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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,43 @@ | ||
package dao | ||
|
||
import ( | ||
"database/sql" | ||
"gim/pkg/db" | ||
"gim/pkg/gerrors" | ||
) | ||
|
||
const ( | ||
SeqObjectTypeUser = 1 // 用户 | ||
SeqObjectTypeGroup = 2 // 群组 | ||
) | ||
|
||
type seqDao struct{} | ||
|
||
var SeqDao = new(seqDao) | ||
|
||
// Incr 自增seq,并且获取自增后的值 | ||
func (*seqDao) Incr(objectType int, objectId int64) (int64, error) { | ||
tx := db.DB.Begin() | ||
defer tx.Rollback() | ||
|
||
var seq int64 | ||
err := db.DB.Raw("select seq from seq where object_type = ? and object_id = ? for update", objectType, objectId). | ||
Row().Scan(&seq) | ||
if err != nil && err != sql.ErrNoRows { | ||
return 0, gerrors.WrapError(err) | ||
} | ||
if err == sql.ErrNoRows { | ||
err = db.DB.Exec("insert into seq (object_type,object_id,seq) values (?,?,?)", objectType, objectId, seq+1).Error | ||
if err != nil { | ||
return 0, gerrors.WrapError(err) | ||
} | ||
} else { | ||
err = db.DB.Exec("update seq set seq = seq + 1 where object_type = ? and object_id = ?", objectType, objectId).Error | ||
if err != nil { | ||
return 0, gerrors.WrapError(err) | ||
} | ||
} | ||
|
||
tx.Commit() | ||
return seq + 1, nil | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,10 @@ | ||
package dao | ||
|
||
import ( | ||
"fmt" | ||
"testing" | ||
) | ||
|
||
func Test_seqDao_Incr(t *testing.T) { | ||
fmt.Println(SeqDao.Incr(1, 5)) | ||
} |
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