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zhaoshichen 2019-06-09 11:01:03 +08:00
parent 61c85829d1
commit 80c59fd1e7
1 changed files with 3 additions and 1 deletions
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doc/wiki-cn/database-mysql.md
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@ -113,7 +113,7 @@ func (d *Dao) Close() {
## 单个查询
```go
// GetUserRole 用户角色
// GetDemo 用户角色
func (d *Dao) GetDemo(c context.Context, did int64) (demo int8, err error) {
err = d.db.QueryRow(c, _getDemoSQL, did).Scan(&demo)
if err != nil && err != sql.ErrNoRows {
@ -126,6 +126,8 @@ func (d *Dao) GetDemo(c context.Context, did int64) (demo int8, err error) {
db.QueryRow方法用于返回最多一条记录的查询，在QueryRow方法后使用Scan方法即可将mysql的返回值转换为Golang的数据类型。
当mysql查询不到对应数据时，会返回sql.ErrNoRows，如果不需处理，可以参考如上代码忽略此error。
## 批量查询
```go