Package org.apache.derby.iapi.types
Class SQLVarbit
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:
Externalizable
,Serializable
,Comparable
,Formatable
,Storable
,StreamStorable
,TypedFormat
,BitDataValue
,ConcatableDataValue
,DataValueDescriptor
,Orderable
,VariableSizeDataValue
- Direct Known Subclasses:
SQLLongVarbit
SQLVarbit represents the SQL type VARCHAR FOR BIT DATA
It is an extension of SQLBit and is virtually indistinguishable
other than normalization.
- See Also:
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Field Summary
Fields inherited from class org.apache.derby.iapi.types.SQLBinary
_blobValue, dataValue, PAD, stream, streamValueLength
Fields inherited from interface org.apache.derby.iapi.types.DataValueDescriptor
UNKNOWN_LOGICAL_LENGTH
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
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescription(package private) int
Return max memory usage for a SQL VarbitGet a new null value of the same type as this data value.int
Return my format identifier.Get the SQL name of the datatypevoid
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
setWidth
(int desiredWidth, int desiredScale, boolean errorOnTrunc) Set the width of the to the desired value.int
Each built-in type in JSQL has a precedence.Methods inherited from class org.apache.derby.iapi.types.SQLBit
getObject, setObject, setValueFromResultSet
Methods inherited from class org.apache.derby.iapi.types.SQLBinary
charLength, checkHostVariable, cloneHolder, cloneValue, compare, compare, concatenate, equals, estimateMemoryUsage, getBytes, getLength, getStream, getString, getTraceString, getValue, greaterOrEquals, greaterThan, hashCode, isNull, lessOrEquals, lessThan, loadStream, notEquals, objectNull, readExternal, restoreToNull, returnStream, setFrom, setInto, setStream, setValue, setValue, setValue, substring, toString, truncate, writeExternal
Methods inherited from class org.apache.derby.iapi.types.DataType
coalesce, compare, compare, compareTo, dataTypeConversion, equals, flip, genericSetObject, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getShort, getTime, getTimestamp, getTypeName, hasStream, in, invalidFormat, isNotNull, isNullOp, outOfRange, readExternalFromArray, recycle, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, throwLangSetMismatch, throwLangSetMismatch, typeToBigDecimal
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, compare, compare, getBoolean, getByte, getDate, getDouble, getFloat, getInt, getLong, getShort, getTime, getTimestamp, hasStream, in, isNotNull, isNullOp, readExternalFromArray, recycle, setBigDecimal, setInto, setObjectForCast, setToNull, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, setValue, typeToBigDecimal
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Constructor Details
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SQLVarbit
public SQLVarbit() -
SQLVarbit
public SQLVarbit(byte[] val)
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Method Details
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getTypeName
Description copied from interface:DataValueDescriptor
Get the SQL name of the datatype- Specified by:
getTypeName
in interfaceDataValueDescriptor
- Overrides:
getTypeName
in classSQLBit
- Returns:
- The SQL name of the datatype
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getMaxMemoryUsage
int getMaxMemoryUsage()Return max memory usage for a SQL Varbit- Overrides:
getMaxMemoryUsage
in classSQLBit
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getNewNull
Description copied from interface:DataValueDescriptor
Get a new null value of the same type as this data value.- Specified by:
getNewNull
in interfaceDataValueDescriptor
- Overrides:
getNewNull
in classSQLBit
- See Also:
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getTypeFormatId
public int getTypeFormatId()Return my format identifier.- Specified by:
getTypeFormatId
in interfaceTypedFormat
- Overrides:
getTypeFormatId
in classSQLBit
- Returns:
- The identifier. (A UUID stuffed in an array of 16 bytes).
- See Also:
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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 interfaceDataValueDescriptor
- Overrides:
normalize
in classSQLBit
- Parameters:
desiredType
- The type to normalize the source column tosource
- The value to normalize- Throws:
StandardException
- Thrown for null into non-nullable column, and for truncation error
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setWidth
public void setWidth(int desiredWidth, int desiredScale, boolean errorOnTrunc) throws 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 interfaceVariableSizeDataValue
- Overrides:
setWidth
in classSQLBit
- Parameters:
desiredWidth
- the desired lengthdesiredScale
- the desired scale (ignored)errorOnTrunc
- throw error on truncation- Throws:
StandardException
- Thrown on non-zero truncation if errorOnTrunc is true
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typePrecedence
public int typePrecedence()Description copied from class:DataType
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 interfaceDataValueDescriptor
- Overrides:
typePrecedence
in classSQLBit
- Returns:
- The precedence of this type.
- See Also:
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