Package org.jdbi.v3.core.mapper

Interface ColumnMapper<T>

Type Parameters:

T - The mapped type

All Known Implementing Classes:

DateTimeMapper, EnumMapper, HStoreColumnMapper

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface ColumnMapper<T>

Maps result set columns to objects.

See Also:

• ColumnMapperFactory
• ColumnMappers
• ResultBearing.map(ColumnMapper)
• Configurable.registerColumnMapper(ColumnMapper)
• Configurable.registerColumnMapper(java.lang.reflect.Type, ColumnMapper)
• StatementContext.findColumnMapperFor(java.lang.reflect.Type)

Method Summary

Modifier and Type	Method	Description
static <U> ColumnMapper<U>	getDefaultColumnMapper()
default void	init(ConfigRegistry registry)	Allows for initialization of the column mapper instance within a ConfigRegistry scope.
T	map(ResultSet r, int columnNumber, StatementContext ctx)	Map the given column of the current row of the result set to an Object.
default T	map(ResultSet r, String columnLabel, StatementContext ctx)	Map the given column of the current row of the result set to an Object.

Method Details

getDefaultColumnMapper

static <U> ColumnMapper<U> getDefaultColumnMapper()

map

T map(ResultSet r,
 int columnNumber,
 StatementContext ctx)
throws SQLException

Map the given column of the current row of the result set to an Object. This method should not cause the result set to advance; allow Jdbi to do that, please.

Parameters:

r - the result set being iterated

columnNumber - the column number to map (starts at 1)

ctx - the statement context

Returns:

the value to return for this column

Throws:

SQLException - if anything goes wrong go ahead and let this percolate; Jdbi will handle it

map

default T map(ResultSet r,
 String columnLabel,
 StatementContext ctx)
       throws SQLException

Map the given column of the current row of the result set to an Object. This method should not cause the result set to advance; allow Jdbi to do that, please.

Parameters:

r - the result set being iterated

columnLabel - the column label to map

ctx - the statement context

Returns:

the value to return for this column

Throws:

SQLException - if anything goes wrong go ahead and let this percolate; Jdbi will handle it

init

default void init(ConfigRegistry registry)

Allows for initialization of the column mapper instance within a ConfigRegistry scope. This method is called once when the column mapper is first used from a ConfigRegistry.

Note that handles, statements, sql objects etc. all create copies of the registry, and this method will be called for every copy

Parameters:

registry - A reference to the ConfigRegistry that this instance belongs to.