github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/sessionctx/forupdate/for_update_ctx.go (about)

     1  // Copyright 2015 PingCAP, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  // Package forupdate record information for "select ... for update" statement
    15  package forupdate
    16  
    17  import "github.com/insionng/yougam/libraries/pingcap/tidb/context"
    18  
    19  // A dummy type to avoid naming collision in context.
    20  type forupdateKeyType int
    21  
    22  // String defines a Stringer function for debugging and pretty printing.
    23  func (k forupdateKeyType) String() string {
    24  	return "for update"
    25  }
    26  
    27  // ForUpdateKey is used to retrive "select for update" statement information
    28  const ForUpdateKey forupdateKeyType = 0
    29  
    30  // SetForUpdate set "select for update" flag.
    31  func SetForUpdate(ctx context.Context) {
    32  	ctx.SetValue(ForUpdateKey, true)
    33  }