#pragma once #include #include #include "types.hh" class sqlite3; class sqlite3_stmt; namespace nix { /* RAII wrapper to close a SQLite database automatically. */ struct SQLite { sqlite3 * db; SQLite() { db = 0; } ~SQLite(); operator sqlite3 * () { return db; } }; /* RAII wrapper to create and destroy SQLite prepared statements. */ struct SQLiteStmt { sqlite3 * db = 0; sqlite3_stmt * stmt = 0; SQLiteStmt() { } void create(sqlite3 * db, const std::string & s); ~SQLiteStmt(); operator sqlite3_stmt * () { return stmt; } /* Helper for binding / executing statements. */ class Use { friend struct SQLiteStmt; private: SQLiteStmt & stmt; unsigned int curArg = 1; Use(SQLiteStmt & stmt); public: ~Use(); /* Bind the next parameter. */ Use & operator () (const std::string & value, bool notNull = true); Use & operator () (int64_t value, bool notNull = true); Use & bind(); // null int step(); /* Execute a statement that does not return rows. */ void exec(); /* For statements that return 0 or more rows. Returns true iff a row is available. */ bool next(); std::string getStr(int col); int64_t getInt(int col); }; Use use() { return Use(*this); } }; /* RAII helper that ensures transactions are aborted unless explicitly committed. */ struct SQLiteTxn { bool active = false; sqlite3 * db; SQLiteTxn(sqlite3 * db); void commit(); ~SQLiteTxn(); }; MakeError(SQLiteError, Error); MakeError(SQLiteBusy, SQLiteError); [[noreturn]] void throwSQLiteError(sqlite3 * db, const format & f); /* Convenience function for retrying a SQLite transaction when the database is busy. */ template T retrySQLite(std::function fun) { while (true) { try { return fun(); } catch (SQLiteBusy & e) { } } } } form>
path: root/gnu/packages/bdw-gc.scm
AgeCommit message (Expand)Author
2023-02-25gnu: libgc: Define properties for the 'generic-html' updater....Ludovic Courtès
2022-08-29Revert "gnu: libatomic-ops: Fix test suite on riscv64-linux."...Efraim Flashner
2022-08-28Merge branch 'master' into stagingMarius Bakke
2022-08-28gnu: libatomic-ops: Fix test suite on riscv64-linux....Efraim Flashner
2022-07-06gnu: libatomic-ops: Update to 7.6.12....Efraim Flashner