Add sql support for blobs

src/sql/lib.zig

@@ -7,6 +7,40 @@ const c = @cImport({
 const Uuid = util.Uuid;
 const DateTime = util.DateTime;
 
+pub fn ByteArray(comptime n: usize) type {
+    return struct {
+        const Self = @This();
+
+        data: [n]u8,
+
+        pub fn bindToSqlite(self: Self, stmt: *PreparedStmt, idx: u15) !void {
+            return stmt.bindBlob(idx, &self.data);
+        }
+
+        pub fn getFromSqlite(row: *Row, idx: u15, _: std.mem.Alloc) !Self {
+            var self: Self = undefined;
+            _ = try row.getBlob(idx, &self.data);
+            return self;
+        }
+    };
+}
+
+pub const ByteSlice = struct {
+    const Self = @This();
+
+    data: []const u8,
+
+    pub fn bindToSqlite(self: Self, stmt: *PreparedStmt, idx: u15) !void {
+        return stmt.bindBlob(idx, self.data);
+    }
+
+    pub fn getFromSqlite(row: *Row, idx: u15, alloc: std.mem.Alloc) !void {
+        return Self{
+            .data = try row.getBlobAlloc(idx, alloc),
+        };
+    }
+};
+
 pub const Sqlite = struct {
     db: *c.sqlite3,
 
@@ -63,6 +97,24 @@ pub const Row = struct {
         return self.getText(idx, buf);
     }
 
+    pub fn getBlob(self: Row, idx: u15, buf: []u8) ![]u8 {
+        const ptr = c.sqlite3_column_blob(self.stmt, idx);
+
+        const size = @intCast(usize, c.sqlite3_column_bytes(self.stmt, idx));
+        if (size > buf.len) return error.StreamTooLong;
+        for (ptr[0..size]) |ch, i| buf[i] = ch;
+
+        return buf[0..size];
+    }
+
+    pub fn getBlobAlloc(self: Row, idx: u15, alloc: std.mem.Allocator) ![]u8 {
+        const size = c.sqlite3_column_bytes(self.stmt, idx);
+        var buf = try alloc.alloc(u8, @intCast(usize, size));
+        errdefer alloc.free(buf);
+
+        return self.getBlob(idx, buf);
+    }
+
     pub fn getUuid(self: Row, idx: u15) !Uuid {
         var buf: [Uuid.string_len + 1]u8 = undefined;
         _ = try self.getText(idx, &buf);
@@ -87,6 +139,7 @@ pub const Row = struct {
                         c.SQLITE_NULL => return null,
                         else => return try self.getAlloc(std.meta.Child(T), idx, alloc),
                     },
+                    .Struct, .Union, .Enum, .Opaque => if (@hasDecl(T, "getFromSqlite")) T.getFromSqlite(self, idx, alloc),
                     else => @compileError("unknown type " ++ @typeName(T)),
                 }
             },
@@ -117,6 +170,13 @@ pub const PreparedStmt = struct {
         };
     }
 
+    pub fn bindBlob(self: *PreparedStmt, idx: u15, blob: []const u8) !void {
+        return switch (c.sqlite3_bind_blob64(self.stmt, idx, blob.ptr, blob.len, c.SQLITE_TRANSIENT)) {
+            c.SQLITE_OK => {},
+            else => error.UnknownError,
+        };
+    }
+
     pub fn bindI64(self: *PreparedStmt, idx: u15, val: i64) !void {
         return switch (c.sqlite3_bind_int64(self.stmt, idx, val)) {
             c.SQLITE_OK => {},
@@ -137,6 +197,7 @@ pub const PreparedStmt = struct {
             @TypeOf(null) => self.bindNull(idx),
             else => |T| switch (@typeInfo(T)) {
                 .Optional => if (val) |v| self.bind(idx, v) else self.bindNull(idx),
+                .Struct, .Union, .Enum, .Opaque => if (@hasDecl(T, "bindToSqlite")) val.bindToSqlite(self, idx),
                 else => @compileError("Unknown Type" ++ @typeName(T)),
             },
         };