name correction: QueryBuilder instead of QueryWriter

@@ -17,16 +17,16 @@ package orm
 import "errors"
 
 type QueryBuilder interface {
-	Select(fields ...string) QueryWriter
-	From(tables ...string) QueryWriter
-	Where(cond string) QueryWriter
-	LimitOffset(limit int, offset int) QueryWriter
-	InnerJoin(table string) QueryWriter
-	LeftJoin(table string) QueryWriter
-	On(cond string) QueryWriter
-	And(cond string) QueryWriter
-	Or(cond string) QueryWriter
-	In(vals ...string) QueryWriter
+	Select(fields ...string) QueryBuilder
+	From(tables ...string) QueryBuilder
+	Where(cond string) QueryBuilder
+	LimitOffset(limit int, offset int) QueryBuilder
+	InnerJoin(table string) QueryBuilder
+	LeftJoin(table string) QueryBuilder
+	On(cond string) QueryBuilder
+	And(cond string) QueryBuilder
+	Or(cond string) QueryBuilder
+	In(vals ...string) QueryBuilder
 	Subquery(query string, rename string) string
 	String() string
 }

@@ -23,54 +23,54 @@ type MySQLQueryBuilder struct {
 	QueryString []string
 }
 
-func (qw *MySQLQueryBuilder) Select(fields ...string) QueryWriter {
+func (qw *MySQLQueryBuilder) Select(fields ...string) QueryBuilder {
 	segment := fmt.Sprintf("SELECT %s", strings.Join(fields, ", "))
 	qw.QueryString = append(qw.QueryString, segment)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) From(tables ...string) QueryWriter {
+func (qw *MySQLQueryBuilder) From(tables ...string) QueryBuilder {
 	segment := fmt.Sprintf("FROM %s", strings.Join(tables, ", "))
 	qw.QueryString = append(qw.QueryString, segment)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) Where(cond string) QueryWriter {
+func (qw *MySQLQueryBuilder) Where(cond string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "WHERE "+cond)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) LimitOffset(limit int, offset int) QueryWriter {
+func (qw *MySQLQueryBuilder) LimitOffset(limit int, offset int) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, fmt.Sprintf("LIMIT %d OFFSET %d", limit, offset))
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) InnerJoin(table string) QueryWriter {
+func (qw *MySQLQueryBuilder) InnerJoin(table string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "INNER JOIN "+table)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) LeftJoin(table string) QueryWriter {
+func (qw *MySQLQueryBuilder) LeftJoin(table string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "LEFT JOIN "+table)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) On(cond string) QueryWriter {
+func (qw *MySQLQueryBuilder) On(cond string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "ON "+cond)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) And(cond string) QueryWriter {
+func (qw *MySQLQueryBuilder) And(cond string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "AND "+cond)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) Or(cond string) QueryWriter {
+func (qw *MySQLQueryBuilder) Or(cond string) QueryBuilder {
 	qw.QueryString = append(qw.QueryString, "OR "+cond)
 	return qw
 }
 
-func (qw *MySQLQueryBuilder) In(vals ...string) QueryWriter {
+func (qw *MySQLQueryBuilder) In(vals ...string) QueryBuilder {
 	segment := fmt.Sprintf("IN (%s)", strings.Join(vals, ", "))
 	qw.QueryString = append(qw.QueryString, segment)
 	return qw