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const std = @import("std");
const sqlite = @import("sqlite");
pub const Database = struct {
handle: *sqlite.sqlite3,
pub const Error = set: {
var set: type = error{};
for (std.meta.fieldNames(Result.Primary)) |name| {
set = set || @TypeOf(@field(anyerror, name));
}
for (std.meta.fieldNames(Result.Extended)) |name| {
set = set || @TypeOf(@field(anyerror, name));
}
break :set set;
};
pub const Kind = union(enum) {
temp_in_memory,
temp_on_disk,
path: []const u8,
};
pub const Query = struct {
handle: *sqlite.sqlite3_stmt,
// https://sqlite.org/c3ref/finalize.html
pub fn deinit(self: *Query) void {
const result: Result = .from(sqlite.sqlite3_finalize(self.handle));
// TODO: maybe don't panic?
if (!result.isOk()) @panic("Last error was " ++ @errorName(result.asError()));
self.* = undefined;
}
};
// Source: https://sqlite.org/c3ref/open.html
pub fn init(kind: Kind) Error!Database {
const name = switch (kind) {
.temp_in_memory => ":memory:",
.temp_on_disk => "",
.path => |path| path,
};
var handle: ?*sqlite.sqlite3 = null;
const result: Result = .from(sqlite.sqlite3_open(name.ptr, &handle));
return if (result.isOk()) .{ .handle = handle.? } else result.asError(handle);
}
// https://sqlite.org/c3ref/close.html
pub fn deinit(self: *Database) void {
const result: Result = .from(sqlite.sqlite3_close(self.handle));
// TODO: check if we can loop over the unfinalised objects and commit them
if (!result.isOk()) @panic("There are still unfinalised objects");
self.* = undefined;
}
// https://sqlite.org/c3ref/prepare.html
pub fn query(self: *Database, statement: []const u8) Error!Query {
var handle: ?*sqlite.sqlite3_stmt = null;
var unused: [*c]const u8 = null;
const length: c_int = @truncate(@as(isize, @intCast(statement.len)));
const result: Result = .from(sqlite.sqlite3_prepare_v2(self.handle, statement.ptr, length, &handle, &unused));
return if (result.isOk()) .{ .handle = handle.? } else result.asError(self.handle);
}
};
// Source: https://sqlite.org/rescode.html
const Result = enum(i32) {
_,
// zig fmt: off
const Primary = enum(u8) {
ok = 0,
@"error" = 1,
internal = 2,
perm = 3,
abort = 4,
busy = 5,
locked = 6,
nomem = 7,
readonly = 8,
interrupt = 9,
ioerr = 10,
corrupt = 11,
notfound = 12,
full = 13,
cantopen = 14,
protocol = 15,
empty = 16,
schema = 17,
toobig = 18,
constraint = 19,
mismatch = 20,
misuse = 21,
nolfs = 22,
auth = 23,
format = 24,
range = 25,
notadb = 26,
notice = 27,
warning = 28,
row = 100,
done = 101,
fn as(self: Primary, comptime T: type) T {
return @as(T, @intFromEnum(self));
}
};
// zig fmt: off
const Extended = enum(i32) {
error_missing_collseq = (Primary.@"error".as(i32) | ( 1 << 8)),
error_retry = (Primary.@"error".as(i32) | ( 2 << 8)),
error_snapshot = (Primary.@"error".as(i32) | ( 3 << 8)),
error_reservesize = (Primary.@"error".as(i32) | ( 4 << 8)),
error_key = (Primary.@"error".as(i32) | ( 5 << 8)),
error_unable = (Primary.@"error".as(i32) | ( 6 << 8)),
ioerr_read = (Primary.ioerr.as(i32) | ( 1 << 8)),
ioerr_short_read = (Primary.ioerr.as(i32) | ( 2 << 8)),
ioerr_write = (Primary.ioerr.as(i32) | ( 3 << 8)),
ioerr_fsync = (Primary.ioerr.as(i32) | ( 4 << 8)),
ioerr_dir_fsync = (Primary.ioerr.as(i32) | ( 5 << 8)),
ioerr_truncate = (Primary.ioerr.as(i32) | ( 6 << 8)),
ioerr_fstat = (Primary.ioerr.as(i32) | ( 7 << 8)),
ioerr_unlock = (Primary.ioerr.as(i32) | ( 8 << 8)),
ioerr_rdlock = (Primary.ioerr.as(i32) | ( 9 << 8)),
ioerr_delete = (Primary.ioerr.as(i32) | (10 << 8)),
ioerr_blocked = (Primary.ioerr.as(i32) | (11 << 8)),
ioerr_nomem = (Primary.ioerr.as(i32) | (12 << 8)),
ioerr_access = (Primary.ioerr.as(i32) | (13 << 8)),
ioerr_checkreservedlock = (Primary.ioerr.as(i32) | (14 << 8)),
ioerr_lock = (Primary.ioerr.as(i32) | (15 << 8)),
ioerr_close = (Primary.ioerr.as(i32) | (16 << 8)),
ioerr_dir_close = (Primary.ioerr.as(i32) | (17 << 8)),
ioerr_shmopen = (Primary.ioerr.as(i32) | (18 << 8)),
ioerr_shmsize = (Primary.ioerr.as(i32) | (19 << 8)),
ioerr_shmlock = (Primary.ioerr.as(i32) | (20 << 8)),
ioerr_shmmap = (Primary.ioerr.as(i32) | (21 << 8)),
ioerr_seek = (Primary.ioerr.as(i32) | (22 << 8)),
ioerr_delete_noent = (Primary.ioerr.as(i32) | (23 << 8)),
ioerr_mmap = (Primary.ioerr.as(i32) | (24 << 8)),
ioerr_gettemppath = (Primary.ioerr.as(i32) | (25 << 8)),
ioerr_convpath = (Primary.ioerr.as(i32) | (26 << 8)),
ioerr_vnode = (Primary.ioerr.as(i32) | (27 << 8)),
ioerr_auth = (Primary.ioerr.as(i32) | (28 << 8)),
ioerr_begin_atomic = (Primary.ioerr.as(i32) | (29 << 8)),
ioerr_commit_atomic = (Primary.ioerr.as(i32) | (30 << 8)),
ioerr_rollback_atomic = (Primary.ioerr.as(i32) | (31 << 8)),
ioerr_data = (Primary.ioerr.as(i32) | (32 << 8)),
ioerr_corruptfs = (Primary.ioerr.as(i32) | (33 << 8)),
ioerr_in_page = (Primary.ioerr.as(i32) | (34 << 8)),
ioerr_badkey = (Primary.ioerr.as(i32) | (35 << 8)),
ioerr_codec = (Primary.ioerr.as(i32) | (36 << 8)),
locked_sharedcache = (Primary.locked.as(i32) | ( 1 << 8)),
locked_vtab = (Primary.locked.as(i32) | ( 2 << 8)),
busy_recovery = (Primary.busy.as(i32) | ( 1 << 8)),
busy_snapshot = (Primary.busy.as(i32) | ( 2 << 8)),
busy_timeout = (Primary.busy.as(i32) | ( 3 << 8)),
cantopen_notempdir = (Primary.cantopen.as(i32) | ( 1 << 8)),
cantopen_isdir = (Primary.cantopen.as(i32) | ( 2 << 8)),
cantopen_fullpath = (Primary.cantopen.as(i32) | ( 3 << 8)),
cantopen_convpath = (Primary.cantopen.as(i32) | ( 4 << 8)),
cantopen_symlink = (Primary.cantopen.as(i32) | ( 6 << 8)),
corrupt_vtab = (Primary.corrupt.as(i32) | ( 1 << 8)),
corrupt_sequence = (Primary.corrupt.as(i32) | ( 2 << 8)),
corrupt_index = (Primary.corrupt.as(i32) | ( 3 << 8)),
readonly_recovery = (Primary.readonly.as(i32) | ( 1 << 8)),
readonly_cantlock = (Primary.readonly.as(i32) | ( 2 << 8)),
readonly_rollback = (Primary.readonly.as(i32) | ( 3 << 8)),
readonly_dbmoved = (Primary.readonly.as(i32) | ( 4 << 8)),
readonly_cantinit = (Primary.readonly.as(i32) | ( 5 << 8)),
readonly_directory = (Primary.readonly.as(i32) | ( 6 << 8)),
abort_rollback = (Primary.abort.as(i32) | ( 2 << 8)),
constraint_check = (Primary.constraint.as(i32) | ( 1 << 8)),
constraint_commithook = (Primary.constraint.as(i32) | ( 2 << 8)),
constraint_foreignkey = (Primary.constraint.as(i32) | ( 3 << 8)),
constraint_function = (Primary.constraint.as(i32) | ( 4 << 8)),
constraint_notnull = (Primary.constraint.as(i32) | ( 5 << 8)),
constraint_primarykey = (Primary.constraint.as(i32) | ( 6 << 8)),
constraint_trigger = (Primary.constraint.as(i32) | ( 7 << 8)),
constraint_unique = (Primary.constraint.as(i32) | ( 8 << 8)),
constraint_vtab = (Primary.constraint.as(i32) | ( 9 << 8)),
constraint_rowid = (Primary.constraint.as(i32) | (10 << 8)),
constraint_pinned = (Primary.constraint.as(i32) | (11 << 8)),
constraint_datatype = (Primary.constraint.as(i32) | (12 << 8)),
notice_recover_wal = (Primary.notice.as(i32) | ( 1 << 8)),
notice_recover_rollback = (Primary.notice.as(i32) | ( 2 << 8)),
notice_rbu = (Primary.notice.as(i32) | ( 3 << 8)),
warning_autoindex = (Primary.warning.as(i32) | ( 1 << 8)),
auth_user = (Primary.auth.as(i32) | ( 1 << 8)),
ok_load_permanently = (Primary.ok.as(i32) | ( 1 << 8)),
};
fn from(value: anytype) Result {
return @enumFromInt(value);
}
fn isOk(self: Result) bool {
return if (self.asPrimary() == .ok) true else false;
}
fn asError(self: Result, handle: ?*sqlite.sqlite3) Database.Error {
const result: Result = .from(sqlite.sqlite3_extended_errcode(handle));
const primary = self.asPrimary();
if (self == result) switch (primary) {
inline else => |code| return @field(Database.Error, @tagName(code)),
};
const extended: Extended = @enumFromInt(@intFromEnum(result));
return switch (extended) {
inline else => |code| @field(Database.Error, @tagName(code)),
};
}
fn asPrimary(self: Result) Primary {
return @enumFromInt(0x000000FF & @intFromEnum(self));
}
};
test {
var db: Database = try .init(.temp_in_memory);
// defer db.deinit();
const query = db.query(
\\ CREATE TABLE contacts (
\\ contact_id INTEGER PRIMARY KEY,
\\ first_name TEXT NOT NULL,
\\ last_name TEXT NOT NULL,
\\ email TEXT NOT NULL UNIQUE,
\\ phone TEXT NOT NULL UNIQUE
\\ );
);
std.debug.print("{any}\n", .{ query });
}
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