move files

backend/v3/storage/database/condition.go

@@ -0,0 +1,112 @@
+package database
+
+type Condition interface {
+	Write(builder *StatementBuilder)
+}
+
+type and struct {
+	conditions []Condition
+}
+
+// Write implements [Condition].
+func (a *and) Write(builder *StatementBuilder) {
+	if len(a.conditions) > 1 {
+		builder.WriteString("(")
+		defer builder.WriteString(")")
+	}
+	for i, condition := range a.conditions {
+		if i > 0 {
+			builder.WriteString(" AND ")
+		}
+		condition.(Condition).Write(builder)
+	}
+}
+
+func And(conditions ...Condition) *and {
+	return &and{conditions: conditions}
+}
+
+var _ Condition = (*and)(nil)
+
+type or struct {
+	conditions []Condition
+}
+
+// Write implements [Condition].
+func (o *or) Write(builder *StatementBuilder) {
+	if len(o.conditions) > 1 {
+		builder.WriteString("(")
+		defer builder.WriteString(")")
+	}
+	for i, condition := range o.conditions {
+		if i > 0 {
+			builder.WriteString(" OR ")
+		}
+		condition.(Condition).Write(builder)
+	}
+}
+
+func Or(conditions ...Condition) *or {
+	return &or{conditions: conditions}
+}
+
+var _ Condition = (*or)(nil)
+
+type isNull struct {
+	column Column
+}
+
+// Write implements [Condition].
+func (i *isNull) Write(builder *StatementBuilder) {
+	i.column.Write(builder)
+	builder.WriteString(" IS NULL")
+}
+
+func IsNull(column Column) *isNull {
+	return &isNull{column: column}
+}
+
+var _ Condition = (*isNull)(nil)
+
+type isNotNull struct {
+	column Column
+}
+
+// Write implements [Condition].
+func (i *isNotNull) Write(builder *StatementBuilder) {
+	i.column.Write(builder)
+	builder.WriteString(" IS NOT NULL")
+}
+
+func IsNotNull(column Column) *isNotNull {
+	return &isNotNull{column: column.(Column)}
+}
+
+var _ Condition = (*isNotNull)(nil)
+
+type valueCondition func(builder *StatementBuilder)
+
+func NewTextCondition[V Text](col Column, op TextOperation, value V) Condition {
+	return valueCondition(func(builder *StatementBuilder) {
+		writeTextOperation(builder, col, op, value)
+	})
+}
+
+func NewNumberCondition[V Number](col Column, op NumberOperation, value V) Condition {
+	return valueCondition(func(builder *StatementBuilder) {
+		writeNumberOperation(builder, col, op, value)
+	})
+}
+
+func NewBooleanCondition[V Boolean](col Column, value V) Condition {
+	return valueCondition(func(builder *StatementBuilder) {
+		writeBooleanOperation(builder, col, value)
+	})
+}
+
+// Write implements [Condition].
+func (c valueCondition) Write(builder *StatementBuilder) {
+	c(builder)
+}
+
+var _ Condition = (*valueCondition)(nil)