本文整理汇总了Golang中github.com/cockroachdb/cockroach/client.KeyValue.Exists方法的典型用法代码示例。如果您正苦于以下问题：Golang KeyValue.Exists方法的具体用法？Golang KeyValue.Exists怎么用？Golang KeyValue.Exists使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/cockroachdb/cockroach/client.KeyValue的用法示例。
在下文中一共展示了KeyValue.Exists方法的5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: unmarshalValue
func (n *scanNode) unmarshalValue(kv client.KeyValue) (parser.Datum, bool) {
kind, ok := n.colKind[n.colID]
if !ok {
n.err = fmt.Errorf("column-id \"%d\" does not exist", n.colID)
return nil, false
}
if kv.Exists() {
switch kind {
case ColumnType_INT:
return parser.DInt(kv.ValueInt()), true
case ColumnType_BOOL:
return parser.DBool(kv.ValueInt() != 0), true
case ColumnType_FLOAT:
return parser.DFloat(math.Float64frombits(uint64(kv.ValueInt()))), true
case ColumnType_STRING, ColumnType_BYTES:
return parser.DString(kv.ValueBytes()), true
case ColumnType_DATE:
var t time.Time
if err := t.UnmarshalBinary(kv.ValueBytes()); err != nil {
return nil, false
}
return parser.DDate{Time: t}, true
case ColumnType_TIMESTAMP:
var t time.Time
if err := t.UnmarshalBinary(kv.ValueBytes()); err != nil {
return nil, false
}
return parser.DTimestamp{Time: t}, true
case ColumnType_INTERVAL:
return parser.DInterval{Duration: time.Duration(kv.ValueInt())}, true
}
}
return parser.DNull, true
}示例2: unmarshalValue
func unmarshalValue(col structured.ColumnDescriptor, kv client.KeyValue) parser.Datum {
if kv.Exists() {
switch col.Type.Kind {
case structured.ColumnType_BIT, structured.ColumnType_INT:
return parser.DInt(kv.ValueInt())
case structured.ColumnType_FLOAT:
return parser.DFloat(math.Float64frombits(uint64(kv.ValueInt())))
case structured.ColumnType_CHAR, structured.ColumnType_TEXT,
structured.ColumnType_BLOB:
return parser.DString(kv.ValueBytes())
}
}
return parser.DNull
}示例3: unmarshalValue
func unmarshalValue(col structured.ColumnDescriptor, kv client.KeyValue) driver.Value {
if !kv.Exists() {
return nil
}
switch col.Type.Kind {
case structured.ColumnType_BIT, structured.ColumnType_INT:
return kv.ValueInt()
case structured.ColumnType_FLOAT:
return math.Float64frombits(uint64(kv.ValueInt()))
case structured.ColumnType_CHAR, structured.ColumnType_BINARY,
structured.ColumnType_TEXT, structured.ColumnType_BLOB:
// TODO(pmattis): The conversion to string isn't strictly necessary, but
// makes log messages more readable right now.
return string(kv.ValueBytes())
}
return kv.ValueBytes()
}示例4: unmarshalValue
func (n *scanNode) unmarshalValue(kv client.KeyValue) (parser.Datum, bool) {
kind, ok := n.colKind[n.colID]
if !ok {
n.err = fmt.Errorf("column-id \"%d\" does not exist", n.colID)
return nil, false
}
if kv.Exists() {
switch kind {
case ColumnType_INT:
return parser.DInt(kv.ValueInt()), true
case ColumnType_BOOL:
return parser.DBool(kv.ValueInt() != 0), true
case ColumnType_FLOAT:
return parser.DFloat(math.Float64frombits(uint64(kv.ValueInt()))), true
case ColumnType_STRING, ColumnType_BYTES:
return parser.DString(kv.ValueBytes()), true
}
}
return parser.DNull, true
}示例5: unmarshalValue
func unmarshalValue(col structured.ColumnDescriptor, kv client.KeyValue) sqlwire.Datum {
var d sqlwire.Datum
if !kv.Exists() {
return d
}
switch col.Type.Kind {
case structured.ColumnType_BIT, structured.ColumnType_INT:
tmp := kv.ValueInt()
d.IntVal = &tmp
case structured.ColumnType_FLOAT:
tmp := math.Float64frombits(uint64(kv.ValueInt()))
d.FloatVal = &tmp
case structured.ColumnType_CHAR, structured.ColumnType_TEXT,
structured.ColumnType_BLOB:
// TODO(pmattis): The conversion to string isn't strictly necessary, but
// makes log messages more readable right now.
tmp := string(kv.ValueBytes())
d.StringVal = &tmp
}
return d
}