| Portability | portable |
|---|---|
| Stability | provisional |
| Maintainer | John Goerzen <jgoerzen@complete.org> |
Database.HDBC.ColTypes
Description
Definitions of, and utilities for, specifying what type of data is represented by a column.
Written by John Goerzen, jgoerzen@complete.org
- data SqlColDesc = SqlColDesc {
- colType :: SqlTypeId
- colSize :: Maybe Int
- colOctetLength :: Maybe Int
- colDecDigits :: Maybe Int
- colNullable :: Maybe Bool
- data SqlTypeId
- = SqlCharT
- | SqlVarCharT
- | SqlLongVarCharT
- | SqlWCharT
- | SqlWVarCharT
- | SqlWLongVarCharT
- | SqlDecimalT
- | SqlNumericT
- | SqlSmallIntT
- | SqlIntegerT
- | SqlRealT
- | SqlFloatT
- | SqlDoubleT
- | SqlBitT
- | SqlTinyIntT
- | SqlBigIntT
- | SqlBinaryT
- | SqlVarBinaryT
- | SqlLongVarBinaryT
- | SqlDateT
- | SqlTimeT
- | SqlTimeWithZoneT
- | SqlTimestampT
- | SqlTimestampWithZoneT
- | SqlUTCDateTimeT
- | SqlUTCTimeT
- | SqlIntervalT SqlInterval
- | SqlGUIDT
- | SqlUnknownT String
- data SqlInterval
- = SqlIntervalMonthT
- | SqlIntervalYearT
- | SqlIntervalYearToMonthT
- | SqlIntervalDayT
- | SqlIntervalHourT
- | SqlIntervalMinuteT
- | SqlIntervalSecondT
- | SqlIntervalDayToHourT
- | SqlIntervalDayToMinuteT
- | SqlIntervalDayToSecondT
- | SqlIntervalHourToMinuteT
- | SqlIntervalHourToSecondT
- | SqlIntervalMinuteToSecondT
Documentation
data SqlColDesc
The description of a column.
Fields are Nothing if the database backend cannot supply the requested information.
The colSize field works like this:
For character types, the maximum width of the column. For numeric types, the total number of digits allowed. See the ODBC manual for more.
The colOctetLength field is defined for character and binary types, and gives the number of bytes the column requires, regardless of encoding.
Constructors
| SqlColDesc | |
Fields
| |
Instances
data SqlTypeId
The type identifier for a given column.
This represents the type of data stored in the column in the underlying
SQL engine. It does not form the entire column type; see SqlColDesc for
that.
These types correspond mainly to those defined by ODBC.
Constructors
| SqlCharT | Fixed-width character strings |
| SqlVarCharT | Variable-width character strings |
| SqlLongVarCharT | Variable-width character strings, max length implementation dependant |
| SqlWCharT | Fixed-width Unicode strings |
| SqlWVarCharT | Variable-width Unicode strings |
| SqlWLongVarCharT | Variable-width Unicode strings, max length implementation dependant |
| SqlDecimalT | Signed exact values |
| SqlNumericT | Signed exact integer values |
| SqlSmallIntT | 16-bit integer values |
| SqlIntegerT | 32-bit integer values |
| SqlRealT | |
| SqlFloatT | Signed inexact floating-point values |
| SqlDoubleT | Signed inexact double-precision values |
| SqlBitT | A single bit |
| SqlTinyIntT | 8-bit integer values |
| SqlBigIntT | 64-bit integer values |
| SqlBinaryT | Fixed-length binary data |
| SqlVarBinaryT | Variable-length binary data |
| SqlLongVarBinaryT | Variable-length binary data, max length implementation dependant |
| SqlDateT | A date |
| SqlTimeT | A time, no timezone |
| SqlTimeWithZoneT | A time, with timezone |
| SqlTimestampT | Combined date and time, no timezone |
| SqlTimestampWithZoneT | Combined date and time, with timezone |
| SqlUTCDateTimeT | UTC date/time |
| SqlUTCTimeT | UTC time |
| SqlIntervalT SqlInterval | A time or date difference |
| SqlGUIDT | Global unique identifier |
| SqlUnknownT String | A type not represented here; implementation-specific information in the String |
data SqlInterval
The different types of intervals in SQL.
Constructors
| SqlIntervalMonthT | Difference in months |
| SqlIntervalYearT | Difference in years |
| SqlIntervalYearToMonthT | Difference in years+months |
| SqlIntervalDayT | Difference in days |
| SqlIntervalHourT | Difference in hours |
| SqlIntervalMinuteT | Difference in minutes |
| SqlIntervalSecondT | Difference in seconds |
| SqlIntervalDayToHourT | Difference in days+hours |
| SqlIntervalDayToMinuteT | Difference in days+minutes |
| SqlIntervalDayToSecondT | Difference in days+seconds |
| SqlIntervalHourToMinuteT | Difference in hours+minutes |
| SqlIntervalHourToSecondT | Difference in hours+seconds |
| SqlIntervalMinuteToSecondT | Difference in minutes+seconds |
Instances