Class AlterTable


  • public class AlterTable
    extends Statement
    Logic for the ALTER TABLE SQL statement.
    • Field Detail

      • create_statement

        StatementTree create_statement
        The create statement that we use to alter the current table. This is only for compatibility reasons.
      • table_name

        java.lang.String table_name
        The name of the table we are altering.
      • actions

        private java.util.ArrayList actions
        The list of actions to perform in this alter statement.
      • tname

        private TableName tname
        The TableName object.
      • create_stmt

        CreateTable create_stmt
        The prepared create table statement.
    • Constructor Detail

      • AlterTable

        public AlterTable()
    • Method Detail

      • addAction

        public void addAction​(AlterTableAction action)
        Adds an action to perform in this alter statement.
      • checkColumnNamesMatch

        public boolean checkColumnNamesMatch​(DatabaseConnection db,
                                             java.lang.String col1,
                                             java.lang.String col2)
        Returns true if the column names match. If the database is in case insensitive mode then the columns will match if the case insensitive search matches.
      • checkColumnConstraint

        private void checkColumnConstraint​(java.lang.String col_name,
                                           java.lang.String[] cols,
                                           TableName table,
                                           java.lang.String constraint_name)
      • prepare

        public void prepare()
                     throws DatabaseException
        Description copied from class: Statement
        Prepares the statement with the given Database object. This is called before the statement is evaluated. The prepare statement queries the database and resolves information about the statement (for example, it resolves column names and aliases and determines the tables that are touched by this statement so we can lock the appropriate tables before we evaluate).

        NOTE: Care must be taken to ensure that all methods called here are safe in as far as modifications to the data occuring. The rules for safety should be as follows. If the database is in EXCLUSIVE mode, then we need to wait until it's switched back to SHARED mode before this method is called. All collection of information done here should not involve any table state info. except for column count, column names, column types, etc. Queries such as obtaining the row count, selectable scheme information, and certainly 'getCellContents' must never be called during prepare. When prepare finishes, the affected tables are locked and the query is safe to 'evaluate' at which time table state is safe to inspect.

        Specified by:
        prepare in class Statement
        Throws:
        DatabaseException