org.mybatis.dynamic.sql.select

Interface SelectDSLCompleter

All Superinterfaces:

Function<QueryExpressionDSL<SelectModel>,Buildable<SelectModel>>

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 SelectDSLCompleter
extends Function<QueryExpressionDSL<SelectModel>,Buildable<SelectModel>>

Represents a function that can be used to create a general select method. When using this function, you can create a method that does not require a user to call the build() and render() methods - making client code look a bit cleaner.

This function is intended to by used in conjunction with utility methods like the select methods in MyBatis3Utils.

For example, you can create mapper interface methods like this:

 @SelectProvider(type=SqlProviderAdapter.class, method="select")
 List<PersonRecord> selectMany(SelectStatementProvider selectStatement);
   
 BasicColumn[] selectList =
     BasicColumn.columnList(id, firstName, lastName, birthDate, employed, occupation, addressId);
 
 default List<PersonRecord> select(SelectDSLCompleter completer) {
      return MyBatis3Utils.select(this::selectMany, selectList, person, completer);
 }
 

And then call the simplified default method like this:

 List<PersonRecord> rows = mapper.select(c ->
         c.where(occupation, isNull()));
 

You can implement a "select all" with the following code:

 List<PersonRecord> rows = mapper.select(c -> c);
 

Or

 List<PersonRecord> rows = mapper.select(SelectDSLCompleter.allRows());
 

There is also a utility method to support selecting all rows in a specified order:

 List<PersonRecord> rows = mapper.select(SelectDSLCompleter.allRowsOrderedBy(lastName, firstName));
 

Author:

Jeff Butler

Method Summary

Modifier and Type	Method and Description
static SelectDSLCompleter	allRows() Returns a completer that can be used to select every row in a table.
static SelectDSLCompleter	allRowsOrderedBy(SortSpecification... columns) Returns a completer that can be used to select every row in a table with specified order.

Methods inherited from interface java.util.function.Function

andThen, apply, compose, identity

Method Detail

allRows

static SelectDSLCompleter allRows()

Returns a completer that can be used to select every row in a table.

Returns:

the completer that will select every row in a table

allRowsOrderedBy

static SelectDSLCompleter allRowsOrderedBy(SortSpecification... columns)

Returns a completer that can be used to select every row in a table with specified order.

Parameters:

columns - list of sort specifications for an order by clause

Returns:

the completer that will select every row in a table with specified order