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159 lines
4.4 KiB
159 lines
4.4 KiB
// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expression
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import (
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"math"
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"strings"
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"time"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/parser/terror"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/variable"
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"github.com/pingcap/tidb/types"
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driver "github.com/pingcap/tidb/types/parser_driver"
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)
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func boolToInt64(v bool) int64 {
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if v {
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return 1
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}
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return 0
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}
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// IsValidCurrentTimestampExpr returns true if exprNode is a valid CurrentTimestamp expression.
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// Here `valid` means it is consistent with the given fieldType's Decimal.
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func IsValidCurrentTimestampExpr(exprNode ast.ExprNode, fieldType *types.FieldType) bool {
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fn, isFuncCall := exprNode.(*ast.FuncCallExpr)
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if !isFuncCall || fn.FnName.L != ast.CurrentTimestamp {
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return false
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}
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containsArg := len(fn.Args) > 0
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// Fsp represents fractional seconds precision.
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containsFsp := fieldType != nil && fieldType.Decimal > 0
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var isConsistent bool
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if containsArg {
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v, ok := fn.Args[0].(*driver.ValueExpr)
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isConsistent = ok && fieldType != nil && v.Datum.GetInt64() == int64(fieldType.Decimal)
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}
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return (containsArg && isConsistent) || (!containsArg && !containsFsp)
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}
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// GetTimeValue gets the time value with type tp.
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func GetTimeValue(ctx sessionctx.Context, v interface{}, tp byte, fsp int8) (d types.Datum, err error) {
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value := types.NewTime(types.ZeroCoreTime, tp, fsp)
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sc := ctx.GetSessionVars().StmtCtx
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switch x := v.(type) {
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case string:
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upperX := strings.ToUpper(x)
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if upperX == strings.ToUpper(ast.CurrentTimestamp) {
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defaultTime, err := getStmtTimestamp(ctx)
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if err != nil {
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return d, err
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}
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value.SetCoreTime(types.FromGoTime(defaultTime.Truncate(time.Duration(math.Pow10(9-int(fsp))) * time.Nanosecond)))
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if tp == mysql.TypeTimestamp || tp == mysql.TypeDatetime {
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err = value.ConvertTimeZone(time.Local, ctx.GetSessionVars().Location())
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if err != nil {
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return d, err
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}
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}
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} else if upperX == types.ZeroDatetimeStr {
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value, err = types.ParseTimeFromNum(sc, 0, tp, fsp)
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terror.Log(err)
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} else {
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value, err = types.ParseTime(sc, x, tp, fsp)
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if err != nil {
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return d, err
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}
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}
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case *driver.ValueExpr:
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switch x.Kind() {
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case types.KindString:
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value, err = types.ParseTime(sc, x.GetString(), tp, fsp)
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if err != nil {
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return d, err
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}
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case types.KindInt64:
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value, err = types.ParseTimeFromNum(sc, x.GetInt64(), tp, fsp)
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if err != nil {
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return d, err
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}
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case types.KindNull:
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return d, nil
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default:
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return d, errDefaultValue
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}
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case *ast.FuncCallExpr:
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if x.FnName.L == ast.CurrentTimestamp {
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d.SetString(strings.ToUpper(ast.CurrentTimestamp), mysql.DefaultCollationName)
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return d, nil
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}
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return d, errDefaultValue
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case *ast.UnaryOperationExpr:
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// support some expression, like `-1`
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v, err := EvalAstExpr(ctx, x)
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if err != nil {
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return d, err
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}
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ft := types.NewFieldType(mysql.TypeLonglong)
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xval, err := v.ConvertTo(ctx.GetSessionVars().StmtCtx, ft)
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if err != nil {
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return d, err
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}
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value, err = types.ParseTimeFromNum(sc, xval.GetInt64(), tp, fsp)
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if err != nil {
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return d, err
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}
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default:
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return d, nil
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}
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d.SetMysqlTime(value)
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return d, nil
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}
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// if timestamp session variable set, use session variable as current time, otherwise use cached time
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// during one sql statement, the "current_time" should be the same
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func getStmtTimestamp(ctx sessionctx.Context) (time.Time, error) {
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now := time.Now()
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if ctx == nil {
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return now, nil
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}
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sessionVars := ctx.GetSessionVars()
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timestampStr, err := variable.GetSessionSystemVar(sessionVars, "timestamp")
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if err != nil {
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return now, err
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}
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if timestampStr != "" {
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timestamp, err := types.StrToInt(sessionVars.StmtCtx, timestampStr, false)
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if err != nil {
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return time.Time{}, err
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}
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if timestamp <= 0 {
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return now, nil
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}
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return time.Unix(timestamp, 0), nil
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}
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stmtCtx := ctx.GetSessionVars().StmtCtx
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return stmtCtx.GetNowTsCached(), nil
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}
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