forked from ClickHouse/clickhouse-go
/
column.go
142 lines (137 loc) · 2.66 KB
/
column.go
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package column
import (
"fmt"
"reflect"
"strings"
"time"
"github.com/kshvakov/clickhouse/lib/binary"
)
type Column interface {
Name() string
CHType() string
ScanType() reflect.Type
Read(*binary.Decoder) (interface{}, error)
Write(*binary.Encoder, interface{}) error
defaultValue() interface{}
}
func Factory(name, chType string, timezone *time.Location) (Column, error) {
switch chType {
case "Int8":
return &Int8{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[int8(0)],
},
}, nil
case "Int16":
return &Int16{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[int16(0)],
},
}, nil
case "Int32":
return &Int32{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[int32(0)],
},
}, nil
case "Int64":
return &Int64{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[int64(0)],
},
}, nil
case "UInt8":
return &UInt8{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[uint8(0)],
},
}, nil
case "UInt16":
return &UInt16{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[uint16(0)],
},
}, nil
case "UInt32":
return &UInt32{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[uint32(0)],
},
}, nil
case "UInt64":
return &UInt64{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[uint64(0)],
},
}, nil
case "Float32":
return &Float32{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[float32(0)],
},
}, nil
case "Float64":
return &Float64{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[float64(0)],
},
}, nil
case "String":
return &String{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[string("")],
},
}, nil
case "UUID":
return &UUID{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[string("")],
},
}, nil
case "Date", "DateTime":
return &DateTime{
base: base{
name: name,
chType: chType,
valueOf: baseTypes[time.Time{}],
},
IsFull: chType == "DateTime",
Timezone: timezone,
}, nil
}
switch {
case strings.HasPrefix(chType, "Array"):
return parseArray(name, chType, timezone)
case strings.HasPrefix(chType, "Nullable"):
return parseNullable(name, chType, timezone)
case strings.HasPrefix(chType, "FixedString"):
return parseFixedString(name, chType)
case strings.HasPrefix(chType, "Enum8"), strings.HasPrefix(chType, "Enum16"):
return parseEnum(name, chType)
}
return nil, fmt.Errorf("column: unhandled type %v", chType)
}