create.go
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	package db

	import (
	"fmt"
	"strings"
	)

	type ColumnType int

	type OptionalInt struct {
	Set bool
	Value int
	}

	type OptionalString struct {
	Set bool
	Value string
	}

	type SQLBuilder interface {
	ToSQL() (string, error)
	}

	type Column struct {
	Dialect DialectType
	Name string
	Nullable bool
	Default OptionalString
	Type ColumnType
	Size OptionalInt
	PrimaryKey bool
	}

	type CreateTableSqlBuilder struct {
	Dialect DialectType
	Name string
	IfNotExists bool
	ColumnOrder []string
	Columns map[string]*Column
	Constraints []string
	}

	const (
	ColumnTypeBool ColumnType = iota
	ColumnTypeSmallInt ColumnType = iota
	ColumnTypeInteger ColumnType = iota
	ColumnTypeChar ColumnType = iota
	ColumnTypeVarChar ColumnType = iota
	ColumnTypeText ColumnType = iota
	ColumnTypeDateTime ColumnType = iota
	)

	var _ SQLBuilder = &CreateTableSqlBuilder{}

	var UnsetSize OptionalInt = OptionalInt{Set: false, Value: 0}
	var UnsetDefault OptionalString = OptionalString{Set: false, Value: ""}

	func (d ColumnType) Format(dialect DialectType, size OptionalInt) (string, error) {
	if dialect != DialectMySQL && dialect != DialectSQLite {
	return "", fmt.Errorf("unsupported column type %d for dialect %d and size %v", d, dialect, size)
	}
	switch d {
	case ColumnTypeSmallInt:
	{
	if dialect == DialectSQLite {
	return "INTEGER", nil
	}
	mod := ""
	if size.Set {
	mod = fmt.Sprintf("(%d)", size.Value)
	}
	return "SMALLINT" + mod, nil
	}
	case ColumnTypeInteger:
	{
	if dialect == DialectSQLite {
	return "INTEGER", nil
	}
	mod := ""
	if size.Set {
	mod = fmt.Sprintf("(%d)", size.Value)
	}
	return "INT" + mod, nil
	}
	case ColumnTypeChar:
	{
	if dialect == DialectSQLite {
	return "TEXT", nil
	}
	mod := ""
	if size.Set {
	mod = fmt.Sprintf("(%d)", size.Value)
	}
	return "CHAR" + mod, nil
	}
	case ColumnTypeVarChar:
	{
	if dialect == DialectSQLite {
	return "TEXT", nil
	}
	mod := ""
	if size.Set {
	mod = fmt.Sprintf("(%d)", size.Value)
	}
	return "VARCHAR" + mod, nil
	}
	case ColumnTypeBool:
	{
	if dialect == DialectSQLite {
	return "INTEGER", nil
	}
	return "TINYINT(1)", nil
	}
	case ColumnTypeDateTime:
	return "DATETIME", nil
	case ColumnTypeText:
	return "TEXT", nil
	}
	return "", fmt.Errorf("unsupported column type %d for dialect %d and size %v", d, dialect, size)
	}

	func (c Column) SetName(name string) Column {
	c.Name = name
	return c
	}

	func (c Column) SetNullable(nullable bool) Column {
	c.Nullable = nullable
	return c
	}

	func (c Column) SetPrimaryKey(pk bool) Column {
	c.PrimaryKey = pk
	return c
	}

	func (c Column) SetDefault(value string) Column {
	c.Default = OptionalString{Set: true, Value: value}
	return c
	}

	func (c Column) SetDefaultCurrentTimestamp() Column {
	def := "NOW()"
	if c.Dialect == DialectSQLite {
	def = "CURRENT_TIMESTAMP"
	}
	c.Default = OptionalString{Set: true, Value: def}
	return c
	}

	func (c Column) SetType(t ColumnType) Column {
	c.Type = t
	return c
	}

	func (c Column) SetSize(size int) Column {
	c.Size = OptionalInt{Set: true, Value: size}
	return c
	}

	func (c *Column) String() (string, error) {
	var str strings.Builder

	str.WriteString(c.Name)

	str.WriteString(" ")
	typeStr, err := c.Type.Format(c.Dialect, c.Size)
	if err != nil {
	return "", err
	}

	str.WriteString(typeStr)

	if !c.Nullable {
	str.WriteString(" NOT NULL")
	}

	if c.Default.Set {
	str.WriteString(" DEFAULT ")
	str.WriteString(c.Default.Value)
	}

	if c.PrimaryKey {
	str.WriteString(" PRIMARY KEY")
	}

	return str.String(), nil
	}

	func (b CreateTableSqlBuilder) Column(column Column) *CreateTableSqlBuilder {
	if b.Columns == nil {
	b.Columns = make(map[string]*Column)
	}
	b.Columns[column.Name] = column
	b.ColumnOrder = append(b.ColumnOrder, column.Name)
	return b
	}

	func (b CreateTableSqlBuilder) UniqueConstraint(columns ...string) CreateTableSqlBuilder {
	for _, column := range columns {
	if _, ok := b.Columns[column]; !ok {
	// This fails silently.
	return b
	}
	}
	b.Constraints = append(b.Constraints, fmt.Sprintf("UNIQUE(%s)", strings.Join(columns, ",")))
	return b
	}

	func (b CreateTableSqlBuilder) SetIfNotExists(ine bool) CreateTableSqlBuilder {
	b.IfNotExists = ine
	return b
	}

	func (b *CreateTableSqlBuilder) ToSQL() (string, error) {
	var str strings.Builder

	str.WriteString("CREATE TABLE ")
	if b.IfNotExists {
	str.WriteString("IF NOT EXISTS ")
	}
	str.WriteString(b.Name)

	var things []string
	for _, columnName := range b.ColumnOrder {
	column, ok := b.Columns[columnName]
	if !ok {
	return "", fmt.Errorf("column not found: %s", columnName)
	}
	columnStr, err := column.String()
	if err != nil {
	return "", err
	}
	things = append(things, columnStr)
	}
	for _, constraint := range b.Constraints {
	things = append(things, constraint)
	}

	if thingLen := len(things); thingLen > 0 {
	str.WriteString(" ( ")
	for i, thing := range things {
	str.WriteString(thing)
	if i < thingLen-1 {
	str.WriteString(", ")
	}
	}
	str.WriteString(" )")
	}

	return str.String(), nil
	}

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