return 1=0 when values of condition IN are empty

op_condition.go

@@ -100,14 +100,23 @@ func newCondLike(format string) OpBuilder {
 func newCondIn(format string) OpBuilder {
 	return OpBuilderFunc(func(ab *ArgsBuilder, op op.Op) string {
 		vs := op.Val.([]interface{})
-		if len(vs) == 0 {
-			return ""
-		}
 
-		if len(vs) == 1 {
+		switch len(vs) {
+		case 0:
+			return "1=0"
+
+		case 1:
 			if _vs, ok := vs[0].([]interface{}); ok {
 				vs = _vs
 			}
+
+			switch len(vs) {
+			case 0:
+				return "1=0"
+
+			case 1:
+				return fmt.Sprintf(format, ab.Quote(getOpKey(op)), ab.Add(vs[0]))
+			}
 		}
 
 		ss := make([]string, 0, len(vs))

op_condition_test.go

@@ -15,6 +15,7 @@
 package sqlx
 
 import (
+	"reflect"
 	"testing"
 
 	"github.com/xgfone/go-op"
@@ -68,3 +69,67 @@ func TestAnd(t *testing.T) {
 		}
 	}
 }
+
+func TestCondInForNil(t *testing.T) {
+	ab := NewArgsBuilder(MySQL)
+	sql := BuildOper(ab, op.In("field"))
+	args := ab.Args()
+
+	expectsql := ""
+	expectargs := []any{}
+
+	if sql != expectsql {
+		t.Errorf("expect sql '%s', but got '%s'", expectsql, sql)
+	}
+	if !reflect.DeepEqual(args, expectargs) {
+		t.Errorf("expect args %v, but got %v", expectargs, args)
+	}
+}
+
+func TestCondInForOne(t *testing.T) {
+	ab := NewArgsBuilder(MySQL)
+	sql := BuildOper(ab, op.In("field", "value"))
+	args := ab.Args()
+
+	expectsql := "`field` IN (?)"
+	expectargs := []any{"value"}
+
+	if sql != expectsql {
+		t.Errorf("expect sql '%s', but got '%s'", expectsql, sql)
+	}
+	if !reflect.DeepEqual(args, expectargs) {
+		t.Errorf("expect args %v, but got %v", expectargs, args)
+	}
+}
+
+func TestCondInForOneSliceOne(t *testing.T) {
+	ab := NewArgsBuilder(MySQL)
+	sql := BuildOper(ab, op.In("field", []any{"value"}))
+	args := ab.Args()
+
+	expectsql := "`field` IN (?)"
+	expectargs := []any{"value"}
+
+	if sql != expectsql {
+		t.Errorf("expect sql '%s', but got '%s'", expectsql, sql)
+	}
+	if !reflect.DeepEqual(args, expectargs) {
+		t.Errorf("expect args %v, but got %v", expectargs, args)
+	}
+}
+
+func TestCondInForOneSliceTwo(t *testing.T) {
+	ab := NewArgsBuilder(MySQL)
+	sql := BuildOper(ab, op.In("field", []any{"value1", "value2"}))
+	args := ab.Args()
+
+	expectsql := "`field` IN (?, ?)"
+	expectargs := []any{"value1", "value2"}
+
+	if sql != expectsql {
+		t.Errorf("expect sql '%s', but got '%s'", expectsql, sql)
+	}
+	if !reflect.DeepEqual(args, expectargs) {
+		t.Errorf("expect args %v, but got %v", expectargs, args)
+	}
+}