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gitea/vendor/github.com/pingcap/tidb/evaluator/builtin_info.go

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Go

// Copyright 2013 The ql Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSES/QL-LICENSE file.
// Copyright 2015 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
package evaluator
import (
"github.com/juju/errors"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx/db"
"github.com/pingcap/tidb/sessionctx/variable"
)
// See: https://dev.mysql.com/doc/refman/5.7/en/information-functions.html
func builtinDatabase(args []interface{}, ctx context.Context) (v interface{}, err error) {
d := db.GetCurrentSchema(ctx)
if d == "" {
return nil, nil
}
return d, nil
}
func builtinFoundRows(arg []interface{}, ctx context.Context) (interface{}, error) {
data := variable.GetSessionVars(ctx)
if data == nil {
return nil, errors.Errorf("Missing session variable when evalue builtin")
}
return data.FoundRows, nil
}
// See: https://dev.mysql.com/doc/refman/5.7/en/information-functions.html#function_current-user
// TODO: The value of CURRENT_USER() can differ from the value of USER(). We will finish this after we support grant tables.
func builtinCurrentUser(args []interface{}, ctx context.Context) (v interface{}, err error) {
data := variable.GetSessionVars(ctx)
if data == nil {
return nil, errors.Errorf("Missing session variable when evalue builtin")
}
return data.User, nil
}
func builtinUser(args []interface{}, ctx context.Context) (v interface{}, err error) {
data := variable.GetSessionVars(ctx)
if data == nil {
return nil, errors.Errorf("Missing session variable when evalue builtin")
}
return data.User, nil
}
func builtinConnectionID(args []interface{}, ctx context.Context) (v interface{}, err error) {
data := variable.GetSessionVars(ctx)
if data == nil {
return nil, errors.Errorf("Missing session variable when evalue builtin")
}
return data.ConnectionID, nil
}
func builtinVersion(args []interface{}, ctx context.Context) (v interface{}, err error) {
return mysql.ServerVersion, nil
}