Golang ast.FuncCallExpr类代码示例

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本文整理汇总了Golang中github.com/pingcap/tidb/ast.FuncCallExpr类的典型用法代码示例。如果您正苦于以下问题：Golang FuncCallExpr类的具体用法？Golang FuncCallExpr怎么用？Golang FuncCallExpr使用的例子？那么恭喜您, 这里精选的类代码示例或许可以为您提供帮助。

在下文中一共展示了FuncCallExpr类的4个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于我们的系统推荐出更棒的Golang代码示例。

示例1: handleFuncCallExpr

func (v *typeInferrer) handleFuncCallExpr(x *ast.FuncCallExpr) {
	var (
		tp  *types.FieldType
		chs = charset.CharsetBin
	)
	switch x.FnName.L {
	case "abs", "ifnull", "nullif":
		tp = x.Args[0].GetType()
	case "pow", "power", "rand":
		tp = types.NewFieldType(mysql.TypeDouble)
	case "curdate", "current_date", "date":
		tp = types.NewFieldType(mysql.TypeDate)
	case "curtime", "current_time":
		tp = types.NewFieldType(mysql.TypeDuration)
		tp.Decimal = v.getFsp(x)
	case "current_timestamp":
		tp = types.NewFieldType(mysql.TypeDatetime)
	case "microsecond", "second", "minute", "hour", "day", "week", "month", "year",
		"dayofweek", "dayofmonth", "dayofyear", "weekday", "weekofyear", "yearweek",
		"found_rows", "length":
		tp = types.NewFieldType(mysql.TypeLonglong)
	case "now", "sysdate":
		tp = types.NewFieldType(mysql.TypeDatetime)
		tp.Decimal = v.getFsp(x)
	case "dayname", "version", "database", "user", "current_user",
		"concat", "concat_ws", "left", "lower", "repeat", "replace", "upper":
		tp = types.NewFieldType(mysql.TypeVarString)
		chs = v.defaultCharset
	case "connection_id":
		tp = types.NewFieldType(mysql.TypeLonglong)
		tp.Flag |= mysql.UnsignedFlag
	case "if":
		// TODO: fix this
		// See: https://dev.mysql.com/doc/refman/5.5/en/control-flow-functions.html#function_if
		// The default return type of IF() (which may matter when it is stored into a temporary table) is calculated as follows.
		// Expression	Return Value
		// expr2 or expr3 returns a string	string
		// expr2 or expr3 returns a floating-point value	floating-point
		// expr2 or expr3 returns an integer	integer
		tp = x.Args[1].GetType()
	default:
		tp = types.NewFieldType(mysql.TypeUnspecified)
	}
	// If charset is unspecified.
	if len(tp.Charset) == 0 {
		tp.Charset = chs
		cln := charset.CollationBin
		if chs != charset.CharsetBin {
			var err error
			cln, err = charset.GetDefaultCollation(chs)
			if err != nil {
				v.err = err
			}
		}
		tp.Collate = cln
	}
	x.SetType(tp)
}

开发者ID:yuanfeng0905，项目名称:tidb，代码行数:58，代码来源:typeinferer.go

示例2: funcCall

func (e *Evaluator) funcCall(v *ast.FuncCallExpr) bool {
	f, ok := Funcs[v.FnName.L]
	if !ok {
		e.err = ErrInvalidOperation.Gen("unknown function %s", v.FnName.O)
		return false
	}
	if len(v.Args) < f.MinArgs || (f.MaxArgs != -1 && len(v.Args) > f.MaxArgs) {
		e.err = ErrInvalidOperation.Gen("number of function arguments must in [%d, %d].", f.MinArgs, f.MaxArgs)
		return false
	}
	a := make([]types.Datum, len(v.Args))
	for i, arg := range v.Args {
		a[i] = *arg.GetDatum()
	}
	val, err := f.F(a, e.ctx)
	if err != nil {
		e.err = errors.Trace(err)
		return false
	}
	v.SetDatum(val)
	return true
}

开发者ID:yangxuanjia，项目名称:tidb，代码行数:22，代码来源:evaluator.go

示例3: funcCall

func (e *Evaluator) funcCall(v *ast.FuncCallExpr) bool {
	f, ok := builtin.Funcs[v.FnName.L]
	if !ok {
		e.err = ErrInvalidOperation.Gen("unknown function %s", v.FnName.O)
		return false
	}
	if len(v.Args) < f.MinArgs || (f.MaxArgs != -1 && len(v.Args) > f.MaxArgs) {
		e.err = ErrInvalidOperation.Gen("number of function arguments must in [%d, %d].", f.MinArgs, f.MaxArgs)
		return false
	}
	a := make([]interface{}, len(v.Args))
	for i, arg := range v.Args {
		a[i] = arg.GetValue()
	}
	argMap := make(map[interface{}]interface{})
	argMap[builtin.ExprEvalArgCtx] = e.ctx
	val, err := f.F(a, argMap)
	if err != nil {
		e.err = errors.Trace(err)
		return false
	}
	v.SetValue(val)
	return true
}

开发者ID:mrtoms，项目名称:tidb，代码行数:24，代码来源:evaluator.go

示例4: handleFuncCallExpr

func (v *typeInferrer) handleFuncCallExpr(x *ast.FuncCallExpr) {
	var (
		tp  *types.FieldType
		chs = charset.CharsetBin
	)
	switch x.FnName.L {
	case "abs", "ifnull", "nullif":
		tp = x.Args[0].GetType()
		// TODO: We should cover all types.
		if x.FnName.L == "abs" && tp.Tp == mysql.TypeDatetime {
			tp = types.NewFieldType(mysql.TypeDouble)
		}
	case "greatest":
		for _, arg := range x.Args {
			InferType(v.sc, arg)
		}
		if len(x.Args) > 0 {
			tp = x.Args[0].GetType()
			for i := 1; i < len(x.Args); i++ {
				mergeArithType(tp.Tp, x.Args[i].GetType().Tp)
			}
		}
	case "ceil", "ceiling":
		t := x.Args[0].GetType().Tp
		if t == mysql.TypeNull || t == mysql.TypeFloat || t == mysql.TypeDouble || t == mysql.TypeVarchar ||
			t == mysql.TypeTinyBlob || t == mysql.TypeMediumBlob || t == mysql.TypeLongBlob ||
			t == mysql.TypeBlob || t == mysql.TypeVarString || t == mysql.TypeString {
			tp = types.NewFieldType(mysql.TypeDouble)
		} else {
			tp = types.NewFieldType(mysql.TypeLonglong)
		}
	case "ln", "log", "log2", "log10":
		tp = types.NewFieldType(mysql.TypeDouble)
	case "pow", "power", "rand":
		tp = types.NewFieldType(mysql.TypeDouble)
	case "curdate", "current_date", "date":
		tp = types.NewFieldType(mysql.TypeDate)
	case "curtime", "current_time", "timediff":
		tp = types.NewFieldType(mysql.TypeDuration)
		tp.Decimal = v.getFsp(x)
	case "current_timestamp", "date_arith":
		tp = types.NewFieldType(mysql.TypeDatetime)
	case "microsecond", "second", "minute", "hour", "day", "week", "month", "year",
		"dayofweek", "dayofmonth", "dayofyear", "weekday", "weekofyear", "yearweek",
		"found_rows", "length", "extract", "locate":
		tp = types.NewFieldType(mysql.TypeLonglong)
	case "now", "sysdate":
		tp = types.NewFieldType(mysql.TypeDatetime)
		tp.Decimal = v.getFsp(x)
	case "from_unixtime":
		if len(x.Args) == 1 {
			tp = types.NewFieldType(mysql.TypeDatetime)
		} else {
			tp = types.NewFieldType(mysql.TypeVarString)
			chs = v.defaultCharset
		}
	case "str_to_date":
		tp = types.NewFieldType(mysql.TypeDatetime)
	case "dayname", "version", "database", "user", "current_user", "schema",
		"concat", "concat_ws", "left", "lcase", "lower", "repeat",
		"replace", "ucase", "upper", "convert", "substring",
		"substring_index", "trim", "ltrim", "rtrim", "reverse", "hex", "unhex", "date_format":
		tp = types.NewFieldType(mysql.TypeVarString)
		chs = v.defaultCharset
	case "strcmp", "isnull":
		tp = types.NewFieldType(mysql.TypeLonglong)
	case "connection_id":
		tp = types.NewFieldType(mysql.TypeLonglong)
		tp.Flag |= mysql.UnsignedFlag
	case "if":
		// TODO: fix this
		// See https://dev.mysql.com/doc/refman/5.5/en/control-flow-functions.html#function_if
		// The default return type of IF() (which may matter when it is stored into a temporary table) is calculated as follows.
		// Expression	Return Value
		// expr2 or expr3 returns a string	string
		// expr2 or expr3 returns a floating-point value	floating-point
		// expr2 or expr3 returns an integer	integer
		tp = x.Args[1].GetType()
	case "get_lock", "release_lock":
		tp = types.NewFieldType(mysql.TypeLonglong)
	default:
		tp = types.NewFieldType(mysql.TypeUnspecified)
	}
	// If charset is unspecified.
	if len(tp.Charset) == 0 {
		tp.Charset = chs
		cln := charset.CollationBin
		if chs != charset.CharsetBin {
			var err error
			cln, err = charset.GetDefaultCollation(chs)
			if err != nil {
				v.err = err
			}
		}
		tp.Collate = cln
	}
	x.SetType(tp)
}

开发者ID:pingcap，项目名称:tidb，代码行数:98，代码来源:typeinferer.go

注：本文中的github.com/pingcap/tidb/ast.FuncCallExpr类示例由纯净天空整理自Github/MSDocs等源码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。