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sqlite.cc: Add SQL tracing

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Set environment variable NIX_DEBUG_SQLITE_TRACES=1 to log all sql statements.

(cherry picked from commit 8a0ef5d58e)
This commit is contained in:
Robert Hensing 2023-01-17 19:53:21 +01:00
parent b7166df536
commit 54ac8fa919
1 changed files with 14 additions and 0 deletions
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14
src/libstore/sqlite.cc
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@ -36,6 +36,15 @@ SQLiteError::SQLiteError(const char *path, int errNo, int extendedErrNo, hintfor
throw SQLiteError(path, err, exterr, std::move(hf)); throw SQLiteError(path, err, exterr, std::move(hf));
} }
static void traceSQL(void * x, const char * sql)
{
// wacky delimiters:
// so that we're quite unambiguous without escaping anything
// notice instead of trace:
// so that this can be enabled without getting the firehose in our face.
notice("SQL<[%1%]>", sql);
};
SQLite::SQLite(const Path & path, bool create) SQLite::SQLite(const Path & path, bool create)
{ {
// useSQLiteWAL also indicates what virtual file system we need. Using // useSQLiteWAL also indicates what virtual file system we need. Using
@ -49,6 +58,11 @@ SQLite::SQLite(const Path & path, bool create)
if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK) if (sqlite3_busy_timeout(db, 60 * 60 * 1000) != SQLITE_OK)
SQLiteError::throw_(db, "setting timeout"); SQLiteError::throw_(db, "setting timeout");
if (getEnv("NIX_DEBUG_SQLITE_TRACES") == "1") {
// To debug sqlite statements; trace all of them
sqlite3_trace(db, &traceSQL, nullptr);
}
exec("pragma foreign_keys = 1"); exec("pragma foreign_keys = 1");
} }