-driver/mysql#1576
File: CHANGELOG.md:1-6
Timestamp: 2024-07-26T20:55:56.049Z
Learning: PRs #1562 and #1570 in the go-sql-driver/mysql repository collectively address the same underlying issue related to fixing a race condition when a context is canceled, as documented in the CHANGELOG.md for version 1.8.1.
🧬 Code Graph Analysis (1)
connection_test.go (1)
dsn.go (1)
Config(37-84)
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🔇 Additional comments (5)
connection.go (4)
248-341: Excellent state machine implementation for SQL parsing.The
findParamPositionsfunction implements a comprehensive state machine that correctly handles various SQL contexts including comments (--,#,/* */), string literals, backticks, and escape sequences. The logic properly tracks state transitions and accurately identifies real parameter placeholders while ignoring those inside comments or strings.The handling of the
noBackslashEscapesflag is particularly well done, respecting MySQL's SQL mode settings.
344-348: Improved parameter counting logic.The change from simple character counting to using
findParamPositionsis a significant improvement. The function now correctly validates that the number of real parameters matches the number of arguments before attempting interpolation.
400-404: Simplified and consistent escaping logic.The refactored escaping logic using the
noBackslashEscapesflag is cleaner and more consistent. The conditional logic is now easier to understand and maintain across different data types (JSON, bytes, strings).Also applies to: 411-415, 420-424
362-435: Correct implementation of position-based parameter replacement.The new interpolation loop correctly processes parameters based on their actual positions in the query rather than simple sequential replacement. The
lastIdxtracking ensures that query segments are properly appended between parameter substitutions.connection_test.go (1)
190-236: Comprehensive test coverage for enhanced parameter interpolation.The
TestInterpolateParamsWithCommentstest provides excellent coverage of the new parameter parsing logic. It correctly tests:
- Single-line comments with
--and#- Multi-line comments with
/* */- String literals with single quotes
- Backtick identifiers
- Complex queries with multiple comment types
- Error cases where parameter count doesn't match argument count
The test case on line 216 correctly expects
driver.ErrSkipbecause there are 4 real placeholders but only 3 arguments provided.
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Please run BenchmarkInterpolation and write the results. Is this algorithm identical to the MySQL or MariaDB? And are there examples of this algorithm implemented in other database drivers? |
…s with comments, strings, and backticks. * Add `findParamPositions` to identify real parameter positions * Update and expand related tests.
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force push implementation with performance improvement. current implementation : initial proposal: new proposal: There is only one loop now, and escaping methods for parameters have been improved. about other driver using that :
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Enhance client side statement to correctly handle placeholders in queries with comments, strings, and backticks.
Add findParamPositions to identify real parameter positions
Update and expand related tests.