Class RowData

java.lang.Object
com.mckoi.database.RowData
All Implemented Interfaces:
Types

public class RowData extends Object implements Types
Represents a row of data to be added into a table. The row data is linked to a TableField that describes the cell information within a row.

There are two types of RowData object. Those that are empty and contain blank data, and those that contain information to either be inserted into a table, or has be retrieved from a row.

NOTE: Any RowData objects that need to be set to 'null' should be done so explicitly. NOTE: We must call a 'setColumnData' method for _every_ column in the row to form. NOTE: This method (or derived classes) must only use safe methods in DataTable. (ie. getRowCount, etc are out).

Author:
Tobias Downer
  • Constructor Details

    • RowData

      public RowData(TransactionSystem system, int col_count)
      To create a RowData object without an underlying table. This is for copying from one table to a different one.
    • RowData

      public RowData(TableDataSource table)
      The Constructor generates a blank row.
  • Method Details

    • setColumnData

      public void setColumnData(int column, TObject cell)
      Sets up a column by casting the value from the given TObject to a type that is compatible with the column. This is useful when we are copying information from one table to another.
    • setColumnDataFromObject

      public void setColumnDataFromObject(int column, Object ob)
      Sets up a column from an Object.
    • setColumnDataFromTObject

      public void setColumnDataFromTObject(int column, TObject ob)
      Sets up a column from a TObject.
    • setColumnToNull

      public void setColumnToNull(int column)
      This is a special case situation for setting the column cell to 'null'.
    • setColumnToDefault

      public void setColumnToDefault(int column, QueryContext context)
      Sets the given column number to the default value for this column.
    • getCellData

      public TObject getCellData(int column)
      Returns the TObject that represents the information in the given column of the row.
    • getColumnName

      public String getColumnName(int column)
      Returns the name of the given column number.
    • findFieldName

      public int findFieldName(String column_name)
      Finds the field in this RowData with the given name.
    • getColumnCount

      public int getColumnCount()
      Returns the number of columns (cells) in this row.
    • setDefaultForRest

      public void setDefaultForRest(QueryContext context) throws DatabaseException
      Any columns in the row of data that haven't been set yet (they will be 'null') will be set to the default value during this method. This should be called after the row data has initially been set with values from some source.
      Throws:
      DatabaseException
    • setupEntire

      public void setupEntire(Assignment[] assignments, QueryContext context) throws DatabaseException
      Sets up an entire row given the array of assignments. If any columns are left 'null' then they are filled with the default value.
      Throws:
      DatabaseException
    • setupEntire

      public void setupEntire(int[] col_indices, List insert_elements, QueryContext context) throws DatabaseException
      Sets up an entire row given the list of insert elements and a list of indices to the columns to set. An insert element is either an expression that is resolved to a constant, or the string "DEFAULT" which indicates the value should be set to the default value of the column.
      Throws:
      DatabaseException
    • setupEntire

      public void setupEntire(int[] col_indices, Expression[] exps, QueryContext context) throws DatabaseException
      Sets up an entire row given the array of Expressions and a list of indices to the columns to set. Any columns that are not set by this method are set to the default value as defined for the column.
      Throws:
      DatabaseException
    • toString

      public String toString()
      Returns a string representation of this row.
      Overrides:
      toString in class Object