From a4f6fca6759887abdec81195112eba3ecf3a299e Mon Sep 17 00:00:00 2001
From: jaina heartles <me@heartles.xyz>
Date: Thu, 21 Jul 2022 21:18:43 -0700
Subject: [PATCH] Support optional types in sql

---
 src/sql/lib.zig | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/sql/lib.zig b/src/sql/lib.zig
index ba62de4..ad509fd 100644
--- a/src/sql/lib.zig
+++ b/src/sql/lib.zig
@@ -80,7 +80,16 @@ pub const Row = struct {
             i64 => self.getI64(idx),
             Uuid => self.getUuid(idx),
             DateTime => self.getDateTime(idx),
-            else => @compileError("unknown type " ++ @typeName(T)),
+
+            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)),
+                }
+            },
         };
     }
 };
@@ -91,7 +100,7 @@ pub const PreparedStmt = struct {
 
     pub fn bindNull(self: *PreparedStmt, idx: u15) !void {
         return switch (c.sqlite3_bind_null(self.stmt, idx)) {
-            .SQLITE_OK => {},
+            c.SQLITE_OK => {},
             else => error.UnknownError,
         };
     }
@@ -126,7 +135,10 @@ pub const PreparedStmt = struct {
             Uuid => self.bindUuid(idx, val),
             DateTime => self.bindDateTime(idx, val),
             @TypeOf(null) => self.bindNull(idx),
-            else => @compileError("Unknown Type"),
+            else => |T| switch (@typeInfo(T)) {
+                .Optional => if (val) |v| self.bind(idx, v) else self.bindNull(idx),
+                else => @compileError("Unknown Type" ++ @typeName(T)),
+            },
         };
     }