java.lang.Object
org.apache.derby.iapi.types.DataType
org.apache.derby.iapi.types.SQLBinary
org.apache.derby.iapi.types.SQLBit
org.apache.derby.iapi.types.SQLVarbit
- All Implemented Interfaces:
- BitDataValue, CloneableObject, ConcatableDataValue, DataValueDescriptor, java.io.Externalizable, org.apache.derby.iapi.services.io.Formatable, Orderable, java.io.Serializable, org.apache.derby.iapi.services.io.Storable, org.apache.derby.iapi.services.io.StreamStorable, org.apache.derby.iapi.services.io.TypedFormat, VariableSizeDataValue
- Direct Known Subclasses:
- SQLLongVarbit
- public class SQLVarbit
- extends SQLBit
SQLVarbit satisfies the DataValueDescriptor
interfaces (i.e., OrderableDataType). It implements a String holder,
e.g. for storing a column value; it can be specified
when constructed to not allow nulls. Nullability cannot be changed
after construction.
Because OrderableDataType is a subclass of DataType,
SQLVarbit can play a role in either a DataType/Value
or a OrderableDataType/KeyRow, interchangeably.
It is an extension of SQLVarbit and is virtually indistinguishable
other than normalization.
| Methods inherited from class org.apache.derby.iapi.types.SQLBinary |
charLength, checkHostVariable, cloneObject, compare, compare, concatenate, equals, estimateMemoryUsage, getBytes, getClone, getLength, getStream, getString, getValue, greaterOrEquals, greaterThan, hashCode, isNull, lessOrEquals, lessThan, loadStream, notEquals, objectNull, readExternal, readExternalFromArray, restoreToNull, returnStream, setFrom, setInto, setStream, setValue, setValue, substring, toString, writeExternal |
| Methods inherited from class org.apache.derby.iapi.types.DataType |
coalesce, dataTypeConversion, equals, flip, genericSetObject, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getNationalString, getShort, getTime, getTimestamp, in, invalidFormat, isNotNull, isNullOp, outOfRange, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch, typeToBigDecimal |
| Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor |
coalesce, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getShort, getTime, getTimestamp, in, isNotNull, isNullOp, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, typeToBigDecimal |
SQLVarbit
public SQLVarbit()
SQLVarbit
public SQLVarbit(byte[] val)
getTypeName
public java.lang.String getTypeName()
- Description copied from interface:
DataValueDescriptor
- Get the SQL name of the datatype
- Specified by:
getTypeName in interface DataValueDescriptor- Overrides:
getTypeName in class SQLBit
getNewNull
public DataValueDescriptor getNewNull()
- Description copied from interface:
DataValueDescriptor
- Get a new null value of the same type as this data value.
- Specified by:
getNewNull in interface DataValueDescriptor- Overrides:
getNewNull in class SQLBit
getTypeFormatId
public int getTypeFormatId()
- Return my format identifier.
- Specified by:
getTypeFormatId in interface org.apache.derby.iapi.services.io.TypedFormat- Overrides:
getTypeFormatId in class SQLBit
normalize
public void normalize(DataTypeDescriptor desiredType,
DataValueDescriptor source)
throws org.apache.derby.iapi.error.StandardException
- Normalization method - this method may be called when putting
a value into a SQLBit, for example, when inserting into a SQLBit
column. See NormalizeResultSet in execution.
- Specified by:
normalize in interface DataValueDescriptor- Overrides:
normalize in class SQLBit
setWidth
public DataValueDescriptor setWidth(int desiredWidth,
int desiredScale,
boolean errorOnTrunc)
throws org.apache.derby.iapi.error.StandardException
- Set the width of the to the desired value. Used
when CASTing. Ideally we'd recycle normalize(), but
the behavior is different (we issue a warning instead
of an error, and we aren't interested in nullability).
- Specified by:
setWidth in interface VariableSizeDataValue- Overrides:
setWidth in class SQLBit
typePrecedence
public int typePrecedence()
- Description copied from interface:
DataValueDescriptor
- Each built-in type in JSQL has a precedence. This precedence determines
how to do type promotion when using binary operators. For example, float
has a higher precedence than int, so when adding an int to a float, the
result type is float.
The precedence for some types is arbitrary. For example, it doesn't
matter what the precedence of the boolean type is, since it can't be
mixed with other types. But the precedence for the number types is
critical. The SQL standard requires that exact numeric types be
promoted to approximate numeric when one operator uses both. Also,
the precedence is arranged so that one will not lose precision when
promoting a type.
- Specified by:
typePrecedence in interface DataValueDescriptor- Overrides:
typePrecedence in class SQLBit
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