本文整理汇总了Golang中github.com/pingcap/tidb/ast.UnaryOperationExpr类的典型用法代码示例。如果您正苦于以下问题：Golang UnaryOperationExpr类的具体用法？Golang UnaryOperationExpr怎么用？Golang UnaryOperationExpr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UnaryOperationExpr类的3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，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: unaryOperation
func (v *typeInferrer) unaryOperation(x *ast.UnaryOperationExpr) {
switch x.Op {
case opcode.Not:
x.Type = types.NewFieldType(mysql.TypeLonglong)
case opcode.BitNeg:
x.Type = types.NewFieldType(mysql.TypeLonglong)
x.Type.Flag |= mysql.UnsignedFlag
case opcode.Plus:
x.Type = x.V.GetType()
case opcode.Minus:
x.Type = types.NewFieldType(mysql.TypeLonglong)
if x.V.GetType() != nil {
switch x.V.GetType().Tp {
case mysql.TypeString, mysql.TypeVarchar, mysql.TypeVarString, mysql.TypeDouble, mysql.TypeFloat:
x.Type.Tp = mysql.TypeDouble
case mysql.TypeNewDecimal:
x.Type.Tp = mysql.TypeNewDecimal
}
}
}
}示例2: unaryOperation
func (e *Evaluator) unaryOperation(u *ast.UnaryOperationExpr) bool {
defer func() {
if er := recover(); er != nil {
e.err = errors.Errorf("%v", er)
}
}()
aDatum := u.V.GetDatum()
if aDatum.IsNull() {
u.SetNull()
return true
}
switch op := u.Op; op {
case opcode.Not:
n, err := aDatum.ToBool()
if err != nil {
e.err = errors.Trace(err)
} else if n == 0 {
u.SetInt64(1)
} else {
u.SetInt64(0)
}
case opcode.BitNeg:
// for bit operation, we will use int64 first, then return uint64
n, err := aDatum.ToInt64()
if err != nil {
e.err = errors.Trace(err)
return false
}
u.SetUint64(uint64(^n))
case opcode.Plus:
switch aDatum.Kind() {
case types.KindInt64,
types.KindUint64,
types.KindFloat64,
types.KindFloat32,
types.KindMysqlDuration,
types.KindMysqlTime,
types.KindString,
types.KindMysqlDecimal,
types.KindBytes,
types.KindMysqlHex,
types.KindMysqlBit,
types.KindMysqlEnum,
types.KindMysqlSet:
u.SetDatum(*aDatum)
default:
e.err = ErrInvalidOperation
return false
}
case opcode.Minus:
switch aDatum.Kind() {
case types.KindInt64:
u.SetInt64(-aDatum.GetInt64())
case types.KindUint64:
u.SetInt64(-int64(aDatum.GetUint64()))
case types.KindFloat64:
u.SetFloat64(-aDatum.GetFloat64())
case types.KindFloat32:
u.SetFloat32(-aDatum.GetFloat32())
case types.KindMysqlDuration:
var to = new(mysql.MyDecimal)
var zero mysql.MyDecimal
mysql.DecimalSub(&zero, aDatum.GetMysqlDuration().ToNumber(), to)
u.SetMysqlDecimal(to)
case types.KindMysqlTime:
dec := aDatum.GetMysqlTime().ToNumber()
var zero, to mysql.MyDecimal
mysql.DecimalSub(&zero, dec, &to)
u.SetMysqlDecimal(&to)
case types.KindString, types.KindBytes:
f, err := types.StrToFloat(aDatum.GetString())
e.err = errors.Trace(err)
u.SetFloat64(-f)
case types.KindMysqlDecimal:
dec := aDatum.GetMysqlDecimal()
var zero, to mysql.MyDecimal
mysql.DecimalSub(&zero, dec, &to)
u.SetMysqlDecimal(&to)
case types.KindMysqlHex:
u.SetFloat64(-aDatum.GetMysqlHex().ToNumber())
case types.KindMysqlBit:
u.SetFloat64(-aDatum.GetMysqlBit().ToNumber())
case types.KindMysqlEnum:
u.SetFloat64(-aDatum.GetMysqlEnum().ToNumber())
case types.KindMysqlSet:
u.SetFloat64(-aDatum.GetMysqlSet().ToNumber())
default:
e.err = ErrInvalidOperation
return false
}
default:
e.err = ErrInvalidOperation
return false
}
return true
}示例3: unaryOperation
func (e *Evaluator) unaryOperation(u *ast.UnaryOperationExpr) bool {
defer func() {
if er := recover(); er != nil {
e.err = errors.Errorf("%v", er)
}
}()
a := u.V.GetValue()
a = types.RawData(a)
if a == nil {
u.SetValue(nil)
return true
}
switch op := u.Op; op {
case opcode.Not:
n, err := types.ToBool(a)
if err != nil {
e.err = errors.Trace(err)
} else if n == 0 {
u.SetValue(int64(1))
} else {
u.SetValue(int64(0))
}
case opcode.BitNeg:
// for bit operation, we will use int64 first, then return uint64
n, err := types.ToInt64(a)
if err != nil {
e.err = errors.Trace(err)
return false
}
u.SetValue(uint64(^n))
case opcode.Plus:
switch x := a.(type) {
case bool:
u.SetValue(boolToInt64(x))
case float32:
u.SetValue(+x)
case float64:
u.SetValue(+x)
case int:
u.SetValue(+x)
case int8:
u.SetValue(+x)
case int16:
u.SetValue(+x)
case int32:
u.SetValue(+x)
case int64:
u.SetValue(+x)
case uint:
u.SetValue(+x)
case uint8:
u.SetValue(+x)
case uint16:
u.SetValue(+x)
case uint32:
u.SetValue(+x)
case uint64:
u.SetValue(+x)
case mysql.Duration:
u.SetValue(x)
case mysql.Time:
u.SetValue(x)
case string:
u.SetValue(x)
case mysql.Decimal:
u.SetValue(x)
case []byte:
u.SetValue(x)
case mysql.Hex:
u.SetValue(x)
case mysql.Bit:
u.SetValue(x)
case mysql.Enum:
u.SetValue(x)
case mysql.Set:
u.SetValue(x)
default:
e.err = ErrInvalidOperation
return false
}
case opcode.Minus:
switch x := a.(type) {
case bool:
if x {
u.SetValue(int64(-1))
} else {
u.SetValue(int64(0))
}
case float32:
u.SetValue(-x)
case float64:
u.SetValue(-x)
case int:
u.SetValue(-x)
case int8:
u.SetValue(-x)
case int16:
u.SetValue(-x)
case int32:
u.SetValue(-x)
//.........这里部分代码省略.........