public Class SQLLongvarchar

Overrides org.apache.derby.iapi.types.SQLVarchar.cloneValue.

Implements org.apache.derby.iapi.types.DataValueDescriptor.cloneValue.

Doc from org.apache.derby.iapi.types.DataValueDescriptor.cloneValue.

Clone this DataValueDescriptor. Results in a new object that has the same value as this but can be modified independently.

Even though the objects can be modified independently regardless of the value of forceMaterialization, both the clone and the original may be dependent on the store state if forceMaterialization is set to false. An example is if you need to access the value you just read using cloneValue after the current transaction has ended, or after the source result set has been closed.

Parameters

forceMaterialization:boolean

any streams representing the data value will be materialized if true, the data value will be kept as a stream if possible if false

Returns:DataValueDescriptor

A clone of the DataValueDescriptor with the same initial value as this.

See Also

DataValueDescriptor#cloneValue

Overrides org.apache.derby.iapi.types.SQLChar.concatenate.

Implements org.apache.derby.iapi.types.StringDataValue.concatenate.

Doc from org.apache.derby.iapi.types.StringDataValue.concatenate.

The SQL concatenation '||' operator.

Parameters

leftOperand:StringDataValue

String on the left hand side of '||'

rightOperand:StringDataValue

String on the right hand side of '||'

result:StringDataValue

The result of a previous call to this method, null if not called yet.

Returns:StringDataValue

A ConcatableDataValue containing the result of the '||'

Exceptions

StandardException:

Thrown on error

See Also

StringDataValue#concatenate

Overrides org.apache.derby.iapi.types.SQLVarchar.getNewNull.

Implements org.apache.derby.iapi.types.DataValueDescriptor.getNewNull.

Doc from org.apache.derby.iapi.types.DataValueDescriptor.getNewNull.

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

See Also

DataValueDescriptor#getNewNull

Overrides org.apache.derby.iapi.types.SQLVarchar.getTypeFormatId.

Implements org.apache.derby.iapi.services.io.TypedFormat.getTypeFormatId.

Return my format identifier.

Returns:int

Doc from org.apache.derby.iapi.services.io.TypedFormat.getTypeFormatId.

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

See Also

org.apache.derby.iapi.services.io.TypedFormat#getTypeFormatId

Overrides org.apache.derby.iapi.types.SQLVarchar.getTypeName.

Implements org.apache.derby.iapi.types.DataValueDescriptor.getTypeName.

Doc from org.apache.derby.iapi.types.DataValueDescriptor.getTypeName.

Get the SQL name of the datatype

Returns:String

The SQL name of the datatype

Overrides org.apache.derby.iapi.types.SQLVarchar.getValue.

Implements org.apache.derby.iapi.types.StringDataValue.getValue.

Doc from org.apache.derby.iapi.types.StringDataValue.getValue.

Gets either SQLChar/SQLVarchar/SQLLongvarchar/SQLClob(base classes) or CollatorSQLChar/CollatorSQLVarchar/CollatorSQLLongvarch/CollatorSQLClob (subclasses). Whether this method returns the base class or the subclass depends on the value of the RuleBasedCollator. If RuleBasedCollator is null, then the object returned would be baseclass otherwise it would be subcalss.

See Also

StringDataValue#getValue(RuleBasedCollator)

Overrides org.apache.derby.iapi.types.SQLVarchar.typePrecedence.

Implements org.apache.derby.iapi.types.DataValueDescriptor.typePrecedence.

Doc from org.apache.derby.iapi.types.DataValueDescriptor.typePrecedence.

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.

Returns:int

The precedence of this type.