downgrade go version & add drop table

drop_table.go

@@ -0,0 +1,48 @@
+package sqls
+
+import (
+	"strings"
+)
+
+type dropTableBuilder struct {
+	builder  *sqlBuilder
+	table    string
+	ifExists bool
+}
+
+func newDropTableBuilder() *dropTableBuilder {
+	builder := &dropTableBuilder{}
+	builder.builder = newSqlBuilder()
+	builder.ifExists = false
+	return builder
+}
+
+func DROP_TABLE(table string) *dropTableBuilder {
+	s := newDropTableBuilder()
+	s.table = table
+	return s
+}
+
+func (s *dropTableBuilder) IF_EXISTS() *dropTableBuilder {
+	s.ifExists = true
+	return s
+}
+
+func (s *dropTableBuilder) Param(v any) string {
+	return s.builder.Param(v)
+}
+
+func (s *dropTableBuilder) Params() []any {
+	return s.builder.Params(s.String())
+}
+
+func (s *dropTableBuilder) String() string {
+	var sqlString string
+	keyword := "DROP TABLE"
+	if s.ifExists {
+		keyword += " IF EXISTS"
+	}
+
+	sqlString += s.builder.join(keyword, "", []string{s.table}, ", ", "")
+	return strings.Trim(sqlString, " ")
+}

drop_table_test.go

@@ -0,0 +1,15 @@
+package sqls
+
+import (
+	"testing"
+)
+
+func TestDropTableAddConstraint(t *testing.T) {
+	s := DROP_TABLE("TABLE").IF_EXISTS()
+	result := s.String()
+	expected := "DROP TABLE IF EXISTS TABLE"
+
+	if result != expected {
+		t.Errorf("Case1() 返回值为 %s，期望值为 %s", result, expected)
+	}
+}

go.mod

@@ -1,3 +1,3 @@
 module github.com/yinxulai/sqls
 
-go 1.22
+go 1.21.0