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schema.go
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schema.go
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package ceous
type (
SchemaField interface {
// String returns the string representation of the field. That is, its name.
String() string
// QualifiedString returns the name of the field qualified by the alias of
// the given schema.
QualifiedName(Schema) string
IsPK() bool
IsAutoInc() bool
}
AliasedSchemaField interface {
SchemaField
Reference() string
}
BaseSchemaField struct {
name string
pk bool
autoInc bool
}
aliasSchemaField struct {
SchemaField
schema Schema
}
Columnable interface {
Columns() []SchemaField
}
Schema interface {
PrimaryKey() SchemaField
Alias() string
Table() string
As(string) Schema
Columnable
}
BaseSchema struct {
id SchemaField
tableName string
alias string
ColumnsArr []SchemaField
}
aliasSchema struct {
Schema
alias string
}
)
type FieldOption func(*BaseSchemaField)
func NewSchemaField(name string, options ...FieldOption) *BaseSchemaField {
field := &BaseSchemaField{
name: name,
}
for _, option := range options {
option(field)
}
return field
}
func FieldPK(field *BaseSchemaField) {
field.pk = true
}
func FieldAutoIncrement(field *BaseSchemaField) {
field.autoInc = true
}
func (field *BaseSchemaField) String() string {
return field.name
}
func (field *BaseSchemaField) QualifiedName(schema Schema) string {
alias := schema.Alias()
if alias != "" {
return alias + "." + field.name
}
return field.name
}
func (field *BaseSchemaField) IsAutoInc() bool {
return field.autoInc
}
func (field *BaseSchemaField) IsPK() bool {
return field.pk
}
func NewAliasSchemaField(schema Schema, field SchemaField) AliasedSchemaField {
return &aliasSchemaField{field, schema}
}
func (field *aliasSchemaField) Reference() string {
return field.QualifiedName(field.schema)
}
func (field *aliasSchemaField) String() string {
return field.Reference()
}
func NewBaseSchema(tableName, alias string, columns ...SchemaField) *BaseSchema {
baseSchema := &BaseSchema{
tableName: tableName,
alias: alias,
ColumnsArr: columns,
}
for _, col := range columns {
if col.IsPK() {
baseSchema.id = col
break
}
}
return baseSchema
}
// FieldAlias creates a function that will create a SchemaField that will be
// bound to the schema passed.
func FieldAlias(schema Schema) func(SchemaField) AliasedSchemaField {
return func(field SchemaField) AliasedSchemaField {
return NewAliasSchemaField(schema, field)
}
}
func (schema *BaseSchema) PrimaryKey() SchemaField {
return schema.id
}
func (schema *BaseSchema) Alias() string {
return schema.alias
}
func (schema *BaseSchema) Table() string {
return schema.tableName
}
func (schema *BaseSchema) Columns() []SchemaField {
return schema.ColumnsArr
}
func (schema *BaseSchema) As(alias string) Schema {
return &aliasSchema{schema, alias}
}
func (schema *aliasSchema) Alias() string {
if schema.Schema.Alias() == "" {
return schema.alias
}
return schema.Schema.Alias() + "_" + schema.alias
}