```
public class GeoPkgSchemaExtension
extends GeoPkgExtension
```
The geopackage schema extension, allowing to declare more information about columns and eventually express constraints on them

Field Summary
- Fields inherited from class GeoPkgExtension
  definition, geoPackage, name, scope

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addConstraint(Connection cx, DataColumnConstraint constraint)`
`void`	`addConstraint(DataColumnConstraint constraint)`
`void`	`addDataColumn(String tableName, DataColumn dataColumn)`
`DataColumnConstraint`	`getConstraint(String contraintName)`	Returns the constraint by name, or sets to null if missing
`List<DataColumn>`	`getDataColumns(String tableName)`

public GeoPkgSchemaExtension(GeoPackage geoPackage)

public List<DataColumn> getDataColumns(String tableName)
                                throws IOException

public DataColumnConstraint getConstraint(String contraintName)
                                   throws IOException

Returns the constraint by name, or sets to null if missing

public void addDataColumn(String tableName,
                          DataColumn dataColumn)
                   throws IOException

public void addConstraint(DataColumnConstraint constraint)
                   throws SQLException

public void addConstraint(Connection cx,
                          DataColumnConstraint constraint)
                   throws SQLException

Class GeoPkgSchemaExtension