move files

backend/v3/storage/database/query.go

@@ -0,0 +1,66 @@
+package database
+
+type QueryOption func(opts *QueryOpts)
+
+func WithCondition(condition Condition) QueryOption {
+	return func(opts *QueryOpts) {
+		opts.Condition = condition
+	}
+}
+
+func WithOrderBy(orderBy ...Column) QueryOption {
+	return func(opts *QueryOpts) {
+		opts.OrderBy = orderBy
+	}
+}
+
+func WithLimit(limit uint32) QueryOption {
+	return func(opts *QueryOpts) {
+		opts.Limit = limit
+	}
+}
+
+func WithOffset(offset uint32) QueryOption {
+	return func(opts *QueryOpts) {
+		opts.Offset = offset
+	}
+}
+
+type QueryOpts struct {
+	Condition Condition
+	OrderBy   Columns
+	Limit     uint32
+	Offset    uint32
+}
+
+func (opts *QueryOpts) WriteCondition(builder *StatementBuilder) {
+	if opts.Condition == nil {
+		return
+	}
+	builder.WriteString(" WHERE ")
+	opts.Condition.Write(builder)
+}
+
+func (opts *QueryOpts) WriteOrderBy(builder *StatementBuilder) {
+	if len(opts.OrderBy) == 0 {
+		return
+	}
+	builder.WriteString(" ORDER BY ")
+	Columns(opts.OrderBy).Write(builder)
+}
+
+func (opts *QueryOpts) WriteLimit(builder *StatementBuilder) {
+	if opts.Limit == 0 {
+		return
+	}
+	builder.WriteString(" LIMIT ")
+	builder.WriteArg(opts.Limit)
+}
+
+func (opts *QueryOpts) WriteOffset(builder *StatementBuilder) {
+	if opts.Offset == 0 {
+		return
+	}
+	builder.WriteString(" OFFSET ")
+	builder.WriteArg(opts.Offset)
+}