Type-introspected insert

src/main/db.zig

@@ -22,7 +22,7 @@ fn join(comptime vals: anytype, comptime joiner: String) String {
             result = std.fmt.comptimePrint("{s}{s}{s}", .{ result, joiner, v });
         }
 
-        return result[2..];
+        return result[joiner.len..];
     }
 }
 
@@ -42,6 +42,26 @@ const Query = struct {
     }
 };
 
+const Insert = struct {
+    into: String,
+    columns: []const String,
+    count: usize = 1,
+
+    pub fn str(comptime self: Insert) String {
+        comptime {
+            const row = std.fmt.comptimePrint(
+                "({s})",
+                .{join(.{"?"} ** self.columns.len, ", ")},
+            );
+
+            return std.fmt.comptimePrint(
+                "INSERT INTO {s} ({s}) VALUES {s};",
+                .{ self.into, join(self.columns, ", "), join(.{row} ** self.count, ", ") },
+            );
+        }
+    }
+};
+
 fn filterOut(comptime vals: []const String, comptime to_ignore: []const String) []const String {
     comptime {
         var result: [vals.len]String = undefined;
@@ -82,6 +102,12 @@ pub const Database = struct {
             \\  content TEXT NOT NULL
             \\) STRICT;
             \\
+            \\CREATE TABLE IF NOT EXISTS
+            \\user(
+            \\  id TEXT PRIMARY KEY,
+            \\  handle TEXT NOT NULL
+            \\) STRICT;
+            \\
         );
         defer stmt.finalize();
 
@@ -128,14 +154,33 @@ pub const Database = struct {
         return self.getById(models.Note, id, alloc);
     }
 
-    pub fn insertNote(self: *Database, note: models.Note) !void {
+    pub fn insert(self: *Database, comptime T: type, val: T) !void {
-        var stmt = try self.db.prepare("INSERT INTO note (id, content) VALUES(?, ?);");
+        const fields = comptime std.meta.fieldNames(T);
+        const q = comptime (Insert{
+            .into = tableName(T),
+            .columns = fields,
+            .count = 1,
+        }).str();
+
+        var stmt = try self.db.prepare(q);
         defer stmt.finalize();
 
-        const id_str = note.id.toCharArray();
+        inline for (fields) |f, i| {
-        try stmt.bindText(1, &id_str);
+            const arg_idx = i + 1;
-        try stmt.bindText(2, note.content);
+            switch (@TypeOf(@field(val, f))) {
+                []const u8 => try stmt.bindText(arg_idx, @field(val, f)),
+                Uuid => {
+                    const str = @field(val, f).toCharArray();
+                    try stmt.bindText(arg_idx, &str);
+                },
+                else => @compileError("unknown type"),
+            }
+        }
 
-        if ((try stmt.step()) != null) return error.UnexpectedError;
+        if ((try stmt.step()) != null) return error.UnknownError;
+    }
+
+    pub fn insertNote(self: *Database, note: models.Note) !void {
+        return self.insert(models.Note, note);
     }
 };

src/sql/lib.zig

@@ -86,7 +86,11 @@ pub const PreparedStmt = struct {
             c.SQLITE_ROW => Row{ .stmt = self.stmt, .db = self.db },
             c.SQLITE_DONE => null,
 
-            else => error.UnknownError,
+            else => |err| blk: {
+                std.debug.print("sql error {}\n", .{err});
+                std.debug.print("{s}\n", .{c.sqlite3_errmsg(self.db)});
+                break :blk error.UnknownError;
+            },
         };
     }