Package org.apache.derby.iapi.sql
Interface ResultColumnDescriptor
- All Known Implementing Classes:
AllResultColumn
,GenericColumnDescriptor
,ResultColumn
public interface ResultColumnDescriptor
A ResultColumnDescriptor describes a result column in a ResultSet.
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Method Summary
Modifier and TypeMethodDescriptionint
Get the position of the Column.getName()
Returns the name of the Column.Get the name of the schema for the Column's base table, if any.Get the name of the underlying(base) table this column comes from, if any.getType()
Returns a DataTypeDescriptor for the column.boolean
Return true if this result column represents a generated column.boolean
Tell us if the column is an autoincrement column or not.boolean
Return true if the column is wirtable by a positioned update.
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Method Details
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getType
DataTypeDescriptor getType()Returns a DataTypeDescriptor for the column. This DataTypeDescriptor will not represent an actual value, it will only represent the type that all values in the column will have.- Returns:
- A DataTypeDescriptor describing the type of the column.
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getName
String getName()Returns the name of the Column.- Returns:
- A String containing the name of the column.
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getSourceSchemaName
String getSourceSchemaName()Get the name of the schema for the Column's base table, if any. Following example queries will all return APP (assuming user is in schema APP) select t.a from t select b.a from t as b select app.t.a from t- Returns:
- The name of the schema of the Column's base table. If the column is not in a schema (i.e. is a derived column), it returns NULL.
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getSourceTableName
String getSourceTableName()Get the name of the underlying(base) table this column comes from, if any. Following example queries will all return T select a from t select b.a from t as b select t.a from t- Returns:
- A String containing the name of the base table of the Column is in. If the column is not in a table (i.e. is a derived column), it returns NULL. The name of the Column's base table. If the column is not in a schema (i.e. is a derived column), it returns NULL.
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updatableByCursor
boolean updatableByCursor()Return true if the column is wirtable by a positioned update.- Returns:
- TRUE, if the column is a base column of a table and is writable by a positioned update.
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getColumnPosition
int getColumnPosition()Get the position of the Column. NOTE - position is 1-based.- Returns:
- An int containing the position of the Column within the table.
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isAutoincrement
boolean isAutoincrement()Tell us if the column is an autoincrement column or not.- Returns:
- TRUE, if the column is a base column of a table and is an autoincrement column.
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hasGenerationClause
boolean hasGenerationClause()Return true if this result column represents a generated column.
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