fediglam/src/sql/lib.zig

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const std = @import("std");
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const util = @import("util");
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const c = @cImport({
@cInclude("sqlite3.h");
});
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const Uuid = util.Uuid;
const DateTime = util.DateTime;
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pub const Sqlite = struct {
db: *c.sqlite3,
pub fn open(path: [:0]const u8) !Sqlite {
var db: ?*c.sqlite3 = undefined;
const err = c.sqlite3_open_v2(path, &db, c.SQLITE_OPEN_READWRITE | c.SQLITE_OPEN_CREATE, null);
if (err != c.SQLITE_OK) return error.UnknownError;
return Sqlite{
.db = db.?,
};
}
pub fn close(self: *Sqlite) void {
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_ = c.sqlite3_close_v2(self.db);
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}
pub fn prepare(self: *Sqlite, sql: []const u8) !PreparedStmt {
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var stmt: ?*c.sqlite3_stmt = undefined;
const err = c.sqlite3_prepare_v2(self.db, sql.ptr, @intCast(c_int, sql.len), &stmt, null);
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if (err != c.SQLITE_OK) {
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std.log.debug("sql error {}: {s}", .{ err, c.sqlite3_errmsg(self.db) });
std.log.debug("Failed on SQL:\n==========\n{s}\n==========", .{sql});
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return error.UnknownError;
}
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return PreparedStmt{ .stmt = stmt.?, .db = self.db };
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}
};
pub const Row = struct {
stmt: *c.sqlite3_stmt,
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db: *c.sqlite3,
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pub fn getI64(self: Row, idx: u15) !i64 {
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return @intCast(i64, c.sqlite3_column_int64(self.stmt, idx));
}
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pub fn getText(self: Row, idx: u15, buf: []u8) ![]u8 {
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const ptr = c.sqlite3_column_text(self.stmt, idx);
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const size = @intCast(usize, c.sqlite3_column_bytes(self.stmt, idx));
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if (size > buf.len) return error.StreamTooLong;
for (ptr[0..size]) |ch, i| buf[i] = ch;
return buf[0..size];
}
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pub fn getTextAlloc(self: Row, idx: u15, alloc: std.mem.Allocator) ![]u8 {
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const size = c.sqlite3_column_bytes(self.stmt, idx);
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var buf = try alloc.alloc(u8, @intCast(usize, size));
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errdefer alloc.free(buf);
return self.getText(idx, buf);
}
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pub fn getUuid(self: Row, idx: u15) !Uuid {
var buf: [Uuid.string_len + 1]u8 = undefined;
_ = try self.getText(idx, &buf);
return try Uuid.parse(buf[0..Uuid.string_len]);
}
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pub fn getDateTime(self: Row, idx: u15) !DateTime {
return DateTime{ .seconds_since_epoch = try self.getI64(idx) };
}
pub fn getAlloc(self: Row, comptime T: type, idx: u15, alloc: std.mem.Allocator) !T {
// TODO: handle optionals
return switch (T) {
[]u8, []const u8 => self.getTextAlloc(idx, alloc),
i64 => self.getI64(idx),
Uuid => self.getUuid(idx),
DateTime => self.getDateTime(idx),
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else => {
switch (@typeInfo(T)) {
.Optional => switch (c.sqlite3_column_type(self.stmt, idx)) {
c.SQLITE_NULL => return null,
else => return try self.getAlloc(std.meta.Child(T), idx, alloc),
},
else => @compileError("unknown type " ++ @typeName(T)),
}
},
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};
}
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};
pub const PreparedStmt = struct {
stmt: *c.sqlite3_stmt,
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db: *c.sqlite3,
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pub fn bindNull(self: *PreparedStmt, idx: u15) !void {
return switch (c.sqlite3_bind_null(self.stmt, idx)) {
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c.SQLITE_OK => {},
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else => error.UnknownError,
};
}
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pub fn bindUuid(self: *PreparedStmt, idx: u15, id: Uuid) !void {
const str = id.toCharArray();
return self.bindText(idx, &str);
}
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pub fn bindText(self: *PreparedStmt, idx: u15, str: []const u8) !void {
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return switch (c.sqlite3_bind_text(self.stmt, idx, str.ptr, @intCast(c_int, str.len), c.SQLITE_TRANSIENT)) {
c.SQLITE_OK => {},
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else => error.UnknownError,
};
}
pub fn bindI64(self: *PreparedStmt, idx: u15, val: i64) !void {
return switch (c.sqlite3_bind_int64(self.stmt, idx, val)) {
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c.SQLITE_OK => {},
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else => error.UnknownError,
};
}
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pub fn bindDateTime(self: *PreparedStmt, idx: u15, val: DateTime) !void {
return self.bindI64(idx, val.seconds_since_epoch);
}
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pub fn bind(self: *PreparedStmt, idx: u15, val: anytype) !void {
return switch (@TypeOf(val)) {
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[]u8, []const u8 => self.bindText(idx, val),
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i64 => self.bindI64(idx, val),
Uuid => self.bindUuid(idx, val),
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DateTime => self.bindDateTime(idx, val),
@TypeOf(null) => self.bindNull(idx),
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else => |T| switch (@typeInfo(T)) {
.Optional => if (val) |v| self.bind(idx, v) else self.bindNull(idx),
else => @compileError("Unknown Type" ++ @typeName(T)),
},
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};
}
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pub fn step(self: *PreparedStmt) !?Row {
return switch (c.sqlite3_step(self.stmt)) {
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c.SQLITE_ROW => Row{ .stmt = self.stmt, .db = self.db },
c.SQLITE_DONE => null,
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else => |err| blk: {
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std.log.debug("sql error {}: {s}", .{ err, c.sqlite3_errmsg(self.db) });
std.log.debug("Failed on SQL:\n==========\n{s}\n==========", .{self.getGeneratingSql()});
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break :blk error.UnknownError;
},
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};
}
pub fn finalize(self: *PreparedStmt) void {
_ = c.sqlite3_finalize(self.stmt);
}
pub fn reset(self: *PreparedStmt) void {
_ = c.sqlite3_reset(self.stmt);
}
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fn getGeneratingSql(self: *PreparedStmt) ?[*:0]const u8 {
return c.sqlite3_sql(self.stmt);
}
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};