add initial sqlite support, add modernc.org/sqlite to vendored libs

Signed-off-by: kim (grufwub) <grufwub@gmail.com>

vendor/github.com/uptrace/bun/dialect/sqlitedialect/dialect.go

@@ -0,0 +1,94 @@
+package sqlitedialect
+
+import (
+	"database/sql"
+	"reflect"
+	"sync"
+
+	"github.com/uptrace/bun/dialect"
+	"github.com/uptrace/bun/dialect/feature"
+	"github.com/uptrace/bun/dialect/sqltype"
+	"github.com/uptrace/bun/schema"
+)
+
+type Dialect struct {
+	tables   *schema.Tables
+	features feature.Feature
+
+	appenderMap sync.Map
+	scannerMap  sync.Map
+}
+
+func New() *Dialect {
+	d := new(Dialect)
+	d.tables = schema.NewTables(d)
+	d.features = feature.Returning | feature.InsertTableAlias | feature.DeleteTableAlias
+	return d
+}
+
+func (d *Dialect) Init(*sql.DB) {}
+
+func (d *Dialect) Name() dialect.Name {
+	return dialect.SQLite
+}
+
+func (d *Dialect) Features() feature.Feature {
+	return d.features
+}
+
+func (d *Dialect) Tables() *schema.Tables {
+	return d.tables
+}
+
+func (d *Dialect) OnTable(table *schema.Table) {
+	for _, field := range table.FieldMap {
+		d.onField(field)
+	}
+}
+
+func (d *Dialect) onField(field *schema.Field) {
+	// INTEGER PRIMARY KEY is an alias for the ROWID.
+	// It is safe to convert all ints to INTEGER, because SQLite types don't have size.
+	switch field.DiscoveredSQLType {
+	case sqltype.SmallInt, sqltype.BigInt:
+		field.DiscoveredSQLType = sqltype.Integer
+	}
+}
+
+func (d *Dialect) IdentQuote() byte {
+	return '"'
+}
+
+func (d *Dialect) Append(fmter schema.Formatter, b []byte, v interface{}) []byte {
+	return schema.Append(fmter, b, v, nil)
+}
+
+func (d *Dialect) Appender(typ reflect.Type) schema.AppenderFunc {
+	if v, ok := d.appenderMap.Load(typ); ok {
+		return v.(schema.AppenderFunc)
+	}
+
+	fn := schema.Appender(typ, nil)
+
+	if v, ok := d.appenderMap.LoadOrStore(typ, fn); ok {
+		return v.(schema.AppenderFunc)
+	}
+	return fn
+}
+
+func (d *Dialect) FieldAppender(field *schema.Field) schema.AppenderFunc {
+	return schema.FieldAppender(d, field)
+}
+
+func (d *Dialect) Scanner(typ reflect.Type) schema.ScannerFunc {
+	if v, ok := d.scannerMap.Load(typ); ok {
+		return v.(schema.ScannerFunc)
+	}
+
+	fn := scanner(typ)
+
+	if v, ok := d.scannerMap.LoadOrStore(typ, fn); ok {
+		return v.(schema.ScannerFunc)
+	}
+	return fn
+}