forked from pingcap/tidb
/
helper.go
161 lines (144 loc) · 3.81 KB
/
helper.go
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// Copyright 2016 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 expression
import (
"strings"
"time"
"github.com/juju/errors"
"github.com/pingcap/tidb/ast"
"github.com/pingcap/tidb/context"
"github.com/pingcap/tidb/mysql"
"github.com/pingcap/tidb/sessionctx/varsutil"
"github.com/pingcap/tidb/util/types"
)
const (
zeroI64 int64 = 0
oneI64 int64 = 1
)
func boolToInt64(v bool) int64 {
if v {
return int64(1)
}
return int64(0)
}
var (
// CurrentTimestamp is the keyword getting default value for datetime and timestamp type.
CurrentTimestamp = "CURRENT_TIMESTAMP"
currentTimestampL = "current_timestamp"
// ZeroTimestamp shows the zero datetime and timestamp.
ZeroTimestamp = "0000-00-00 00:00:00"
)
var (
errDefaultValue = errors.New("invalid default value")
)
// GetTimeValue gets the time value with type tp.
func GetTimeValue(ctx context.Context, v interface{}, tp byte, fsp int) (types.Datum, error) {
return getTimeValue(ctx, v, tp, fsp)
}
func getTimeValue(ctx context.Context, v interface{}, tp byte, fsp int) (d types.Datum, err error) {
value := types.Time{
Type: tp,
Fsp: fsp,
}
defaultTime, err := getSystemTimestamp(ctx)
if err != nil {
return d, errors.Trace(err)
}
switch x := v.(type) {
case string:
upperX := strings.ToUpper(x)
if upperX == CurrentTimestamp {
value.Time = types.FromGoTime(defaultTime)
} else if upperX == ZeroTimestamp {
value, _ = types.ParseTimeFromNum(0, tp, fsp)
} else {
value, err = types.ParseTime(x, tp, fsp)
if err != nil {
return d, errors.Trace(err)
}
}
case *ast.ValueExpr:
switch x.Kind() {
case types.KindString:
value, err = types.ParseTime(x.GetString(), tp, fsp)
if err != nil {
return d, errors.Trace(err)
}
case types.KindInt64:
value, err = types.ParseTimeFromNum(x.GetInt64(), tp, fsp)
if err != nil {
return d, errors.Trace(err)
}
case types.KindNull:
return d, nil
default:
return d, errors.Trace(errDefaultValue)
}
case *ast.FuncCallExpr:
if x.FnName.L == currentTimestampL {
d.SetString(CurrentTimestamp)
return d, nil
}
return d, errors.Trace(errDefaultValue)
case *ast.UnaryOperationExpr:
// support some expression, like `-1`
v, err := EvalAstExpr(x, ctx)
if err != nil {
return d, errors.Trace(err)
}
ft := types.NewFieldType(mysql.TypeLonglong)
xval, err := v.ConvertTo(ctx.GetSessionVars().StmtCtx, ft)
if err != nil {
return d, errors.Trace(err)
}
value, err = types.ParseTimeFromNum(xval.GetInt64(), tp, fsp)
if err != nil {
return d, errors.Trace(err)
}
default:
return d, nil
}
d.SetMysqlTime(value)
return d, nil
}
// IsCurrentTimeExpr returns whether e is CurrentTimeExpr.
func IsCurrentTimeExpr(e ast.ExprNode) bool {
x, ok := e.(*ast.FuncCallExpr)
if !ok {
return false
}
return x.FnName.L == currentTimestampL
}
func getSystemTimestamp(ctx context.Context) (time.Time, error) {
value := time.Now()
if ctx == nil {
return value, nil
}
// check whether use timestamp variable
sessionVars := ctx.GetSessionVars()
val, err := varsutil.GetSessionSystemVar(sessionVars, "timestamp")
if err != nil {
return value, errors.Trace(err)
}
if val != "" {
timestamp, err := types.StrToInt(sessionVars.StmtCtx, val)
if err != nil {
return time.Time{}, errors.Trace(err)
}
if timestamp <= 0 {
return value, nil
}
return time.Unix(timestamp, 0), nil
}
return value, nil
}