AddUniqueConstraintCommand (Atlassian Confluence 8.0.0 API)

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 Summary
  
  Constructors
  Constructor Description
  
  AddUniqueConstraintCommand(String constraintName, Collection<String> columns)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  String getCommandName()
  
  String getCommandParameters()
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AddUniqueConstraintCommand
```
public AddUniqueConstraintCommand(String constraintName,
                                  Collection<String> columns)
```
- Method Detail
  - 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"