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java.lang.Objectorg.apache.derby.iapi.types.DataType
org.apache.derby.iapi.types.SQLChar
org.apache.derby.iapi.types.SQLVarchar
SQLVarchar 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, SQLVarchar can play a role in either a DataType/ValueRow or a OrderableDataType/KeyRow, interchangeably. SQLVarchar is mostly the same as SQLChar, so it is implemented as a subclass of SQLChar. Only those methods with different behavior are implemented here.
Field Summary |
Fields inherited from class org.apache.derby.iapi.types.SQLChar |
arg_passer, RETURN_SPACE_THRESHOLD, stream |
Fields inherited from interface org.apache.derby.iapi.types.StringDataValue |
BOTH, LEADING, TRAILING |
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 |
Constructor Summary | |
SQLVarchar()
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SQLVarchar(java.lang.String val)
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Method Summary | |
DataValueDescriptor |
getClone()
Clone this DataValueDescriptor. |
DataValueDescriptor |
getNewNull()
Get a new null value of the same type as this data value. |
int |
getTypeFormatId()
Return my format identifier. |
java.lang.String |
getTypeName()
Get the SQL name of the datatype |
protected int |
growBy()
returns the reasonable minimum amount by which the array can grow . |
void |
normalize(DataTypeDescriptor desiredType,
DataValueDescriptor source)
Normalization method - this method may be called when putting a value into a SQLVarchar, for example, when inserting into a SQLVarchar column. |
protected void |
normalize(DataTypeDescriptor desiredType,
java.lang.String sourceValue)
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int |
typePrecedence()
Each built-in type in JSQL has a precedence. |
Methods inherited from class org.apache.derby.iapi.types.DataType |
checkHostVariable, coalesce, dataTypeConversion, equals, flip, genericSetObject, getBytes, getNationalString, in, invalidFormat, isNotNull, isNullOp, outOfRange, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch |
Methods inherited from class java.lang.Object |
clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Methods inherited from interface org.apache.derby.iapi.types.DataValueDescriptor |
checkHostVariable, coalesce, getBytes, in, isNotNull, isNullOp, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue |
Constructor Detail |
public SQLVarchar()
public SQLVarchar(java.lang.String val)
Method Detail |
public java.lang.String getTypeName()
DataValueDescriptor
getTypeName
in interface DataValueDescriptor
getTypeName
in class SQLChar
public DataValueDescriptor getClone()
DataValueDescriptor
getClone
in interface DataValueDescriptor
getClone
in class SQLChar
DataValueDescriptor.getClone()
public DataValueDescriptor getNewNull()
DataValueDescriptor
getNewNull
in interface DataValueDescriptor
getNewNull
in class SQLChar
DataValueDescriptor.getNewNull()
public int getTypeFormatId()
getTypeFormatId
in interface TypedFormat
getTypeFormatId
in class SQLChar
TypedFormat.getTypeFormatId()
public void normalize(DataTypeDescriptor desiredType, DataValueDescriptor source) throws StandardException
normalize
in interface DataValueDescriptor
normalize
in class SQLChar
desiredType
- The type to normalize the source column tosource
- The value to normalize
StandardException
- Thrown for null into
non-nullable column, and for
truncation errorprotected void normalize(DataTypeDescriptor desiredType, java.lang.String sourceValue) throws StandardException
normalize
in class SQLChar
StandardException
public int typePrecedence()
DataValueDescriptor
typePrecedence
in interface DataValueDescriptor
typePrecedence
in class SQLChar
DataValueDescriptor.typePrecedence()
protected final int growBy()
growBy
in class SQLChar
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Built on Mon 2007-06-04 09:58:47+0400, from revision ??? | |||||||||
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