Package com.mckoi.database
Class DefaultDataTable
java.lang.Object
com.mckoi.database.Table
com.mckoi.database.AbstractDataTable
com.mckoi.database.DefaultDataTable
- All Implemented Interfaces:
RootTable
,TableDataSource
- Direct Known Subclasses:
DataTable
,FunctionTable
,TemporaryTable
This represents a default implementation of a DataTable. It encapsulates
information that is core to all DataTable objects. That is,
The table name, The description of the table fields, A set of SelectableScheme objects to describe row relations, A counter for the number of rows in the table.
There are two classes that extend this object. DataTable which is a DataTable that is a direct mapping to an internal table stored in the Database files. And TemporaryTable that contains information generated on the fly by the DBMS.
- Author:
- Tobias Downer
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Field Summary
FieldsFields inherited from class com.mckoi.database.Table
DEBUG_QUERY
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Method Summary
Modifier and TypeMethodDescriptionprotected void
Blanks all the column schemes in the table to an initial state.protected void
blankSelectableSchemes
(int type) Blanks all the column schemes in this table to a specific type of scheme.protected void
clearColumnScheme
(int column) Clears the SelectableScheme information for the given column.int
Given a fully qualified variable field name, ie.int
Returns the number of columns in the table.Returns the Database object this table is part of.getResolvedVariable
(int column) Returns a fully qualified Variable object that represents the name of the column at the given index.protected SelectableScheme
getRootColumnScheme
(int column) Returns the SelectableScheme for the given column.int
Returns the number of rows stored in the table.Methods inherited from class com.mckoi.database.AbstractDataTable
getTableName, toString, typeEquals
Methods inherited from class com.mckoi.database.Table
all, allColumnMatchesValue, any, columnContainsCell, columnContainsValue, columnMatchesValue, columnMerge, compareCells, Debug, distinct, distinct, dumpTo, emptySelect, exhaustiveSelect, fastFindFieldName, getCellContents, getColumnDefAt, getColumnScheme, getDataTableDef, getFirstCellContent, getFirstCellContent, getLastCellContent, getLastCellContent, getSingleCellContent, getSingleCellContent, getSystem, getTableAccessState, getTTypeForColumn, getTTypeForColumn, hasRootsLocked, join, lockRoot, orderByColumn, orderByColumn, orderByColumn, orderByColumns, orderedRowList, outside, printGraph, rangeSelect, rowEnumeration, selectAll, selectAll, selectFirst, selectLast, selectRange, selectRest, simpleJoin, simpleSelect, singleRowSelect, toMap, union, unlockRoot
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Field Details
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row_count
protected int row_countThe number of rows in the table.
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Method Details
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getDatabase
Returns the Database object this table is part of.- Specified by:
getDatabase
in classTable
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getRootColumnScheme
Returns the SelectableScheme for the given column. This is different from 'getColumnScheme(int column)' because this is designed to be overridden so derived classes can manage their own SelectableScheme sources. -
clearColumnScheme
protected void clearColumnScheme(int column) Clears the SelectableScheme information for the given column. -
blankSelectableSchemes
protected void blankSelectableSchemes()Blanks all the column schemes in the table to an initial state. This will make all schemes of type InsertSearch.NOTE: The current default SelectableScheme type is InsertSearch. We may want to make this variable.
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blankSelectableSchemes
protected void blankSelectableSchemes(int type) Blanks all the column schemes in this table to a specific type of scheme. If Type = 0 then InsertSearch (fast but takes up memory - requires each insert and delete from the table to be logged). If type = 1 then BlindSearch (slower but uses no memory and doesn't require insert and delete to be logged). -
getColumnCount
public int getColumnCount()Returns the number of columns in the table.- Specified by:
getColumnCount
in classTable
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getRowCount
public int getRowCount()Returns the number of rows stored in the table.- Specified by:
getRowCount
in interfaceTableDataSource
- Specified by:
getRowCount
in classTable
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getResolvedVariable
Returns a fully qualified Variable object that represents the name of the column at the given index. For example, new Variable(new TableName("APP", "CUSTOMER"), "ID")- Specified by:
getResolvedVariable
in classTable
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findFieldName
Given a fully qualified variable field name, ie. 'APP.CUSTOMER.CUSTOMERID' this will return the column number the field is at. Returns -1 if the field does not exist in the table.- Specified by:
findFieldName
in classTable
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