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helper.go
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/
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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package expression
import (
"math"
"strings"
"time"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/parser/ast"
"github.com/pingcap/tidb/parser/mysql"
"github.com/pingcap/tidb/parser/terror"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/sessionctx/variable"
"github.com/pingcap/tidb/types"
driver "github.com/pingcap/tidb/types/parser_driver"
)
func boolToInt64(v bool) int64 {
if v {
return 1
}
return 0
}
// IsValidCurrentTimestampExpr returns true if exprNode is a valid CurrentTimestamp expression.
// Here `valid` means it is consistent with the given fieldType's Decimal.
func IsValidCurrentTimestampExpr(exprNode ast.ExprNode, fieldType *types.FieldType) bool {
fn, isFuncCall := exprNode.(*ast.FuncCallExpr)
if !isFuncCall || fn.FnName.L != ast.CurrentTimestamp {
return false
}
containsArg := len(fn.Args) > 0
// Fsp represents fractional seconds precision.
containsFsp := fieldType != nil && fieldType.Decimal > 0
var isConsistent bool
if containsArg {
v, ok := fn.Args[0].(*driver.ValueExpr)
isConsistent = ok && fieldType != nil && v.Datum.GetInt64() == int64(fieldType.Decimal)
}
return (containsArg && isConsistent) || (!containsArg && !containsFsp)
}
// GetTimeValue gets the time value with type tp.
func GetTimeValue(ctx sessionctx.Context, v interface{}, tp byte, fsp int8) (d types.Datum, err error) {
value := types.NewTime(types.ZeroCoreTime, tp, fsp)
sc := ctx.GetSessionVars().StmtCtx
switch x := v.(type) {
case string:
upperX := strings.ToUpper(x)
if upperX == strings.ToUpper(ast.CurrentTimestamp) {
defaultTime, err := getStmtTimestamp(ctx)
if err != nil {
return d, err
}
value.SetCoreTime(types.FromGoTime(defaultTime.Truncate(time.Duration(math.Pow10(9-int(fsp))) * time.Nanosecond)))
if tp == mysql.TypeTimestamp || tp == mysql.TypeDatetime {
err = value.ConvertTimeZone(time.Local, ctx.GetSessionVars().Location())
if err != nil {
return d, err
}
}
} else if upperX == types.ZeroDatetimeStr {
value, err = types.ParseTimeFromNum(sc, 0, tp, fsp)
terror.Log(err)
} else {
value, err = types.ParseTime(sc, x, tp, fsp)
if err != nil {
return d, err
}
}
case *driver.ValueExpr:
switch x.Kind() {
case types.KindString:
value, err = types.ParseTime(sc, x.GetString(), tp, fsp)
if err != nil {
return d, err
}
case types.KindInt64:
value, err = types.ParseTimeFromNum(sc, x.GetInt64(), tp, fsp)
if err != nil {
return d, err
}
case types.KindNull:
return d, nil
default:
return d, errDefaultValue
}
case *ast.FuncCallExpr:
if x.FnName.L == ast.CurrentTimestamp {
d.SetString(strings.ToUpper(ast.CurrentTimestamp), mysql.DefaultCollationName)
return d, nil
}
return d, errDefaultValue
case *ast.UnaryOperationExpr:
// support some expression, like `-1`
v, err := EvalAstExpr(ctx, x)
if err != nil {
return d, err
}
ft := types.NewFieldType(mysql.TypeLonglong)
xval, err := v.ConvertTo(ctx.GetSessionVars().StmtCtx, ft)
if err != nil {
return d, err
}
value, err = types.ParseTimeFromNum(sc, xval.GetInt64(), tp, fsp)
if err != nil {
return d, err
}
default:
return d, nil
}
d.SetMysqlTime(value)
return d, nil
}
// if timestamp session variable set, use session variable as current time, otherwise use cached time
// during one sql statement, the "current_time" should be the same
func getStmtTimestamp(ctx sessionctx.Context) (time.Time, error) {
failpoint.Inject("injectNow", func(val failpoint.Value) {
v := time.Unix(int64(val.(int)), 0)
failpoint.Return(v, nil)
})
now := time.Now()
if ctx == nil {
return now, nil
}
sessionVars := ctx.GetSessionVars()
timestampStr, err := variable.GetSessionOrGlobalSystemVar(sessionVars, "timestamp")
if err != nil {
return now, err
}
timestamp, err := types.StrToFloat(sessionVars.StmtCtx, timestampStr, false)
if err != nil {
return time.Time{}, err
}
seconds, fractionalSeconds := math.Modf(timestamp)
return time.Unix(int64(seconds), int64(fractionalSeconds*float64(time.Second))), nil
}