add the comment for the sql statement

dml_delete.go

@@ -39,6 +39,7 @@ func NewDeleteBuilder(tables ...string) *DeleteBuilder {
 // DeleteBuilder is used to build the DELETE statement.
 type DeleteBuilder struct {
 	db      *DB
+	comment string
 	dtables []string
 	ftables []sqlTable
 	jtables []joinTable
@@ -124,6 +125,12 @@ func (b *DeleteBuilder) WhereNamedArgs(andArgs ...sql.NamedArg) *DeleteBuilder {
 	return b
 }
 
+// Comment set the comment, which will be appended to the end of the built SQL statement.
+func (b *DeleteBuilder) Comment(comment string) *DeleteBuilder {
+	b.comment = comment
+	return b
+}
+
 // Where sets the "WHERE" conditions.
 func (b *DeleteBuilder) Where(andConditions ...op.Condition) *DeleteBuilder {
 	b.wheres = appendWheres(b.wheres, andConditions...)
@@ -202,6 +209,12 @@ func (b *DeleteBuilder) Build() (sql string, args *ArgsBuilder) {
 		buf.WriteString(BuildOper(args, op.And(b.wheres...)))
 	}
 
+	if b.comment != "" {
+		buf.WriteString("/* ")
+		buf.WriteString(b.comment)
+		buf.WriteString(" */")
+	}
+
 	sql = buf.String()
 	putBuffer(buf)
 	return

dml_insert.go

@@ -41,6 +41,7 @@ type InsertBuilder struct {
 
 	verb    string
 	table   string
+	comment string
 	columns []string
 	values  [][]any
 }
@@ -68,6 +69,12 @@ func (b *InsertBuilder) ReplaceInto(table string) *InsertBuilder {
 	return b
 }
 
+// Comment set the comment, which will be appended to the end of the built SQL statement.
+func (b *InsertBuilder) Comment(comment string) *InsertBuilder {
+	b.comment = comment
+	return b
+}
+
 // Columns sets the inserted columns.
 func (b *InsertBuilder) Columns(columns ...string) *InsertBuilder {
 	b.columns = columns
@@ -304,6 +311,12 @@ func (b *InsertBuilder) Build() (sql string, args *ArgsBuilder) {
 		}
 	}
 
+	if b.comment != "" {
+		buf.WriteString("/* ")
+		buf.WriteString(b.comment)
+		buf.WriteString(" */")
+	}
+
 	sql = buf.String()
 	putBuffer(buf)
 	return

dml_select.go

@@ -122,6 +122,7 @@ type SelectBuilder struct {
 	havings  []string
 	groupbys []string
 	orderbys []orderby
+	comment  string
 	offset   int64
 	limit    int64
 	page     op.Paginator
@@ -472,6 +473,12 @@ func (b *SelectBuilder) Paginator(page op.Paginator) *SelectBuilder {
 	return b
 }
 
+// Comment set the comment, which will be appended to the end of the built SQL statement.
+func (b *SelectBuilder) Comment(comment string) *SelectBuilder {
+	b.comment = comment
+	return b
+}
+
 // SetDB sets the db.
 func (b *SelectBuilder) SetDB(db *DB) *SelectBuilder {
 	b.db = db
@@ -594,6 +601,12 @@ func (b *SelectBuilder) Build() (sql string, args *ArgsBuilder) {
 		buf.WriteString(BuildOper(args, b.page))
 	}
 
+	if b.comment != "" {
+		buf.WriteString("/* ")
+		buf.WriteString(b.comment)
+		buf.WriteString(" */")
+	}
+
 	sql = buf.String()
 	putBuffer(buf)
 	return

dml_update.go

@@ -46,6 +46,7 @@ func NewUpdateBuilder(table ...string) *UpdateBuilder {
 // UpdateBuilder is used to build the UPDATE statement.
 type UpdateBuilder struct {
 	db      *DB
+	comment string
 	utables []sqlTable
 	ftables []sqlTable
 	jtables []joinTable
@@ -143,6 +144,12 @@ func (b *UpdateBuilder) SetNamedArg(args ...sql.NamedArg) *UpdateBuilder {
 	return b
 }
 
+// Comment set the comment, which will be appended to the end of the built SQL statement.
+func (b *UpdateBuilder) Comment(comment string) *UpdateBuilder {
+	b.comment = comment
+	return b
+}
+
 // WhereNamedArgs is the same as Where, but uses the NamedArg as the EQUAL condition.
 func (b *UpdateBuilder) WhereNamedArgs(andArgs ...sql.NamedArg) *UpdateBuilder {
 	if b.wheres == nil {
@@ -250,6 +257,12 @@ func (b *UpdateBuilder) Build() (sql string, args *ArgsBuilder) {
 		buf.WriteString(BuildOper(args, op.And(b.wheres...)))
 	}
 
+	if b.comment != "" {
+		buf.WriteString("/* ")
+		buf.WriteString(b.comment)
+		buf.WriteString(" */")
+	}
+
 	sql = buf.String()
 	putBuffer(buf)
 	return