org.apache.derby.iapi.types
Class SQLBlob

java.lang.Object
  org.apache.derby.iapi.types.DataType
      org.apache.derby.iapi.types.SQLBinary
          org.apache.derby.iapi.types.SQLBlob

All Implemented Interfaces:

BitDataValue, CloneableObject, ConcatableDataValue, DataValueDescriptor, java.io.Externalizable, Formatable, Orderable, java.io.Serializable, Storable, StreamStorable, TypedFormat, VariableSizeDataValue

public class SQLBlob

extends SQLBinary

SQLBlob satisfies the DataValueDescriptor, interfaces (i.e., OrderableDataType). It uses the SQLLongVarbit implementation, which 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 LOB types are not orderable, we'll override those methods...

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.derby.iapi.types.SQLBinary

dataValue, PAD, stream, streamLength

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

SQLBlob()

SQLBlob(byte[] val)

Method Summary

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
void	normalize(DataTypeDescriptor desiredType, DataValueDescriptor source) Normalization method - this method may be called when putting a value into a SQLBit, for example, when inserting into a SQLBit column.
void	setValueFromResultSet(java.sql.ResultSet resultSet, int colNumber, boolean isNullable) Set the value based on the value for the specified DataValueDescriptor from the specified ResultSet.
DataValueDescriptor	setWidth(int desiredWidth, int desiredScale, boolean errorOnTrunc)
int	typePrecedence() Each built-in type in JSQL has a precedence.

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, setStream, setValue, setValue, substring, toString, writeExternal

Methods inherited from class org.apache.derby.iapi.types.DataType

coalesce, dataTypeConversion, equals, flip, genericSetObject, getBigDecimal, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getNationalString, getObject, getShort, getTime, getTimestamp, in, invalidFormat, isNotNull, isNullOp, outOfRange, setInto, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, 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

coalesce, getBigDecimal, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getObject, getShort, getTime, getTimestamp, in, isNotNull, isNullOp, setInto, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue

Constructor Detail

SQLBlob

public SQLBlob()

SQLBlob

public SQLBlob(byte[] val)

Method Detail

getTypeName

public java.lang.String getTypeName()

Description copied from interface: DataValueDescriptor

Get the SQL name of the datatype

Returns:

The SQL name of the datatype

getNewNull

public DataValueDescriptor getNewNull()

Description copied from interface: DataValueDescriptor

Get a new null value of the same type as this data value.

See Also:

DataValueDescriptor.getNewNull()

normalize

public void normalize(DataTypeDescriptor desiredType,
                      DataValueDescriptor source)
               throws 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 DataType

Parameters:

desiredType - The type to normalize the source column to

source - The value to normalize

Throws:

StandardException - Thrown for null into non-nullable column, and for truncation error

setWidth

public DataValueDescriptor setWidth(int desiredWidth,
                                    int desiredScale,
                                    boolean errorOnTrunc)
                             throws StandardException

Throws:

StandardException

getTypeFormatId

public int getTypeFormatId()

Return my format identifier.

Returns:

The identifier. (A UUID stuffed in an array of 16 bytes).

See Also:

TypedFormat.getTypeFormatId()

setValueFromResultSet

public void setValueFromResultSet(java.sql.ResultSet resultSet,
                                  int colNumber,
                                  boolean isNullable)
                           throws java.sql.SQLException

Description copied from interface: DataValueDescriptor

Set the value based on the value for the specified DataValueDescriptor from the specified ResultSet.

Parameters:

resultSet - The specified ResultSet.

colNumber - The 1-based column # into the resultSet.

isNullable - Whether or not the column is nullable (No need to call wasNull() if not)

Returns:

Nothing.

Throws:

java.sql.SQLException - Thrown on error

See Also:

DataValueDescriptor.setValueFromResultSet(java.sql.ResultSet, int, boolean)

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 DataType

Returns:

The precedence of this type.

See Also:

DataValueDescriptor.typePrecedence()