Package com.atlassian.confluence.upgrade.ddl

Class AddUniqueConstraintCommand

java.lang.Object
com.atlassian.confluence.upgrade.ddl.AddUniqueConstraintCommand
All Implemented Interfaces:
AlterTableCommand
public class AddUniqueConstraintCommand extends Object implements AlterTableCommand
Represents a unique constraint on a set of columns. Beware columns that allow null values! On SQL Server and Oracle, nulls are distinct values (and so constraints over them will prevent two rows containing nulls in those columns). On MySQL nulls will cause the constraint to be ignored, no matter the values in any other constrained columns. On DB2, nullable columns cannot have unique constraints at all.

  • Constructor Details

    • AddUniqueConstraintCommand

      public AddUniqueConstraintCommand(String constraintName, Collection<String> columns)

  • Method Details

    • getCommandName

      public String getCommandName()
      Specified by:
      getCommandName in interface AlterTableCommand
      Returns:
      The keyword/name of the current command for the current database (e.g. altering a column is "alter column" on PostgreSQL and "modify" on MySQL.

    • getCommandParameters

      public String getCommandParameters()
      Specified by:
      getCommandParameters in interface AlterTableCommand
      Returns:
      The part that comes after the command name. E.g. "colname set not null" which would be after "alter column colname set not null"