#pragma once

#include <functional>
#include <string>

#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<typename T>
T retrySQLite(std::function<T()> fun)
{
    while (true) {
        try {
            return fun();
        } catch (SQLiteBusy & e) {
        }
    }
}

}
le>
<div class='path'>path: <a href='/guix/log/?id=7d57bc4d0d8b34409d795fbbff079eff3486a50d'>root</a>/<a href='/guix/log/gnu?id=7d57bc4d0d8b34409d795fbbff079eff3486a50d'>gnu</a>/<a href='/guix/log/gnu/packages?id=7d57bc4d0d8b34409d795fbbff079eff3486a50d'>packages</a>/<a href='/guix/log/gnu/packages/nfs.scm?id=7d57bc4d0d8b34409d795fbbff079eff3486a50d'>nfs.scm</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/gnu/packages/nfs.scm?id=7d57bc4d0d8b34409d795fbbff079eff3486a50d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-01-16 16:08:22 +0100'>2019-01-16</span></td><td><a href='/guix/commit/gnu/packages/nfs.scm?id=cd0322a3efd96577de9ab35e4432d1ae399257c8'>gnu: Move sqlite to separate module.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2018-11-10 22:36:33 +0200'>2018-11-10</span></td><td><a href='/guix/commit/gnu/packages/nfs.scm?id=1a392ee7aed74e345f5263063fdde9a739082af4'>gnu: nfs-utils: Fix building with glibc@2.28.</a><span class='msg-avail'>...</span></td><td>Efraim Flashner</td></tr>
<tr><td><span title='2018-01-10 00:07:40 -0800'>2018-01-10</span></td><td><a href='/guix/commit/gnu/packages/nfs.scm?id=606e2468610798b4b141c2812ff1516b83fcd2ef'>gnu: nfs-utils: Adapt to changes in glibc 2.26.</a><span class='msg-avail'>...</span></td><td>Leo Famulari</td></tr>