InsertBuilder should set string defaut for sqlx Select() (#78)

builder_insert.go

@@ -49,9 +49,6 @@ func (b *InsertBuilder) Set(k string, v interface{}) *InsertBuilder {
 
 	switch v.(type) {
 	case string:
-		if v.(string) == "" {
-			return b
-		}
 	case uint64, uint, int64, int, int32, int16, int8, bool, byte, float64, float32:
 		if v == 0 {
 			return b

builder_x.go

@@ -18,7 +18,7 @@ package sqlxb
 
 import "fmt"
 
-// To build sql, like: SELECT DISTINCT f.id FROM foo f INNER_JOIN JOIN (SELECT foo_id FROM bar) b ON b.foo_id = f.id
+// ToId build sql, like: SELECT DISTINCT f.id FROM foo f INNER_JOIN JOIN (SELECT foo_id FROM bar) b ON b.foo_id = f.id
 // Sql for MySQL, Clickhouse....
 //
 // @author Sim

to_sql.go

@@ -266,7 +266,7 @@ func (built *Built) countBuilder() *strings.Builder {
 
 func (built *Built) SqlOfPage() (string, string, []interface{}, map[string]string) {
 	vs := []interface{}{}
-	km := make(map[string]string) //nil for sub From builder,
+	km := make(map[string]string) //nil for sub FromId builder,
 	dataSql, kmp := built.sqlData(&vs, km)
 	countSql := built.sqlCount()
 
@@ -275,7 +275,7 @@ func (built *Built) SqlOfPage() (string, string, []interface{}, map[string]strin
 
 func (built *Built) SqlOfSelect() (string, []interface{}, map[string]string) {
 	vs := []interface{}{}
-	km := make(map[string]string) //nil for sub From builder,
+	km := make(map[string]string) //nil for sub FromId builder,
 	dataSql, kmp := built.sqlData(&vs, km)
 	return dataSql, vs, kmp
 }