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The ConcatableDataValue interface corresponds to the SQL 92 string value data type. It is implemented by datatypes that have a length, and can be concatenated. It is implemented by the character datatypes and the bit datatypes. The following methods are defined herein: charLength() The following is defined by the sub classes (bit and char) concatenate()
Field Summary |
Fields inherited from interface org.apache.derby.iapi.types.Orderable |
ORDER_OP_EQUALS, ORDER_OP_GREATEROREQUALS, ORDER_OP_GREATERTHAN, ORDER_OP_LESSOREQUALS, ORDER_OP_LESSTHAN |
Fields inherited from interface org.apache.derby.iapi.types.VariableSizeDataValue |
IGNORE_PRECISION |
Method Summary | |
NumberDataValue |
charLength(NumberDataValue result)
The SQL char_length() function. |
ConcatableDataValue |
substring(NumberDataValue start,
NumberDataValue length,
ConcatableDataValue result,
int maxLen)
substr() function matchs DB2 syntax and behaviour. |
Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor |
checkHostVariable, coalesce, compare, compare, equals, estimateMemoryUsage, getBigDecimal, getBoolean, getByte, getBytes, getClone, getDate, getDouble, getFloat, getInt, getLength, getLong, getNewNull, getObject, getShort, getStream, getString, getTime, getTimestamp, getTypeName, greaterOrEquals, greaterThan, in, isNotNull, isNullOp, lessOrEquals, lessThan, normalize, notEquals, readExternalFromArray, setInto, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValueFromResultSet, typePrecedence |
Methods inherited from interface org.apache.derby.iapi.services.io.Storable |
isNull, restoreToNull |
Methods inherited from interface java.io.Externalizable |
readExternal, writeExternal |
Methods inherited from interface org.apache.derby.iapi.services.io.TypedFormat |
getTypeFormatId |
Methods inherited from interface org.apache.derby.iapi.types.VariableSizeDataValue |
setWidth |
Method Detail |
public NumberDataValue charLength(NumberDataValue result) throws StandardException
result
- The result of a previous call to this method,
null if not called yet.
StandardException
- Thrown on errorpublic ConcatableDataValue substring(NumberDataValue start, NumberDataValue length, ConcatableDataValue result, int maxLen) throws StandardException
start
- Start of substrlength
- Length of substrresult
- The result of a previous call to this method,
null if not called yet.maxLen
- Maximum length of the result string
StandardException
- Thrown on error
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