move files

backend/v3/storage/database/column.go

@@ -0,0 +1,55 @@
+package database
+
+type Columns []Column
+
+// Write implements [Column].
+func (m Columns) Write(builder *StatementBuilder) {
+	for i, col := range m {
+		if i > 0 {
+			builder.WriteString(", ")
+		}
+		col.Write(builder)
+	}
+}
+
+type Column interface {
+	Write(builder *StatementBuilder)
+}
+
+type column struct {
+	name string
+}
+
+func NewColumn(name string) Column {
+	return column{name: name}
+}
+
+// Write implements [Column].
+func (c column) Write(builder *StatementBuilder) {
+	builder.WriteString(c.name)
+}
+
+var _ Column = (*column)(nil)
+
+type ignoreCaseColumn interface {
+	Column
+	WriteIgnoreCase(builder *StatementBuilder)
+}
+
+func NewIgnoreCaseColumn(name, suffix string) ignoreCaseColumn {
+	return ignoreCaseCol{
+		column: column{name: name},
+		suffix: suffix,
+	}
+}
+
+type ignoreCaseCol struct {
+	column
+	suffix string
+}
+
+// WriteIgnoreCase implements [ignoreCaseColumn].
+func (c ignoreCaseCol) WriteIgnoreCase(builder *StatementBuilder) {
+	c.column.Write(builder)
+	builder.WriteString(c.suffix)
+}