github.com/insionng/yougam@v0.0.0-20170714101924-2bc18d833463/libraries/pingcap/tidb/sessionctx/db/db.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 db
    15  
    16  import (
    17  	"github.com/insionng/yougam/libraries/pingcap/tidb/context"
    18  )
    19  
    20  // currentDBKeyType is a dummy type to avoid naming collision in context.
    21  type currentDBKeyType int
    22  
    23  // String defines a Stringer function for debugging and pretty printing.
    24  func (k currentDBKeyType) String() string {
    25  	return "current_db"
    26  }
    27  
    28  const currentDBKey currentDBKeyType = 0
    29  
    30  // BindCurrentSchema saves parameter schema as current schema name value into context.
    31  func BindCurrentSchema(ctx context.Context, schema string) {
    32  	ctx.SetValue(currentDBKey, schema)
    33  }
    34  
    35  // GetCurrentSchema gets current schema name from context.
    36  func GetCurrentSchema(ctx context.Context) string {
    37  	v, ok := ctx.Value(currentDBKey).(string)
    38  	if !ok {
    39  		return ""
    40  	}
    41  	return v
    42  }